from_llm

from_llm(
  cls,
  llm: BaseLanguageModel,
  vectorstore: VectorStore,
  condense_question_prompt: BasePromptTemplate = CONDENSE_QUESTION_PROMPT,
  chain_type: str = 'stuff',
  combine_docs_chain_kwargs: dict | None = None,
  callbacks: Callbacks = None,
  **kwargs: Any = {}
) -> BaseConversationalRetrievalChain