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Open Source Library
Summary
hnswlib is an open‑source header‑only C++ library with Python bindings that provides fast approximate nearest neighbor search using the HNSW algorithm.
Highlights
- Header‑only C++ core (C++11) with official Python bindings; other languages via community wrappers
- Supports incremental index building, deletions, filtering, custom distance functions and multithreaded queries
- Low memory footprint and fast build times compared to similar libraries such as nmslib
- Python indices are picklable for easy serialization
- Recent updates added multi‑vector document search and epsilon search in C++
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Context
Audience
Developers and researchers who need a lightweight, high performance ANN library for C++ or Python projects
DomainApproximate Nearest Neighbor Search
Formatsource code repository on GitHub with documentation and examples
Accessopen source, free to use under the Apache‑2.0 license
Topics
Related
FAISSAnnoynmslibMilvusVespa