# Runnables > langchain_classic → Runnables !!! danger "langchain-classic documentation" These docs cover the `langchain-classic` package. This package will be maintained for security vulnerabilities [until December 2026](https://docs.langchain.com/oss/python/release-policy). Users are encouraged to migrate to the [`langchain`](https://pypi.org/project/langchain/) package for the latest features and improvements. [See docs for `langchain`](https://reference.langchain.com/python/langchain/langchain) ## Classes - [`ModelLaboratory`](https://reference.langchain.com/python/langchain-classic/model_laboratory/ModelLaboratory) - [`BaseMemory`](https://reference.langchain.com/python/langchain-classic/base_memory/BaseMemory) - [`EvaluatorType`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType) - [`LLMEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/LLMEvalChain) - [`StringEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/StringEvaluator) - [`PairwiseStringEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/PairwiseStringEvaluator) - [`AgentTrajectoryEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/AgentTrajectoryEvaluator) - [`PairwiseStringResultOutputParser`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/PairwiseStringResultOutputParser) - [`PairwiseStringEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/PairwiseStringEvalChain) - [`LabeledPairwiseStringEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/LabeledPairwiseStringEvalChain) - [`ExactMatchStringEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base/ExactMatchStringEvaluator) - [`RegexMatchStringEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/regex_match/base/RegexMatchStringEvaluator) - [`EmbeddingDistance`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistance) - [`EmbeddingDistanceEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistanceEvalChain) - [`PairwiseEmbeddingDistanceEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/PairwiseEmbeddingDistanceEvalChain) - [`TrajectoryEval`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEval) - [`TrajectoryOutputParser`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryOutputParser) - [`TrajectoryEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain) - [`Criteria`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria) - [`CriteriaResultOutputParser`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaResultOutputParser) - [`CriteriaEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaEvalChain) - [`LabeledCriteriaEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/LabeledCriteriaEvalChain) - [`QAEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/QAEvalChain) - [`ContextQAEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/ContextQAEvalChain) - [`CotQAEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/CotQAEvalChain) - [`QAGenerateChain`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/generate_chain/QAGenerateChain) - [`ScoreStringResultOutputParser`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringResultOutputParser) - [`ScoreStringEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain) - [`LabeledScoreStringEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/LabeledScoreStringEvalChain) - [`StringDistance`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistance) - [`StringDistanceEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistanceEvalChain) - [`PairwiseStringDistanceEvalChain`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/PairwiseStringDistanceEvalChain) - [`JsonValidityEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonValidityEvaluator) - [`JsonEqualityEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonEqualityEvaluator) - [`JsonEditDistanceEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_distance/JsonEditDistanceEvaluator) - [`JsonSchemaEvaluator`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_schema/JsonSchemaEvaluator) - [`BasePromptSelector`](https://reference.langchain.com/python/langchain-classic/chains/prompt_selector/BasePromptSelector) - [`ConditionalPromptSelector`](https://reference.langchain.com/python/langchain-classic/chains/prompt_selector/ConditionalPromptSelector) - [`Chain`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain) - [`TransformChain`](https://reference.langchain.com/python/langchain-classic/chains/transform/TransformChain) - [`SequentialChain`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain) - [`SimpleSequentialChain`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SimpleSequentialChain) - [`MapReduceChain`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce/MapReduceChain) - [`OpenAIModerationChain`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain) - [`LLMChain`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain) - [`ElementInViewPort`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort) - [`Crawler`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/Crawler) - [`NatBotChain`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain) - [`ConstitutionalChain`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base/ConstitutionalChain) - [`ConstitutionalPrinciple`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/models/ConstitutionalPrinciple) - [`LLMMathChain`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain) - [`FactWithEvidence`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match/FactWithEvidence) - [`QuestionAnswer`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match/QuestionAnswer) - [`AnswerWithSources`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/qa_with_structure/AnswerWithSources) - [`SimpleRequestChain`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi/SimpleRequestChain) - [`APIChain`](https://reference.langchain.com/python/langchain-classic/chains/api/base/APIChain) - [`RefineDocumentsChain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain) - [`CombineDocsProtocol`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/CombineDocsProtocol) - [`AsyncCombineDocsProtocol`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/AsyncCombineDocsProtocol) - [`ReduceDocumentsChain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/ReduceDocumentsChain) - [`MapRerankDocumentsChain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain) - [`StuffDocumentsChain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff/StuffDocumentsChain) - [`BaseCombineDocumentsChain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/BaseCombineDocumentsChain) - [`AnalyzeDocumentChain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/AnalyzeDocumentChain) - [`MapReduceDocumentsChain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain) - [`HypotheticalDocumentEmbedder`](https://reference.langchain.com/python/langchain-classic/chains/hyde/base/HypotheticalDocumentEmbedder) - [`QAGenerationChain`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base/QAGenerationChain) - [`LLMSummarizationCheckerChain`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain) - [`FinishedOutputParser`](https://reference.langchain.com/python/langchain-classic/chains/flare/prompts/FinishedOutputParser) - [`QuestionGeneratorChain`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/QuestionGeneratorChain) - [`FlareChain`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain) - [`LoadingCallable`](https://reference.langchain.com/python/langchain-classic/chains/summarize/chain/LoadingCallable) - [`InputType`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/InputType) - [`BaseConversationalRetrievalChain`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain) - [`ConversationalRetrievalChain`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ConversationalRetrievalChain) - [`ChatVectorDBChain`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ChatVectorDBChain) - [`AttributeInfo`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/schema/AttributeInfo) - [`ISO8601Date`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/ISO8601Date) - [`ISO8601DateTime`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/ISO8601DateTime) - [`QueryTransformer`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/QueryTransformer) - [`StructuredQueryOutputParser`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/base/StructuredQueryOutputParser) - [`MultiRetrievalQAChain`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_retrieval_qa/MultiRetrievalQAChain) - [`Route`](https://reference.langchain.com/python/langchain-classic/chains/router/base/Route) - [`RouterChain`](https://reference.langchain.com/python/langchain-classic/chains/router/base/RouterChain) - [`MultiRouteChain`](https://reference.langchain.com/python/langchain-classic/chains/router/base/MultiRouteChain) - [`LLMRouterChain`](https://reference.langchain.com/python/langchain-classic/chains/router/llm_router/LLMRouterChain) - [`RouterOutputParser`](https://reference.langchain.com/python/langchain-classic/chains/router/llm_router/RouterOutputParser) - [`EmbeddingRouterChain`](https://reference.langchain.com/python/langchain-classic/chains/router/embedding_router/EmbeddingRouterChain) - [`MultiPromptChain`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_prompt/MultiPromptChain) - [`LLMCheckerChain`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain) - [`BaseRetrievalQA`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/BaseRetrievalQA) - [`RetrievalQA`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/RetrievalQA) - [`VectorDBQA`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/VectorDBQA) - [`VectorDBQAWithSourcesChain`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/vector_db/VectorDBQAWithSourcesChain) - [`LoadingCallable`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/loading/LoadingCallable) - [`BaseQAWithSourcesChain`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain) - [`QAWithSourcesChain`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/QAWithSourcesChain) - [`RetrievalQAWithSourcesChain`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/retrieval/RetrievalQAWithSourcesChain) - [`ConversationChain`](https://reference.langchain.com/python/langchain-classic/chains/conversation/base/ConversationChain) - [`LoadingCallable`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/chain/LoadingCallable) - [`ElasticsearchDatabaseChain`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain) - [`SQLInput`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/query/SQLInput) - [`SQLInputWithTables`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/query/SQLInputWithTables) - [`AgentScratchPadChatPromptTemplate`](https://reference.langchain.com/python/langchain-classic/agents/schema/AgentScratchPadChatPromptTemplate) - [`InvalidTool`](https://reference.langchain.com/python/langchain-classic/agents/tools/InvalidTool) - [`AgentExecutorIterator`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator) - [`BaseSingleActionAgent`](https://reference.langchain.com/python/langchain-classic/agents/agent/BaseSingleActionAgent) - [`BaseMultiActionAgent`](https://reference.langchain.com/python/langchain-classic/agents/agent/BaseMultiActionAgent) - [`AgentOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/agent/AgentOutputParser) - [`MultiActionAgentOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/agent/MultiActionAgentOutputParser) - [`RunnableAgent`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgent) - [`RunnableMultiActionAgent`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableMultiActionAgent) - [`LLMSingleActionAgent`](https://reference.langchain.com/python/langchain-classic/agents/agent/LLMSingleActionAgent) - [`Agent`](https://reference.langchain.com/python/langchain-classic/agents/agent/Agent) - [`ExceptionTool`](https://reference.langchain.com/python/langchain-classic/agents/agent/ExceptionTool) - [`AgentExecutor`](https://reference.langchain.com/python/langchain-classic/agents/agent/AgentExecutor) - [`AgentType`](https://reference.langchain.com/python/langchain-classic/agents/agent_types/AgentType) - [`OpenAIAssistantFinish`](https://reference.langchain.com/python/langchain-classic/agents/openai_assistant/base/OpenAIAssistantFinish) - [`OpenAIAssistantAction`](https://reference.langchain.com/python/langchain-classic/agents/openai_assistant/base/OpenAIAssistantAction) - [`OpenAIAssistantRunnable`](https://reference.langchain.com/python/langchain-classic/agents/openai_assistant/base/OpenAIAssistantRunnable) - [`StructuredChatOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/structured_chat/output_parser/StructuredChatOutputParser) - [`StructuredChatOutputParserWithRetries`](https://reference.langchain.com/python/langchain-classic/agents/structured_chat/output_parser/StructuredChatOutputParserWithRetries) - [`StructuredChatAgent`](https://reference.langchain.com/python/langchain-classic/agents/structured_chat/base/StructuredChatAgent) - [`AgentTokenBufferMemory`](https://reference.langchain.com/python/langchain-classic/agents/openai_functions_agent/agent_token_buffer_memory/AgentTokenBufferMemory) - [`OpenAIFunctionsAgent`](https://reference.langchain.com/python/langchain-classic/agents/openai_functions_agent/base/OpenAIFunctionsAgent) - [`MRKLOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/mrkl/output_parser/MRKLOutputParser) - [`ChainConfig`](https://reference.langchain.com/python/langchain-classic/agents/mrkl/base/ChainConfig) - [`ZeroShotAgent`](https://reference.langchain.com/python/langchain-classic/agents/mrkl/base/ZeroShotAgent) - [`MRKLChain`](https://reference.langchain.com/python/langchain-classic/agents/mrkl/base/MRKLChain) - [`ConvoOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/conversational/output_parser/ConvoOutputParser) - [`ConversationalAgent`](https://reference.langchain.com/python/langchain-classic/agents/conversational/base/ConversationalAgent) - [`ChatOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/chat/output_parser/ChatOutputParser) - [`ChatAgent`](https://reference.langchain.com/python/langchain-classic/agents/chat/base/ChatAgent) - [`XMLAgent`](https://reference.langchain.com/python/langchain-classic/agents/xml/base/XMLAgent) - [`OpenAIMultiFunctionsAgent`](https://reference.langchain.com/python/langchain-classic/agents/openai_functions_multi_agent/base/OpenAIMultiFunctionsAgent) - [`ConvoOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/conversational_chat/output_parser/ConvoOutputParser) - [`ConversationalChatAgent`](https://reference.langchain.com/python/langchain-classic/agents/conversational_chat/base/ConversationalChatAgent) - [`VectorStoreInfo`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/vectorstore/toolkit/VectorStoreInfo) - [`VectorStoreToolkit`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/vectorstore/toolkit/VectorStoreToolkit) - [`VectorStoreRouterToolkit`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/vectorstore/toolkit/VectorStoreRouterToolkit) - [`SelfAskWithSearchAgent`](https://reference.langchain.com/python/langchain-classic/agents/self_ask_with_search/base/SelfAskWithSearchAgent) - [`SelfAskWithSearchChain`](https://reference.langchain.com/python/langchain-classic/agents/self_ask_with_search/base/SelfAskWithSearchChain) - [`ReActSingleInputOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/react_single_input/ReActSingleInputOutputParser) - [`ToolAgentAction`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/tools/ToolAgentAction) - [`ToolsAgentOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/tools/ToolsAgentOutputParser) - [`SelfAskOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/self_ask/SelfAskOutputParser) - [`JSONAgentOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/json/JSONAgentOutputParser) - [`ReActJsonSingleInputOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/react_json_single_input/ReActJsonSingleInputOutputParser) - [`OpenAIFunctionsAgentOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/openai_functions/OpenAIFunctionsAgentOutputParser) - [`OpenAIToolsAgentOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/openai_tools/OpenAIToolsAgentOutputParser) - [`XMLAgentOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/xml/XMLAgentOutputParser) - [`ReActOutputParser`](https://reference.langchain.com/python/langchain-classic/agents/react/output_parser/ReActOutputParser) - [`ReActDocstoreAgent`](https://reference.langchain.com/python/langchain-classic/agents/react/base/ReActDocstoreAgent) - [`DocstoreExplorer`](https://reference.langchain.com/python/langchain-classic/agents/react/base/DocstoreExplorer) - [`ReActTextWorldAgent`](https://reference.langchain.com/python/langchain-classic/agents/react/base/ReActTextWorldAgent) - [`ReActChain`](https://reference.langchain.com/python/langchain-classic/agents/react/base/ReActChain) - [`StringRunMapper`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunMapper) - [`LLMStringRunMapper`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/LLMStringRunMapper) - [`ChainStringRunMapper`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/ChainStringRunMapper) - [`ToolStringRunMapper`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/ToolStringRunMapper) - [`StringExampleMapper`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringExampleMapper) - [`StringRunEvaluatorChain`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunEvaluatorChain) - [`InputFormatError`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/InputFormatError) - [`TestResult`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/TestResult) - [`EvalError`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/EvalError) - [`ChatModelInput`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/ChatModelInput) - [`EvalConfig`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/EvalConfig) - [`SingleKeyEvalConfig`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/SingleKeyEvalConfig) - [`RunEvalConfig`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig) - [`Criteria`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/Criteria) - [`LabeledCriteria`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/LabeledCriteria) - [`EmbeddingDistance`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/EmbeddingDistance) - [`StringDistance`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/StringDistance) - [`QA`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/QA) - [`ContextQA`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ContextQA) - [`CoTQA`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/CoTQA) - [`JsonValidity`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/JsonValidity) - [`JsonEqualityEvaluator`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/JsonEqualityEvaluator) - [`ExactMatch`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ExactMatch) - [`RegexMatch`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/RegexMatch) - [`ScoreString`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ScoreString) - [`LabeledScoreString`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/LabeledScoreString) - [`ProgressBarCallback`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/progress/ProgressBarCallback) - [`EncoderBackedStore`](https://reference.langchain.com/python/langchain-classic/storage/encoder_backed/EncoderBackedStore) - [`LocalFileStore`](https://reference.langchain.com/python/langchain-classic/storage/file_system/LocalFileStore) - [`LineListOutputParser`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/LineListOutputParser) - [`MultiQueryRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever) - [`MergerRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/merger_retriever/MergerRetriever) - [`TimeWeightedVectorStoreRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever) - [`EnsembleRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/EnsembleRetriever) - [`SearchType`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/SearchType) - [`MultiVectorRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/MultiVectorRetriever) - [`ParentDocumentRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/parent_document_retriever/ParentDocumentRetriever) - [`RePhraseQueryRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/re_phraser/RePhraseQueryRetriever) - [`ContextualCompressionRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/contextual_compression/ContextualCompressionRetriever) - [`SelfQueryRetriever`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever) - [`CohereRerank`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cohere_rerank/CohereRerank) - [`CrossEncoderReranker`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cross_encoder_rerank/CrossEncoderReranker) - [`LLMChainFilter`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/LLMChainFilter) - [`NoOutputParser`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_extract/NoOutputParser) - [`LLMChainExtractor`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_extract/LLMChainExtractor) - [`LLMListwiseRerank`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/listwise_rerank/LLMListwiseRerank) - [`DocumentCompressorPipeline`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/base/DocumentCompressorPipeline) - [`EmbeddingsFilter`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/embeddings_filter/EmbeddingsFilter) - [`AsyncIteratorCallbackHandler`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_aiter/AsyncIteratorCallbackHandler) - [`FinalStreamingStdOutCallbackHandler`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_stdout_final_only/FinalStreamingStdOutCallbackHandler) - [`AsyncFinalIteratorCallbackHandler`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_aiter_final_only/AsyncFinalIteratorCallbackHandler) - [`LoggingCallbackHandler`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/logging/LoggingCallbackHandler) - [`OpenAIFunction`](https://reference.langchain.com/python/langchain-classic/runnables/openai_functions/OpenAIFunction) - [`OpenAIFunctionsRouter`](https://reference.langchain.com/python/langchain-classic/runnables/openai_functions/OpenAIFunctionsRouter) - [`HubRunnable`](https://reference.langchain.com/python/langchain-classic/runnables/hub/HubRunnable) - [`CacheBackedEmbeddings`](https://reference.langchain.com/python/langchain-classic/embeddings/cache/CacheBackedEmbeddings) - [`SummarizerMixin`](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin) - [`ConversationSummaryMemory`](https://reference.langchain.com/python/langchain-classic/memory/summary/ConversationSummaryMemory) - [`ReadOnlySharedMemory`](https://reference.langchain.com/python/langchain-classic/memory/readonly/ReadOnlySharedMemory) - [`ConversationVectorStoreTokenBufferMemory`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory/ConversationVectorStoreTokenBufferMemory) - [`ConversationBufferMemory`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationBufferMemory) - [`ConversationStringBufferMemory`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationStringBufferMemory) - [`SimpleMemory`](https://reference.langchain.com/python/langchain-classic/memory/simple/SimpleMemory) - [`VectorStoreRetrieverMemory`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore/VectorStoreRetrieverMemory) - [`ConversationBufferWindowMemory`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory) - [`BaseEntityStore`](https://reference.langchain.com/python/langchain-classic/memory/entity/BaseEntityStore) - [`InMemoryEntityStore`](https://reference.langchain.com/python/langchain-classic/memory/entity/InMemoryEntityStore) - [`UpstashRedisEntityStore`](https://reference.langchain.com/python/langchain-classic/memory/entity/UpstashRedisEntityStore) - [`RedisEntityStore`](https://reference.langchain.com/python/langchain-classic/memory/entity/RedisEntityStore) - [`SQLiteEntityStore`](https://reference.langchain.com/python/langchain-classic/memory/entity/SQLiteEntityStore) - [`ConversationEntityMemory`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory) - [`ConversationSummaryBufferMemory`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory) - [`BaseChatMemory`](https://reference.langchain.com/python/langchain-classic/memory/chat_memory/BaseChatMemory) - [`ConversationTokenBufferMemory`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory) - [`CombinedMemory`](https://reference.langchain.com/python/langchain-classic/memory/combined/CombinedMemory) - [`VectorStoreIndexWrapper`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorStoreIndexWrapper) - [`VectorstoreIndexCreator`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorstoreIndexCreator) - [`UpsertionRecord`](https://reference.langchain.com/python/langchain-classic/indexes/_sql_record_manager/UpsertionRecord) - [`SQLRecordManager`](https://reference.langchain.com/python/langchain-classic/indexes/_sql_record_manager/SQLRecordManager) - [`PandasDataFrameOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/pandas_dataframe/PandasDataFrameOutputParser) - [`YamlOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/yaml/YamlOutputParser) - [`EnumOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/enum/EnumOutputParser) - [`RetryOutputParserRetryChainInput`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParserRetryChainInput) - [`RetryWithErrorOutputParserRetryChainInput`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParserRetryChainInput) - [`RetryOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParser) - [`RetryWithErrorOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParser) - [`ResponseSchema`](https://reference.langchain.com/python/langchain-classic/output_parsers/structured/ResponseSchema) - [`StructuredOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/structured/StructuredOutputParser) - [`DatetimeOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/datetime/DatetimeOutputParser) - [`RegexDictParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/regex_dict/RegexDictParser) - [`CombiningOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/combining/CombiningOutputParser) - [`OutputFixingParserRetryChainInput`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParserRetryChainInput) - [`OutputFixingParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParser) - [`RegexParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/regex/RegexParser) - [`BooleanOutputParser`](https://reference.langchain.com/python/langchain-classic/output_parsers/boolean/BooleanOutputParser) ## Functions - [`get_runtime_environment()`](https://reference.langchain.com/python/langchain-classic/env/get_runtime_environment) - [`push()`](https://reference.langchain.com/python/langchain-classic/hub/push) - [`pull()`](https://reference.langchain.com/python/langchain-classic/hub/pull) - [`get_pydantic_major_version()`](https://reference.langchain.com/python/langchain-classic/utils/pydantic/get_pydantic_major_version) - [`load_dataset()`](https://reference.langchain.com/python/langchain-classic/evaluation/loading/load_dataset) - [`load_evaluator()`](https://reference.langchain.com/python/langchain-classic/evaluation/loading/load_evaluator) - [`load_evaluators()`](https://reference.langchain.com/python/langchain-classic/evaluation/loading/load_evaluators) - [`resolve_pairwise_criteria()`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/resolve_pairwise_criteria) - [`resolve_criteria()`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/resolve_criteria) - [`resolve_criteria()`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/resolve_criteria) - [`is_llm()`](https://reference.langchain.com/python/langchain-classic/chains/prompt_selector/is_llm) - [`is_chat_model()`](https://reference.langchain.com/python/langchain-classic/chains/prompt_selector/is_chat_model) - [`load_llm()`](https://reference.langchain.com/python/langchain-classic/chains/loading/load_llm) - [`load_llm_from_config()`](https://reference.langchain.com/python/langchain-classic/chains/loading/load_llm_from_config) - [`load_chain_from_config()`](https://reference.langchain.com/python/langchain-classic/chains/loading/load_chain_from_config) - [`load_chain()`](https://reference.langchain.com/python/langchain-classic/chains/loading/load_chain) - [`generate_example()`](https://reference.langchain.com/python/langchain-classic/chains/example_generator/generate_example) - [`create_history_aware_retriever()`](https://reference.langchain.com/python/langchain-classic/chains/history_aware_retriever/create_history_aware_retriever) - [`create_retrieval_chain()`](https://reference.langchain.com/python/langchain-classic/chains/retrieval/create_retrieval_chain) - [`get_llm_kwargs()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/utils/get_llm_kwargs) - [`create_openai_fn_chain()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/base/create_openai_fn_chain) - [`create_structured_output_chain()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/base/create_structured_output_chain) - [`create_citation_fuzzy_match_runnable()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match/create_citation_fuzzy_match_runnable) - [`create_citation_fuzzy_match_chain()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match/create_citation_fuzzy_match_chain) - [`create_tagging_chain()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/tagging/create_tagging_chain) - [`create_tagging_chain_pydantic()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/tagging/create_tagging_chain_pydantic) - [`create_qa_with_structure_chain()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/qa_with_structure/create_qa_with_structure_chain) - [`create_qa_with_sources_chain()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/qa_with_structure/create_qa_with_sources_chain) - [`create_extraction_chain()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/extraction/create_extraction_chain) - [`create_extraction_chain_pydantic()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/extraction/create_extraction_chain_pydantic) - [`openapi_spec_to_openai_fn()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi/openapi_spec_to_openai_fn) - [`get_openapi_chain()`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi/get_openapi_chain) - [`split_list_of_docs()`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/split_list_of_docs) - [`collapse_docs()`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/collapse_docs) - [`acollapse_docs()`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/acollapse_docs) - [`create_stuff_documents_chain()`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff/create_stuff_documents_chain) - [`create_openai_fn_runnable()`](https://reference.langchain.com/python/langchain-classic/chains/structured_output/base/create_openai_fn_runnable) - [`create_structured_output_runnable()`](https://reference.langchain.com/python/langchain-classic/chains/structured_output/base/create_structured_output_runnable) - [`get_openai_output_parser()`](https://reference.langchain.com/python/langchain-classic/chains/structured_output/base/get_openai_output_parser) - [`load_summarize_chain()`](https://reference.langchain.com/python/langchain-classic/chains/summarize/chain/load_summarize_chain) - [`v_args()`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/v_args) - [`get_parser()`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/get_parser) - [`fix_filter_directive()`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/base/fix_filter_directive) - [`construct_examples()`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/base/construct_examples) - [`get_query_constructor_prompt()`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/base/get_query_constructor_prompt) - [`load_query_constructor_chain()`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/base/load_query_constructor_chain) - [`load_query_constructor_runnable()`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/base/load_query_constructor_runnable) - [`load_qa_with_sources_chain()`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/loading/load_qa_with_sources_chain) - [`load