# MultiQueryRetriever

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever)

Given a query, use an LLM to write a set of queries.

Retrieve docs for each query. Return the unique union of all retrieved docs.

## Signature

```python
MultiQueryRetriever()
```

## Extends

- `BaseRetriever`

## Properties

- `retriever`
- `llm_chain`
- `verbose`
- `parser_key`
- `include_original`

## Methods

- [`from_llm()`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/from_llm)
- [`agenerate_queries()`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/agenerate_queries)
- [`aretrieve_documents()`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/aretrieve_documents)
- [`generate_queries()`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/generate_queries)
- [`retrieve_documents()`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/retrieve_documents)
- [`unique_union()`](https://reference.langchain.com/python/langchain-classic/retrievers/multi_query/MultiQueryRetriever/unique_union)

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/02991cb4cf2063d51a07268edafb05fe53de1826/libs/langchain/langchain_classic/retrievers/multi_query.py#L49)