The basic idea of product quantization is 10 years old now and there are many examples out there [0][1][2][etc]. This looks like a high quality library though.

The basic idea of product quantization is 10 years old now and there are many examples out there [0][1][2][etc]. This looks like a high quality library though. [0] https://github.com/yahoo/lopq https://github.com/yahoo/lopq [1] https://github.com/cgtuebingen/Product-Quantization-Tree https://github.com/cgtuebingen/Product-Quantization-Tree [2] https://github.com/technicolor-research/pq-fast-scan https://github.com/technicolor-research/pq-fast-scan [3] https://github.com/matsui528/rii https://github.com/matsui528/rii