_qa_chain()`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/chain/load_qa_chain) - [`create_extraction_chain_pydantic()`](https://reference.langchain.com/python/langchain-classic/chains/openai_tools/extraction/create_extraction_chain_pydantic) - [`create_sql_query_chain()`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/query/create_sql_query_chain) - [`load_agent_from_config()`](https://reference.langchain.com/python/langchain-classic/agents/loading/load_agent_from_config) - [`load_agent()`](https://reference.langchain.com/python/langchain-classic/agents/loading/load_agent) - [`validate_tools_single_input()`](https://reference.langchain.com/python/langchain-classic/agents/utils/validate_tools_single_input) - [`initialize_agent()`](https://reference.langchain.com/python/langchain-classic/agents/initialize/initialize_agent) - [`create_tool_calling_agent()`](https://reference.langchain.com/python/langchain-classic/agents/tool_calling_agent/base/create_tool_calling_agent) - [`create_structured_chat_agent()`](https://reference.langchain.com/python/langchain-classic/agents/structured_chat/base/create_structured_chat_agent) - [`create_openai_functions_agent()`](https://reference.langchain.com/python/langchain-classic/agents/openai_functions_agent/base/create_openai_functions_agent) - [`format_to_tool_messages()`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/tools/format_to_tool_messages) - [`format_to_openai_function_messages()`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/openai_functions/format_to_openai_function_messages) - [`format_log_to_messages()`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/log_to_messages/format_log_to_messages) - [`format_xml()`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/xml/format_xml) - [`format_log_to_str()`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/log/format_log_to_str) - [`create_json_chat_agent()`](https://reference.langchain.com/python/langchain-classic/agents/json_chat/base/create_json_chat_agent) - [`create_xml_agent()`](https://reference.langchain.com/python/langchain-classic/agents/xml/base/create_xml_agent) - [`create_vectorstore_agent()`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/vectorstore/base/create_vectorstore_agent) - [`create_vectorstore_router_agent()`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/vectorstore/base/create_vectorstore_router_agent) - [`create_conversational_retrieval_agent()`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/conversational_retrieval/openai_functions/create_conversational_retrieval_agent) - [`create_self_ask_with_search_agent()`](https://reference.langchain.com/python/langchain-classic/agents/self_ask_with_search/base/create_self_ask_with_search_agent) - [`parse_ai_message_to_tool_action()`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/tools/parse_ai_message_to_tool_action) - [`parse_ai_message_to_openai_tool_action()`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/openai_tools/parse_ai_message_to_openai_tool_action) - [`create_openai_tools_agent()`](https://reference.langchain.com/python/langchain-classic/agents/openai_tools/base/create_openai_tools_agent) - [`create_react_agent()`](https://reference.langchain.com/python/langchain-classic/agents/react/agent/create_react_agent) - [`random_name()`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/name_generation/random_name) - [`arun_on_dataset()`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/arun_on_dataset) - [`run_on_dataset()`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/run_on_dataset) - [`create_lc_store()`](https://reference.langchain.com/python/langchain-classic/storage/_lc_store/create_lc_store) - [`create_kv_docstore()`](https://reference.langchain.com/python/langchain-classic/storage/_lc_store/create_kv_docstore) - [`unique_by_key()`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/unique_by_key) - [`default_get_input()`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/default_get_input) - [`default_get_input()`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_extract/default_get_input) - [`create_importer()`](https://reference.langchain.com/python/langchain-classic/_api/module_import/create_importer) - [`is_interactive_env()`](https://reference.langchain.com/python/langchain-classic/_api/interactive_env/is_interactive_env) - [`get_type_to_cls_dict()`](https://reference.langchain.com/python/langchain-classic/llms/get_type_to_cls_dict) - [`callback()`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/logging/LoggingCallbackHandler/__init__/callback) - [`StreamlitCallbackHandler()`](https://reference.langchain.com/python/langchain-classic/callbacks/streamlit/StreamlitCallbackHandler) - [`init_embeddings()`](https://reference.langchain.com/python/langchain-classic/embeddings/base/init_embeddings) - [`init_chat_model()`](https://reference.langchain.com/python/langchain-classic/chat_models/base/init_chat_model) - [`get_prompt_input_key()`](https://reference.langchain.com/python/langchain-classic/memory/utils/get_prompt_input_key) - [`load_output_parser()`](https://reference.langchain.com/python/langchain-classic/output_parsers/loading/load_output_parser) ## Modules - [`langchain_classic`](https://reference.langchain.com/python/langchain-classic/langchain_classic) - [`text_splitter`](https://reference.langchain.com/python/langchain-classic/text_splitter) - [`env`](https://reference.langchain.com/python/langchain-classic/env) - [`sql_database`](https://reference.langchain.com/python/langchain-classic/sql_database) - [`formatting`](https://reference.langchain.com/python/langchain-classic/formatting) - [`example_generator`](https://reference.langchain.com/python/langchain-classic/example_generator) - [`python`](https://reference.langchain.com/python/langchain-classic/python) - [`base_language`](https://reference.langchain.com/python/langchain-classic/base_language) - [`model_laboratory`](https://reference.langchain.com/python/langchain-classic/model_laboratory) - [`cache`](https://reference.langchain.com/python/langchain-classic/cache) - [`serpapi`](https://reference.langchain.com/python/langchain-classic/serpapi) - [`globals`](https://reference.langchain.com/python/langchain-classic/globals) - [`base_memory`](https://reference.langchain.com/python/langchain-classic/base_memory) - [`hub`](https://reference.langchain.com/python/langchain-classic/hub) - [`input`](https://reference.langchain.com/python/langchain-classic/input) - [`requests`](https://reference.langchain.com/python/langchain-classic/requests) - [`utils`](https://reference.langchain.com/python/langchain-classic/utils) - [`ernie_functions`](https://reference.langchain.com/python/langchain-classic/utils/ernie_functions) - [`env`](https://reference.langchain.com/python/langchain-classic/utils/env) - [`math`](https://reference.langchain.com/python/langchain-classic/utils/math) - [`html`](https://reference.langchain.com/python/langchain-classic/utils/html) - [`iter`](https://reference.langchain.com/python/langchain-classic/utils/iter) - [`utils`](https://reference.langchain.com/python/langchain-classic/utils/utils) - [`formatting`](https://reference.langchain.com/python/langchain-classic/utils/formatting) - [`strings`](https://reference.langchain.com/python/langchain-classic/utils/strings) - [`pydantic`](https://reference.langchain.com/python/langchain-classic/utils/pydantic) - [`openai`](https://reference.langchain.com/python/langchain-classic/utils/openai) - [`openai_functions`](https://reference.langchain.com/python/langchain-classic/utils/openai_functions) - [`input`](https://reference.langchain.com/python/langchain-classic/utils/input) - [`aiter`](https://reference.langchain.com/python/langchain-classic/utils/aiter) - [`json_schema`](https://reference.langchain.com/python/langchain-classic/utils/json_schema) - [`evaluation`](https://reference.langchain.com/python/langchain-classic/evaluation) - [`schema`](https://reference.langchain.com/python/langchain-classic/evaluation/schema) - [`loading`](https://reference.langchain.com/python/langchain-classic/evaluation/loading) - [`comparison`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison) - [`eval_chain`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain) - [`prompt`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/prompt) - [`exact_match`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match) - [`base`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base) - [`regex_match`](https://reference.langchain.com/python/langchain-classic/evaluation/regex_match) - [`base`](https://reference.langchain.com/python/langchain-classic/evaluation/regex_match/base) - [`embedding_distance`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance) - [`base`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base) - [`agents`](https://reference.langchain.com/python/langchain-classic/evaluation/agents) - [`trajectory_eval_chain`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain) - [`trajectory_eval_prompt`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_prompt) - [`criteria`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria) - [`eval_chain`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain) - [`prompt`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/prompt) - [`qa`](https://reference.langchain.com/python/langchain-classic/evaluation/qa) - [`generate_prompt`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/generate_prompt) - [`eval_chain`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain) - [`generate_chain`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/generate_chain) - [`eval_prompt`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_prompt) - [`scoring`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring) - [`eval_chain`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain) - [`prompt`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/prompt) - [`string_distance`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance) - [`base`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base) - [`parsing`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing) - [`base`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base) - [`json_distance`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_distance) - [`json_schema`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_schema) - [`chat_loaders`](https://reference.langchain.com/python/langchain-classic/chat_loaders) - [`telegram`](https://reference.langchain.com/python/langchain-classic/chat_loaders/telegram) - [`imessage`](https://reference.langchain.com/python/langchain-classic/chat_loaders/imessage) - [`utils`](https://reference.langchain.com/python/langchain-classic/chat_loaders/utils) - [`base`](https://reference.langchain.com/python/langchain-classic/chat_loaders/base) - [`gmail`](https://reference.langchain.com/python/langchain-classic/chat_loaders/gmail) - [`whatsapp`](https://reference.langchain.com/python/langchain-classic/chat_loaders/whatsapp) - [`facebook_messenger`](https://reference.langchain.com/python/langchain-classic/chat_loaders/facebook_messenger) - [`langsmith`](https://reference.langchain.com/python/langchain-classic/chat_loaders/langsmith) - [`slack`](https://reference.langchain.com/python/langchain-classic/chat_loaders/slack) - [`chains`](https://reference.langchain.com/python/langchain-classic/chains) - [`prompt_selector`](https://reference.langchain.com/python/langchain-classic/chains/prompt_selector) - [`loading`](https://reference.langchain.com/python/langchain-classic/chains/loading) - [`example_generator`](https://reference.langchain.com/python/langchain-classic/chains/example_generator) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/base) - [`transform`](https://reference.langchain.com/python/langchain-classic/chains/transform) - [`llm_requests`](https://reference.langchain.com/python/langchain-classic/chains/llm_requests) - [`history_aware_retriever`](https://reference.langchain.com/python/langchain-classic/chains/history_aware_retriever) - [`sequential`](https://reference.langchain.com/python/langchain-classic/chains/sequential) - [`retrieval`](https://reference.langchain.com/python/langchain-classic/chains/retrieval) - [`mapreduce`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce) - [`moderation`](https://reference.langchain.com/python/langchain-classic/chains/moderation) - [`llm`](https://reference.langchain.com/python/langchain-classic/chains/llm) - [`natbot`](https://reference.langchain.com/python/langchain-classic/chains/natbot) - [`crawler`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/natbot/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base) - [`constitutional_ai`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai) - [`principles`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/principles) - [`prompts`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/prompts) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base) - [`models`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/models) - [`llm_math`](https://reference.langchain.com/python/langchain-classic/chains/llm_math) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base) - [`ernie_functions`](https://reference.langchain.com/python/langchain-classic/chains/ernie_functions) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/ernie_functions/base) - [`openai_functions`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions) - [`utils`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/utils) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/base) - [`citation_fuzzy_match`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match) - [`tagging`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/tagging) - [`qa_with_structure`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/qa_with_structure) - [`extraction`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/extraction) - [`openapi`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi) - [`api`](https://reference.langchain.com/python/langchain-classic/chains/api) - [`open_meteo_docs`](https://reference.langchain.com/python/langchain-classic/chains/api/open_meteo_docs) - [`podcast_docs`](https://reference.langchain.com/python/langchain-classic/chains/api/podcast_docs) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/api/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/api/base) - [`news_docs`](https://reference.langchain.com/python/langchain-classic/chains/api/news_docs) - [`tmdb_docs`](https://reference.langchain.com/python/langchain-classic/chains/api/tmdb_docs) - [`openapi`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi) - [`chain`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi/chain) - [`prompts`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi/prompts) - [`requests_chain`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi/requests_chain) - [`response_chain`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi/response_chain) - [`combine_documents`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents) - [`refine`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine) - [`reduce`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce) - [`map_rerank`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank) - [`stuff`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base) - [`map_reduce`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce) - [`graph_qa`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa) - [`kuzu`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/kuzu) - [`arangodb`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/arangodb) - [`prompts`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/prompts) - [`cypher`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/cypher) - [`gremlin`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/gremlin) - [`ontotext_graphdb`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/ontotext_graphdb) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/base) - [`neptune_sparql`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/neptune_sparql) - [`nebulagraph`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/nebulagraph) - [`cypher_utils`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/cypher_utils) - [`falkordb`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/falkordb) - [`neptune_cypher`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/neptune_cypher) - [`hugegraph`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/hugegraph) - [`sparql`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/sparql) - [`structured_output`](https://reference.langchain.com/python/langchain-classic/chains/structured_output) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/structured_output/base) - [`hyde`](https://reference.langchain.com/python/langchain-classic/chains/hyde) - [`prompts`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/hyde/base) - [`chat_vector_db`](https://reference.langchain.com/python/langchain-classic/chains/chat_vector_db) - [`prompts`](https://reference.langchain.com/python/langchain-classic/chains/chat_vector_db/prompts) - [`qa_generation`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base) - [`llm_summarization_checker`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base) - [`flare`](https://reference.langchain.com/python/langchain-classic/chains/flare) - [`prompts`](https://reference.langchain.com/python/langchain-classic/chains/flare/prompts) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/flare/base) - [`llm_symbolic_math`](https://reference.langchain.com/python/langchain-classic/chains/llm_symbolic_math) - [`summarize`](https://reference.langchain.com/python/langchain-classic/chains/summarize) - [`chain`](https://reference.langchain.com/python/langchain-classic/chains/summarize/chain) - [`refine_prompts`](https://reference.langchain.com/python/langchain-classic/chains/summarize/refine_prompts) - [`stuff_prompt`](https://reference.langchain.com/python/langchain-classic/chains/summarize/stuff_prompt) - [`map_reduce_prompt`](https://reference.langchain.com/python/langchain-classic/chains/summarize/map_reduce_prompt) - [`conversational_retrieval`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval) - [`prompts`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/prompts) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base) - [`query_constructor`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor) - [`schema`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/schema) - [`parser`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser) - [`ir`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/ir) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/base) - [`router`](https://reference.langchain.com/python/langchain-classic/chains/router) - [`multi_retrieval_prompt`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_retrieval_prompt) - [`multi_retrieval_qa`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_retrieval_qa) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/router/base) - [`llm_router`](https://reference.langchain.com/python/langchain-classic/chains/router/llm_router) - [`multi_prompt_prompt`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_prompt_prompt) - [`embedding_router`](https://reference.langchain.com/python/langchain-classic/chains/router/embedding_router) - [`multi_prompt`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_prompt) - [`llm_checker`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base) - [`retrieval_qa`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base) - [`qa_with_sources`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources) - [`vector_db`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/vector_db) - [`loading`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/loading) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base) - [`refine_prompts`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/refine_prompts) - [`stuff_prompt`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/stuff_prompt) - [`retrieval`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/retrieval) - [`map_reduce_prompt`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/map_reduce_prompt) - [`conversation`](https://reference.langchain.com/python/langchain-classic/chains/conversation) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/conversation/prompt) - [`memory`](https://reference.langchain.com/python/langchain-classic/chains/conversation/memory) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/conversation/base) - [`question_answering`](https://reference.langchain.com/python/langchain-classic/chains/question_answering) - [`chain`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/chain) - [`map_rerank_prompt`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_rerank_prompt) - [`refine_prompts`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts) - [`stuff_prompt`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/stuff_prompt) - [`map_reduce_prompt`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt) - [`elasticsearch_database`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database) - [`prompts`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/prompts) - [`base`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base) - [`llm_bash`](https://reference.langchain.com/python/langchain-classic/chains/llm_bash) - [`openai_tools`](https://reference.langchain.com/python/langchain-classic/chains/openai_tools) - [`extraction`](https://reference.langchain.com/python/langchain-classic/chains/openai_tools/extraction) - [`sql_database`](https://reference.langchain.com/python/langchain-classic/chains/sql_database) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt) - [`query`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/query) - [`agents`](https://reference.langchain.com/python/langchain-classic/agents) - [`load_tools`](https://reference.langchain.com/python/langchain-classic/agents/load_tools) - [`schema`](https://reference.langchain.com/python/langchain-classic/agents/schema) - [`loading`](https://reference.langchain.com/python/langchain-classic/agents/loading) - [`utils`](https://reference.langchain.com/python/langchain-classic/agents/utils) - [`tools`](https://reference.langchain.com/python/langchain-classic/agents/tools) - [`agent_iterator`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator) - [`types`](https://reference.langchain.com/python/langchain-classic/agents/types) - [`initialize`](https://reference.langchain.com/python/langchain-classic/agents/initialize) - [`agent`](https://reference.langchain.com/python/langchain-classic/agents/agent) - [`agent_types`](https://reference.langchain.com/python/langchain-classic/agents/agent_types) - [`tool_calling_agent`](https://reference.langchain.com/python/langchain-classic/agents/tool_calling_agent) - [`base`](https://reference.langchain.com/python/langchain-classic/agents/tool_calling_agent/base) - [`openai_assistant`](https://reference.langchain.com/python/langchain-classic/agents/openai_assistant) - [`base`](https://reference.langchain.com/python/langchain-classic/agents/openai_assistant/base) - [`structured_chat`](https://reference.langchain.com/python/langchain-classic/agents/structured_chat) - [`prompt`](https://reference.langchain.com/python/langchain-classic/agents/structured_chat/prompt) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/agents/structured_chat/output_parser) - [`base`](https://reference.langchain.com/python/langchain-classic/agents/structured_chat/base) - [`openai_functions_agent`](https://reference.langchain.com/python/langchain-classic/agents/openai_functions_agent) - [`agent_token_buffer_memory`](https://reference.langchain.com/python/langchain-classic/agents/openai_functions_agent/agent_token_buffer_memory) - [`base`](https://reference.langchain.com/python/langchain-classic/agents/openai_functions_agent/base) - [`mrkl`](https://reference.langchain.com/python/langchain-classic/agents/mrkl) - [`prompt`](https://reference.langchain.com/python/langchain-classic/agents/mrkl/prompt) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/agents/mrkl/output_parser) - [`base`](https://reference.langchain.com/python/langchain-classic/agents/mrkl/base) - [`format_scratchpad`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad) - [`tools`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/tools) - [`openai_functions`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/openai_functions) - [`openai_tools`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/openai_tools) - [`log_to_messages`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/log_to_messages) - [`xml`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/xml) - [`log`](https://reference.langchain.com/python/langchain-classic/agents/format_scratchpad/log) - [`conversational`](https://reference.langchain.com/python/langchain-classic/agents/conversational) - [`prompt`](https://reference.langchain.com/python/langchain-classic/agents/conversational/prompt) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/agents/conversational/output_parser) - [`base`](https://reference.langchain.com/python/langchain-classic/agents/conversational/base) - [`chat`](https://reference.langchain.com/python/langchain-classic/agents/chat) - [`prompt`](https://reference.langchain.com/python/langchain-classic/agents/chat/prompt) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/agents/chat/output_parser) - [`base`](https://reference.langchain.com/python/langchain-classic/agents/chat/base) - [`json_chat`](https://reference.langchain.com/python/langchain-classic/agents/json_chat) - [`prompt`](https://reference.langchain.com/python/langchain-classic/agents/json_chat/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/agents/json_chat/base) - [`xml`](https://reference.langchain.com/python/langchain-classic/agents/xml) - 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[`arcee`](https://reference.langchain.com/python/langchain-classic/utilities/arcee) - [`tavily_search`](https://reference.langchain.com/python/langchain-classic/utilities/tavily_search) - [`anthropic`](https://reference.langchain.com/python/langchain-classic/utilities/anthropic) - [`scenexplain`](https://reference.langchain.com/python/langchain-classic/utilities/scenexplain) - [`graphql`](https://reference.langchain.com/python/langchain-classic/utilities/graphql) - [`pubmed`](https://reference.langchain.com/python/langchain-classic/utilities/pubmed) - [`google_finance`](https://reference.langchain.com/python/langchain-classic/utilities/google_finance) - [`google_serper`](https://reference.langchain.com/python/langchain-classic/utilities/google_serper) - [`powerbi`](https://reference.langchain.com/python/langchain-classic/utilities/powerbi) - [`duckduckgo_search`](https://reference.langchain.com/python/langchain-classic/utilities/duckduckgo_search) - [`merriam_webster`](https://reference.langchain.com/python/langchain-classic/utilities/merriam_webster) - [`reddit_search`](https://reference.langchain.com/python/langchain-classic/utilities/reddit_search) - [`vertexai`](https://reference.langchain.com/python/langchain-classic/utilities/vertexai) - [`github`](https://reference.langchain.com/python/langchain-classic/utilities/github) - [`asyncio`](https://reference.langchain.com/python/langchain-classic/utilities/asyncio) - [`sql_database`](https://reference.langchain.com/python/langchain-classic/utilities/sql_database) - [`searchapi`](https://reference.langchain.com/python/langchain-classic/utilities/searchapi) - [`outline`](https://reference.langchain.com/python/langchain-classic/utilities/outline) - [`tensorflow_datasets`](https://reference.langchain.com/python/langchain-classic/utilities/tensorflow_datasets) - [`google_trends`](https://reference.langchain.com/python/langchain-classic/utilities/google_trends) - [`metaphor_search`](https://reference.langchain.com/python/langchain-classic/utilities/metaphor_search) - [`dalle_image_generator`](https://reference.langchain.com/python/langchain-classic/utilities/dalle_image_generator) - [`openweathermap`](https://reference.langchain.com/python/langchain-classic/utilities/openweathermap) - [`dataforseo_api_search`](https://reference.langchain.com/python/langchain-classic/utilities/dataforseo_api_search) - [`zapier`](https://reference.langchain.com/python/langchain-classic/utilities/zapier) - [`python`](https://reference.langchain.com/python/langchain-classic/utilities/python) - [`brave_search`](https://reference.langchain.com/python/langchain-classic/utilities/brave_search) - [`arxiv`](https://reference.langchain.com/python/langchain-classic/utilities/arxiv) - [`max_compute`](https://reference.langchain.com/python/langchain-classic/utilities/max_compute) - [`clickup`](https://reference.langchain.com/python/langchain-classic/utilities/clickup) - [`portkey`](https://reference.langchain.com/python/langchain-classic/utilities/portkey) - [`google_jobs`](https://reference.langchain.com/python/langchain-classic/utilities/google_jobs) - [`gitlab`](https://reference.langchain.com/python/langchain-classic/utilities/gitlab) - [`google_search`](https://reference.langchain.com/python/langchain-classic/utilities/google_search) - [`apify`](https://reference.langchain.com/python/langchain-classic/utilities/apify) - [`serpapi`](https://reference.langchain.com/python/langchain-classic/utilities/serpapi) - [`wolfram_alpha`](https://reference.langchain.com/python/langchain-classic/utilities/wolfram_alpha) - [`opaqueprompts`](https://reference.langchain.com/python/langchain-classic/utilities/opaqueprompts) - [`openapi`](https://reference.langchain.com/python/langchain-classic/utilities/openapi) - [`google_places_api`](https://reference.langchain.com/python/langchain-classic/utilities/google_places_api) - [`bibtex`](https://reference.langchain.com/python/langchain-classic/utilities/bibtex) - [`steam`](https://reference.langchain.com/python/langchain-classic/utilities/steam) - [`google_scholar`](https://reference.langchain.com/python/langchain-classic/utilities/google_scholar) - [`spark_sql`](https://reference.langchain.com/python/langchain-classic/utilities/spark_sql) - [`searx_search`](https://reference.langchain.com/python/langchain-classic/utilities/searx_search) - [`twilio`](https://reference.langchain.com/python/langchain-classic/utilities/twilio) - [`requests`](https://reference.langchain.com/python/langchain-classic/utilities/requests) - [`stackexchange`](https://reference.langchain.com/python/langchain-classic/utilities/stackexchange) - [`redis`](https://reference.langchain.com/python/langchain-classic/utilities/redis) - [`alpha_vantage`](https://reference.langchain.com/python/langchain-classic/utilities/alpha_vantage) - [`jira`](https://reference.langchain.com/python/langchain-classic/utilities/jira) - [`wikipedia`](https://reference.langchain.com/python/langchain-classic/utilities/wikipedia) - [`golden_query`](https://reference.langchain.com/python/langchain-classic/utilities/golden_query) - [`nasa`](https://reference.langchain.com/python/langchain-classic/utilities/nasa) - [`path`](https://reference.langchain.com/python/langchain-classic/_api/path) - [`module_import`](https://reference.langchain.com/python/langchain-classic/_api/module_import) - [`deprecation`](https://reference.langchain.com/python/langchain-classic/_api/deprecation) - [`interactive_env`](https://reference.langchain.com/python/langchain-classic/_api/interactive_env) - [`llms`](https://reference.langchain.com/python/langchain-classic/llms) - [`yandex`](https://reference.langchain.com/python/langchain-classic/llms/yandex) - [`mlflow`](https://reference.langchain.com/python/langchain-classic/llms/mlflow) - [`edenai`](https://reference.langchain.com/python/langchain-classic/llms/edenai) - [`together`](https://reference.langchain.com/python/langchain-classic/llms/together) - [`google_palm`](https://reference.langchain.com/python/langchain-classic/llms/google_palm) - [`arcee`](https://reference.langchain