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The Deep Cauchy Hashing Network (DCH) seeks to improve hash quality by penalizing similar image pairs having a Hamming Distance bigger than the radius specified by the hashing network (Cao et al., 2018). The authors argue that hashing networks tend to concentrate related images within a specified Hamming ball due to mis-specified loss function. By penalizing the network for when this happens with a pairwise cross-entropy loss based on a Cauchy distribution, the rankings become stronger....
