Class for interacting with Amazon Kendra, an intelligent search service provided by AWS. Extends the BaseRetriever class.

const retriever = new AmazonKendraRetriever({
topK: 10,
indexId: "YOUR_INDEX_ID",
region: "us-east-2",
clientOptions: {
credentials: {
accessKeyId: "YOUR_ACCESS_KEY_ID",
secretAccessKey: "YOUR_SECRET_ACCESS_KEY",
},
},
});

const docs = await retriever.getRelevantDocuments("How are clouds formed?");

Hierarchy

  • BaseRetriever
    • AmazonKendraRetriever

Constructors

Properties

attributeFilter?: AttributeFilter
callbacks?: Callbacks
indexId: string
kendraClient: KendraClient
metadata?: Record<string, unknown>
name?: string
tags?: string[]
topK: number
verbose?: boolean

Methods

  • Convert a runnable to a tool. Return a new instance of RunnableToolLike which contains the runnable, name, description and schema.

    Type Parameters

    • T extends string = string

    Parameters

    • fields: {
          description?: string;
          name?: string;
          schema: ZodType<T, ZodTypeDef, T>;
      }
      • Optionaldescription?: string

        The description of the tool. Falls back to the description on the Zod schema if not provided, or undefined if neither are provided.

      • Optionalname?: string

        The name of the tool. If not provided, it will default to the name of the runnable.

      • schema: ZodType<T, ZodTypeDef, T>

        The Zod schema for the input of the tool. Infers the Zod type from the input type of the runnable.

    Returns RunnableToolLike<ZodType<ToolCall | T, ZodTypeDef, ToolCall | T>, DocumentInterface<Record<string, any>>[]>

    An instance of RunnableToolLike which is a runnable that can be used as a tool.

  • Assigns new fields to the dict output of this runnable. Returns a new runnable.

    Parameters

    • mapping: RunnableMapLike<Record<string, unknown>, Record<string, unknown>>

    Returns Runnable<any, any, RunnableConfig<Record<string, any>>>

  • Default implementation of batch, which calls invoke N times. Subclasses should override this method if they can batch more efficiently.

    Parameters

    • inputs: string[]

      Array of inputs to each batch call.

    • Optionaloptions: Partial<RunnableConfig<Record<string, any>>> | Partial<RunnableConfig<Record<string, any>>>[]

      Either a single call options object to apply to each batch call or an array for each call.

    • OptionalbatchOptions: RunnableBatchOptions & {
          returnExceptions?: false;
      }

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

    An array of RunOutputs, or mixed RunOutputs and errors if batchOptions.returnExceptions is set

  • Parameters

    • inputs: string[]
    • Optionaloptions: Partial<RunnableConfig<Record<string, any>>> | Partial<RunnableConfig<Record<string, any>>>[]
    • OptionalbatchOptions: RunnableBatchOptions & {
          returnExceptions: true;
      }

    Returns Promise<(Error | DocumentInterface<Record<string, any>>[])[]>

  • Parameters

    • inputs: string[]
    • Optionaloptions: Partial<RunnableConfig<Record<string, any>>> | Partial<RunnableConfig<Record<string, any>>>[]
    • OptionalbatchOptions: RunnableBatchOptions

    Returns Promise<(Error | DocumentInterface<Record<string, any>>[])[]>

  • Bind arguments to a Runnable, returning a new Runnable.

    Parameters

    • kwargs: Partial<RunnableConfig<Record<string, any>>>

    Returns Runnable<string, DocumentInterface<Record<string, any>>[], RunnableConfig<Record<string, any>>>

    A new RunnableBinding that, when invoked, will apply the bound args.

  • Cleans the result text by replacing sequences of whitespace with a single space and removing ellipses.

    Parameters

    • resText: string

      The result text to clean.

    Returns string

    The cleaned result text.

  • Combines title and excerpt into a single string.

    Parameters

    • Optionaltitle: string

      The title of the document.

    • Optionalexcerpt: string

      An excerpt from the document.

    Returns string

    A single string combining the title and excerpt.

  • Converts a QueryResultItem object into a Document object.

    Parameters

    • item: QueryResultItem

      The QueryResultItem object to convert.