.com/python/langchain-classic/llms/arcee) - [`amazon_api_gateway`](https://reference.langchain.com/python/langchain-classic/llms/amazon_api_gateway) - [`anthropic`](https://reference.langchain.com/python/langchain-classic/llms/anthropic) - [`mlflow_ai_gateway`](https://reference.langchain.com/python/langchain-classic/llms/mlflow_ai_gateway) - [`predibase`](https://reference.langchain.com/python/langchain-classic/llms/predibase) - [`writer`](https://reference.langchain.com/python/langchain-classic/llms/writer) - [`fake`](https://reference.langchain.com/python/langchain-classic/llms/fake) - [`octoai_endpoint`](https://reference.langchain.com/python/langchain-classic/llms/octoai_endpoint) - [`huggingface_endpoint`](https://reference.langchain.com/python/langchain-classic/llms/huggingface_endpoint) - [`loading`](https://reference.langchain.com/python/langchain-classic/llms/loading) - [`vertexai`](https://reference.langchain.com/python/langchain-classic/llms/vertexai) - [`forefrontai`](https://reference.langchain.com/python/langchain-classic/llms/forefrontai) - [`huggingface_text_gen_inference`](https://reference.langchain.com/python/langchain-classic/llms/huggingface_text_gen_inference) - [`pai_eas_endpoint`](https://reference.langchain.com/python/langchain-classic/llms/pai_eas_endpoint) - [`deepsparse`](https://reference.langchain.com/python/langchain-classic/llms/deepsparse) - [`chatglm`](https://reference.langchain.com/python/langchain-classic/llms/chatglm) - [`self_hosted_hugging_face`](https://reference.langchain.com/python/langchain-classic/llms/self_hosted_hugging_face) - [`tongyi`](https://reference.langchain.com/python/langchain-classic/llms/tongyi) - [`ai21`](https://reference.langchain.com/python/langchain-classic/llms/ai21) - [`manifest`](https://reference.langchain.com/python/langchain-classic/llms/manifest) - [`gooseai`](https://reference.langchain.com/python/langchain-classic/llms/gooseai) - [`utils`](https://reference.langchain.com/python/langchain-classic/llms/utils) - [`minimax`](https://reference.langchain.com/python/langchain-classic/llms/minimax) - [`textgen`](https://reference.langchain.com/python/langchain-classic/llms/textgen) - [`baseten`](https://reference.langchain.com/python/langchain-classic/llms/baseten) - [`symblai_nebula`](https://reference.langchain.com/python/langchain-classic/llms/symblai_nebula) - [`bananadev`](https://reference.langchain.com/python/langchain-classic/llms/bananadev) - [`xinference`](https://reference.langchain.com/python/langchain-classic/llms/xinference) - [`base`](https://reference.langchain.com/python/langchain-classic/llms/base) - [`volcengine_maas`](https://reference.langchain.com/python/langchain-classic/llms/volcengine_maas) - [`titan_takeoff`](https://reference.langchain.com/python/langchain-classic/llms/titan_takeoff) - [`gigachat`](https://reference.langchain.com/python/langchain-classic/llms/gigachat) - [`cohere`](https://reference.langchain.com/python/langchain-classic/llms/cohere) - [`databricks`](https://reference.langchain.com/python/langchain-classic/llms/databricks) - [`vllm`](https://reference.langchain.com/python/langchain-classic/llms/vllm) - [`watsonxllm`](https://reference.langchain.com/python/langchain-classic/llms/watsonxllm) - [`deepinfra`](https://reference.langchain.com/python/langchain-classic/llms/deepinfra) - [`petals`](https://reference.langchain.com/python/langchain-classic/llms/petals) - [`javelin_ai_gateway`](https://reference.langchain.com/python/langchain-classic/llms/javelin_ai_gateway) - [`openai`](https://reference.langchain.com/python/langchain-classic/llms/openai) - [`predictionguard`](https://reference.langchain.com/python/langchain-classic/llms/predictionguard) - [`koboldai`](https://reference.langchain.com/python/langchain-classic/llms/koboldai) - [`sagemaker_endpoint`](https://reference.langchain.com/python/langchain-classic/llms/sagemaker_endpoint) - [`ctranslate2`](https://reference.langchain.com/python/langchain-classic/llms/ctranslate2) - [`openllm`](https://reference.langchain.com/python/langchain-classic/llms/openllm) - [`llamacpp`](https://reference.langchain.com/python/langchain-classic/llms/llamacpp) - [`beam`](https://reference.langchain.com/python/langchain-classic/llms/beam) - [`opaqueprompts`](https://reference.langchain.com/python/langchain-classic/llms/opaqueprompts) - [`bittensor`](https://reference.langchain.com/python/langchain-classic/llms/bittensor) - [`fireworks`](https://reference.langchain.com/python/langchain-classic/llms/fireworks) - [`gpt4all`](https://reference.langchain.com/python/langchain-classic/llms/gpt4all) - [`replicate`](https://reference.langchain.com/python/langchain-classic/llms/replicate) - [`mosaicml`](https://reference.langchain.com/python/langchain-classic/llms/mosaicml) - [`aleph_alpha`](https://reference.langchain.com/python/langchain-classic/llms/aleph_alpha) - [`ctransformers`](https://reference.langchain.com/python/langchain-classic/llms/ctransformers) - [`pipelineai`](https://reference.langchain.com/python/langchain-classic/llms/pipelineai) - [`stochasticai`](https://reference.langchain.com/python/langchain-classic/llms/stochasticai) - [`clarifai`](https://reference.langchain.com/python/langchain-classic/llms/clarifai) - [`promptlayer_openai`](https://reference.langchain.com/python/langchain-classic/llms/promptlayer_openai) - [`huggingface_hub`](https://reference.langchain.com/python/langchain-classic/llms/huggingface_hub) - [`gradient_ai`](https://reference.langchain.com/python/langchain-classic/llms/gradient_ai) - [`anyscale`](https://reference.langchain.com/python/langchain-classic/llms/anyscale) - [`baidu_qianfan_endpoint`](https://reference.langchain.com/python/langchain-classic/llms/baidu_qianfan_endpoint) - [`rwkv`](https://reference.langchain.com/python/langchain-classic/llms/rwkv) - [`azureml_endpoint`](https://reference.langchain.com/python/langchain-classic/llms/azureml_endpoint) - [`cerebriumai`](https://reference.langchain.com/python/langchain-classic/llms/cerebriumai) - [`cloudflare_workersai`](https://reference.langchain.com/python/langchain-classic/llms/cloudflare_workersai) - [`ollama`](https://reference.langchain.com/python/langchain-classic/llms/ollama) - [`modal`](https://reference.langchain.com/python/langchain-classic/llms/modal) - [`openlm`](https://reference.langchain.com/python/langchain-classic/llms/openlm) - [`bedrock`](https://reference.langchain.com/python/langchain-classic/llms/bedrock) - [`human`](https://reference.langchain.com/python/langchain-classic/llms/human) - [`huggingface_pipeline`](https://reference.langchain.com/python/langchain-classic/llms/huggingface_pipeline) - [`self_hosted`](https://reference.langchain.com/python/langchain-classic/llms/self_hosted) - [`titan_takeoff_pro`](https://reference.langchain.com/python/langchain-classic/llms/titan_takeoff_pro) - [`nlpcloud`](https://reference.langchain.com/python/langchain-classic/llms/nlpcloud) - [`aviary`](https://reference.langchain.com/python/langchain-classic/llms/aviary) - [`schema`](https://reference.langchain.com/python/langchain-classic/schema) - [`retriever`](https://reference.langchain.com/python/langchain-classic/schema/retriever) - [`chat_history`](https://reference.langchain.com/python/langchain-classic/schema/chat_history) - [`document`](https://reference.langchain.com/python/langchain-classic/schema/document) - [`embeddings`](https://reference.langchain.com/python/langchain-classic/schema/embeddings) - [`exceptions`](https://reference.langchain.com/python/langchain-classic/schema/exceptions) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/schema/prompt_template) - [`prompt`](https://reference.langchain.com/python/langchain-classic/schema/prompt) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/schema/output_parser) - [`memory`](https://reference.langchain.com/python/langchain-classic/schema/memory) - [`output`](https://reference.langchain.com/python/langchain-classic/schema/output) - [`cache`](https://reference.langchain.com/python/langchain-classic/schema/cache) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/schema/vectorstore) - [`storage`](https://reference.langchain.com/python/langchain-classic/schema/storage) - [`chat`](https://reference.langchain.com/python/langchain-classic/schema/chat) - [`language_model`](https://reference.langchain.com/python/langchain-classic/schema/language_model) - [`agent`](https://reference.langchain.com/python/langchain-classic/schema/agent) - [`messages`](https://reference.langchain.com/python/langchain-classic/schema/messages) - [`runnable`](https://reference.langchain.com/python/langchain-classic/schema/runnable) - [`branch`](https://reference.langchain.com/python/langchain-classic/schema/runnable/branch) - [`passthrough`](https://reference.langchain.com/python/langchain-classic/schema/runnable/passthrough) - [`configurable`](https://reference.langchain.com/python/langchain-classic/schema/runnable/configurable) - [`router`](https://reference.langchain.com/python/langchain-classic/schema/runnable/router) - [`utils`](https://reference.langchain.com/python/langchain-classic/schema/runnable/utils) - [`base`](https://reference.langchain.com/python/langchain-classic/schema/runnable/base) - [`retry`](https://reference.langchain.com/python/langchain-classic/schema/runnable/retry) - [`fallbacks`](https://reference.langchain.com/python/langchain-classic/schema/runnable/fallbacks) - [`config`](https://reference.langchain.com/python/langchain-classic/schema/runnable/config) - [`history`](https://reference.langchain.com/python/langchain-classic/schema/runnable/history) - [`callbacks`](https://reference.langchain.com/python/langchain-classic/schema/callbacks) - [`base`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/base) - [`manager`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/manager) - [`streaming_stdout`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/streaming_stdout) - [`stdout`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/stdout) - [`tracers`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers) - [`root_listeners`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers/root_listeners) - [`base`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers/base) - [`schemas`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers/schemas) - [`log_stream`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers/log_stream) - [`run_collector`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers/run_collector) - [`langchain`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers/langchain) - [`evaluation`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers/evaluation) - [`stdout`](https://reference.langchain.com/python/langchain-classic/schema/callbacks/tracers/stdout) - [`callbacks`](https://reference.langchain.com/python/langchain-classic/callbacks) - [`streaming_aiter`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_aiter) - [`clearml_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/clearml_callback) - [`openai_info`](https://reference.langchain.com/python/langchain-classic/callbacks/openai_info) - [`labelstudio_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/labelstudio_callback) - [`argilla_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/argilla_callback) - [`wandb_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/wandb_callback) - [`arthur_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/arthur_callback) - [`infino_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/infino_callback) - [`utils`](https://reference.langchain.com/python/langchain-classic/callbacks/utils) - [`streaming_stdout_final_only`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_stdout_final_only) - [`base`](https://reference.langchain.com/python/langchain-classic/callbacks/base) - [`manager`](https://reference.langchain.com/python/langchain-classic/callbacks/manager) - [`aim_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/aim_callback) - [`promptlayer_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/promptlayer_callback) - [`mlflow_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/mlflow_callback) - [`flyte_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/flyte_callback) - [`streaming_aiter_final_only`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_aiter_final_only) - [`whylabs_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/whylabs_callback) - [`arize_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/arize_callback) - [`llmonitor_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/llmonitor_callback) - [`context_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/context_callback) - [`streaming_stdout`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_stdout) - [`sagemaker_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/sagemaker_callback) - [`file`](https://reference.langchain.com/python/langchain-classic/callbacks/file) - [`human`](https://reference.langchain.com/python/langchain-classic/callbacks/human) - [`stdout`](https://reference.langchain.com/python/langchain-classic/callbacks/stdout) - [`trubrics_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/trubrics_callback) - [`comet_ml_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/comet_ml_callback) - [`confident_callback`](https://reference.langchain.com/python/langchain-classic/callbacks/confident_callback) - [`tracers`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers) - [`root_listeners`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/root_listeners) - [`wandb`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/wandb) - [`comet`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/comet) - [`base`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/base) - [`schemas`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/schemas) - [`log_stream`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/log_stream) - [`run_collector`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/run_collector) - [`logging`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/logging) - [`langchain`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/langchain) - [`evaluation`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/evaluation) - [`stdout`](https://reference.langchain.com/python/langchain-classic/callbacks/tracers/stdout) - [`streamlit`](https://reference.langchain.com/python/langchain-classic/callbacks/streamlit) - [`mutable_expander`](https://reference.langchain.com/python/langchain-classic/callbacks/streamlit/mutable_expander) - [`streamlit_callback_handler`](https://reference.langchain.com/python/langchain-classic/callbacks/streamlit/streamlit_callback_handler) - [`prompts`](https://reference.langchain.com/python/langchain-classic/prompts) - [`few_shot`](https://reference.langchain.com/python/langchain-classic/prompts/few_shot) - [`loading`](https://reference.langchain.com/python/langchain-classic/prompts/loading) - [`prompt`](https://reference.langchain.com/python/langchain-classic/prompts/prompt) - [`base`](https://reference.langchain.com/python/langchain-classic/prompts/base) - [`few_shot_with_templates`](https://reference.langchain.com/python/langchain-classic/prompts/few_shot_with_templates) - [`chat`](https://reference.langchain.com/python/langchain-classic/prompts/chat) - [`example_selector`](https://reference.langchain.com/python/langchain-classic/prompts/example_selector) - [`ngram_overlap`](https://reference.langchain.com/python/langchain-classic/prompts/example_selector/ngram_overlap) - [`base`](https://reference.langchain.com/python/langchain-classic/prompts/example_selector/base) - [`semantic_similarity`](https://reference.langchain.com/python/langchain-classic/prompts/example_selector/semantic_similarity) - [`length_based`](https://reference.langchain.com/python/langchain-classic/prompts/example_selector/length_based) - [`runnables`](https://reference.langchain.com/python/langchain-classic/runnables) - [`openai_functions`](https://reference.langchain.com/python/langchain-classic/runnables/openai_functions) - [`hub`](https://reference.langchain.com/python/langchain-classic/runnables/hub) - [`document_loaders`](https://reference.langchain.com/python/langchain-classic/document_loaders) - [`rocksetdb`](https://reference.langchain.com/python/langchain-classic/document_loaders/rocksetdb) - [`pdf`](https://reference.langchain.com/python/langchain-classic/document_loaders/pdf) - [`recursive_url_loader`](https://reference.langchain.com/python/langchain-classic/document_loaders/recursive_url_loader) - [`telegram`](https://reference.langchain.com/python/langchain-classic/document_loaders/telegram) - [`s3_directory`](https://reference.langchain.com/python/langchain-classic/document_loaders/s3_directory) - [`baiducloud_bos_directory`](https://reference.langchain.com/python/langchain-classic/document_loaders/baiducloud_bos_directory) - [`notiondb`](https://reference.langchain.com/python/langchain-classic/document_loaders/notiondb) - [`etherscan`](https://reference.langchain.com/python/langchain-classic/document_loaders/etherscan) - [`hn`](https://reference.langchain.com/python/langchain-classic/document_loaders/hn) - [`merge`](https://reference.langchain.com/python/langchain-classic/document_loaders/merge) - [`azure_ai_data`](https://reference.langchain.com/python/langchain-classic/document_loaders/azure_ai_data) - [`imsdb`](https://reference.langchain.com/python/langchain-classic/document_loaders/imsdb) - [`blackboard`](https://reference.langchain.com/python/langchain-classic/document_loaders/blackboard) - [`mongodb`](https://reference.langchain.com/python/langchain-classic/document_loaders/mongodb) - [`airbyte_json`](https://reference.langchain.com/python/langchain-classic/document_loaders/airbyte_json) - [`quip`](https://reference.langchain.com/python/langchain-classic/document_loaders/quip) - [`git`](https://reference.langchain.com/python/langchain-classic/document_loaders/git) - [`pubmed`](https://reference.langchain.com/python/langchain-classic/document_loaders/pubmed) - [`web_base`](https://reference.langchain.com/python/langchain-classic/document_loaders/web_base) - [`onedrive_file`](https://reference.langchain.com/python/langchain-classic/document_loaders/onedrive_file) - [`figma`](https://reference.langchain.com/python/langchain-classic/document_loaders/figma) - [`s3_file`](https://reference.langchain.com/python/langchain-classic/document_loaders/s3_file) - [`fauna`](https://reference.langchain.com/python/langchain-classic/document_loaders/fauna) - [`arcgis_loader`](https://reference.langchain.com/python/langchain-classic/document_loaders/arcgis_loader) - [`conllu`](https://reference.langchain.com/python/langchain-classic/document_loaders/conllu) - [`html`](https://reference.langchain.com/python/langchain-classic/document_loaders/html) - [`sharepoint`](https://reference.langchain.com/python/langchain-classic/document_loaders/sharepoint) - [`rtf`](https://reference.langchain.com/python/langchain-classic/document_loaders/rtf) - [`evernote`](https://reference.langchain.com/python/langchain-classic/document_loaders/evernote) - [`college_confidential`](https://reference.langchain.com/python/langchain-classic/document_loaders/college_confidential) - [`github`](https://reference.langchain.com/python/langchain-classic/document_loaders/github) - [`joplin`](https://reference.langchain.com/python/langchain-classic/document_loaders/joplin) - [`html_bs`](https://reference.langchain.com/python/langchain-classic/document_loaders/html_bs) - [`nuclia`](https://reference.langchain.com/python/langchain-classic/document_loaders/nuclia) - [`polars_dataframe`](https://reference.langchain.com/python/langchain-classic/document_loaders/polars_dataframe) - [`notebook`](https://reference.langchain.com/python/langchain-classic/document_loaders/notebook) - [`lakefs`](https://reference.langchain.com/python/langchain-classic/document_loaders/lakefs) - [`mhtml`](https://reference.langchain.com/python/langchain-classic/document_loaders/mhtml) - [`azure_blob_storage_file`](https://reference.langchain.com/python/langchain-classic/document_loaders/azure_blob_storage_file) - [`apify_dataset`](https://reference.langchain.com/python/langchain-classic/document_loaders/apify_dataset) - [`helpers`](https://reference.langchain.com/python/langchain-classic/document_loaders/helpers) - [`tensorflow_datasets`](https://reference.langchain.com/python/langchain-classic/document_loaders/tensorflow_datasets) - [`url`](https://reference.langchain.com/python/langchain-classic/document_loaders/url) - [`browserless`](https://reference.langchain.com/python/langchain-classic/document_loaders/browserless) - [`tencent_cos_file`](https://reference.langchain.com/python/langchain-classic/document_loaders/tencent_cos_file) - [`org_mode`](https://reference.langchain.com/python/langchain-classic/document_loaders/org_mode) - [`ifixit`](https://reference.langchain.com/python/langchain-classic/document_loaders/ifixit) - [`discord`](https://reference.langchain.com/python/langchain-classic/document_loaders/discord) - [`cube_semantic`](https://reference.langchain.com/python/langchain-classic/document_loaders/cube_semantic) - [`airbyte`](https://reference.langchain.com/python/langchain-classic/document_loaders/airbyte) - [`obsidian`](https://reference.langchain.com/python/langchain-classic/document_loaders/obsidian) - [`epub`](https://reference.langchain.com/python/langchain-classic/document_loaders/epub) - [`dataframe`](https://reference.langchain.com/python/langchain-classic/document_loaders/dataframe) - [`sitemap`](https://reference.langchain.com/python/langchain-classic/document_loaders/sitemap) - [`csv_loader`](https://reference.langchain.com/python/langchain-classic/document_loaders/csv_loader) - [`word_document`](https://reference.langchain.com/python/langchain-classic/document_loaders/word_document) - [`pyspark_dataframe`](https://reference.langchain.com/python/langchain-classic/document_loaders/pyspark_dataframe) - [`weather`](https://reference.langchain.com/python/langchain-classic/document_loaders/weather) - [`roam`](https://reference.langchain.com/python/langchain-classic/document_loaders/roam) - [`gcs_directory`](https://reference.langchain.com/python/langchain-classic/document_loaders/gcs_directory) - [`couchbase`](https://reference.langchain.com/python/langchain-classic/document_loaders/couchbase) - [`powerpoint`](https://reference.langchain.com/python/langchain-classic/document_loaders/powerpoint) - [`python`](https://reference.langchain.com/python/langchain-classic/document_loaders/python) - [`bilibili`](https://reference.langchain.com/python/langchain-classic/document_loaders/bilibili) - [`brave_search`](https://reference.langchain.com/python/langchain-classic/document_loaders/brave_search) - [`base`](https://reference.langchain.com/python/langchain-classic/document_loaders/base) - [`geodataframe`](https://reference.langchain.com/python/langchain-classic/document_loaders/geodataframe) - [`url_playwright`](https://reference.langchain.com/python/langchain-classic/document_loaders/url_playwright) - [`arxiv`](https://reference.langchain.com/python/langchain-classic/document_loaders/arxiv) - [`docugami`](https://reference.langchain.com/python/langchain-classic/document_loaders/docugami) - [`email`](https://reference.langchain.com/python/langchain-classic/document_loaders/email) - [`reddit`](https://reference.langchain.com/python/langchain-classic/document_loaders/reddit) - [`blockchain`](https://reference.langchain.com/python/langchain-classic/document_loaders/blockchain) - [`hugging_face_dataset`](https://reference.langchain.com/python/langchain-classic/document_loaders/hugging_face_dataset) - [`iugu`](https://reference.langchain.com/python/langchain-classic/document_loaders/iugu) - [`psychic`](https://reference.langchain.com/python/langchain-classic/document_loaders/psychic) - [`max_compute`](https://reference.langchain.com/python/langchain-classic/document_loaders/max_compute) - [`toml`](https://reference.langchain.com/python/langchain-classic/document_loaders/toml) - [`confluence`](https://reference.langchain.com/python/langchain-classic/document_loaders/confluence) - [`rss`](https://reference.langchain.com/python/langchain-classic/document_loaders/rss) - [`unstructured`](https://reference.langchain.com/python/langchain-classic/document_loaders/unstructured) - [`acreom`](https://reference.langchain.com/python/langchain-classic/document_loaders/acreom) - [`async_html`](https://reference.langchain.com/python/langchain-classic/document_loaders/async_html) - [`obs_directory`](https://reference.langchain.com/python/langchain-classic/document_loaders/obs_directory) - [`tsv`](https://reference.langchain.com/python/langchain-classic/document_loaders/tsv) - [`whatsapp_chat`](https://reference.langchain.com/python/langchain-classic/document_loaders/whatsapp_chat) - [`obs_file`](https://reference.langchain.com/python/langchain-classic/document_loaders/obs_file) - [`airtable`](https://reference.langchain.com/python/langchain-classic/document_loaders/airtable) - [`googledrive`](https://reference.langchain.com/python/langchain-classic/document_loaders/googledrive) - [`chromium`](https://reference.langchain.com/python/langchain-classic/document_loaders/chromium) - [`twitter`](https://reference.langchain.com/python/langchain-classic/document_loaders/twitter) - [`facebook_chat`](https://reference.langchain.com/python/langchain-classic/document_loaders/facebook_chat) - [`image_captions`](https://reference.langchain.com/python/langchain-classic/document_loaders/image_captions) - [`url_selenium`](https://reference.langchain.com/python/langchain-classic/document_loaders/url_selenium) - [`onedrive`](https://reference.langchain.com/python/langchain-classic/document_loaders/onedrive) - [`modern_treasury`](https://reference.langchain.com/python/langchain-classic/document_loaders/modern_treasury) - [`gcs_file`](https://reference.langchain.com/python/langchain-classic/document_loaders/gcs_file) - [`larksuite`](https://reference.langchain.com/python/langchain-classic/document_loaders/larksuite) - [`assemblyai`](https://reference.langchain.com/python/langchain-classic/document_loaders/assemblyai) - [`text`](https://reference.langchain.com/python/langchain-classic/document_loaders/text) - [`slack_directory`](https://reference.langchain.com/python/langchain-classic/document_loaders/slack_directory) - [`markdown`](https://reference.langchain.com/python/langchain-classic/document_loaders/markdown) - [`notion`](https://reference.langchain.com/python/langchain-classic/document_loaders/notion) - [`gitbook`](https://reference.langchain.com/python/langchain-classic/document_loaders/gitbook) - [`tomarkdown`](https://reference.langchain.com/python/langchain-classic/document_loaders/tomarkdown) - [`srt`](https://reference.langchain.com/python/langchain-classic/document_loaders/srt) - [`open_city_data`](https://reference.langchain.com/python/langchain-classic/document_loaders/open_city_data) - [`xorbits`](https://reference.langchain.com/python/langchain-classic/document_loaders/xorbits) - [`bibtex`](https://reference.langchain.com/python/langchain-classic/document_loaders/bibtex) - [`concurrent`](https://reference.langchain.com/python/langchain-classic/document_loaders/concurrent) - [`mediawikidump`](https://reference.langchain.com/python/langchain-classic/document_loaders/mediawikidump) - [`docusaurus`](https://reference.langchain.com/python/langchain-classic/document_loaders/docusaurus) - [`dropbox`](https://reference.langchain.com/python/langchain-classic/document_loaders/dropbox) - [`diffbot`](https://reference.langchain.com/python/langchain-classic/document_loaders/diffbot) - [`generic`](https://reference.langchain.com/python/langchain-classic/document_loaders/generic) - [`gutenberg`](https://reference.langchain.com/python/langchain-classic/document_loaders/gutenberg) - [`rst`](https://reference.langchain.com/python/langchain-classic/document_loaders/rst) - [`image`](https://reference.langchain.com/python/langchain-classic/document_loaders/image) - [`azlyrics`](https://reference.langchain.com/python/langchain-classic/document_loaders/azlyrics) - [`mastodon`](https://reference.langchain.com/python/langchain-classic/document_loaders/mastodon) - [`spreedly`](https://reference.langchain.com/python/langchain-classic/document_loaders/spreedly) - [`stripe`](https://reference.langchain.com/python/langchain-classic/document_loaders/stripe) - [`xml`](https://reference.langchain.com/python/langchain-classic/document_loaders/xml) - [`google_speech_to_text`](https://reference.langchain.com/python/langchain-classic/document_loaders/google_speech_to_text) - [`json_loader`](https://reference.langchain.com/python/langchain-classic/document_loaders/json_loader) - [`trello`](https://reference.langchain.com/python/langchain-classic/document_loaders/trello) - [`snowflake_loader`](https://reference.langchain.com/python/langchain-classic/document_loaders/snowflake_loader) - [`directory`](https://reference.langchain.com/python/langchain-classic/document_loaders/directory) - [`excel`](https://reference.langchain.com/python/langchain-classic/document_loaders/excel) - [`news`](https://reference.langchain.com/python/langchain-classic/document_loaders/news) - [`readthedocs`](https://reference.langchain.com/python/langchain-classic/document_loaders/readthedocs) - [`wikipedia`](https://reference.langchain.com/python/langchain-classic/document_loaders/wikipedia) - [`duckdb_loader`](https://reference.langchain.com/python/langchain-classic/document_loaders/duckdb_loader) - [`azure_blob_storage_container`](https://reference.langchain.com/python/langchain-classic/document_loaders/azure_blob_storage_container) - [`odt`](https://reference.langchain.com/python/langchain-classic/document_loaders/odt) - [`chatgpt`](https://reference.langchain.com/python/langchain-classic/document_loaders/chatgpt) - [`bigquery`](https://reference.langchain.com/python/langchain-classic/document_loaders/bigquery) - [`baiducloud_bos_file`](https://reference.langchain.com/python/langchain-classic/document_loaders/baiducloud_bos_file) - [`datadog_logs`](https://reference.langchain.com/python/langchain-classic/document_loaders/datadog_logs) - [`base_o365`](https://reference.langchain.com/python/langchain-classic/document_loaders/base_o365) - [`onenote`](https://reference.langchain.com/python/langchain-classic/document_loaders/onenote) - [`youtube`](https://reference.langchain.com/python/langchain-classic/document_loaders/youtube) - [`tencent_cos_directory`](https://reference.langchain.com/python/langchain-classic/document_loaders/tencent_cos_directory) - [`rspace`](https://reference.langchain.com/python/langchain-classic/document_loaders/rspace) - [`parsers`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers) - [`pdf`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/pdf) - [`msword`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/msword) - [`docai`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/docai) - [`audio`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/audio) - [`registry`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/registry) - [`txt`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/txt) - [`generic`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/generic) - [`grobid`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/grobid) - [`html`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/html) - [`bs4`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/html/bs4) - [`language`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/language) - [`javascript`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/language/javascript) - [`code_segmenter`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/language/code_segmenter) - [`python`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/language/python) - [`cobol`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/language/cobol) - [`language_parser`](https://reference.langchain.com/python/