# IVFFlat

> **Class** in `langchain_azure_postgresql`

📖 [View in docs](https://reference.langchain.com/python/langchain-azure-postgresql/common/_shared/IVFFlat)

IVF-Flat algorithm settings.

Provides build-time and (via :class:`IVFFlatSearchParams`) search-time
parameters for IVF-Flat vector indexes.

:param lists: The number of inverted lists to use for IVF-Flat indexing.
:type lists: PositiveInt | None

## Signature

```python
IVFFlat()
```

## Extends

- `Algorithm[IVFFlatSearchParams]`

## Properties

- `lists`

## Methods

- [`build_settings()`](https://reference.langchain.com/python/langchain-azure-postgresql/common/_shared/IVFFlat/build_settings)
- [`default_search_params()`](https://reference.langchain.com/python/langchain-azure-postgresql/common/_shared/IVFFlat/default_search_params)

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[View source on GitHub](https://github.com/langchain-ai/langchain-azure/blob/607b649e909f217be20d7a50804ca11534c08eea/libs/azure-postgresql/src/langchain_azure_postgresql/common/_shared.py#L538)