retriever.md

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Retriever

A retriever in LlamaIndex is what is used to fetch Nodes from an index using a query string. Aa VectorIndexRetriever will fetch the top-k most similar nodes. Meanwhile, a SummaryIndexRetriever will fetch all nodes no matter the query.

const retriever = vector_index.asRetriever();
retriever.topK = { TEXT: 3, IMAGE: 1 };

// Fetch nodes!
const nodesWithScore = await retriever.retrieve({ query: "query string" });

API Reference

• SummaryIndexRetriever
• SummaryIndexLLMRetriever
• VectorIndexRetriever