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BatchNormalizationOrthogonalizesRepresentations inDeepRandomNetworks

Neural Information Processing Systems

More precisely, under a mild assumption, we prove that the deviation of the representations from orthogonality rapidly decays with depth up to a term inversely proportional to the network width. This result has two main implications: 1) Theoretically, as the depth grows, the distribution of the representation -after the linear layers-contracts to a Wasserstein-2 ball around an isotropic Gaussian distribution.