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Vectara

This guide will help you getting started with such a retriever backed by a Vectara vector store. For detailed documentation of all features and configurations head to the API reference.

Overview​

A self-query retriever retrieves documents by dynamically generating metadata filters based on some input query. This allows the retriever to account for underlying document metadata in addition to pure semantic similarity when fetching results.

It uses a module called a Translator that generates a filter based on information about metadata fields and the query language that a given vector store supports.

Integration details​

Backing vector storeSelf-hostCloud offeringPackagePy support
VectaraStore❌✅@langchain/community✅

Setup​

Set up a Vectara instance as documented here. Set the following environment variables:

process.env.VECTARA_CUSTOMER_ID = "your_customer_id";
process.env.VECTARA_CORPUS_ID = "your_corpus_id";
process.env.VECTARA_API_KEY = "your-vectara-api-key";

If you want to get automated tracing from individual queries, you can also set your LangSmith API key by uncommenting below:

// process.env.LANGSMITH_API_KEY = "<YOUR API KEY HERE>";
// process.env.LANGSMITH_TRACING = "true";

Installation​

The vector store lives in the @langchain/community package. You’ll also need to install the langchain package to import the main SelfQueryRetriever class.

tip

See this section for general instructions on installing integration packages.

yarn add @langchain/community langchain @langchain/core

Instantiation​

First, initialize your Vectara vector store with some documents that contain metadata:

import { VectaraStore } from "@langchain/community/vectorstores/vectara";
import { Document } from "@langchain/core/documents";
import type { AttributeInfo } from "langchain/chains/query_constructor";

// Vectara provides embeddings
import { FakeEmbeddings } from "@langchain/core/utils/testing";

/**
 * First, we create a bunch of documents. You can load your own documents here instead.
 * Each document has a pageContent and a metadata field. Make sure your metadata matches the AttributeInfo below.
 */
const docs = [
  new Document({
    pageContent:
      "A bunch of scientists bring back dinosaurs and mayhem breaks loose",
    metadata: { year: 1993, rating: 7.7, genre: "science fiction" },
  }),
  new Document({
    pageContent:
      "Leo DiCaprio gets lost in a dream within a dream within a dream within a ...",
    metadata: { year: 2010, director: "Christopher Nolan", rating: 8.2 },
  }),
  new Document({
    pageContent:
      "A psychologist / detective gets lost in a series of dreams within dreams within dreams and Inception reused the idea",
    metadata: { year: 2006, director: "Satoshi Kon", rating: 8.6 },
  }),
  new Document({
    pageContent:
      "A bunch of normal-sized women are supremely wholesome and some men pine after them",
    metadata: { year: 2019, director: "Greta Gerwig", rating: 8.3 },
  }),
  new Document({
    pageContent: "Toys come alive and have a blast doing so",
    metadata: { year: 1995, genre: "animated" },
  }),
  new Document({
    pageContent: "Three men walk into the Zone, three men walk out of the Zone",
    metadata: {
      year: 1979,
      director: "Andrei Tarkovsky",
      genre: "science fiction",
      rating: 9.9,
    },
  }),
];

/**
 * Next, we define the attributes we want to be able to query on.
 * in this case, we want to be able to query on the genre, year, director, rating, and length of the movie.
 * We also provide a description of each attribute and the type of the attribute.
 * This is used to generate the query prompts.
 */
const attributeInfo: AttributeInfo[] = [
  {
    name: "genre",
    description: "The genre of the movie",
    type: "string or array of strings",
  },
  {
    name: "year",
    description: "The year the movie was released",
    type: "number",
  },
  {
    name: "director",
    description: "The director of the movie",
    type: "string",
  },
  {
    name: "rating",
    description: "The rating of the movie (1-10)",
    type: "number",
  },
  {
    name: "length",
    description: "The length of the movie in minutes",
    type: "number",
  },
];

