PQ Centroid Optimization implement

[592375753]

hi, jingtaozhan,I am glad to read your paper.However,I don't find the code of PQ Centroid Optimization in the paper.Maybe I misunderstood your paper or code.

[jingtaozhan]

Hi, Danfeng. This section illustrates how PQ centroids are updated with gradient descent at each training step. In our implementation, this step is automatically done by the optimizer and we do not need to explicitly write the code.