通过动态优化模型与数据对,显著提升通用对抗扰动的泛化能力。
Improving Generalization of Universal Adversarial Perturbation via Dynamic Maximin Optimization
- 采用动态最大最小优化策略,迭代更新模型与数据配对。
- 仅用500样本即实现12.1%的误分类率提升,超越当前最优方法。
- 适合研究对抗攻击、模型鲁棒性或安全评估的开发者参考。
深度神经网络易受通用对抗扰动(UAP)影响。这类扰动精心设计,可对目标模型在所有样本类别上产生普遍误导。与针对特定样本的对抗样本不同,生成UAP更具挑战性,因其需在大量数据样本和模型间保持泛化性。现有方法使用固定参数的DNN模型生成UAP,未能充分发挥DNN潜力。本文提出动态最大最小优化策略(DM-UAP),通过迭代优化最优模型-数据对,构建更有效的通用扰动。该方法结合课程学习机制,系统探索模型参数与数据的联合空间。在ImageNet上的实验表明,仅使用500个样本,DM-UAP在跨样本通用性和跨模型迁移性上均有显著提升,平均误分类率相比现有最佳方法提高12.108%。
原文摘要 · Abstract (English)
Deep neural networks (DNNs) are susceptible to universal adversarial perturbations (UAPs). These perturbations are meticulously designed to fool the target model universally across all sample classes. Unlike instance-specific adversarial examples (AEs), generating UAPs is more complex because they must be generalized across a wide range of data samples and models. Our research reveals that existing universal attack methods, which optimize UAPs using DNNs with static model parameter snapshots, do not fully leverage the potential of DNNs to generate more effective UAPs. Rather than optimizing UAPs against static DNN models with a fixed training set, we suggest using dynamic model-data pairs to generate UAPs. In particular, we introduce a dynamic maximin optimization strategy, aiming to optimize the UAP across a variety of optimal model-data pairs. We term this approach DM-UAP. DM-UAP utilizes an iterative max-min-min optimization framework that refines the model-data pairs, coupled with a curriculum UAP learning algorithm to examine the combined space of model parameters and data thoroughly. Comprehensive experiments on the ImageNet dataset demonstrate that the proposed DM-UAP markedly enhances both cross-sample universality and cross-model transferability of UAPs. Using only 500 samples for UAP generation, DM-UAP outperforms the state-of-the-art approach with an average increase in fooling ratio of 12.108%.
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