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Cartesian k-means for approximate nearest neghbor search, codebook learning, etc.

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https://github.com/norouzi/ckmeans/blob/fa320e8504c18947a5f67ba21d055306c9aabf4c/itq/ITQ.m#L31 Hello, I think this line is different from the ITQ paper and it should be `R = UA' * UB'; ` You could derive the math according to https://en.wikipedia.org/wiki/Orthogonal_Procrustes_problem.