langchain/docs/integrations/annoy.md

# Annoy

> [Annoy](https://github.com/spotify/annoy) (`Approximate Nearest Neighbors Oh Yeah`) is a C++ library with Python bindings to search for points in space that are close to a given query point. It also creates large read-only file-based data structures that are mmapped into memory so that many processes may share the same data. 
## Installation and Setup


```bash
pip install annoy
```


## Vectorstore

See a [usage example](../modules/indexes/vectorstores/examples/annoy.ipynb).

```python
from langchain.vectorstores import Annoy
```