# HNSWConfig

> **Class** in `langgraph.store.postgres`

📖 [View in docs](https://reference.langchain.com/python/langgraph.store.postgres/base/HNSWConfig)

Configuration for HNSW (Hierarchical Navigable Small World) index.

## Signature

```python
HNSWConfig()
```

## Extends

- `ANNIndexConfig`

## Properties

- `kind`
- `m`
- `ef_construction`

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[View source on GitHub](https://github.com/langchain-ai/langgraph/blob/aa322c13cd5f16a3f6254a931a4104e412cd687c/libs/checkpoint-postgres/langgraph/store/postgres/base.py#L190)