Class MapReduceDocumentsChain

Combine documents by mapping a chain over them, then combining results.

Hierarchy (View Summary)

BaseChain
- MapReduceDocumentsChain

Implements

MapReduceDocumentsChainInput

Index

Constructors

constructor

new MapReduceDocumentsChain(
fields: MapReduceDocumentsChainInput,
): MapReduceDocumentsChain
Parameters
- fields: MapReduceDocumentsChainInput
Returns MapReduceDocumentsChain
Overrides BaseChain.constructor
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/combine_docs_chain.ts:163

Properties

combineDocumentChain

combineDocumentChain: StuffDocumentsChain

Chain to use to combine results of applying llm_chain to documents.

documentVariableName

documentVariableName: string = "context"

Variable name in the LLM chain to put the documents in

ensureMapStep

ensureMapStep: boolean = false

Ensures that the map step is taken regardless of max tokens

inputKey

inputKey: string = "input_documents"

llmChain

llmChain: LLMChain

LLM Wrapper to use after formatting documents

maxIterations

maxIterations: number = 10

The maximum number of iterations to run through the map

maxTokens

maxTokens: number = 3000

The maximum number of tokens before requiring to do the reduction

`Optional`memory

memory?: any

returnIntermediateSteps

returnIntermediateSteps: boolean = false

Return the results of the map steps in the output.

Accessors

inputKeys

get inputKeys(): any[]
Returns any[]
Overrides BaseChain.inputKeys
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/combine_docs_chain.ts:147

lc_namespace

get lc_namespace(): string[]
Returns string[]
Inherited from BaseChain.lc_namespace
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/base.ts:41

outputKeys

get outputKeys(): string[]
Returns string[]
Overrides BaseChain.outputKeys
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/combine_docs_chain.ts:151

Methods

_chainType

_chainType(): "map_reduce_documents_chain"
Return the string type key uniquely identifying this class of chain.

Returns "map_reduce_documents_chain"
Overrides BaseChain._chainType
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/combine_docs_chain.ts:261

`Protected`_formatValues

_formatValues(values: any): Promise<any>
Parameters
- values: any
Returns Promise<any>
Inherited from BaseChain._formatValues
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/base.ts:217

apply

apply(inputs: ChainValues[], config?: any[]): Promise<ChainValues[]>
Parameters
- inputs: ChainValues[]
- Optionalconfig: any[]
Returns Promise<ChainValues[]>
Deprecated
Use .batch() instead. Will be removed in 0.2.0.

Call the chain on all inputs in the list
Inherited from BaseChain.apply
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/base.ts:258

call

call(values: any, config?: any, tags?: string[]): Promise<ChainValues>
Parameters
- values: any
- Optionalconfig: any
- Optionaltags: string[]
  Deprecated
Returns Promise<ChainValues>
Deprecated
Use .invoke() instead. Will be removed in 0.2.0.

Run the core logic of this chain and add to output if desired.

Wraps _call and handles memory.
Inherited from BaseChain.call
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/base.ts:243

invoke

invoke(input: ChainValues, options?: any): Promise<ChainValues>
Invoke the chain with the provided input and returns the output.
Parameters
- input: ChainValues
  Input values for the chain run.
- Optionaloptions: any
Returns Promise<ChainValues>
Promise that resolves with the output of the chain run.
Inherited from BaseChain.invoke
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/base.ts:86

prepOutputs

prepOutputs(
    inputs: Record<string, unknown>,
    outputs: Record<string, unknown>,
    returnOnlyOutputs?: boolean,
): Promise<Record<string, unknown>>
Parameters
- inputs: Record<string, unknown>
- outputs: Record<string, unknown>
- returnOnlyOutputs: boolean = false
Returns Promise<Record<string, unknown>>
Inherited from BaseChain.prepOutputs
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/base.ts:149

run

run(input: any, config?: any): Promise<string>
Parameters
- input: any
- Optionalconfig: any
Returns Promise<string>
Deprecated
Use .invoke() instead. Will be removed in 0.2.0.
Inherited from BaseChain.run
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/base.ts:190

serialize

serialize(): SerializedMapReduceDocumentsChain
Return a json-like object representing this chain.

Returns SerializedMapReduceDocumentsChain
Overrides BaseChain.serialize
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/combine_docs_chain.ts:282

`Static`deserialize

deserialize(
data: SerializedMapReduceDocumentsChain,
): Promise<MapReduceDocumentsChain>
Load a chain from a json-like object describing it.
Parameters
- data: SerializedMapReduceDocumentsChain
Returns Promise<MapReduceDocumentsChain>
Overrides BaseChain.deserialize
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/combine_docs_chain.ts:265

`Static`lc_name

lc_name(): string
Returns string
- Defined in remotes/langchain-ai/langchainjs/main/libs/langchain-classic/src/chains/combine_docs_chain.ts:135

Class MapReduceDocumentsChain

Hierarchy (View Summary)

Implements

Index

Constructors

Properties

Accessors

Methods

Constructors

constructor

Parameters

Returns MapReduceDocumentsChain

Properties

combineDocumentChain

documentVariableName

ensureMapStep

inputKey

llmChain

maxIterations

maxTokens

Optionalmemory

returnIntermediateSteps

Accessors

inputKeys

Returns any[]

lc_namespace

Returns string[]

outputKeys

Returns string[]

Methods

_chainType

Returns "map_reduce_documents_chain"

Protected_formatValues

Parameters

Returns Promise<any>

apply

Parameters

Returns Promise<ChainValues[]>

Deprecated

call

Parameters

Deprecated

Returns Promise<ChainValues>

Deprecated

invoke

Parameters

Returns Promise<ChainValues>

prepOutputs

Parameters

Returns Promise<Record<string, unknown>>

run

Parameters

Returns Promise<string>

Deprecated

serialize

Returns SerializedMapReduceDocumentsChain

Staticdeserialize

Parameters

Returns Promise<MapReduceDocumentsChain>

Staticlc_name

Returns string

Settings

On This Page

`Optional`memory

`Protected`_formatValues

`Static`deserialize

`Static`lc_name