/**
 * Next, we instantiate a vector store. This is where we store the embeddings of the documents.
 * We also need to provide an embeddings object. This is used to embed the documents.
 */
// Vectara provides embeddings
const embeddings = new FakeEmbeddings();
const vectorStore = await VectaraStore.fromDocuments(docs, embeddings, {
  customerId: Number(process.env.VECTARA_CUSTOMER_ID),
  corpusId: Number(process.env.VECTARA_CORPUS_ID),
  apiKey: String(process.env.VECTARA_API_KEY),
});

Now we can instantiate our retriever:

Pick your chat model:

Install dependencies

tip

See this section for general instructions on installing integration packages.

yarn add @langchain/openai

Add environment variables

OPENAI_API_KEY=your-api-key

Instantiate the model

import { ChatOpenAI } from "@langchain/openai";

const llm = new ChatOpenAI({
  model: "gpt-4o-mini",
  temperature: 0
});
import { SelfQueryRetriever } from "langchain/retrievers/self_query";
import { VectaraTranslator } from "@langchain/community/structured_query/vectara";

const selfQueryRetriever = SelfQueryRetriever.fromLLM({
  llm: llm,
  vectorStore: vectorStore,
  /** A short summary of what the document contents represent. */
  documentContents: "Brief summary of a movie",
  attributeInfo: attributeInfo,
  structuredQueryTranslator: new VectaraTranslator(),
});

Usage​

Now, ask a question that requires some knowledge of the document’s metadata to answer. You can see that the retriever will generate the correct result:

await selfQueryRetriever.invoke("Which movies are rated higher than 8.5?");
[
  Document {
    pageContent: 'A psychologist / detective gets lost in a series of dreams within dreams within dreams and Inception reused the idea',
    metadata: { year: 2006, rating: 8.6, director: 'Satoshi Kon' },
    id: undefined
  },
  Document {
    pageContent: 'Three men walk into the Zone, three men walk out of the Zone',
    metadata: {
      year: 1979,
      genre: 'science fiction',
      rating: 9.9,
      director: 'Andrei Tarkovsky'
    },
    id: undefined
  }
]

Use within a chain​

Like other retrievers, Vectara self-query retrievers can be incorporated into LLM applications via chains.

Note that because their returned answers can heavily depend on document metadata, we format the retrieved documents differently to include that information.

import { ChatPromptTemplate } from "@langchain/core/prompts";
import {
  RunnablePassthrough,
  RunnableSequence,
} from "@langchain/core/runnables";
import { StringOutputParser } from "@langchain/core/output_parsers";

import type { Document } from "@langchain/core/documents";

const prompt = ChatPromptTemplate.fromTemplate(`
Answer the question based only on the context provided.

Context: {context}

Question: {question}`);

const formatDocs = (docs: Document[]) => {
  return docs.map((doc) => JSON.stringify(doc)).join("\n\n");
};

// See https://js.langchain.com/v0.2/docs/tutorials/rag
const ragChain = RunnableSequence.from([
  {
    context: selfQueryRetriever.pipe(formatDocs),
    question: new RunnablePassthrough(),
  },
  prompt,
  llm,
  new StringOutputParser(),
]);
await ragChain.invoke("Which movies are rated higher than 8.5?");
The movies rated higher than 8.5 are:

1. The movie directed by Satoshi Kon in 2006, which has a rating of 8.6.
2. The movie directed by Andrei Tarkovsky in 1979, which has a rating of 9.9.

Default search params​

You can also pass a searchParams field into the above method that provides default filters applied in addition to any generated query.

See the official docs for more on how to construct metadata filters.

const selfQueryRetrieverWithDefaultParams = SelfQueryRetriever.fromLLM({
  llm,
  vectorStore,
  documentContents: "Brief summary of a movie",
  attributeInfo,
  /**
   * We need to use a translator that translates the queries into a
   * filter format that the vector store can understand. LangChain provides one here.
   */
  structuredQueryTranslator: new VectaraTranslator(),
  searchParams: {
    filter: {
      filter: "( doc.genre = 'science fiction' ) and ( doc.rating > 8.5 )",
    },
    mergeFiltersOperator: "and",
  },
});

API reference​

For detailed documentation of all Vectara self-query retriever features and configurations head to the API reference.

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