# LLMChainFilter

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/LLMChainFilter)

Filter that drops documents that aren't relevant to the query.

## Signature

```python
LLMChainFilter()
```

## Extends

- `BaseDocumentCompressor`

## Properties

- `llm_chain`
- `get_input`
- `model_config`

## Methods

- [`compress_documents()`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/LLMChainFilter/compress_documents)
- [`acompress_documents()`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/LLMChainFilter/acompress_documents)
- [`from_llm()`](https://reference.langchain.com/python/langchain-classic/retrievers/document_compressors/chain_filter/LLMChainFilter/from_llm)

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/311675a517f51ec6c77454124293c58df517e952/libs/langchain/langchain_classic/retrievers/document_compressors/chain_filter.py#L35)