    Returns Document<{
        document_attributes: {
            [key: string]: unknown;
        };
        excerpt: string;
        source: undefined | string;
        title: string;
    }>

    A Document object.

  • Converts a RetrieveResultItem object into a Document object.

    Parameters

    • item: RetrieveResultItem

      The RetrieveResultItem object to convert.

    Returns Document<{
        document_attributes: {
            [key: string]: unknown;
        };
        excerpt: string;
        source: undefined | string;
        title: string;
    }>

    A Document object.

  • Extracts the attribute value from a DocumentAttributeValue object.

    Parameters

    • value: DocumentAttributeValue

      The DocumentAttributeValue object to extract the value from.

    Returns
        | string
        | number
        | string[]
        | Date

    The extracted attribute value.

  • Extracts the attribute key-value pairs from an array of DocumentAttribute objects.

    Parameters

    • OptionaldocumentAttributes: DocumentAttribute[]

      The array of DocumentAttribute objects to extract the key-value pairs from.

    Returns {
        [key: string]: unknown;
    }

    An object containing the extracted attribute key-value pairs.

    • [key: string]: unknown
  • Parameters

    • Optional_: RunnableConfig<Record<string, any>>

    Returns Graph

  • Parameters

    • Optionalsuffix: string

    Returns string

  • Extracts the top-k documents from a QueryCommandOutput object.

    Parameters

    • response: QueryCommandOutput

      The QueryCommandOutput object to extract the documents from.

    • pageSize: number

      The number of documents to extract.

    Returns Document<{
        document_attributes: {
            [key: string]: unknown;
        };
        excerpt: string;
        source: undefined | string;
        title: string;
    }>[]

    An array of Document objects.

  • Extracts the excerpt text from a QueryResultItem object.

    Parameters

    • item: QueryResultItem

      The QueryResultItem object to extract the excerpt text from.

    Returns string

    The extracted excerpt text.

  • Parameters

    • query: string

      The query string to retrieve relevant documents for.

    • Optionalconfig: BaseCallbackConfig | Callbacks

      Optional configuration object for the retrieval process.

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

    A promise that resolves to an array of Document objects.

    Use .invoke() instead. Will be removed in 0.3.0.

    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.

  • Extracts the top-k documents from a RetrieveCommandOutput object.

    Parameters

    • response: RetrieveCommandOutput

      The RetrieveCommandOutput object to extract the documents from.

    • pageSize: number

      The number of documents to extract.

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

    An array of Document objects.

  • Parameters

    • input: string
    • Optionaloptions: RunnableConfig<Record<string, any>>

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

  • Return a new Runnable that maps a list of inputs to a list of outputs, by calling invoke() with each input.

    Returns Runnable<string[], DocumentInterface<Record<string, any>>[][], RunnableConfig<Record<string, any>>>

  • Pick keys from the dict output of this runnable. Returns a new runnable.

    Parameters

    • keys: string | string[]

    Returns Runnable<any, any, RunnableConfig<Record<string, any>>>

  • 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<DocumentInterface<Record<string, any>>[], NewRunOutput, RunnableConfig<Record<string, any>>>

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

    Returns Runnable<string, Exclude<NewRunOutput, Error>, RunnableConfig<Record<string, any>>>

    A new runnable sequence.

  • Sends a retrieve or query request to Kendra and returns the top-k documents.

    Parameters

    • query: string

      The query to send to Kendra.

    • topK: number

      The number of top documents to return.

    • OptionalattributeFilter: AttributeFilter

      Optional filter to apply when retrieving documents.

    Returns Promise<Document<Record<string, any>>[] | Document<{
        document_attributes: {
            [key: string]: unknown;
        };
        excerpt: string;
        source: undefined | string;
        title: string;
    }>[]>

    A Promise that resolves to an array of Document objects.

  • Stream output in chunks.

    Parameters

    • input: string
    • Optionaloptions: Partial<RunnableConfig<Record<string, any>>>

    Returns Promise<IterableReadableStream<DocumentInterface<Record<string, any>>[]>>

    A readable stream that is also an iterable.

  • Generate a stream of events emitted by the internal steps of the runnable.

    Use to create an iterator over StreamEvents that provide real-time information about the progress of the runnable, including StreamEvents from intermediate results.

