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Scaleable input gradient regularization for adversarial robustness
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In this work we revisit gradient regularization for adversarial robustness with some new ingredients. First, we derive new per-image theoretical robustness bounds based on local gradient information. These bounds strongly motivate input gradient regularization. Second, we implement a scaleable version of input gradient regularization which avoids double backpropagation: adversarially robust ImageNet models are trained in 33 hours on four consumer grade GPUs. Finally, we show experimentally and through theoretical certification that input gradient regularization is competitive with adversarial training. Moreover we demonstrate that gradient regularization does not lead to gradient obfuscation or gradient masking.
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A principled approach for generating adversarial images under non-smooth dissimilarity metrics
ProxLogBarrier extends the LogBarrier adversarial attack to non-smooth metrics via proximal gradient, achieving state-of-the-art ℓ0 perturbation results.
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