An implementation of the HNSW index for approximate nearest neighbors search for C++14, that supports incremental insertion and removal of elements.

Original parts of this project are licensed under the terms of the Apache 2.0 license. This project also includes:

• A copy of the hopscotch-map project, which is licensed under the MIT license. It resides in include/hnsw/containers/hopscotch-map-1.4.0.
• Parts of nmslib, which are also licensed under the Apache 2.0 license.

Individual source files have corresponding copyright and license info.

• Malkov, Y.A., Yashunin, D.A. Efficient and robust approximate nearest neighbor search using Hierarchical Navigable Small World graphs