    A StreamEvent is a dictionary with the following schema:

    • event: string - Event names are of the format: on_[runnable_type]_(start|stream|end).
    • name: string - The name of the runnable that generated the event.
    • run_id: string - Randomly generated ID associated with the given execution of the runnable that emitted the event. A child runnable that gets invoked as part of the execution of a parent runnable is assigned its own unique ID.
    • tags: string[] - The tags of the runnable that generated the event.
    • metadata: Record<string, any> - The metadata of the runnable that generated the event.
    • data: Record<string, any>

    Below is a table that illustrates some events that might be emitted by various chains. Metadata fields have been omitted from the table for brevity. Chain definitions have been included after the table.

    ATTENTION This reference table is for the V2 version of the schema.

    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | event                | name             | chunk                           | input                                         | output                                          |
    +======================+==================+=================================+===============================================+=================================================+
    | on_chat_model_start  | [model name]     |                                 | {"messages": [[SystemMessage, HumanMessage]]} |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_chat_model_stream | [model name]     | AIMessageChunk(content="hello") |                                               |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_chat_model_end    | [model name]     |                                 | {"messages": [[SystemMessage, HumanMessage]]} | AIMessageChunk(content="hello world")           |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_llm_start         | [model name]     |                                 | {'input': 'hello'}                            |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_llm_stream        | [model name]     | 'Hello'                         |                                               |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_llm_end           | [model name]     |                                 | 'Hello human!'                                |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_chain_start       | some_runnable    |                                 |                                               |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_chain_stream      | some_runnable    | "hello world!, goodbye world!"  |                                               |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_chain_end         | some_runnable    |                                 | [Document(...)]                               | "hello world!, goodbye world!"                  |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_tool_start        | some_tool        |                                 | {"x": 1, "y": "2"}                            |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_tool_end          | some_tool        |                                 |                                               | {"x": 1, "y": "2"}                              |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_retriever_start   | [retriever name] |                                 | {"query": "hello"}                            |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_retriever_end     | [retriever name] |                                 | {"query": "hello"}                            | [Document(...), ..]                             |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_prompt_start      | [template_name]  |                                 | {"question": "hello"}                         |                                                 |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    | on_prompt_end        | [template_name]  |                                 | {"question": "hello"}                         | ChatPromptValue(messages: [SystemMessage, ...]) |
    +----------------------+------------------+---------------------------------+-----------------------------------------------+-------------------------------------------------+
    

    The "on_chain_*" events are the default for Runnables that don't fit one of the above categories.

    In addition to the standard events above, users can also dispatch custom events.

    Custom events will be only be surfaced with in the v2 version of the API!

    A custom event has following format:

    +-----------+------+-----------------------------------------------------------------------------------------------------------+
    | Attribute | Type | Description                                                                                               |
    +===========+======+===========================================================================================================+
    | name      | str  | A user defined name for the event.                                                                        |
    +-----------+------+-----------------------------------------------------------------------------------------------------------+
    | data      | Any  | The data associated with the event. This can be anything, though we suggest making it JSON serializable.  |
    +-----------+------+-----------------------------------------------------------------------------------------------------------+
    

    Here's an example:

    import { RunnableLambda } from "@langchain/core/runnables";
    import { dispatchCustomEvent } from "@langchain/core/callbacks/dispatch";
    // Use this import for web environments that don't support "async_hooks"
    // and manually pass config to child runs.
    // import { dispatchCustomEvent } from "@langchain/core/callbacks/dispatch/web";

    const slowThing = RunnableLambda.from(async (someInput: string) => {
    // Placeholder for some slow operation
    await new Promise((resolve) => setTimeout(resolve, 100));
    await dispatchCustomEvent("progress_event", {
    message: "Finished step 1 of 2",
    });
    await new Promise((resolve) => setTimeout(resolve, 100));
    return "Done";
    });

    const eventStream = await slowThing.streamEvents("hello world", {
    version: "v2",
    });

    for await (const event of eventStream) {
    if (event.event === "on_custom_event") {
    console.log(event);
    }
    }

    Parameters

    • input: string
    • options: Partial<RunnableConfig<Record<string, any>>> & {
          version: "v1" | "v2";
      }
    • OptionalstreamOptions: Omit<EventStreamCallbackHandlerInput, "autoClose">

