Deprecated

This class will be removed in 0.3.0. See below for an example implementation using createRetrievalChain: Class representing a chain for performing question-answering tasks with a retrieval component.

Example

import { createStuffDocumentsChain } from "langchain/chains/combine_documents";
import { ChatPromptTemplate } from "@langchain/core/prompts";
import { createRetrievalChain } from "langchain/chains/retrieval";
import { MemoryVectorStore } from "langchain/vectorstores/memory";

const documents = [...your documents here];
const embeddings = ...your embeddings model;
const llm = ...your LLM model;

const vectorstore = await MemoryVectorStore.fromDocuments(
documents,
embeddings
);
const prompt = ChatPromptTemplate.fromTemplate(`Answer the user's question: {input}`);

const combineDocsChain = await createStuffDocumentsChain({
llm,
prompt,
});
const retriever = vectorstore.asRetriever();

const retrievalChain = await createRetrievalChain({
combineDocsChain,
retriever,
});

Hierarchy (view full)

Implements

Constructors

Properties

combineDocumentsChain: BaseChain<ChainValues, ChainValues>
inputKey: string = "query"
retriever: BaseRetrieverInterface<Record<string, any>>
returnSourceDocuments: boolean = false
memory?: BaseMemory

Accessors

Methods

  • Parameters

    • inputs: ChainValues[]
    • Optional config: (RunnableConfig | CallbackManager | (BaseCallbackHandler | BaseCallbackHandlerMethodsClass)[])[]

    Returns Promise<ChainValues[]>

    ⚠️ Deprecated ⚠️

    Use .batch() instead. Will be removed in 0.2.0.

    This feature is deprecated and will be removed in the future.

    It is not recommended for use.

    Call the chain on all inputs in the list

  • Parameters

    • values: ChainValues & {
          signal?: AbortSignal;
          timeout?: number;
      }
    • Optional config: RunnableConfig | CallbackManager | (BaseCallbackHandler | BaseCallbackHandlerMethodsClass)[]
    • Optional tags: 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.

  • Invoke the chain with the provided input and returns the output.

    Parameters

    • input: ChainValues

      Input values for the chain run.

    • Optional options: RunnableConfig

    Returns Promise<ChainValues>

    Promise that resolves with the output of the chain run.

  • Parameters

    • inputs: Record<string, unknown>
    • outputs: Record<string, unknown>
    • returnOnlyOutputs: boolean = false

    Returns Promise<Record<string, unknown>>

  • Parameters

    • input: any
    • Optional config: RunnableConfig | CallbackManager | (BaseCallbackHandler | BaseCallbackHandlerMethodsClass)[]

    Returns Promise<string>

    Deprecated

    Use .invoke() instead. Will be removed in 0.2.0.

  • Creates a new instance of RetrievalQAChain using a BaseLanguageModel and a BaseRetriever.

    Parameters

    • llm: BaseLanguageModelInterface<any, BaseLanguageModelCallOptions>

      The BaseLanguageModel used to generate a new question.

    • retriever: BaseRetrieverInterface<Record<string, any>>

      The BaseRetriever used to retrieve relevant documents.

    • Optional options: Partial<Omit<RetrievalQAChainInput, "retriever" | "index" | "combineDocumentsChain">> & StuffQAChainParams

      Optional parameters for the RetrievalQAChain.

    Returns RetrievalQAChain

    A new instance of RetrievalQAChain.

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