v1.7.3

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)