Class for performing document retrieval from a VectorStore. Can perform similarity search or maximal marginal relevance search.

Type Parameters

Hierarchy

Constructors

Properties

k: number = 4
kIncrement: number = 10
maxK: number = 100
minSimilarityScore: number
searchType: string = "similarity"
vectorStore: V
callbacks?: Callbacks
filter?: V["FilterType"]
metadata?: Record<string, unknown>
tags?: string[]
verbose?: boolean

Methods

  • Main method used to retrieve relevant documents. It takes a query string and an optional configuration object, and returns a promise that resolves to an array of Document objects. This method handles the retrieval process, including starting and ending callbacks, and error handling.

    Parameters

    • query: string

      The query string to retrieve relevant documents for.

    Returns Promise<Document<Record<string, any>>[]>

    A promise that resolves to an array of Document objects.

  • Create a new runnable sequence that runs each individual runnable in series, piping the output of one runnable into another runnable or runnable-like.

    Type Parameters

    • NewRunOutput

    Parameters

    • coerceable: RunnableLike<Document<Record<string, any>>[], NewRunOutput>

      A runnable, function, or object whose values are functions or runnables.

    Returns RunnableSequence<string, Exclude<NewRunOutput, Error>>

    A new runnable sequence.

  • Stream all output from a runnable, as reported to the callback system. This includes all inner runs of LLMs, Retrievers, Tools, etc. Output is streamed as Log objects, which include a list of jsonpatch ops that describe how the state of the run has changed in each step, and the final state of the run. The jsonpatch ops can be applied in order to construct state.

    Parameters

    • input: string
    • Optional options: Partial<BaseCallbackConfig>
    • Optional streamOptions: Omit<LogStreamCallbackHandlerInput, "autoClose">

    Returns AsyncGenerator<RunLogPatch, any, unknown>

  • Default implementation of transform, which buffers input and then calls stream. Subclasses should override this method if they can start producing output while input is still being generated.

    Parameters

    Returns AsyncGenerator<Document<Record<string, any>>[], any, unknown>

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