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- W4387293452 abstract "Real-life applications of deep neural networks are hindered by their unsteady predictions when faced with noisy inputs and adversarial attacks. The certified radius is in this context a crucial indicator of the robustness of models. However how to design an efficient classifier with a sufficient certified radius? Randomized smoothing provides a promising framework by relying on noise injection in inputs to obtain a smoothed and more robust classifier. In this paper, we first show that the variance introduced by randomized smoothing closely interacts with two other important properties of the classifier, i.e. its Lipschitz constant and margin. More precisely, our work emphasizes the dual impact of the Lipschitz constant of the base classifier, on both the smoothed classifier and the empirical variance. Moreover, to increase the certified robust radius, we introduce a different simplex projection technique for the base classifier to leverage the variance-margin trade-off thanks to Bernstein's concentration inequality, along with an enhanced Lipschitz bound. Experimental results show a significant improvement in certified accuracy compared to current state-of-the-art methods. Our novel certification procedure allows us to use pre-trained models that are used with randomized smoothing, effectively improving the current certification radius in a zero-shot manner." @default.
- W4387293452 created "2023-10-03" @default.
- W4387293452 creator A5051652099 @default.
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- W4387293452 date "2023-09-28" @default.
- W4387293452 modified "2023-10-04" @default.
- W4387293452 title "The Lipschitz-Variance-Margin Tradeoff for Enhanced Randomized Smoothing" @default.
- W4387293452 doi "https://doi.org/10.48550/arxiv.2309.16883" @default.
- W4387293452 hasPublicationYear "2023" @default.
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