langchain-classic/document_loaders/parsers/language/language_parser) - [`blob_loaders`](https://reference.langchain.com/python/langchain-classic/document_loaders/blob_loaders) - [`schema`](https://reference.langchain.com/python/langchain-classic/document_loaders/blob_loaders/schema) - [`youtube_audio`](https://reference.langchain.com/python/langchain-classic/document_loaders/blob_loaders/youtube_audio) - [`file_system`](https://reference.langchain.com/python/langchain-classic/document_loaders/blob_loaders/file_system) - [`embeddings`](https://reference.langchain.com/python/langchain-classic/embeddings) - [`mlflow`](https://reference.langchain.com/python/langchain-classic/embeddings/mlflow) - [`edenai`](https://reference.langchain.com/python/langchain-classic/embeddings/edenai) - [`google_palm`](https://reference.langchain.com/python/langchain-classic/embeddings/google_palm) - [`fake`](https://reference.langchain.com/python/langchain-classic/embeddings/fake) - [`tensorflow_hub`](https://reference.langchain.com/python/langchain-classic/embeddings/tensorflow_hub) - [`spacy_embeddings`](https://reference.langchain.com/python/langchain-classic/embeddings/spacy_embeddings) - [`vertexai`](https://reference.langchain.com/python/langchain-classic/embeddings/vertexai) - [`modelscope_hub`](https://reference.langchain.com/python/langchain-classic/embeddings/modelscope_hub) - [`self_hosted_hugging_face`](https://reference.langchain.com/python/langchain-classic/embeddings/self_hosted_hugging_face) - [`minimax`](https://reference.langchain.com/python/langchain-classic/embeddings/minimax) - [`xinference`](https://reference.langchain.com/python/langchain-classic/embeddings/xinference) - [`base`](https://reference.langchain.com/python/langchain-classic/embeddings/base) - [`awa`](https://reference.langchain.com/python/langchain-classic/embeddings/awa) - [`elasticsearch`](https://reference.langchain.com/python/langchain-classic/embeddings/elasticsearch) - [`azure_openai`](https://reference.langchain.com/python/langchain-classic/embeddings/azure_openai) - [`huggingface`](https://reference.langchain.com/python/langchain-classic/embeddings/huggingface) - [`cohere`](https://reference.langchain.com/python/langchain-classic/embeddings/cohere) - [`cache`](https://reference.langchain.com/python/langchain-classic/embeddings/cache) - [`llm_rails`](https://reference.langchain.com/python/langchain-classic/embeddings/llm_rails) - [`mlflow_gateway`](https://reference.langchain.com/python/langchain-classic/embeddings/mlflow_gateway) - [`databricks`](https://reference.langchain.com/python/langchain-classic/embeddings/databricks) - [`deepinfra`](https://reference.langchain.com/python/langchain-classic/embeddings/deepinfra) - [`javelin_ai_gateway`](https://reference.langchain.com/python/langchain-classic/embeddings/javelin_ai_gateway) - [`bookend`](https://reference.langchain.com/python/langchain-classic/embeddings/bookend) - [`openai`](https://reference.langchain.com/python/langchain-classic/embeddings/openai) - [`jina`](https://reference.langchain.com/python/langchain-classic/embeddings/jina) - [`octoai_embeddings`](https://reference.langchain.com/python/langchain-classic/embeddings/octoai_embeddings) - [`sagemaker_endpoint`](https://reference.langchain.com/python/langchain-classic/embeddings/sagemaker_endpoint) - [`llamacpp`](https://reference.langchain.com/python/langchain-classic/embeddings/llamacpp) - [`voyageai`](https://reference.langchain.com/python/langchain-classic/embeddings/voyageai) - [`johnsnowlabs`](https://reference.langchain.com/python/langchain-classic/embeddings/johnsnowlabs) - [`gpt4all`](https://reference.langchain.com/python/langchain-classic/embeddings/gpt4all) - [`mosaicml`](https://reference.langchain.com/python/langchain-classic/embeddings/mosaicml) - [`localai`](https://reference.langchain.com/python/langchain-classic/embeddings/localai) - [`aleph_alpha`](https://reference.langchain.com/python/langchain-classic/embeddings/aleph_alpha) - [`infinity`](https://reference.langchain.com/python/langchain-classic/embeddings/infinity) - [`ernie`](https://reference.langchain.com/python/langchain-classic/embeddings/ernie) - [`fastembed`](https://reference.langchain.com/python/langchain-classic/embeddings/fastembed) - [`clarifai`](https://reference.langchain.com/python/langchain-classic/embeddings/clarifai) - [`dashscope`](https://reference.langchain.com/python/langchain-classic/embeddings/dashscope) - [`huggingface_hub`](https://reference.langchain.com/python/langchain-classic/embeddings/huggingface_hub) - [`gradient_ai`](https://reference.langchain.com/python/langchain-classic/embeddings/gradient_ai) - [`baidu_qianfan_endpoint`](https://reference.langchain.com/python/langchain-classic/embeddings/baidu_qianfan_endpoint) - [`cloudflare_workersai`](https://reference.langchain.com/python/langchain-classic/embeddings/cloudflare_workersai) - [`ollama`](https://reference.langchain.com/python/langchain-classic/embeddings/ollama) - [`bedrock`](https://reference.langchain.com/python/langchain-classic/embeddings/bedrock) - [`sentence_transformer`](https://reference.langchain.com/python/langchain-classic/embeddings/sentence_transformer) - [`self_hosted`](https://reference.langchain.com/python/langchain-classic/embeddings/self_hosted) - [`nlpcloud`](https://reference.langchain.com/python/langchain-classic/embeddings/nlpcloud) - [`embaas`](https://reference.langchain.com/python/langchain-classic/embeddings/embaas) - [`chat_models`](https://reference.langchain.com/python/langchain-classic/chat_models) - [`yandex`](https://reference.langchain.com/python/langchain-classic/chat_models/yandex) - [`mlflow`](https://reference.langchain.com/python/langchain-classic/chat_models/mlflow) - [`konko`](https://reference.langchain.com/python/langchain-classic/chat_models/konko) - [`google_palm`](https://reference.langchain.com/python/langchain-classic/chat_models/google_palm) - [`anthropic`](https://reference.langchain.com/python/langchain-classic/chat_models/anthropic) - [`mlflow_ai_gateway`](https://reference.langchain.com/python/langchain-classic/chat_models/mlflow_ai_gateway) - [`fake`](https://reference.langchain.com/python/langchain-classic/chat_models/fake) - [`vertexai`](https://reference.langchain.com/python/langchain-classic/chat_models/vertexai) - [`pai_eas_endpoint`](https://reference.langchain.com/python/langchain-classic/chat_models/pai_eas_endpoint) - [`baichuan`](https://reference.langchain.com/python/langchain-classic/chat_models/baichuan) - [`tongyi`](https://reference.langchain.com/python/langchain-classic/chat_models/tongyi) - [`minimax`](https://reference.langchain.com/python/langchain-classic/chat_models/minimax) - [`base`](https://reference.langchain.com/python/langchain-classic/chat_models/base) - [`volcengine_maas`](https://reference.langchain.com/python/langchain-classic/chat_models/volcengine_maas) - [`azure_openai`](https://reference.langchain.com/python/langchain-classic/chat_models/azure_openai) - [`gigachat`](https://reference.langchain.com/python/langchain-classic/chat_models/gigachat) - [`cohere`](https://reference.langchain.com/python/langchain-classic/chat_models/cohere) - [`databricks`](https://reference.langchain.com/python/langchain-classic/chat_models/databricks) - [`javelin_ai_gateway`](https://reference.langchain.com/python/langchain-classic/chat_models/javelin_ai_gateway) - [`openai`](https://reference.langchain.com/python/langchain-classic/chat_models/openai) - [`fireworks`](https://reference.langchain.com/python/langchain-classic/chat_models/fireworks) - [`jinachat`](https://reference.langchain.com/python/langchain-classic/chat_models/jinachat) - [`ernie`](https://reference.langchain.com/python/langchain-classic/chat_models/ernie) - [`promptlayer_openai`](https://reference.langchain.com/python/langchain-classic/chat_models/promptlayer_openai) - [`anyscale`](https://reference.langchain.com/python/langchain-classic/chat_models/anyscale) - [`baidu_qianfan_endpoint`](https://reference.langchain.com/python/langchain-classic/chat_models/baidu_qianfan_endpoint) - [`azureml_endpoint`](https://reference.langchain.com/python/langchain-classic/chat_models/azureml_endpoint) - [`ollama`](https://reference.langchain.com/python/langchain-classic/chat_models/ollama) - [`hunyuan`](https://reference.langchain.com/python/langchain-classic/chat_models/hunyuan) - [`meta`](https://reference.langchain.com/python/langchain-classic/chat_models/meta) - [`bedrock`](https://reference.langchain.com/python/langchain-classic/chat_models/bedrock) - [`human`](https://reference.langchain.com/python/langchain-classic/chat_models/human) - [`litellm`](https://reference.langchain.com/python/langchain-classic/chat_models/litellm) - [`everlyai`](https://reference.langchain.com/python/langchain-classic/chat_models/everlyai) - [`vectorstores`](https://reference.langchain.com/python/langchain-classic/vectorstores) - [`rocksetdb`](https://reference.langchain.com/python/langchain-classic/vectorstores/rocksetdb) - [`meilisearch`](https://reference.langchain.com/python/langchain-classic/vectorstores/meilisearch) - [`zilliz`](https://reference.langchain.com/python/langchain-classic/vectorstores/zilliz) - [`momento_vector_index`](https://reference.langchain.com/python/langchain-classic/vectorstores/momento_vector_index) - [`marqo`](https://reference.langchain.com/python/langchain-classic/vectorstores/marqo) - [`sklearn`](https://reference.langchain.com/python/langchain-classic/vectorstores/sklearn) - [`elastic_vector_search`](https://reference.langchain.com/python/langchain-classic/vectorstores/elastic_vector_search) - [`azuresearch`](https://reference.langchain.com/python/langchain-classic/vectorstores/azuresearch) - [`qdrant`](https://reference.langchain.com/python/langchain-classic/vectorstores/qdrant) - [`zep`](https://reference.langchain.com/python/langchain-classic/vectorstores/zep) - [`dashvector`](https://reference.langchain.com/python/langchain-classic/vectorstores/dashvector) - [`neo4j_vector`](https://reference.langchain.com/python/langchain-classic/vectorstores/neo4j_vector) - [`tencentvectordb`](https://reference.langchain.com/python/langchain-classic/vectorstores/tencentvectordb) - [`timescalevector`](https://reference.langchain.com/python/langchain-classic/vectorstores/timescalevector) - [`usearch`](https://reference.langchain.com/python/langchain-classic/vectorstores/usearch) - [`clickhouse`](https://reference.langchain.com/python/langchain-classic/vectorstores/clickhouse) - [`hippo`](https://reference.langchain.com/python/langchain-classic/vectorstores/hippo) - [`epsilla`](https://reference.langchain.com/python/langchain-classic/vectorstores/epsilla) - [`utils`](https://reference.langchain.com/python/langchain-classic/vectorstores/utils) - [`tiledb`](https://reference.langchain.com/python/langchain-classic/vectorstores/tiledb) - [`myscale`](https://reference.langchain.com/python/langchain-classic/vectorstores/myscale) - [`weaviate`](https://reference.langchain.com/python/langchain-classic/vectorstores/weaviate) - [`hologres`](https://reference.langchain.com/python/langchain-classic/vectorstores/hologres) - [`xata`](https://reference.langchain.com/python/langchain-classic/vectorstores/xata) - [`pgvector`](https://reference.langchain.com/python/langchain-classic/vectorstores/pgvector) - [`supabase`](https://reference.langchain.com/python/langchain-classic/vectorstores/supabase) - [`base`](https://reference.langchain.com/python/langchain-classic/vectorstores/base) - [`analyticdb`](https://reference.langchain.com/python/langchain-classic/vectorstores/analyticdb) - [`elasticsearch`](https://reference.langchain.com/python/langchain-classic/vectorstores/elasticsearch) - [`nucliadb`](https://reference.langchain.com/python/langchain-classic/vectorstores/nucliadb) - [`semadb`](https://reference.langchain.com/python/langchain-classic/vectorstores/semadb) - [`annoy`](https://reference.langchain.com/python/langchain-classic/vectorstores/annoy) - [`llm_rails`](https://reference.langchain.com/python/langchain-classic/vectorstores/llm_rails) - [`starrocks`](https://reference.langchain.com/python/langchain-classic/vectorstores/starrocks) - [`sqlitevss`](https://reference.langchain.com/python/langchain-classic/vectorstores/sqlitevss) - [`vearch`](https://reference.langchain.com/python/langchain-classic/vectorstores/vearch) - [`vald`](https://reference.langchain.com/python/langchain-classic/vectorstores/vald) - [`matching_engine`](https://reference.langchain.com/python/langchain-classic/vectorstores/matching_engine) - [`typesense`](https://reference.langchain.com/python/langchain-classic/vectorstores/typesense) - [`astradb`](https://reference.langchain.com/python/langchain-classic/vectorstores/astradb) - [`chroma`](https://reference.langchain.com/python/langchain-classic/vectorstores/chroma) - [`lancedb`](https://reference.langchain.com/python/langchain-classic/vectorstores/lancedb) - [`cassandra`](https://reference.langchain.com/python/langchain-classic/vectorstores/cassandra) - [`bageldb`](https://reference.langchain.com/python/langchain-classic/vectorstores/bageldb) - [`milvus`](https://reference.langchain.com/python/langchain-classic/vectorstores/milvus) - [`mongodb_atlas`](https://reference.langchain.com/python/langchain-classic/vectorstores/mongodb_atlas) - [`vespa`](https://reference.langchain.com/python/langchain-classic/vectorstores/vespa) - [`dingo`](https://reference.langchain.com/python/langchain-classic/vectorstores/dingo) - [`alibabacloud_opensearch`](https://reference.langchain.com/python/langchain-classic/vectorstores/alibabacloud_opensearch) - [`deeplake`](https://reference.langchain.com/python/langchain-classic/vectorstores/deeplake) - [`opensearch_vector_search`](https://reference.langchain.com/python/langchain-classic/vectorstores/opensearch_vector_search) - [`atlas`](https://reference.langchain.com/python/langchain-classic/vectorstores/atlas) - [`pgvecto_rs`](https://reference.langchain.com/python/langchain-classic/vectorstores/pgvecto_rs) - [`clarifai`](https://reference.langchain.com/python/langchain-classic/vectorstores/clarifai) - [`databricks_vector_search`](https://reference.langchain.com/python/langchain-classic/vectorstores/databricks_vector_search) - [`awadb`](https://reference.langchain.com/python/langchain-classic/vectorstores/awadb) - [`baiducloud_vector_search`](https://reference.langchain.com/python/langchain-classic/vectorstores/baiducloud_vector_search) - [`pinecone`](https://reference.langchain.com/python/langchain-classic/vectorstores/pinecone) - [`singlestoredb`](https://reference.langchain.com/python/langchain-classic/vectorstores/singlestoredb) - [`yellowbrick`](https://reference.langchain.com/python/langchain-classic/vectorstores/yellowbrick) - [`tair`](https://reference.langchain.com/python/langchain-classic/vectorstores/tair) - [`azure_cosmos_db`](https://reference.langchain.com/python/langchain-classic/vectorstores/azure_cosmos_db) - [`scann`](https://reference.langchain.com/python/langchain-classic/vectorstores/scann) - [`faiss`](https://reference.langchain.com/python/langchain-classic/vectorstores/faiss) - [`pgembedding`](https://reference.langchain.com/python/langchain-classic/vectorstores/pgembedding) - [`vectara`](https://reference.langchain.com/python/langchain-classic/vectorstores/vectara) - [`redis`](https://reference.langchain.com/python/langchain-classic/vectorstores/redis) - [`schema`](https://reference.langchain.com/python/langchain-classic/vectorstores/redis/schema) - [`base`](https://reference.langchain.com/python/langchain-classic/vectorstores/redis/base) - [`filters`](https://reference.langchain.com/python/langchain-classic/vectorstores/redis/filters) - [`docarray`](https://reference.langchain.com/python/langchain-classic/vectorstores/docarray) - [`hnsw`](https://reference.langchain.com/python/langchain-classic/vectorstores/docarray/hnsw) - [`base`](https://reference.langchain.com/python/langchain-classic/vectorstores/docarray/base) - [`in_memory`](https://reference.langchain.com/python/langchain-classic/vectorstores/docarray/in_memory) - [`load`](https://reference.langchain.com/python/langchain-classic/load) - [`load`](https://reference.langchain.com/python/langchain-classic/load/load) - [`serializable`](https://reference.langchain.com/python/langchain-classic/load/serializable) - [`dump`](https://reference.langchain.com/python/langchain-classic/load/dump) - [`memory`](https://reference.langchain.com/python/langchain-classic/memory) - [`motorhead_memory`](https://reference.langchain.com/python/langchain-classic/memory/motorhead_memory) - [`summary`](https://reference.langchain.com/python/langchain-classic/memory/summary) - [`readonly`](https://reference.langchain.com/python/langchain-classic/memory/readonly) - [`vectorstore_token_buffer_memory`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory) - [`prompt`](https://reference.langchain.com/python/langchain-classic/memory/prompt) - [`utils`](https://reference.langchain.com/python/langchain-classic/memory/utils) - [`zep_memory`](https://reference.langchain.com/python/langchain-classic/memory/zep_memory) - [`buffer`](https://reference.langchain.com/python/langchain-classic/memory/buffer) - [`simple`](https://reference.langchain.com/python/langchain-classic/memory/simple) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore) - [`buffer_window`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window) - [`entity`](https://reference.langchain.com/python/langchain-classic/memory/entity) - [`summary_buffer`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer) - [`chat_memory`](https://reference.langchain.com/python/langchain-classic/memory/chat_memory) - [`token_buffer`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer) - [`combined`](https://reference.langchain.com/python/langchain-classic/memory/combined) - [`kg`](https://reference.langchain.com/python/langchain-classic/memory/kg) - [`chat_message_histories`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories) - [`rocksetdb`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/rocksetdb) - [`streamlit`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/streamlit) - [`mongodb`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/mongodb) - [`zep`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/zep) - [`dynamodb`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/dynamodb) - [`neo4j`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/neo4j) - [`xata`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/xata) - [`upstash_redis`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/upstash_redis) - [`elasticsearch`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/elasticsearch) - [`cosmos_db`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/cosmos_db) - [`firestore`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/firestore) - [`postgres`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/postgres) - [`astradb`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/astradb) - [`cassandra`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/cassandra) - [`sql`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/sql) - [`in_memory`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/in_memory) - [`singlestoredb`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/singlestoredb) - [`redis`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/redis) - [`file`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/file) - [`momento`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/momento) - [`docstore`](https://reference.langchain.com/python/langchain-classic/docstore) - [`document`](https://reference.langchain.com/python/langchain-classic/docstore/document) - [`arbitrary_fn`](https://reference.langchain.com/python/langchain-classic/docstore/arbitrary_fn) - [`base`](https://reference.langchain.com/python/langchain-classic/docstore/base) - [`in_memory`](https://reference.langchain.com/python/langchain-classic/docstore/in_memory) - [`wikipedia`](https://reference.langchain.com/python/langchain-classic/docstore/wikipedia) - [`indexes`](https://reference.langchain.com/python/langchain-classic/indexes) - [`graph`](https://reference.langchain.com/python/langchain-classic/indexes/graph) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore) - [`prompts`](https://reference.langchain.com/python/langchain-classic/indexes/prompts) - [`entity_extraction`](https://reference.langchain.com/python/langchain-classic/indexes/prompts/entity_extraction) - [`entity_summarization`](https://reference.langchain.com/python/langchain-classic/indexes/prompts/entity_summarization) - [`knowledge_triplet_extraction`](https://reference.langchain.com/python/langchain-classic/indexes/prompts/knowledge_triplet_extraction) - [`graphs`](https://reference.langchain.com/python/langchain-classic/graphs) - [`networkx_graph`](https://reference.langchain.com/python/langchain-classic/graphs/networkx_graph) - [`kuzu_graph`](https://reference.langchain.com/python/langchain-classic/graphs/kuzu_graph) - [`graph_document`](https://reference.langchain.com/python/langchain-classic/graphs/graph_document) - [`nebula_graph`](https://reference.langchain.com/python/langchain-classic/graphs/nebula_graph) - [`neo4j_graph`](https://reference.langchain.com/python/langchain-classic/graphs/neo4j_graph) - [`neptune_graph`](https://reference.langchain.com/python/langchain-classic/graphs/neptune_graph) - [`arangodb_graph`](https://reference.langchain.com/python/langchain-classic/graphs/arangodb_graph) - [`memgraph_graph`](https://reference.langchain.com/python/langchain-classic/graphs/memgraph_graph) - [`rdf_graph`](https://reference.langchain.com/python/langchain-classic/graphs/rdf_graph) - [`hugegraph`](https://reference.langchain.com/python/langchain-classic/graphs/hugegraph) - [`graph_store`](https://reference.langchain.com/python/langchain-classic/graphs/graph_store) - [`falkordb_graph`](https://reference.langchain.com/python/langchain-classic/graphs/falkordb_graph) - [`output_parsers`](https://reference.langchain.com/python/langchain-classic/output_parsers) - [`ernie_functions`](https://reference.langchain.com/python/langchain-classic/output_parsers/ernie_functions) - [`pandas_dataframe`](https://reference.langchain.com/python/langchain-classic/output_parsers/pandas_dataframe) - [`prompts`](https://reference.langchain.com/python/langchain-classic/output_parsers/prompts) - [`loading`](https://reference.langchain.com/python/langchain-classic/output_parsers/loading) - [`yaml`](https://reference.langchain.com/python/langchain-classic/output_parsers/yaml) - [`enum`](https://reference.langchain.com/python/langchain-classic/output_parsers/enum) - [`pydantic`](https://reference.langchain.com/python/langchain-classic/output_parsers/pydantic) - [`json`](https://reference.langchain.com/python/langchain-classic/output_parsers/json) - [`retry`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry) - [`structured`](https://reference.langchain.com/python/langchain-classic/output_parsers/structured) - [`list`](https://reference.langchain.com/python/langchain-classic/output_parsers/list) - [`datetime`](https://reference.langchain.com/python/langchain-classic/output_parsers/datetime) - [`openai_functions`](https://reference.langchain.com/python/langchain-classic/output_parsers/openai_functions) - [`format_instructions`](https://reference.langchain.com/python/langchain-classic/output_parsers/format_instructions) - [`regex_dict`](https://reference.langchain.com/python/langchain-classic/output_parsers/regex_dict) - [`combining`](https://reference.langchain.com/python/langchain-classic/output_parsers/combining) - [`fix`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix) - [`regex`](https://reference.langchain.com/python/langchain-classic/output_parsers/regex) - [`openai_tools`](https://reference.langchain.com/python/langchain-classic/output_parsers/openai_tools) - [`boolean`](https://reference.langchain.com/python/langchain-classic/output_parsers/boolean) - [`xml`](https://reference.langchain.com/python/langchain-classic/output_parsers/xml) - [`rail_parser`](https://reference.langchain.com/python/langchain-classic/output_parsers/rail_parser) - [`tools`](https://reference.langchain.com/python/langchain-classic/tools) - [`convert_to_openai`](https://reference.langchain.com/python/langchain-classic/tools/convert_to_openai) - [`retriever`](https://reference.langchain.com/python/langchain-classic/tools/retriever) - [`ifttt`](https://reference.langchain.com/python/langchain-classic/tools/ifttt) - [`render`](https://reference.langchain.com/python/langchain-classic/tools/render) - [`plugin`](https://reference.langchain.com/python/langchain-classic/tools/plugin) - [`yahoo_finance_news`](https://reference.langchain.com/python/langchain-classic/tools/yahoo_finance_news) - [`base`](https://reference.langchain.com/python/langchain-classic/tools/base) - [`wolfram_alpha`](https://reference.langchain.com/python/langchain-classic/tools/wolfram_alpha) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/wolfram_alpha/tool) - [`google_jobs`](https://reference.langchain.com/python/langchain-classic/tools/google_jobs) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/google_jobs/tool) - [`google_scholar`](https://reference.langchain.com/python/langchain-classic/tools/google_scholar) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/google_scholar/tool) - [`json`](https://reference.langchain.com/python/langchain-classic/tools/json) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/json/tool) - [`gmail`](https://reference.langchain.com/python/langchain-classic/tools/gmail) - [`create_draft`](https://reference.langchain.com/python/langchain-classic/tools/gmail/create_draft) - [`base`](https://reference.langchain.com/python/langchain-classic/tools/gmail/base) - [`get_thread`](https://reference.langchain.com/python/langchain-classic/tools/gmail/get_thread) - [`get_message`](https://reference.langchain.com/python/langchain-classic/tools/gmail/get_message) - [`send_message`](https://reference.langchain.com/python/langchain-classic/tools/gmail/send_message) - [`search`](https://reference.langchain.com/python/langchain-classic/tools/gmail/search) - [`stackexchange`](https://reference.langchain.com/python/langchain-classic/tools/stackexchange) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/stackexchange/tool) - [`google_serper`](https://reference.langchain.com/python/langchain-classic/tools/google_serper) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/google_serper/tool) - [`memorize`](https://reference.langchain.com/python/langchain-classic/tools/memorize) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/memorize/tool) - [`golden_query`](https://reference.langchain.com/python/langchain-classic/tools/golden_query) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/golden_query/tool) - [`jira`](https://reference.langchain.com/python/langchain-classic/tools/jira) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/jira/tool) - [`e2b_data_analysis`](https://reference.langchain.com/python/langchain-classic/tools/e2b_data_analysis) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/e2b_data_analysis/tool) - [`file_management`](https://reference.langchain.com/python/langchain-classic/tools/file_management) - [`delete`](https://reference.langchain.com/python/langchain-classic/tools/file_management/delete) - [`move`](https://reference.langchain.com/python/langchain-classic/tools/file_management/move) - [`copy`](https://reference.langchain.com/python/langchain-classic/tools/file_management/copy) - [`file_search`](https://reference.langchain.com/python/langchain-classic/tools/file_management/file_search) - [`list_dir`](https://reference.langchain.com/python/langchain-classic/tools/file_management/list_dir) - [`read`](https://reference.langchain.com/python/langchain-classic/tools/file_management/read) - [`write`](https://reference.langchain.com/python/langchain-classic/tools/file_management/write) - [`youtube`](https://reference.langchain.com/python/langchain-classic/tools/youtube) - [`search`](https://reference.langchain.com/python/langchain-classic/tools/youtube/search) - [`steamship_image_generation`](https://reference.langchain.com/python/langchain-classic/tools/steamship_image_generation) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/steamship_image_generation/tool) - [`graphql`](https://reference.langchain.com/python/langchain-classic/tools/graphql) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/graphql/tool) - [`google_places`](https://reference.langchain.com/python/langchain-classic/tools/google_places) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/google_places/tool) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/tools/vectorstore) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/vectorstore/tool) - [`multion`](https://reference.langchain.com/python/langchain-classic/tools/multion) - [`create_session`](https://reference.langchain.com/python/langchain-classic/tools/multion/create_session) - [`update_session`](https://reference.langchain.com/python/langchain-classic/tools/multion/update_session) - [`close_session`](https://reference.langchain.com/python/langchain-classic/tools/multion/close_session) - [`slack`](https://reference.langchain.com/python/langchain-classic/tools/slack) - [`schedule_message`](https://reference.langchain.com/python/langchain-classic/tools/slack/schedule_message) - [`base`](https://reference.langchain.com/python/langchain-classic/tools/slack/base) - [`get_message`](https://reference.langchain.com/python/langchain-classic/tools/slack/get_message) - [`get_channel`](https://reference.langchain.com/python/langchain-classic/tools/slack/get_channel) - [`send_message`](https://reference.langchain.com/python/langchain-classic/tools/slack/send_message) - [`searchapi`](https://reference.langchain.com/python/langchain-classic/tools/searchapi) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/searchapi/tool) - [`gitlab`](https://reference.langchain.com/python/langchain-classic/tools/gitlab) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/gitlab/tool) - [`spark_sql`](https://reference.langchain.com/python/langchain-classic/tools/spark_sql) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/spark_sql/tool) - [`interaction`](https://reference.langchain.com/python/langchain-classic/tools/interaction) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/interaction/tool) - [`requests`](https://reference.langchain.com/python/langchain-classic/tools/requests) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/requests/tool) - [`playwright`](https://reference.langchain.com/python/langchain-classic/tools/playwright) - [`get_elements`](https://reference.langchain.com/python/langchain-classic/tools/playwright/get_elements) - [`click`](https://reference.langchain.com/python/langchain-classic/tools/playwright/click) - [`navigate`](https://reference.langchain.com/python/langchain-classic/tools/playwright/navigate) - [`navigate_back`](https://reference.langchain.com/python/langchain-classic/tools/playwright/navigate_back) - [`base`](https://reference.langchain.com/python/langchain-classic/tools/playwright/base) - [`extract_text`](https://reference.langchain.com/python/langchain-classic/tools/playwright/extract_text) - [`extract_hyperlinks`](https://reference.langchain.com/python/langchain-classic/tools/playwright/extract_hyperlinks) - [`current_page`](https://reference.langchain.com/python/langchain-classic/tools/playwright/current_page) - [`nuclia`](https://reference.langchain.com/python/langchain-classic/tools/nuclia) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/nuclia/tool) - [`google_trends`](https://reference.langchain.com/python/langchain-classic/tools/google_trends) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/google_trends/tool) - [`brave_search`](https://reference.langchain.com/python/langchain-classic/tools/brave_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/brave_search/tool) - [`openweathermap`](https://reference.langchain.com/python/langchain-classic/tools/openweathermap) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/openweathermap/tool) - [`human`](https://reference.langchain.com/python/langchain-classic/tools/human) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/human/tool) - [`zapier`](https://reference.langchain.com/python/langchain-classic/tools/zapier) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/zapier/tool) - [`pubmed`](https://reference.langchain.com/python/langchain-classic/tools/pubmed) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/pubmed/tool) - [`merriam_webster`](https://reference.langchain.com/python/langchain-classic/tools/merriam_webster) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/merriam_webster/tool) - [`sleep`](https://reference.langchain.com/python/langchain-classic/tools/sleep) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/sleep/tool) - [`metaphor_search`](https://reference.langchain.com/python/langchain-classic/tools/metaphor_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/metaphor_search/tool) - [`arxiv`](https://reference.langchain.com/python/langchain-classic/tools/arxiv) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/arxiv/tool) - [`google_search`](https://reference.langchain.com/python/langchain-classic/tools/google_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/google_search/tool) - [`azure_cognitive_services`](https://reference.langchain.com/python/langchain-classic/tools/azure_cognitive_services) - [`image_analysis`](https://reference.langchain.com/python/langchain-classic/tools/azure_cognitive_services/image_analysis) - [`speech2text`](https://reference.langchain.com/python/langchain-classic/tools/azure_cognitive_services/speech2text) - [`text2speech`](https://reference.langchain.com/python/langchain-classic/tools/azure_cognitive_services/text2speech) - [`text_analytics_health`](https://reference.langchain.com/python/langchain-classic/tools/azure_cognitive_services/text_analytics_health) - [`form_recognizer`](https://reference.langchain.com/python/langchain-classic/tools/azure_cognitive_services/form_recognizer) - [`google_lens`](https://reference.langchain.com/python/langchain-classic/tools/google_lens) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/google_lens/tool) - [`ddg_search`](https://reference.langchain.com/python/langchain-classic/tools/ddg_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/ddg_search/tool) - [`powerbi`](https://reference.langchain.com/python/langchain-classic/tools/powerbi) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/powerbi/tool) - [`google_cloud`](https://reference.langchain.com/python/langchain-classic/tools/google_cloud) - [`texttospeech`](https://reference.langchain.com/python/langchain-classic/tools/google_cloud/texttospeech) - [`ainetwork`](https://reference.langchain.com/python/langchain-classic/tools/ainetwork) - [`rule`](https://reference.langchain.com/python/langchain-classic/tools/ainetwork/rule) - [`app`](https://reference.langchain.com/python/langchain-classic/tools/ainetwork/app) - [`base`](https://reference.langchain.com/python/langchain-classic/tools/ainetwork/base) - [`owner`](https://reference.langchain.com/python/langchain-classic/tools/ainetwork/owner) - [`transfer`](https://reference.langchain.com/python/langchain-classic/tools/ainetwork/transfer) - [`value`](https://reference.langchain.com/python/langchain-classic/tools/ainetwork/value) - [`bing_search`](https://reference.langchain.com/python/langchain-classic/tools/bing_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/bing_search/tool) - [`github`](https://reference.langchain.com/python/langchain-classic/tools/github) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/github/tool) - [`google_finance`](https://reference.langchain.com/python/langchain-classic/tools/google_finance) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/google_finance/tool) - [`bearly`](https://reference.langchain.com/python/langchain-classic/tools/bearly) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/bearly/tool) - [`wikipedia`](https://reference.langchain.com/python/langchain-classic/tools/wikipedia) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/wikipedia/tool) - [`clickup`](https://reference.langchain.com/python/langchain-classic/tools/clickup) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/clickup/tool) - [`amadeus`](https://reference.langchain.com/python/langchain-classic/tools/amadeus) - [`flight_search`](https://reference.langchain.com/python/langchain-classic/tools/amadeus/flight_search) - [`base`](https://reference.langchain.com/python/langchain-classic/tools/amadeus/base) - [`closest_airport`](https://reference.langchain.com/python/langchain-classic/tools/amadeus/closest_airport) - [`steam`](https://reference.langchain.com/python/langchain-classic/tools/steam) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/steam/tool) - [`reddit_search`](https://reference.langchain.com/python/langchain-classic/tools/reddit_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/reddit_search/tool) - [`dataforseo_api_search`](https://reference.langchain.com/python/langchain-classic/tools/dataforseo_api_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/dataforseo_api_search/tool) - [`scenexplain`](https://reference.langchain.com/python/langchain-classic/tools/scenexplain) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/scenexplain/tool) - [`searx_search`](https://reference.langchain.com/python/langchain-classic/tools/searx_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/searx_search/tool) - [`nasa`](https://reference.langchain.com/python/langchain-classic/tools/nasa) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/nasa/tool) - [`office365`](https://reference.langchain.com/python/langchain-classic/tools/office365) - [`create_draft_message`](https://reference.langchain.com/python/langchain-classic/tools/office365/create_draft_message) - [`base`](https://reference.langchain.com/python/langchain-classic/tools/office365/base) - [`events_search`](https://reference.langchain.com/python/langchain-classic/tools/office365/events_search) - [`messages_search`](https://reference.langchain.com/python/langchain-classic/tools/office365/messages_search) - [`send_event`](https://reference.langchain.com/python/langchain-classic/tools/office365/send_event) - [`send_message`](https://reference.langchain.com/python/langchain-classic/tools/office365/send_message) - [`eleven_labs`](https://reference.langchain.com/python/langchain-classic/tools/eleven_labs) - [`models`](https://reference.langchain.com/python/langchain-classic/tools/eleven_labs/models) - [`text2speech`](https://reference.langchain.com/python/langchain-classic/tools/eleven_labs/text2speech) - [`python`](https://reference.langchain.com/python/langchain-classic/tools/python) - [`edenai`](https://reference.langchain.com/python/langchain-classic/tools/edenai) - [`text_moderation`](https://reference.langchain.com/python/langchain-classic/tools/edenai/text_moderation) - [`edenai_base_tool`](https://reference.langchain.com/python/langchain-classic/tools/edenai/edenai_base_tool) - [`image_explicitcontent`](https://reference.langchain.com/python/langchain-classic/tools/edenai/image_explicitcontent) - [`audio_speech_to_text`](https://reference.langchain.com/python/langchain-classic/tools/edenai/audio_speech_to_text) - [`ocr_invoiceparser`](https://reference.langchain.com/python/langchain-classic/tools/edenai/ocr_invoiceparser) - [`image_objectdetection`](https://reference.langchain.com/python/langchain-classic/tools/edenai/image_objectdetection) - [`ocr_identityparser`](https://reference.langchain.com/python/langchain-classic/tools/edenai/ocr_identityparser) - [`audio_text_to_speech`](https://reference.langchain.com/python/langchain-classic/tools/edenai/audio_text_to_speech) - [`openapi`](https://reference.langchain.com/python/langchain-classic/tools/openapi) - [`utils`](https://reference.langchain.com/python/langchain-classic/tools/openapi/utils) - [`api_models`](https://reference.langchain.com/python/langchain-classic/tools/openapi/utils/api_models) - [`openapi_utils`](https://reference.langchain.com/python/langchain-classic/tools/openapi/utils/openapi_utils) - [`sql_database`](https://reference.langchain.com/python/langchain-classic/tools/sql_database) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/sql_database/tool) - [`prompt`](https://reference.langchain.com/python/langchain-classic/tools/sql_database/prompt) - [`shell`](https://reference.langchain.com/python/langchain-classic/tools/shell) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/shell/tool) - [`tavily_search`](https://reference.langchain.com/python/langchain-classic/tools/tavily_search) - [`tool`](https://reference.langchain.com/python/langchain-classic/tools/tavily_search/tool) - [`adapters`](https://reference.langchain.com/python/langchain-classic/adapters) - [`openai`](https://reference.langchain.com/python/langchain-classic/adapters/openai) ## Types - [`CRITERIA_TYPE`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CRITERIA_TYPE) - [`CHAT_TURN_TYPE`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/CHAT_TURN_TYPE) - [`AGENT_TYPE`](https://reference.langchain.com/python/langchain-classic/agents/types/AGENT_TYPE) - [`RunnableAgentType`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgentType) - [`OutputType`](https://reference.langchain.com/python/langchain-classic/agents/openai_assistant/base/OutputType) - [`MODEL_OR_CHAIN_FACTORY`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/MODEL_OR_CHAIN_FACTORY) - [`MCF`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/MCF) - [`CUSTOM_EVALUATOR_TYPE`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/CUSTOM_EVALUATOR_TYPE) - [`SINGLE_EVAL_CONFIG_TYPE`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/SINGLE_EVAL_CONFIG_TYPE) ## Constants - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/sql_database/DEPRECATED_LOOKUP) - [`chains`](https://reference.langchain.com/python/langchain-classic/model_laboratory/ModelLaboratory/chains) - [`chain_colors`](https://reference.langchain.com/python/langchain-classic/model_laboratory/ModelLaboratory/chain_colors) - [`names`](https://reference.langchain.com/python/langchain-classic/model_laboratory/ModelLaboratory/names) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/cache/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/serpapi/DEPRECATED_LOOKUP) - [`model_config`](https://reference.langchain.com/python/langchain-classic/base_memory/BaseMemory/model_config) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/base_memory/BaseMemory/memory_variables) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/requests/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utils/ernie_functions/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utils/openai/DEPRECATED_LOOKUP) - [`logger`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/logger) - [`QA`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/QA) - [`COT_QA`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/COT_QA) - [`CONTEXT_QA`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/CONTEXT_QA) - [`PAIRWISE_STRING`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/PAIRWISE_STRING) - [`SCORE_STRING`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/SCORE_STRING) - [`LABELED_PAIRWISE_STRING`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/LABELED_PAIRWISE_STRING) - [`LABELED_SCORE_STRING`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/LABELED_SCORE_STRING) - [`AGENT_TRAJECTORY`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/AGENT_TRAJECTORY) - [`CRITERIA`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/CRITERIA) - [`LABELED_CRITERIA`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/LABELED_CRITERIA) - [`STRING_DISTANCE`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/STRING_DISTANCE) - [`EXACT_MATCH`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/EXACT_MATCH) - [`REGEX_MATCH`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/REGEX_MATCH) - [`PAIRWISE_STRING_DISTANCE`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/PAIRWISE_STRING_DISTANCE) - [`EMBEDDING_DISTANCE`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/EMBEDDING_DISTANCE) - [`PAIRWISE_EMBEDDING_DISTANCE`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/PAIRWISE_EMBEDDING_DISTANCE) - [`JSON_VALIDITY`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/JSON_VALIDITY) - [`JSON_EQUALITY`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/JSON_EQUALITY) - [`JSON_EDIT_DISTANCE`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/JSON_EDIT_DISTANCE) - [`JSON_SCHEMA_VALIDATION`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/EvaluatorType/JSON_SCHEMA_VALIDATION) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/_EvalArgsMixin/requires_reference) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/_EvalArgsMixin/requires_input) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/StringEvaluator/evaluation_name) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/StringEvaluator/requires_reference) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/schema/AgentTrajectoryEvaluator/requires_input) - [`logger`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/logger) - [`output_key`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/PairwiseStringEvalChain/output_key) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/PairwiseStringEvalChain/output_parser) - [`model_config`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/PairwiseStringEvalChain/model_config) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/PairwiseStringEvalChain/requires_reference) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/PairwiseStringEvalChain/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/eval_chain/LabeledPairwiseStringEvalChain/requires_reference) - [`SYSTEM_MESSAGE`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/prompt/SYSTEM_MESSAGE) - [`CRITERIA_INSTRUCTIONS`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/prompt/CRITERIA_INSTRUCTIONS) - [`COMPARISON_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/prompt/COMPARISON_TEMPLATE) - [`COMPARISON_TEMPLATE_WITH_REFERENCE`](https://reference.langchain.com/python/langchain-classic/evaluation/comparison/prompt/COMPARISON_TEMPLATE_WITH_REFERENCE) - [`ignore_case`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base/ExactMatchStringEvaluator/ignore_case) - [`ignore_punctuation`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base/ExactMatchStringEvaluator/ignore_punctuation) - [`ignore_numbers`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base/ExactMatchStringEvaluator/ignore_numbers) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base/ExactMatchStringEvaluator/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base/ExactMatchStringEvaluator/requires_reference) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base/ExactMatchStringEvaluator/input_keys) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/exact_match/base/ExactMatchStringEvaluator/evaluation_name) - [`flags`](https://reference.langchain.com/python/langchain-classic/evaluation/regex_match/base/RegexMatchStringEvaluator/flags) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/regex_match/base/RegexMatchStringEvaluator/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/regex_match/base/RegexMatchStringEvaluator/requires_reference) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/regex_match/base/RegexMatchStringEvaluator/input_keys) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/regex_match/base/RegexMatchStringEvaluator/evaluation_name) - [`logger`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/logger) - [`COSINE`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistance/COSINE) - [`EUCLIDEAN`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistance/EUCLIDEAN) - [`MANHATTAN`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistance/MANHATTAN) - [`CHEBYSHEV`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistance/CHEBYSHEV) - [`HAMMING`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistance/HAMMING) - [`embeddings`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/_EmbeddingDistanceChainMixin/embeddings) - [`distance_metric`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/_EmbeddingDistanceChainMixin/distance_metric) - [`model_config`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/_EmbeddingDistanceChainMixin/model_config) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/_EmbeddingDistanceChainMixin/output_keys) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistanceEvalChain/requires_reference) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistanceEvalChain/evaluation_name) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/EmbeddingDistanceEvalChain/input_keys) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/PairwiseEmbeddingDistanceEvalChain/input_keys) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/embedding_distance/base/PairwiseEmbeddingDistanceEvalChain/evaluation_name) - [`score`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEval/score) - [`reasoning`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEval/reasoning) - [`agent_tools`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain/agent_tools) - [`eval_chain`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain/eval_chain) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain/output_parser) - [`return_reasoning`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain/return_reasoning) - [`model_config`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain/model_config) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain/requires_reference) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_chain/TrajectoryEvalChain/output_keys) - [`EVAL_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_prompt/EVAL_TEMPLATE) - [`EXAMPLE_INPUT`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_prompt/EXAMPLE_INPUT) - [`EXAMPLE_OUTPUT`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_prompt/EXAMPLE_OUTPUT) - [`EVAL_CHAT_PROMPT`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_prompt/EVAL_CHAT_PROMPT) - [`TOOL_FREE_EVAL_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_prompt/TOOL_FREE_EVAL_TEMPLATE) - [`TOOL_FREE_EVAL_CHAT_PROMPT`](https://reference.langchain.com/python/langchain-classic/evaluation/agents/trajectory_eval_prompt/TOOL_FREE_EVAL_CHAT_PROMPT) - [`CONCISENESS`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/CONCISENESS) - [`RELEVANCE`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/RELEVANCE) - [`CORRECTNESS`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/CORRECTNESS) - [`COHERENCE`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/COHERENCE) - [`HARMFULNESS`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/HARMFULNESS) - [`MALICIOUSNESS`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/MALICIOUSNESS) - [`HELPFULNESS`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/HELPFULNESS) - [`CONTROVERSIALITY`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/CONTROVERSIALITY) - [`MISOGYNY`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/MISOGYNY) - [`CRIMINALITY`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/CRIMINALITY) - [`INSENSITIVITY`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/INSENSITIVITY) - [`DEPTH`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/DEPTH) - [`CREATIVITY`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/CREATIVITY) - [`DETAIL`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/Criteria/DETAIL) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaEvalChain/output_parser) - [`criterion_name`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaEvalChain/criterion_name) - [`output_key`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaEvalChain/output_key) - [`model_config`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaEvalChain/model_config) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaEvalChain/requires_reference) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaEvalChain/requires_input) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/CriteriaEvalChain/evaluation_name) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/eval_chain/LabeledCriteriaEvalChain/requires_reference) - [`template`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/prompt/template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/prompt/PROMPT) - [`PROMPT_WITH_REFERENCES`](https://reference.langchain.com/python/langchain-classic/evaluation/criteria/prompt/PROMPT_WITH_REFERENCES) - [`template`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/generate_prompt/template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/generate_prompt/PROMPT) - [`output_key`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/QAEvalChain/output_key) - [`model_config`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/QAEvalChain/model_config) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/QAEvalChain/evaluation_name) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/QAEvalChain/requires_reference) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/QAEvalChain/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/ContextQAEvalChain/requires_reference) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/ContextQAEvalChain/requires_input) - [`model_config`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/ContextQAEvalChain/model_config) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/ContextQAEvalChain/evaluation_name) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_chain/CotQAEvalChain/evaluation_name) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/generate_chain/QAGenerateChain/output_parser) - [`output_key`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/generate_chain/QAGenerateChain/output_key) - [`template`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_prompt/template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_prompt/PROMPT) - [`context_template`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_prompt/context_template) - [`CONTEXT_PROMPT`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_prompt/CONTEXT_PROMPT) - [`cot_template`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_prompt/cot_template) - [`COT_PROMPT`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_prompt/COT_PROMPT) - [`SQL_PROMPT`](https://reference.langchain.com/python/langchain-classic/evaluation/qa/eval_prompt/SQL_PROMPT) - [`logger`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/logger) - [`output_key`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain/output_key) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain/output_parser) - [`normalize_by`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain/normalize_by) - [`criterion_name`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain/criterion_name) - [`model_config`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain/model_config) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain/requires_reference) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain/requires_input) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/ScoreStringEvalChain/evaluation_name) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/eval_chain/LabeledScoreStringEvalChain/requires_reference) - [`SYSTEM_MESSAGE`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/prompt/SYSTEM_MESSAGE) - [`CRITERIA_INSTRUCTIONS`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/prompt/CRITERIA_INSTRUCTIONS) - [`DEFAULT_CRITERIA`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/prompt/DEFAULT_CRITERIA) - [`SCORING_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/prompt/SCORING_TEMPLATE) - [`SCORING_TEMPLATE_WITH_REFERENCE`](https://reference.langchain.com/python/langchain-classic/evaluation/scoring/prompt/SCORING_TEMPLATE_WITH_REFERENCE) - [`DAMERAU_LEVENSHTEIN`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistance/DAMERAU_LEVENSHTEIN) - [`LEVENSHTEIN`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistance/LEVENSHTEIN) - [`JARO`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistance/JARO) - [`JARO_WINKLER`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistance/JARO_WINKLER) - [`HAMMING`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistance/HAMMING) - [`INDEL`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistance/INDEL) - [`distance`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/_RapidFuzzChainMixin/distance) - [`normalize_score`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/_RapidFuzzChainMixin/normalize_score) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/_RapidFuzzChainMixin/output_keys) - [`metric`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/_RapidFuzzChainMixin/metric) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistanceEvalChain/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistanceEvalChain/requires_reference) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistanceEvalChain/input_keys) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/StringDistanceEvalChain/evaluation_name) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/PairwiseStringDistanceEvalChain/input_keys) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/string_distance/base/PairwiseStringDistanceEvalChain/evaluation_name) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonValidityEvaluator/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonValidityEvaluator/requires_reference) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonValidityEvaluator/evaluation_name) - [`operator`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonEqualityEvaluator/operator) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonEqualityEvaluator/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonEqualityEvaluator/requires_reference) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/base/JsonEqualityEvaluator/evaluation_name) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_distance/JsonEditDistanceEvaluator/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_distance/JsonEditDistanceEvaluator/requires_reference) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_distance/JsonEditDistanceEvaluator/evaluation_name) - [`requires_input`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_schema/JsonSchemaEvaluator/requires_input) - [`requires_reference`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_schema/JsonSchemaEvaluator/requires_reference) - [`evaluation_name`](https://reference.langchain.com/python/langchain-classic/evaluation/parsing/json_schema/JsonSchemaEvaluator/evaluation_name) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chat_loaders/telegram/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chat_loaders/imessage/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chat_loaders/utils/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chat_loaders/gmail/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chat_loaders/whatsapp/DEPRECATED_LOOKUP) - [`module_lookup`](https://reference.langchain.com/python/langchain-classic/chat_loaders/facebook_messenger/module_lookup) - [`import_lookup`](https://reference.langchain.com/python/langchain-classic/chat_loaders/facebook_messenger/import_lookup) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chat_loaders/langsmith/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chat_loaders/slack/DEPRECATED_LOOKUP) - [`importer`](https://reference.langchain.com/python/langchain-classic/chains/importer) - [`default_prompt`](https://reference.langchain.com/python/langchain-classic/chains/prompt_selector/ConditionalPromptSelector/default_prompt) - [`conditionals`](https://reference.langchain.com/python/langchain-classic/chains/prompt_selector/ConditionalPromptSelector/conditionals) - [`URL_BASE`](https://reference.langchain.com/python/langchain-classic/chains/loading/URL_BASE) - [`type_to_loader_dict`](https://reference.langchain.com/python/langchain-classic/chains/loading/type_to_loader_dict) - [`TEST_GEN_TEMPLATE_SUFFIX`](https://reference.langchain.com/python/langchain-classic/chains/example_generator/TEST_GEN_TEMPLATE_SUFFIX) - [`logger`](https://reference.langchain.com/python/langchain-classic/chains/base/logger) - [`memory`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/memory) - [`callbacks`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/callbacks) - [`verbose`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/verbose) - [`tags`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/tags) - [`metadata`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/metadata) - [`callback_manager`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/callback_manager) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/base/Chain/output_keys) - [`logger`](https://reference.langchain.com/python/langchain-classic/chains/transform/logger) - [`input_variables`](https://reference.langchain.com/python/langchain-classic/chains/transform/TransformChain/input_variables) - [`output_variables`](https://reference.langchain.com/python/langchain-classic/chains/transform/TransformChain/output_variables) - [`transform_cb`](https://reference.langchain.com/python/langchain-classic/chains/transform/TransformChain/transform_cb) - [`atransform_cb`](https://reference.langchain.com/python/langchain-classic/chains/transform/TransformChain/atransform_cb) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/transform/TransformChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/transform/TransformChain/output_keys) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/llm_requests/DEPRECATED_LOOKUP) - [`chains`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain/chains) - [`input_variables`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain/input_variables) - [`output_variables`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain/output_variables) - [`return_all`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain/return_all) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain/output_keys) - [`chains`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SimpleSequentialChain/chains) - [`strip_outputs`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SimpleSequentialChain/strip_outputs) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SimpleSequentialChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SimpleSequentialChain/output_key) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SimpleSequentialChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SimpleSequentialChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SimpleSequentialChain/output_keys) - [`combine_documents_chain`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce/MapReduceChain/combine_documents_chain) - [`text_splitter`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce/MapReduceChain/text_splitter) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce/MapReduceChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce/MapReduceChain/output_key) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce/MapReduceChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce/MapReduceChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/mapreduce/MapReduceChain/output_keys) - [`client`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/client) - [`async_client`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/async_client) - [`model_name`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/model_name) - [`error`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/error) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/output_key) - [`openai_api_key`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/openai_api_key) - [`openai_organization`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/openai_organization) - [`openai_pre_1_0`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/openai_pre_1_0) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/moderation/OpenAIModerationChain/output_keys) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/prompt) - [`llm`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/llm) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/output_key) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/output_parser) - [`return_final_only`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/return_final_only) - [`llm_kwargs`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/llm_kwargs) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/llm/LLMChain/output_keys) - [`logger`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/logger) - [`black_listed_elements`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/black_listed_elements) - [`node_index`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/node_index) - [`backend_node_id`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/backend_node_id) - [`node_name`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/node_name) - [`node_value`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/node_value) - [`node_meta`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/node_meta) - [`is_clickable`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/is_clickable) - [`origin_x`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/origin_x) - [`origin_y`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/origin_y) - [`center_x`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/center_x) - [`center_y`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/ElementInViewPort/center_y) - [`browser`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/Crawler/browser) - [`page`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/Crawler/page) - [`page_element_buffer`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/Crawler/page_element_buffer) - [`client`](https://reference.langchain.com/python/langchain-classic/chains/natbot/crawler/Crawler/client) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/natbot/prompt/PROMPT) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/llm_chain) - [`objective`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/objective) - [`llm`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/llm) - [`input_url_key`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/input_url_key) - [`input_browser_content_key`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/input_browser_content_key) - [`previous_command`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/previous_command) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/output_key) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/natbot/base/NatBotChain/output_keys) - [`PRINCIPLES`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/principles/PRINCIPLES) - [`critique_example`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/prompts/critique_example) - [`revision_example`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/prompts/revision_example) - [`examples`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/prompts/examples) - [`CRITIQUE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/prompts/CRITIQUE_PROMPT) - [`REVISION_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/prompts/REVISION_PROMPT) - [`chain`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base/ConstitutionalChain/chain) - [`constitutional_principles`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base/ConstitutionalChain/constitutional_principles) - [`critique_chain`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base/ConstitutionalChain/critique_chain) - [`revision_chain`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base/ConstitutionalChain/revision_chain) - [`return_intermediate_steps`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base/ConstitutionalChain/return_intermediate_steps) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base/ConstitutionalChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/base/ConstitutionalChain/output_keys) - [`critique_request`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/models/ConstitutionalPrinciple/critique_request) - [`revision_request`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/models/ConstitutionalPrinciple/revision_request) - [`name`](https://reference.langchain.com/python/langchain-classic/chains/constitutional_ai/models/ConstitutionalPrinciple/name) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/prompt/PROMPT) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain/llm_chain) - [`llm`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain/llm) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain/prompt) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain/output_key) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/llm_math/base/LLMMathChain/output_keys) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/ernie_functions/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/ernie_functions/base/DEPRECATED_LOOKUP) - [`fact`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match/FactWithEvidence/fact) - [`substring_quote`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match/FactWithEvidence/substring_quote) - [`question`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match/QuestionAnswer/question) - [`answer`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/citation_fuzzy_match/QuestionAnswer/answer) - [`answer`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/qa_with_structure/AnswerWithSources/answer) - [`sources`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/qa_with_structure/AnswerWithSources/sources) - [`request_method`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi/SimpleRequestChain/request_method) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi/SimpleRequestChain/output_key) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi/SimpleRequestChain/input_key) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi/SimpleRequestChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/openai_functions/openapi/SimpleRequestChain/output_keys) - [`OPEN_METEO_DOCS`](https://reference.langchain.com/python/langchain-classic/chains/api/open_meteo_docs/OPEN_METEO_DOCS) - [`PODCAST_DOCS`](https://reference.langchain.com/python/langchain-classic/chains/api/podcast_docs/PODCAST_DOCS) - [`API_URL_PROMPT_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/api/prompt/API_URL_PROMPT_TEMPLATE) - [`API_URL_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/api/prompt/API_URL_PROMPT) - [`API_RESPONSE_PROMPT_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/api/prompt/API_RESPONSE_PROMPT_TEMPLATE) - [`API_RESPONSE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/api/prompt/API_RESPONSE_PROMPT) - [`NEWS_DOCS`](https://reference.langchain.com/python/langchain-classic/chains/api/news_docs/NEWS_DOCS) - [`TMDB_DOCS`](https://reference.langchain.com/python/langchain-classic/chains/api/tmdb_docs/TMDB_DOCS) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi/chain/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi/prompts/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi/requests_chain/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/api/openapi/response_chain/DEPRECATED_LOOKUP) - [`initial_llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain/initial_llm_chain) - [`refine_llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain/refine_llm_chain) - [`document_variable_name`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain/document_variable_name) - [`initial_response_name`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain/initial_response_name) - [`document_prompt`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain/document_prompt) - [`return_intermediate_steps`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain/return_intermediate_steps) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain/output_keys) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/refine/RefineDocumentsChain/model_config) - [`combine_documents_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/ReduceDocumentsChain/combine_documents_chain) - [`collapse_documents_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/ReduceDocumentsChain/collapse_documents_chain) - [`token_max`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/ReduceDocumentsChain/token_max) - [`collapse_max_retries`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/ReduceDocumentsChain/collapse_max_retries) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/ReduceDocumentsChain/model_config) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain/llm_chain) - [`document_variable_name`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain/document_variable_name) - [`rank_key`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain/rank_key) - [`answer_key`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain/answer_key) - [`metadata_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain/metadata_keys) - [`return_intermediate_steps`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain/return_intermediate_steps) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain/model_config) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_rerank/MapRerankDocumentsChain/output_keys) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff/StuffDocumentsChain/llm_chain) - [`document_prompt`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff/StuffDocumentsChain/document_prompt) - [`document_variable_name`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff/StuffDocumentsChain/document_variable_name) - [`document_separator`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff/StuffDocumentsChain/document_separator) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff/StuffDocumentsChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/stuff/StuffDocumentsChain/input_keys) - [`DEFAULT_DOCUMENT_SEPARATOR`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/DEFAULT_DOCUMENT_SEPARATOR) - [`DOCUMENTS_KEY`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/DOCUMENTS_KEY) - [`DEFAULT_DOCUMENT_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/DEFAULT_DOCUMENT_PROMPT) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/BaseCombineDocumentsChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/BaseCombineDocumentsChain/output_key) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/BaseCombineDocumentsChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/BaseCombineDocumentsChain/output_keys) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/AnalyzeDocumentChain/input_key) - [`text_splitter`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/AnalyzeDocumentChain/text_splitter) - [`combine_docs_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/AnalyzeDocumentChain/combine_docs_chain) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/AnalyzeDocumentChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/base/AnalyzeDocumentChain/output_keys) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain/llm_chain) - [`reduce_documents_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain/reduce_documents_chain) - [`document_variable_name`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain/document_variable_name) - [`return_intermediate_steps`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain/return_intermediate_steps) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain/output_keys) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain/model_config) - [`collapse_document_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain/collapse_document_chain) - [`combine_document_chain`](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/map_reduce/MapReduceDocumentsChain/combine_document_chain) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/kuzu/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/arangodb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/prompts/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/cypher/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/gremlin/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/ontotext_graphdb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/base/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/neptune_sparql/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/nebulagraph/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/cypher_utils/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/falkordb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/neptune_cypher/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/hugegraph/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/graph_qa/sparql/DEPRECATED_LOOKUP) - [`web_search_template`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/web_search_template) - [`web_search`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/web_search) - [`sci_fact_template`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/sci_fact_template) - [`sci_fact`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/sci_fact) - [`arguana_template`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/arguana_template) - [`arguana`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/arguana) - [`trec_covid_template`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/trec_covid_template) - [`trec_covid`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/trec_covid) - [`fiqa_template`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/fiqa_template) - [`fiqa`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/fiqa) - [`dbpedia_entity_template`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/dbpedia_entity_template) - [`dbpedia_entity`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/dbpedia_entity) - [`trec_news_template`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/trec_news_template) - [`trec_news`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/trec_news) - [`mr_tydi_template`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/mr_tydi_template) - [`mr_tydi`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/mr_tydi) - [`PROMPT_MAP`](https://reference.langchain.com/python/langchain-classic/chains/hyde/prompts/PROMPT_MAP) - [`logger`](https://reference.langchain.com/python/langchain-classic/chains/hyde/base/logger) - [`base_embeddings`](https://reference.langchain.com/python/langchain-classic/chains/hyde/base/HypotheticalDocumentEmbedder/base_embeddings) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/hyde/base/HypotheticalDocumentEmbedder/llm_chain) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/hyde/base/HypotheticalDocumentEmbedder/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/hyde/base/HypotheticalDocumentEmbedder/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/hyde/base/HypotheticalDocumentEmbedder/output_keys) - [`CONDENSE_QUESTION_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/chat_vector_db/prompts/CONDENSE_QUESTION_PROMPT) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/chat_vector_db/prompts/prompt_template) - [`QA_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/chat_vector_db/prompts/QA_PROMPT) - [`templ1`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/prompt/templ1) - [`templ2`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/prompt/templ2) - [`CHAT_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/prompt/CHAT_PROMPT) - [`templ`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/prompt/templ) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/prompt/PROMPT) - [`PROMPT_SELECTOR`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/prompt/PROMPT_SELECTOR) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base/QAGenerationChain/llm_chain) - [`text_splitter`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base/QAGenerationChain/text_splitter) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base/QAGenerationChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base/QAGenerationChain/output_key) - [`k`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base/QAGenerationChain/k) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base/QAGenerationChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/qa_generation/base/QAGenerationChain/output_keys) - [`PROMPTS_DIR`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/PROMPTS_DIR) - [`logger`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/logger) - [`CREATE_ASSERTIONS_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/CREATE_ASSERTIONS_PROMPT) - [`CHECK_ASSERTIONS_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/CHECK_ASSERTIONS_PROMPT) - [`REVISED_SUMMARY_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/REVISED_SUMMARY_PROMPT) - [`ARE_ALL_TRUE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/ARE_ALL_TRUE_PROMPT) - [`sequential_chain`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/sequential_chain) - [`llm`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/llm) - [`create_assertions_prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/create_assertions_prompt) - [`check_assertions_prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/check_assertions_prompt) - [`revised_summary_prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/revised_summary_prompt) - [`are_all_true_prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/are_all_true_prompt) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/output_key) - [`max_checks`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/max_checks) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/llm_summarization_checker/base/LLMSummarizationCheckerChain/output_keys) - [`finished_value`](https://reference.langchain.com/python/langchain-classic/chains/flare/prompts/FinishedOutputParser/finished_value) - [`PROMPT_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/flare/prompts/PROMPT_TEMPLATE) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/flare/prompts/PROMPT) - [`QUESTION_GENERATOR_PROMPT_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/flare/prompts/QUESTION_GENERATOR_PROMPT_TEMPLATE) - [`QUESTION_GENERATOR_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/flare/prompts/QUESTION_GENERATOR_PROMPT) - [`logger`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/logger) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/QuestionGeneratorChain/prompt) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/QuestionGeneratorChain/input_keys) - [`question_generator_chain`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/question_generator_chain) - [`response_chain`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/response_chain) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/output_parser) - [`retriever`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/retriever) - [`min_prob`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/min_prob) - [`min_token_gap`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/min_token_gap) - [`num_pad_tokens`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/num_pad_tokens) - [`max_iter`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/max_iter) - [`start_with_retrieval`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/start_with_retrieval) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/flare/base/FlareChain/output_keys) - [`REFINE_PROMPT_TMPL`](https://reference.langchain.com/python/langchain-classic/chains/summarize/refine_prompts/REFINE_PROMPT_TMPL) - [`REFINE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/summarize/refine_prompts/REFINE_PROMPT) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/summarize/refine_prompts/prompt_template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/summarize/refine_prompts/PROMPT) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/summarize/stuff_prompt/prompt_template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/summarize/stuff_prompt/PROMPT) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/summarize/map_reduce_prompt/prompt_template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/summarize/map_reduce_prompt/PROMPT) - [`CONDENSE_QUESTION_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/prompts/CONDENSE_QUESTION_PROMPT) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/prompts/prompt_template) - [`QA_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/prompts/QA_PROMPT) - [`question`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/InputType/question) - [`chat_history`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/InputType/chat_history) - [`combine_docs_chain`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/combine_docs_chain) - [`question_generator`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/question_generator) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/output_key) - [`rephrase_question`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/rephrase_question) - [`return_source_documents`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/return_source_documents) - [`return_generated_question`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/return_generated_question) - [`get_chat_history`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/get_chat_history) - [`response_if_no_docs_found`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/response_if_no_docs_found) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/BaseConversationalRetrievalChain/output_keys) - [`retriever`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ConversationalRetrievalChain/retriever) - [`max_tokens_limit`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ConversationalRetrievalChain/max_tokens_limit) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ChatVectorDBChain/vectorstore) - [`top_k_docs_for_context`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ChatVectorDBChain/top_k_docs_for_context) - [`search_kwargs`](https://reference.langchain.com/python/langchain-classic/chains/conversational_retrieval/base/ChatVectorDBChain/search_kwargs) - [`name`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/schema/AttributeInfo/name) - [`description`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/schema/AttributeInfo/description) - [`type`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/schema/AttributeInfo/type) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/schema/AttributeInfo/model_config) - [`GRAMMAR`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/GRAMMAR) - [`date`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/ISO8601Date/date) - [`type`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/ISO8601Date/type) - [`datetime`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/ISO8601DateTime/datetime) - [`type`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/ISO8601DateTime/type) - [`allowed_comparators`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/QueryTransformer/allowed_comparators) - [`allowed_operators`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/QueryTransformer/allowed_operators) - [`allowed_attributes`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/QueryTransformer/allowed_attributes) - [`SONG_DATA_SOURCE`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/SONG_DATA_SOURCE) - [`FULL_ANSWER`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/FULL_ANSWER) - [`NO_FILTER_ANSWER`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/NO_FILTER_ANSWER) - [`WITH_LIMIT_ANSWER`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/WITH_LIMIT_ANSWER) - [`DEFAULT_EXAMPLES`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/DEFAULT_EXAMPLES) - [`EXAMPLES_WITH_LIMIT`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/EXAMPLES_WITH_LIMIT) - [`EXAMPLE_PROMPT_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/EXAMPLE_PROMPT_TEMPLATE) - [`EXAMPLE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/EXAMPLE_PROMPT) - [`USER_SPECIFIED_EXAMPLE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/USER_SPECIFIED_EXAMPLE_PROMPT) - [`DEFAULT_SCHEMA`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/DEFAULT_SCHEMA) - [`DEFAULT_SCHEMA_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/DEFAULT_SCHEMA_PROMPT) - [`SCHEMA_WITH_LIMIT`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/SCHEMA_WITH_LIMIT) - [`SCHEMA_WITH_LIMIT_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/SCHEMA_WITH_LIMIT_PROMPT) - [`DEFAULT_PREFIX`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/DEFAULT_PREFIX) - [`PREFIX_WITH_DATA_SOURCE`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/PREFIX_WITH_DATA_SOURCE) - [`DEFAULT_SUFFIX`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/DEFAULT_SUFFIX) - [`SUFFIX_WITHOUT_DATA_SOURCE`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/prompt/SUFFIX_WITHOUT_DATA_SOURCE) - [`ast_parse`](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/base/StructuredQueryOutputParser/ast_parse) - [`MULTI_RETRIEVAL_ROUTER_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_retrieval_prompt/MULTI_RETRIEVAL_ROUTER_TEMPLATE) - [`router_chain`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_retrieval_qa/MultiRetrievalQAChain/router_chain) - [`destination_chains`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_retrieval_qa/MultiRetrievalQAChain/destination_chains) - [`default_chain`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_retrieval_qa/MultiRetrievalQAChain/default_chain) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_retrieval_qa/MultiRetrievalQAChain/output_keys) - [`destination`](https://reference.langchain.com/python/langchain-classic/chains/router/base/Route/destination) - [`next_inputs`](https://reference.langchain.com/python/langchain-classic/chains/router/base/Route/next_inputs) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/router/base/RouterChain/output_keys) - [`router_chain`](https://reference.langchain.com/python/langchain-classic/chains/router/base/MultiRouteChain/router_chain) - [`destination_chains`](https://reference.langchain.com/python/langchain-classic/chains/router/base/MultiRouteChain/destination_chains) - [`default_chain`](https://reference.langchain.com/python/langchain-classic/chains/router/base/MultiRouteChain/default_chain) - [`silent_errors`](https://reference.langchain.com/python/langchain-classic/chains/router/base/MultiRouteChain/silent_errors) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/router/base/MultiRouteChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/router/base/MultiRouteChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/router/base/MultiRouteChain/output_keys) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/chains/router/llm_router/LLMRouterChain/llm_chain) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/router/llm_router/LLMRouterChain/input_keys) - [`default_destination`](https://reference.langchain.com/python/langchain-classic/chains/router/llm_router/RouterOutputParser/default_destination) - [`next_inputs_type`](https://reference.langchain.com/python/langchain-classic/chains/router/llm_router/RouterOutputParser/next_inputs_type) - [`next_inputs_inner_key`](https://reference.langchain.com/python/langchain-classic/chains/router/llm_router/RouterOutputParser/next_inputs_inner_key) - [`MULTI_PROMPT_ROUTER_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_prompt_prompt/MULTI_PROMPT_ROUTER_TEMPLATE) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/chains/router/embedding_router/EmbeddingRouterChain/vectorstore) - [`routing_keys`](https://reference.langchain.com/python/langchain-classic/chains/router/embedding_router/EmbeddingRouterChain/routing_keys) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/router/embedding_router/EmbeddingRouterChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/router/embedding_router/EmbeddingRouterChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/router/multi_prompt/MultiPromptChain/output_keys) - [`CREATE_DRAFT_ANSWER_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/prompt/CREATE_DRAFT_ANSWER_PROMPT) - [`LIST_ASSERTIONS_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/prompt/LIST_ASSERTIONS_PROMPT) - [`CHECK_ASSERTIONS_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/prompt/CHECK_ASSERTIONS_PROMPT) - [`REVISED_ANSWER_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/prompt/REVISED_ANSWER_PROMPT) - [`question_to_checked_assertions_chain`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/question_to_checked_assertions_chain) - [`llm`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/llm) - [`create_draft_answer_prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/create_draft_answer_prompt) - [`list_assertions_prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/list_assertions_prompt) - [`check_assertions_prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/check_assertions_prompt) - [`revised_answer_prompt`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/revised_answer_prompt) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/output_key) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/llm_checker/base/LLMCheckerChain/output_keys) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/prompt/prompt_template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/prompt/PROMPT) - [`combine_documents_chain`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/BaseRetrievalQA/combine_documents_chain) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/BaseRetrievalQA/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/BaseRetrievalQA/output_key) - [`return_source_documents`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/BaseRetrievalQA/return_source_documents) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/BaseRetrievalQA/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/BaseRetrievalQA/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/BaseRetrievalQA/output_keys) - [`retriever`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/RetrievalQA/retriever) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/VectorDBQA/vectorstore) - [`k`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/VectorDBQA/k) - [`search_type`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/VectorDBQA/search_type) - [`search_kwargs`](https://reference.langchain.com/python/langchain-classic/chains/retrieval_qa/base/VectorDBQA/search_kwargs) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/vector_db/VectorDBQAWithSourcesChain/vectorstore) - [`k`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/vector_db/VectorDBQAWithSourcesChain/k) - [`reduce_k_below_max_tokens`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/vector_db/VectorDBQAWithSourcesChain/reduce_k_below_max_tokens) - [`max_tokens_limit`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/vector_db/VectorDBQAWithSourcesChain/max_tokens_limit) - [`search_kwargs`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/vector_db/VectorDBQAWithSourcesChain/search_kwargs) - [`combine_documents_chain`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/combine_documents_chain) - [`question_key`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/question_key) - [`input_docs_key`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/input_docs_key) - [`answer_key`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/answer_key) - [`sources_answer_key`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/sources_answer_key) - [`return_source_documents`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/return_source_documents) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/BaseQAWithSourcesChain/output_keys) - [`input_docs_key`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/QAWithSourcesChain/input_docs_key) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/base/QAWithSourcesChain/input_keys) - [`DEFAULT_REFINE_PROMPT_TMPL`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/refine_prompts/DEFAULT_REFINE_PROMPT_TMPL) - [`DEFAULT_REFINE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/refine_prompts/DEFAULT_REFINE_PROMPT) - [`DEFAULT_TEXT_QA_PROMPT_TMPL`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/refine_prompts/DEFAULT_TEXT_QA_PROMPT_TMPL) - [`DEFAULT_TEXT_QA_