# DistanceStrategy

> **Class** in `langchain_postgres`

📖 [View in docs](https://reference.langchain.com/python/langchain-postgres/v2/indexes/DistanceStrategy)

Enumerator of the Distance strategies.

## Signature

```python
DistanceStrategy(
    self,
    operator: str,
    search_function: str,
    index_function: str,
)
```

## Extends

- `StrategyMixin`
- `enum.Enum`

## Properties

- `EUCLIDEAN`
- `COSINE_DISTANCE`
- `INNER_PRODUCT`

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[View source on GitHub](https://github.com/langchain-ai/langchain-postgres/blob/9d819182da7e3fb1b815e6c9a6b7c2cd1eb4bc0e/langchain_postgres/v2/indexes.py#L21)