    Returns IterableReadableStream<StreamEvent>

  • Parameters

    • input: string
    • options: Partial<RunnableConfig<Record<string, any>>> & {
          encoding: "text/event-stream";
          version: "v1" | "v2";
      }
    • OptionalstreamOptions: Omit<EventStreamCallbackHandlerInput, "autoClose">

    Returns IterableReadableStream<Uint8Array>

  • 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
    • Optionaloptions: Partial<RunnableConfig<Record<string, any>>>
    • OptionalstreamOptions: Omit<LogStreamCallbackHandlerInput, "autoClose">

    Returns AsyncGenerator<RunLogPatch, any, unknown>

  • Returns Serialized

  • 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

    • generator: AsyncGenerator<string, any, unknown>
    • options: Partial<RunnableConfig<Record<string, any>>>

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

  • Bind config to a Runnable, returning a new Runnable.

    Parameters

    • config: RunnableConfig<Record<string, any>>

      New configuration parameters to attach to the new runnable.

    Returns RunnableBinding<string, DocumentInterface<Record<string, any>>[], RunnableConfig<Record<string, any>>>

    A new RunnableBinding with a config matching what's passed.

  • Create a new runnable from the current one that will try invoking other passed fallback runnables if the initial invocation fails.

    Parameters

    • fields: {
          fallbacks: Runnable<string, DocumentInterface<Record<string, any>>[], RunnableConfig<Record<string, any>>>[];
      } | Runnable<string, DocumentInterface<Record<string, any>>[], RunnableConfig<Record<string, any>>>[]

    Returns RunnableWithFallbacks<string, DocumentInterface<Record<string, any>>[]>

    A new RunnableWithFallbacks.

  • Bind lifecycle listeners to a Runnable, returning a new Runnable. The Run object contains information about the run, including its id, type, input, output, error, startTime, endTime, and any tags or metadata added to the run.

    Parameters

    • params: {
          onEnd?: ((run: Run, config?: RunnableConfig<Record<string, any>>) => void | Promise<void>);
          onError?: ((run: Run, config?: RunnableConfig<Record<string, any>>) => void | Promise<void>);
          onStart?: ((run: Run, config?: RunnableConfig<Record<string, any>>) => void | Promise<void>);
      }

      The object containing the callback functions.

      • OptionalonEnd?: ((run: Run, config?: RunnableConfig<Record<string, any>>) => void | Promise<void>)

        Called after the runnable finishes running, with the Run object.

          • (run, config?): void | Promise<void>
          • Parameters

            • run: Run
            • Optionalconfig: RunnableConfig<Record<string, any>>

            Returns void | Promise<void>

      • OptionalonError?: ((run: Run, config?: RunnableConfig<Record<string, any>>) => void | Promise<void>)

        Called if the runnable throws an error, with the Run object.

          • (run, config?): void | Promise<void>
          • Parameters

            • run: Run
            • Optionalconfig: RunnableConfig<Record<string, any>>

            Returns void | Promise<void>

      • OptionalonStart?: ((run: Run, config?: RunnableConfig<Record<string, any>>) => void | Promise<void>)

        Called before the runnable starts running, with the Run object.

          • (run, config?): void | Promise<void>
          • Parameters

            • run: Run
            • Optionalconfig: RunnableConfig<Record<string, any>>

            Returns void | Promise<void>

    Returns Runnable<string, DocumentInterface<Record<string, any>>[], RunnableConfig<Record<string, any>>>

  • Add retry logic to an existing runnable.

    Parameters

    • Optionalfields: {
          onFailedAttempt?: RunnableRetryFailedAttemptHandler;
          stopAfterAttempt?: number;
      }
      • OptionalonFailedAttempt?: RunnableRetryFailedAttemptHandler
      • OptionalstopAfterAttempt?: number

    Returns RunnableRetry<string, DocumentInterface<Record<string, any>>[], RunnableConfig<Record<string, any>>>

    A new RunnableRetry that, when invoked, will retry according to the parameters.

  • Parameters

    • thing: any

    Returns thing is Runnable<any, any, RunnableConfig<Record<string, any>>>