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/refine_prompts/DEFAULT_TEXT_QA_PROMPT) - [`EXAMPLE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/refine_prompts/EXAMPLE_PROMPT) - [`template`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/stuff_prompt/template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/stuff_prompt/PROMPT) - [`EXAMPLE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/stuff_prompt/EXAMPLE_PROMPT) - [`retriever`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/retrieval/RetrievalQAWithSourcesChain/retriever) - [`reduce_k_below_max_tokens`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/retrieval/RetrievalQAWithSourcesChain/reduce_k_below_max_tokens) - [`max_tokens_limit`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/retrieval/RetrievalQAWithSourcesChain/max_tokens_limit) - [`question_prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/map_reduce_prompt/question_prompt_template) - [`QUESTION_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/map_reduce_prompt/QUESTION_PROMPT) - [`combine_prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/map_reduce_prompt/combine_prompt_template) - [`COMBINE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/map_reduce_prompt/COMBINE_PROMPT) - [`EXAMPLE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/qa_with_sources/map_reduce_prompt/EXAMPLE_PROMPT) - [`DEFAULT_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/conversation/prompt/DEFAULT_TEMPLATE) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/conversation/prompt/PROMPT) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/chains/conversation/memory/DEPRECATED_LOOKUP) - [`memory`](https://reference.langchain.com/python/langchain-classic/chains/conversation/base/ConversationChain/memory) - [`prompt`](https://reference.langchain.com/python/langchain-classic/chains/conversation/base/ConversationChain/prompt) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/conversation/base/ConversationChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/conversation/base/ConversationChain/output_key) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/conversation/base/ConversationChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/conversation/base/ConversationChain/input_keys) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_rerank_prompt/output_parser) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_rerank_prompt/prompt_template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_rerank_prompt/PROMPT) - [`DEFAULT_REFINE_PROMPT_TMPL`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/DEFAULT_REFINE_PROMPT_TMPL) - [`DEFAULT_REFINE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/DEFAULT_REFINE_PROMPT) - [`refine_template`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/refine_template) - [`CHAT_REFINE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/CHAT_REFINE_PROMPT) - [`REFINE_PROMPT_SELECTOR`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/REFINE_PROMPT_SELECTOR) - [`DEFAULT_TEXT_QA_PROMPT_TMPL`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/DEFAULT_TEXT_QA_PROMPT_TMPL) - [`DEFAULT_TEXT_QA_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/DEFAULT_TEXT_QA_PROMPT) - [`chat_qa_prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/chat_qa_prompt_template) - [`CHAT_QUESTION_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/CHAT_QUESTION_PROMPT) - [`QUESTION_PROMPT_SELECTOR`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/refine_prompts/QUESTION_PROMPT_SELECTOR) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/stuff_prompt/prompt_template) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/stuff_prompt/PROMPT) - [`system_template`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/stuff_prompt/system_template) - [`messages`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/stuff_prompt/messages) - [`CHAT_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/stuff_prompt/CHAT_PROMPT) - [`PROMPT_SELECTOR`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/stuff_prompt/PROMPT_SELECTOR) - [`question_prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/question_prompt_template) - [`QUESTION_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/QUESTION_PROMPT) - [`system_template`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/system_template) - [`messages`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/messages) - [`CHAT_QUESTION_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/CHAT_QUESTION_PROMPT) - [`QUESTION_PROMPT_SELECTOR`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/QUESTION_PROMPT_SELECTOR) - [`combine_prompt_template`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/combine_prompt_template) - [`COMBINE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/COMBINE_PROMPT) - [`CHAT_COMBINE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/CHAT_COMBINE_PROMPT) - [`COMBINE_PROMPT_SELECTOR`](https://reference.langchain.com/python/langchain-classic/chains/question_answering/map_reduce_prompt/COMBINE_PROMPT_SELECTOR) - [`PROMPT_SUFFIX`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/prompts/PROMPT_SUFFIX) - [`DEFAULT_DSL_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/prompts/DEFAULT_DSL_TEMPLATE) - [`DSL_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/prompts/DSL_PROMPT) - [`DEFAULT_ANSWER_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/prompts/DEFAULT_ANSWER_TEMPLATE) - [`ANSWER_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/prompts/ANSWER_PROMPT) - [`INTERMEDIATE_STEPS_KEY`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/INTERMEDIATE_STEPS_KEY) - [`query_chain`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/query_chain) - [`answer_chain`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/answer_chain) - [`database`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/database) - [`top_k`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/top_k) - [`ignore_indices`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/ignore_indices) - [`include_indices`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/include_indices) - [`input_key`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/input_key) - [`output_key`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/output_key) - [`sample_documents_in_index_info`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/sample_documents_in_index_info) - [`return_intermediate_steps`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/return_intermediate_steps) - [`model_config`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/model_config) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/chains/elasticsearch_database/base/ElasticsearchDatabaseChain/output_keys) - [`PROMPT_SUFFIX`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/PROMPT_SUFFIX) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/PROMPT) - [`DECIDER_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/DECIDER_PROMPT) - [`CRATEDB_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/CRATEDB_PROMPT) - [`DUCKDB_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/DUCKDB_PROMPT) - [`GOOGLESQL_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/GOOGLESQL_PROMPT) - [`MSSQL_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/MSSQL_PROMPT) - [`MYSQL_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/MYSQL_PROMPT) - [`MARIADB_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/MARIADB_PROMPT) - [`ORACLE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/ORACLE_PROMPT) - [`POSTGRES_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/POSTGRES_PROMPT) - [`SQLITE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/SQLITE_PROMPT) - [`CLICKHOUSE_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/CLICKHOUSE_PROMPT) - [`PRESTODB_PROMPT`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/PRESTODB_PROMPT) - [`SQL_PROMPTS`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/prompt/SQL_PROMPTS) - [`question`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/query/SQLInput/question) - [`question`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/query/SQLInputWithTables/question) - [`table_names_to_use`](https://reference.langchain.com/python/langchain-classic/chains/sql_database/query/SQLInputWithTables/table_names_to_use) - [`DEPRECATED_CODE`](https://reference.langchain.com/python/langchain-classic/agents/DEPRECATED_CODE) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/DEPRECATED_LOOKUP) - [`logger`](https://reference.langchain.com/python/langchain-classic/agents/loading/logger) - [`URL_BASE`](https://reference.langchain.com/python/langchain-classic/agents/loading/URL_BASE) - [`name`](https://reference.langchain.com/python/langchain-classic/agents/tools/InvalidTool/name) - [`description`](https://reference.langchain.com/python/langchain-classic/agents/tools/InvalidTool/description) - [`logger`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/logger) - [`inputs`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/inputs) - [`callbacks`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/callbacks) - [`tags`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/tags) - [`metadata`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/metadata) - [`run_name`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/run_name) - [`run_id`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/run_id) - [`include_run_info`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/include_run_info) - [`yield_actions`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/yield_actions) - [`agent_executor`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/agent_executor) - [`name_to_tool_map`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/name_to_tool_map) - [`color_mapping`](https://reference.langchain.com/python/langchain-classic/agents/agent_iterator/AgentExecutorIterator/color_mapping) - [`AGENT_TO_CLASS`](https://reference.langchain.com/python/langchain-classic/agents/types/AGENT_TO_CLASS) - [`logger`](https://reference.langchain.com/python/langchain-classic/agents/agent/logger) - [`return_values`](https://reference.langchain.com/python/langchain-classic/agents/agent/BaseSingleActionAgent/return_values) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/agents/agent/BaseSingleActionAgent/input_keys) - [`return_values`](https://reference.langchain.com/python/langchain-classic/agents/agent/BaseMultiActionAgent/return_values) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/agents/agent/BaseMultiActionAgent/input_keys) - [`runnable`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgent/runnable) - [`input_keys_arg`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgent/input_keys_arg) - [`return_keys_arg`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgent/return_keys_arg) - [`stream_runnable`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgent/stream_runnable) - [`model_config`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgent/model_config) - [`return_values`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgent/return_values) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableAgent/input_keys) - [`runnable`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableMultiActionAgent/runnable) - [`input_keys_arg`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableMultiActionAgent/input_keys_arg) - [`return_keys_arg`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableMultiActionAgent/return_keys_arg) - [`stream_runnable`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableMultiActionAgent/stream_runnable) - [`model_config`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableMultiActionAgent/model_config) - [`return_values`](https://reference.langchain.com/python/langchain-classic/agents/agent/RunnableMultiActionAgent/return_values) - 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[`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/powerbi/prompt/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/powerbi/base/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/powerbi/chat_base/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/ainetwork/toolkit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/github/toolkit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/clickup/toolkit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/amadeus/toolkit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/steam/toolkit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/nasa/toolkit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/office365/toolkit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/openapi/toolkit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/openapi/prompt/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/openapi/planner_prompt/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/openapi/base/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/openapi/planner/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/agents/agent_toolkits/openapi/spec/DEPRECATED_LOOKUP) - [`PROMPT`](https://reference.langchain.com/python/langchain-classic/agents/self_ask_with_search/prompt/PROMPT) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/agents/self_ask_with_search/base/SelfAskWithSearchAgent/output_parser) - [`observation_prefix`](https://reference.langchain.com/python/langchain-classic/agents/self_ask_with_search/base/SelfAskWithSearchAgent/observation_prefix) - [`llm_prefix`](https://reference.langchain.com/python/langchain-classic/agents/self_ask_with_search/base/SelfAskWithSearchAgent/llm_prefix) - [`FINAL_ANSWER_ACTION`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/react_single_input/FINAL_ANSWER_ACTION) - [`MISSING_ACTION_AFTER_THOUGHT_ERROR_MESSAGE`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/react_single_input/MISSING_ACTION_AFTER_THOUGHT_ERROR_MESSAGE) - [`MISSING_ACTION_INPUT_AFTER_ACTION_ERROR_MESSAGE`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/react_single_input/MISSING_ACTION_INPUT_AFTER_ACTION_ERROR_MESSAGE) - [`FINAL_ANSWER_AND_PARSABLE_ACTION_ERROR_MESSAGE`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/react_single_input/FINAL_ANSWER_AND_PARSABLE_ACTION_ERROR_MESSAGE) - [`tool_call_id`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/tools/ToolAgentAction/tool_call_id) - [`followups`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/self_ask/SelfAskOutputParser/followups) - [`finish_string`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/self_ask/SelfAskOutputParser/finish_string) - [`logger`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/json/logger) - [`FINAL_ANSWER_ACTION`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/react_json_single_input/FINAL_ANSWER_ACTION) - [`pattern`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/react_json_single_input/ReActJsonSingleInputOutputParser/pattern) - [`OpenAIToolAgentAction`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/openai_tools/OpenAIToolAgentAction) - [`escape_format`](https://reference.langchain.com/python/langchain-classic/agents/output_parsers/xml/XMLAgentOutputParser/escape_format) - [`EXAMPLES`](https://reference.langchain.com/python/langchain-classic/agents/react/wiki_prompt/EXAMPLES) - [`SUFFIX`](https://reference.langchain.com/python/langchain-classic/agents/react/wiki_prompt/SUFFIX) - [`WIKI_PROMPT`](https://reference.langchain.com/python/langchain-classic/agents/react/wiki_prompt/WIKI_PROMPT) - [`EXAMPLES`](https://reference.langchain.com/python/langchain-classic/agents/react/textworld_prompt/EXAMPLES) - [`SUFFIX`](https://reference.langchain.com/python/langchain-classic/agents/react/textworld_prompt/SUFFIX) - [`TEXTWORLD_PROMPT`](https://reference.langchain.com/python/langchain-classic/agents/react/textworld_prompt/TEXTWORLD_PROMPT) - [`output_parser`](https://reference.langchain.com/python/langchain-classic/agents/react/base/ReActDocstoreAgent/output_parser) - [`observation_prefix`](https://reference.langchain.com/python/langchain-classic/agents/react/base/ReActDocstoreAgent/observation_prefix) - [`llm_prefix`](https://reference.langchain.com/python/langchain-classic/agents/react/base/ReActDocstoreAgent/llm_prefix) - [`docstore`](https://reference.langchain.com/python/langchain-classic/agents/react/base/DocstoreExplorer/docstore) - [`document`](https://reference.langchain.com/python/langchain-classic/agents/react/base/DocstoreExplorer/document) - [`lookup_str`](https://reference.langchain.com/python/langchain-classic/agents/react/base/DocstoreExplorer/lookup_str) - [`lookup_index`](https://reference.langchain.com/python/langchain-classic/agents/react/base/DocstoreExplorer/lookup_index) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/html2text/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/google_translate/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/embeddings_redundant_filter/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/nuclia_text_transform/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/long_context_reorder/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/beautiful_soup_transformer/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/doctran_text_extract/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/doctran_text_translate/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/openai_functions/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/document_transformers/doctran_text_qa/DEPRECATED_LOOKUP) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunMapper/output_keys) - [`input_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/ChainStringRunMapper/input_key) - [`prediction_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/ChainStringRunMapper/prediction_key) - [`reference_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringExampleMapper/reference_key) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringExampleMapper/output_keys) - [`run_mapper`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunEvaluatorChain/run_mapper) - [`example_mapper`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunEvaluatorChain/example_mapper) - [`name`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunEvaluatorChain/name) - [`string_evaluator`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunEvaluatorChain/string_evaluator) - [`input_keys`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunEvaluatorChain/input_keys) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/string_run_evaluator/StringRunEvaluatorChain/output_keys) - [`adjectives`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/name_generation/adjectives) - [`nouns`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/name_generation/nouns) - [`logger`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/logger) - [`messages`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/ChatModelInput/messages) - [`feedback`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_RowResult/feedback) - [`execution_time`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_RowResult/execution_time) - [`run_id`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_RowResult/run_id) - [`client`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_DatasetRunContainer/client) - [`project`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_DatasetRunContainer/project) - [`wrapped_model`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_DatasetRunContainer/wrapped_model) - [`examples`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_DatasetRunContainer/examples) - [`configs`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_DatasetRunContainer/configs) - [`batch_evaluators`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/_DatasetRunContainer/batch_evaluators) - [`RUN_EVALUATOR_LIKE`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RUN_EVALUATOR_LIKE) - [`BATCH_EVALUATOR_LIKE`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/BATCH_EVALUATOR_LIKE) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/EvalConfig/evaluator_type) - [`reference_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/SingleKeyEvalConfig/reference_key) - [`prediction_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/SingleKeyEvalConfig/prediction_key) - [`input_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/SingleKeyEvalConfig/input_key) - [`evaluators`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/evaluators) - [`custom_evaluators`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/custom_evaluators) - [`batch_evaluators`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/batch_evaluators) - [`reference_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/reference_key) - [`prediction_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/prediction_key) - [`input_key`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/input_key) - [`eval_llm`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/eval_llm) - [`model_config`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/model_config) - [`criteria`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/Criteria/criteria) - [`llm`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/Criteria/llm) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/Criteria/evaluator_type) - [`criteria`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/LabeledCriteria/criteria) - [`llm`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/LabeledCriteria/llm) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/LabeledCriteria/evaluator_type) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/EmbeddingDistance/evaluator_type) - [`embeddings`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/EmbeddingDistance/embeddings) - [`distance_metric`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/EmbeddingDistance/distance_metric) - [`model_config`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/EmbeddingDistance/model_config) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/StringDistance/evaluator_type) - [`distance`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/StringDistance/distance) - [`normalize_score`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/StringDistance/normalize_score) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/QA/evaluator_type) - [`llm`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/QA/llm) - [`prompt`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/QA/prompt) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ContextQA/evaluator_type) - [`llm`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ContextQA/llm) - [`prompt`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ContextQA/prompt) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/CoTQA/evaluator_type) - [`llm`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/CoTQA/llm) - [`prompt`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/CoTQA/prompt) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/JsonValidity/evaluator_type) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/JsonEqualityEvaluator/evaluator_type) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ExactMatch/evaluator_type) - [`ignore_case`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ExactMatch/ignore_case) - [`ignore_punctuation`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ExactMatch/ignore_punctuation) - [`ignore_numbers`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ExactMatch/ignore_numbers) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/RegexMatch/evaluator_type) - [`flags`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/RegexMatch/flags) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ScoreString/evaluator_type) - [`criteria`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ScoreString/criteria) - [`llm`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ScoreString/llm) - [`normalize_by`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ScoreString/normalize_by) - [`prompt`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/ScoreString/prompt) - [`evaluator_type`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/LabeledScoreString/evaluator_type) - [`total`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/progress/ProgressBarCallback/total) - [`ncols`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/progress/ProgressBarCallback/ncols) - [`end_with`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/progress/ProgressBarCallback/end_with) - [`counter`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/progress/ProgressBarCallback/counter) - [`lock`](https://reference.langchain.com/python/langchain-classic/smith/evaluation/progress/ProgressBarCallback/lock) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/storage/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/storage/upstash_redis/DEPRECATED_LOOKUP) - [`K`](https://reference.langchain.com/python/langchain-classic/storage/encoder_backed/K) - [`V`](https://reference.langchain.com/python/langchain-classic/storage/encoder_backed/V) - [`store`](https://reference.langchain.com/python/langchain-classic/storage/encoder_backed/EncoderBackedStore/store) - [`key_encoder`](https://reference.langchain.com/python/langchain-classic/storage/encoder_backed/EncoderBackedStore/key_encoder) - [`value_serializer`](https://reference.langchain.com/python/langchain-classic/storage/encoder_backed/EncoderBackedStore/value_serializer) - [`value_deserializer`](https://reference.langchain.com/python/langchain-classic/storage/encoder_backed/EncoderBackedStore/value_deserializer) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/storage/redis/DEPRECATED_LOOKUP) - [`root_path`](https://reference.langchain.com/python/langchain-classic/storage/file_system/LocalFileStore/root_path) - [`chmod_file`](https://reference.langchain.com/python/langchain-classic/storage/file_system/LocalFileStore/chmod_file) - [`chmod_dir`](https://reference.langchain.com/python/langchain-classic/storage/file_system/LocalFileStore/chmod_dir) - [`update_atime`](https://reference.langchain.com/python/langchain-classic/storage/file_system/LocalFileStore/update_atime) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/zilliz/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/bm25/DEPRECATED_LOOKUP) - [`logger`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/logger) - [`DEFAULT_QUERY_PROMPT`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/DEFAULT_QUERY_PROMPT) - [`retriever`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/retriever) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/llm_chain) - [`verbose`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/verbose) - [`parser_key`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/parser_key) - [`include_original`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/include_original) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/arcee/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/google_cloud_documentai_warehouse/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/remote_retriever/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/embedchain/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/databerry/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/pubmed/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/zep/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/you/DEPRECATED_LOOKUP) - [`retrievers`](https://reference.langchain.com/python/langchain-classic/retrievers/merger_retriever/MergerRetriever/retrievers) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/pupmed/DEPRECATED_LOOKUP) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever/vectorstore) - [`search_kwargs`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever/search_kwargs) - [`memory_stream`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever/memory_stream) - [`decay_rate`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever/decay_rate) - [`k`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever/k) - [`other_score_keys`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever/other_score_keys) - [`default_salience`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever/default_salience) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/time_weighted_retriever/TimeWeightedVectorStoreRetriever/model_config) - [`T`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/T) - [`H`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/H) - [`retrievers`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/EnsembleRetriever/retrievers) - [`weights`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/EnsembleRetriever/weights) - [`c`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/EnsembleRetriever/c) - [`id_key`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/EnsembleRetriever/id_key) - [`config_specs`](https://reference.langchain.com/python/langchain-classic/retrievers/ensemble/EnsembleRetriever/config_specs) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/kay/DEPRECATED_LOOKUP) - [`similarity`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/SearchType/similarity) - [`similarity_score_threshold`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/SearchType/similarity_score_threshold) - [`mmr`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/SearchType/mmr) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/MultiVectorRetriever/vectorstore) - [`byte_store`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/MultiVectorRetriever/byte_store) - [`docstore`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/MultiVectorRetriever/docstore) - [`id_key`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/MultiVectorRetriever/id_key) - [`search_kwargs`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/MultiVectorRetriever/search_kwargs) - [`search_type`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_vector/MultiVectorRetriever/search_type) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/kendra/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/docarray/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/outline/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/knn/DEPRECATED_LOOKUP) - [`child_splitter`](https://reference.langchain.com/python/langchain-classic/retrievers/parent_document_retriever/ParentDocumentRetriever/child_splitter) - [`parent_splitter`](https://reference.langchain.com/python/langchain-classic/retrievers/parent_document_retriever/ParentDocumentRetriever/parent_splitter) - [`child_metadata_fields`](https://reference.langchain.com/python/langchain-classic/retrievers/parent_document_retriever/ParentDocumentRetriever/child_metadata_fields) - [`logger`](https://reference.langchain.com/python/langchain-classic/retrievers/re_phraser/logger) - [`DEFAULT_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/retrievers/re_phraser/DEFAULT_TEMPLATE) - [`DEFAULT_QUERY_PROMPT`](https://reference.langchain.com/python/langchain-classic/retrievers/re_phraser/DEFAULT_QUERY_PROMPT) - [`retriever`](https://reference.langchain.com/python/langchain-classic/retrievers/re_phraser/RePhraseQueryRetriever/retriever) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/retrievers/re_phraser/RePhraseQueryRetriever/llm_chain) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/tfidf/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/llama_index/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/arxiv/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/web_research/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/tavily_search_api/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/elastic_search_bm25/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/pinecone_hybrid_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/chatgpt_plugin_retriever/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/azure_ai_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/google_vertex_ai_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/milvus/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/weaviate_hybrid_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/svm/DEPRECATED_LOOKUP) - [`base_compressor`](https://reference.langchain.com/python/langchain-classic/retrievers/contextual_compression/ContextualCompressionRetriever/base_compressor) - [`base_retriever`](https://reference.langchain.com/python/langchain-classic/retrievers/contextual_compression/ContextualCompressionRetriever/base_retriever) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/contextual_compression/ContextualCompressionRetriever/model_config) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/cohere_rag_retriever/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/bedrock/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/wikipedia/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/vespa_retriever/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/metal/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/chaindesk/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/opensearch/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/qdrant/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/dashvector/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/tencentvectordb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/timescalevector/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/myscale/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/weaviate/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/pgvector/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/supabase/DEPRECATED_LOOKUP) - [`logger`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/logger) - [`QUERY_CONSTRUCTOR_RUN_NAME`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/QUERY_CONSTRUCTOR_RUN_NAME) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/vectorstore) - [`query_constructor`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/query_constructor) - [`search_type`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/search_type) - [`search_kwargs`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/search_kwargs) - [`structured_query_translator`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/structured_query_translator) - [`verbose`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/verbose) - [`use_original_query`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/use_original_query) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/model_config) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/base/SelfQueryRetriever/llm_chain) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/elasticsearch/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/astradb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/chroma/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/milvus/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/mongodb_atlas/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/dingo/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/deeplake/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/databricks_vector_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/pinecone/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/redis/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/self_query/vectara/DEPRECATED_LOOKUP) - [`client`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cohere_rerank/CohereRerank/client) - [`top_n`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cohere_rerank/CohereRerank/top_n) - [`model`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cohere_rerank/CohereRerank/model) - [`cohere_api_key`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cohere_rerank/CohereRerank/cohere_api_key) - [`user_agent`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cohere_rerank/CohereRerank/user_agent) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cohere_rerank/CohereRerank/model_config) - [`model`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cross_encoder_rerank/CrossEncoderReranker/model) - [`top_n`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cross_encoder_rerank/CrossEncoderReranker/top_n) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/cross_encoder_rerank/CrossEncoderReranker/model_config) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/LLMChainFilter/llm_chain) - [`get_input`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/LLMChainFilter/get_input) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/LLMChainFilter/model_config) - [`no_output_str`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_extract/NoOutputParser/no_output_str) - [`llm_chain`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_extract/LLMChainExtractor/llm_chain) - [`get_input`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_extract/LLMChainExtractor/get_input) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_extract/LLMChainExtractor/model_config) - [`reranker`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/listwise_rerank/LLMListwiseRerank/reranker) - [`top_n`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/listwise_rerank/LLMListwiseRerank/top_n) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/listwise_rerank/LLMListwiseRerank/model_config) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_extract_prompt/prompt_template) - [`transformers`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/base/DocumentCompressorPipeline/transformers) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/base/DocumentCompressorPipeline/model_config) - [`prompt_template`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter_prompt/prompt_template) - [`embeddings`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/embeddings_filter/EmbeddingsFilter/embeddings) - [`similarity_fn`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/embeddings_filter/EmbeddingsFilter/similarity_fn) - [`k`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/embeddings_filter/EmbeddingsFilter/k) - [`similarity_threshold`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/embeddings_filter/EmbeddingsFilter/similarity_threshold) - [`model_config`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/embeddings_filter/EmbeddingsFilter/model_config) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/flashrank_rerank/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utilities/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utilities/awslambda/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utilities/google_lens/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utilities/bing_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utilities/arcee/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utilities/tavily_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utilities/anthropic/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/utilities/scenexplain/DEPRECATED_LOOKUP) - 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[`queue`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_aiter/AsyncIteratorCallbackHandler/queue) - [`done`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_aiter/AsyncIteratorCallbackHandler/done) - [`always_verbose`](https://reference.langchain.com/python/langchain-classic/callbacks/streaming_aiter/AsyncIteratorCallbackHandler/always_verbose) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/callbacks/clearml_callback/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/callbacks/openai_info/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/callbacks/labelstudio_callback/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/callbacks/argilla_callback/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/callbacks/wandb_callback/DEPRECATED_LOOKUP) - 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[`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/epsilla/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/utils/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/tiledb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/myscale/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/weaviate/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/hologres/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/xata/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/pgvector/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/supabase/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/analyticdb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/elasticsearch/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/nucliadb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/semadb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/annoy/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/llm_rails/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/starrocks/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/sqlitevss/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/vearch/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/vald/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/matching_engine/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/typesense/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/astradb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/chroma/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/lancedb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/cassandra/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/bageldb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/milvus/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/mongodb_atlas/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/vespa/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/dingo/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/alibabacloud_opensearch/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/deeplake/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/opensearch_vector_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/atlas/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/pgvecto_rs/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/clarifai/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/databricks_vector_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/awadb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/baiducloud_vector_search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/pinecone/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/singlestoredb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/yellowbrick/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/tair/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/azure_cosmos_db/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/scann/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/faiss/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/pgembedding/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/vectara/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/redis/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/redis/schema/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/redis/base/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/redis/filters/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/docarray/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/docarray/hnsw/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/docarray/base/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/vectorstores/docarray/in_memory/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/motorhead_memory/DEPRECATED_LOOKUP) - [`human_prefix`](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin/human_prefix) - [`ai_prefix`](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin/ai_prefix) - [`llm`](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin/llm) - [`prompt`](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin/prompt) - [`summary_message_cls`](https://reference.langchain.com/python/langchain-classic/memory/summary/SummarizerMixin/summary_message_cls) - [`buffer`](https://reference.langchain.com/python/langchain-classic/memory/summary/ConversationSummaryMemory/buffer) - [`memory_key`](https://reference.langchain.com/python/langchain-classic/memory/summary/ConversationSummaryMemory/memory_key) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/summary/ConversationSummaryMemory/memory_variables) - [`memory`](https://reference.langchain.com/python/langchain-classic/memory/readonly/ReadOnlySharedMemory/memory) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/readonly/ReadOnlySharedMemory/memory_variables) - [`DEFAULT_HISTORY_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory/DEFAULT_HISTORY_TEMPLATE) - [`TIMESTAMP_FORMAT`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory/TIMESTAMP_FORMAT) - [`retriever`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory/ConversationVectorStoreTokenBufferMemory/retriever) - [`memory_key`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory/ConversationVectorStoreTokenBufferMemory/memory_key) - [`previous_history_template`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory/ConversationVectorStoreTokenBufferMemory/previous_history_template) - [`split_chunk_size`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory/ConversationVectorStoreTokenBufferMemory/split_chunk_size) - [`memory_retriever`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore_token_buffer_memory/ConversationVectorStoreTokenBufferMemory/memory_retriever) - [`ENTITY_MEMORY_CONVERSATION_TEMPLATE`](https://reference.langchain.com/python/langchain-classic/memory/prompt/ENTITY_MEMORY_CONVERSATION_TEMPLATE) - [`SUMMARY_PROMPT`](https://reference.langchain.com/python/langchain-classic/memory/prompt/SUMMARY_PROMPT) - [`ENTITY_EXTRACTION_PROMPT`](https://reference.langchain.com/python/langchain-classic/memory/prompt/ENTITY_EXTRACTION_PROMPT) - [`ENTITY_SUMMARIZATION_PROMPT`](https://reference.langchain.com/python/langchain-classic/memory/prompt/ENTITY_SUMMARIZATION_PROMPT) - [`KG_TRIPLE_DELIMITER`](https://reference.langchain.com/python/langchain-classic/memory/prompt/KG_TRIPLE_DELIMITER) - [`KNOWLEDGE_TRIPLE_EXTRACTION_PROMPT`](https://reference.langchain.com/python/langchain-classic/memory/prompt/KNOWLEDGE_TRIPLE_EXTRACTION_PROMPT) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/zep_memory/DEPRECATED_LOOKUP) - [`human_prefix`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationBufferMemory/human_prefix) - [`ai_prefix`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationBufferMemory/ai_prefix) - [`memory_key`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationBufferMemory/memory_key) - [`buffer`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationBufferMemory/buffer) - [`buffer_as_str`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationBufferMemory/buffer_as_str) - [`buffer_as_messages`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationBufferMemory/buffer_as_messages) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationBufferMemory/memory_variables) - [`human_prefix`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationStringBufferMemory/human_prefix) - [`ai_prefix`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationStringBufferMemory/ai_prefix) - [`buffer`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationStringBufferMemory/buffer) - [`output_key`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationStringBufferMemory/output_key) - [`input_key`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationStringBufferMemory/input_key) - [`memory_key`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationStringBufferMemory/memory_key) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/buffer/ConversationStringBufferMemory/memory_variables) - [`memories`](https://reference.langchain.com/python/langchain-classic/memory/simple/SimpleMemory/memories) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/simple/SimpleMemory/memory_variables) - [`retriever`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore/VectorStoreRetrieverMemory/retriever) - [`memory_key`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore/VectorStoreRetrieverMemory/memory_key) - [`input_key`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore/VectorStoreRetrieverMemory/input_key) - [`return_docs`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore/VectorStoreRetrieverMemory/return_docs) - [`exclude_input_keys`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore/VectorStoreRetrieverMemory/exclude_input_keys) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/vectorstore/VectorStoreRetrieverMemory/memory_variables) - [`human_prefix`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory/human_prefix) - [`ai_prefix`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory/ai_prefix) - [`memory_key`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory/memory_key) - [`k`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory/k) - [`buffer`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory/buffer) - [`buffer_as_str`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory/buffer_as_str) - [`buffer_as_messages`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory/buffer_as_messages) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/buffer_window/ConversationBufferWindowMemory/memory_variables) - [`logger`](https://reference.langchain.com/python/langchain-classic/memory/entity/logger) - [`store`](https://reference.langchain.com/python/langchain-classic/memory/entity/InMemoryEntityStore/store) - [`redis_client`](https://reference.langchain.com/python/langchain-classic/memory/entity/UpstashRedisEntityStore/redis_client) - [`session_id`](https://reference.langchain.com/python/langchain-classic/memory/entity/UpstashRedisEntityStore/session_id) - [`key_prefix`](https://reference.langchain.com/python/langchain-classic/memory/entity/UpstashRedisEntityStore/key_prefix) - [`ttl`](https://reference.langchain.com/python/langchain-classic/memory/entity/UpstashRedisEntityStore/ttl) - [`recall_ttl`](https://reference.langchain.com/python/langchain-classic/memory/entity/UpstashRedisEntityStore/recall_ttl) - [`full_key_prefix`](https://reference.langchain.com/python/langchain-classic/memory/entity/UpstashRedisEntityStore/full_key_prefix) - [`redis_client`](https://reference.langchain.com/python/langchain-classic/memory/entity/RedisEntityStore/redis_client) - [`session_id`](https://reference.langchain.com/python/langchain-classic/memory/entity/RedisEntityStore/session_id) - [`key_prefix`](https://reference.langchain.com/python/langchain-classic/memory/entity/RedisEntityStore/key_prefix) - [`ttl`](https://reference.langchain.com/python/langchain-classic/memory/entity/RedisEntityStore/ttl) - [`recall_ttl`](https://reference.langchain.com/python/langchain-classic/memory/entity/RedisEntityStore/recall_ttl) - [`full_key_prefix`](https://reference.langchain.com/python/langchain-classic/memory/entity/RedisEntityStore/full_key_prefix) - [`session_id`](https://reference.langchain.com/python/langchain-classic/memory/entity/SQLiteEntityStore/session_id) - [`table_name`](https://reference.langchain.com/python/langchain-classic/memory/entity/SQLiteEntityStore/table_name) - [`conn`](https://reference.langchain.com/python/langchain-classic/memory/entity/SQLiteEntityStore/conn) - [`model_config`](https://reference.langchain.com/python/langchain-classic/memory/entity/SQLiteEntityStore/model_config) - [`full_table_name`](https://reference.langchain.com/python/langchain-classic/memory/entity/SQLiteEntityStore/full_table_name) - [`human_prefix`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/human_prefix) - [`ai_prefix`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/ai_prefix) - [`llm`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/llm) - [`entity_extraction_prompt`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/entity_extraction_prompt) - [`entity_summarization_prompt`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/entity_summarization_prompt) - [`entity_cache`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/entity_cache) - [`k`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/k) - [`chat_history_key`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/chat_history_key) - [`entity_store`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/entity_store) - [`buffer`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/buffer) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/entity/ConversationEntityMemory/memory_variables) - [`max_token_limit`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/max_token_limit) - [`moving_summary_buffer`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/moving_summary_buffer) - [`memory_key`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/memory_key) - [`buffer`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/buffer) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/summary_buffer/ConversationSummaryBufferMemory/memory_variables) - [`chat_memory`](https://reference.langchain.com/python/langchain-classic/memory/chat_memory/BaseChatMemory/chat_memory) - [`output_key`](https://reference.langchain.com/python/langchain-classic/memory/chat_memory/BaseChatMemory/output_key) - [`input_key`](https://reference.langchain.com/python/langchain-classic/memory/chat_memory/BaseChatMemory/input_key) - [`return_messages`](https://reference.langchain.com/python/langchain-classic/memory/chat_memory/BaseChatMemory/return_messages) - [`human_prefix`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/human_prefix) - [`ai_prefix`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/ai_prefix) - [`llm`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/llm) - [`memory_key`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/memory_key) - [`max_token_limit`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/max_token_limit) - [`buffer`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/buffer) - [`buffer_as_str`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/buffer_as_str) - [`buffer_as_messages`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/buffer_as_messages) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/token_buffer/ConversationTokenBufferMemory/memory_variables) - [`memories`](https://reference.langchain.com/python/langchain-classic/memory/combined/CombinedMemory/memories) - [`memory_variables`](https://reference.langchain.com/python/langchain-classic/memory/combined/CombinedMemory/memory_variables) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/kg/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/rocksetdb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/streamlit/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/mongodb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/zep/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/dynamodb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/neo4j/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/xata/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/upstash_redis/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/elasticsearch/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/cosmos_db/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/firestore/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/postgres/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/astradb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/cassandra/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/sql/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/singlestoredb/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/redis/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/file/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/memory/chat_message_histories/momento/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/docstore/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/docstore/arbitrary_fn/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/docstore/base/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/docstore/in_memory/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/docstore/wikipedia/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/indexes/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/indexes/graph/DEPRECATED_LOOKUP) - [`vectorstore`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorStoreIndexWrapper/vectorstore) - [`model_config`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorStoreIndexWrapper/model_config) - [`vectorstore_cls`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorstoreIndexCreator/vectorstore_cls) - [`embedding`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorstoreIndexCreator/embedding) - [`text_splitter`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorstoreIndexCreator/text_splitter) - [`vectorstore_kwargs`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorstoreIndexCreator/vectorstore_kwargs) - [`model_config`](https://reference.langchain.com/python/langchain-classic/indexes/vectorstore/VectorstoreIndexCreator/model_config) - [`Base`](https://reference.langchain.com/python/langchain-classic/indexes/_sql_record_manager/Base) - 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[`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/output_parsers/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/output_parsers/ernie_functions/DEPRECATED_LOOKUP) - [`dataframe`](https://reference.langchain.com/python/langchain-classic/output_parsers/pandas_dataframe/PandasDataFrameOutputParser/dataframe) - [`NAIVE_FIX`](https://reference.langchain.com/python/langchain-classic/output_parsers/prompts/NAIVE_FIX) - [`NAIVE_FIX_PROMPT`](https://reference.langchain.com/python/langchain-classic/output_parsers/prompts/NAIVE_FIX_PROMPT) - [`T`](https://reference.langchain.com/python/langchain-classic/output_parsers/yaml/T) - [`pydantic_object`](https://reference.langchain.com/python/langchain-classic/output_parsers/yaml/YamlOutputParser/pydantic_object) - [`pattern`](https://reference.langchain.com/python/langchain-classic/output_parsers/yaml/YamlOutputParser/pattern) - [`OutputType`](https://reference.langchain.com/python/langchain-classic/output_parsers/yaml/YamlOutputParser/OutputType) - [`enum`](https://reference.langchain.com/python/langchain-classic/output_parsers/enum/EnumOutputParser/enum) - [`OutputType`](https://reference.langchain.com/python/langchain-classic/output_parsers/enum/EnumOutputParser/OutputType) - [`NAIVE_COMPLETION_RETRY`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/NAIVE_COMPLETION_RETRY) - [`NAIVE_COMPLETION_RETRY_WITH_ERROR`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/NAIVE_COMPLETION_RETRY_WITH_ERROR) - [`NAIVE_RETRY_PROMPT`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/NAIVE_RETRY_PROMPT) - [`NAIVE_RETRY_WITH_ERROR_PROMPT`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/NAIVE_RETRY_WITH_ERROR_PROMPT) - [`T`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/T) - [`prompt`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParserRetryChainInput/prompt) - [`completion`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParserRetryChainInput/completion) - [`prompt`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParserRetryChainInput/prompt) - [`completion`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParserRetryChainInput/completion) - [`error`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParserRetryChainInput/error) - [`parser`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParser/parser) - [`retry_chain`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParser/retry_chain) - [`max_retries`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParser/max_retries) - [`legacy`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParser/legacy) - [`OutputType`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryOutputParser/OutputType) - [`parser`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParser/parser) - [`retry_chain`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParser/retry_chain) - [`max_retries`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParser/max_retries) - [`legacy`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParser/legacy) - [`OutputType`](https://reference.langchain.com/python/langchain-classic/output_parsers/retry/RetryWithErrorOutputParser/OutputType) - [`line_template`](https://reference.langchain.com/python/langchain-classic/output_parsers/structured/line_template) - [`name`](https://reference.langchain.com/python/langchain-classic/output_parsers/structured/ResponseSchema/name) - [`description`](https://reference.langchain.com/python/langchain-classic/output_parsers/structured/ResponseSchema/description) - [`type`](https://reference.langchain.com/python/langchain-classic/output_parsers/structured/ResponseSchema/type) - [`response_schemas`](https://reference.langchain.com/python/langchain-classic/output_parsers/structured/StructuredOutputParser/response_schemas) - [`format`](https://reference.langchain.com/python/langchain-classic/output_parsers/datetime/DatetimeOutputParser/format) - [`STRUCTURED_FORMAT_INSTRUCTIONS`](https://reference.langchain.com/python/langchain-classic/output_parsers/format_instructions/STRUCTURED_FORMAT_INSTRUCTIONS) - [`STRUCTURED_FORMAT_SIMPLE_INSTRUCTIONS`](https://reference.langchain.com/python/langchain-classic/output_parsers/format_instructions/STRUCTURED_FORMAT_SIMPLE_INSTRUCTIONS) - [`PYDANTIC_FORMAT_INSTRUCTIONS`](https://reference.langchain.com/python/langchain-classic/output_parsers/format_instructions/PYDANTIC_FORMAT_INSTRUCTIONS) - 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[`completion`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParserRetryChainInput/completion) - [`error`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParserRetryChainInput/error) - [`parser`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParser/parser) - [`retry_chain`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParser/retry_chain) - [`max_retries`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParser/max_retries) - [`legacy`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParser/legacy) - [`OutputType`](https://reference.langchain.com/python/langchain-classic/output_parsers/fix/OutputFixingParser/OutputType) - [`regex`](https://reference.langchain.com/python/langchain-classic/output_parsers/regex/RegexParser/regex) - [`output_keys`](https://reference.langchain.com/python/langchain-classic/output_parsers/regex/RegexParser/output_keys) - 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[`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/google_jobs/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/google_jobs/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/google_scholar/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/google_scholar/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/json/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/gmail/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/gmail/create_draft/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/gmail/base/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/gmail/get_thread/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/gmail/get_message/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/gmail/send_message/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/gmail/search/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/stackexchange/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/google_serper/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/google_serper/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/memorize/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/memorize/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/golden_query/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/golden_query/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/jira/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/e2b_data_analysis/tool/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/file_management/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/file_management/delete/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/file_management/move/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/file_management/copy/DEPRECATED_LOOKUP) - [`DEPRECATED_LOOKUP`](https://reference.langchain.com/python/langchain-classic/tools/file_management/file_search/DEPRECATED_LOOKUP) - 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