From what I can tell, this is a machine learning based approximation to matrix multiplication by a particular matrix (which it was trained on). It trades accura

From what I can tell, this is a machine learning based approximation to matrix multiplication by a particular matrix (which it was trained on). It trades accuracy for speed. If you need to multiply many (many!) vectors by a static matrix and you have loose enough error tolerance, this can provide up to 100x speedup.