Added
- Sparse k-means routines and moved the generic kmeans to contrib
- FlatDistanceComputer for all FlatCodes indexes
- Support for fast accumulation of 4-bit LSQ and RQ
- Product additive quantization support
- Support per-query search parameters for many indexes + filtering by ids
- write_VectorTransform and read_vectorTransform were added to the public API (by @AbdelrahmanElmeniawy)
- Support for IDMap2 in index_factory by adding "IDMap2" to prefix or suffix of the input String (by @AbdelrahmanElmeniawy)
- Support for merging all IndexFlatCodes descendants (by @AbdelrahmanElmeniawy)
- Remove and merge features for IndexFastScan (by @AbdelrahmanElmeniawy)
- Performance improvements: 1) specialized the AVX2 pieces of code speeding up certain hotspots, 2) specialized kernels for vector codecs (this can be found in faiss/cppcontrib)
Fixed
- Fixed memory leak in OnDiskInvertedLists::do_mmap when the file is not closed (by @AbdelrahmanElmeniawy)
- LSH correctly throws error for metric types other than METRIC_L2 (by @AbdelrahmanElmeniawy)