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DVERGE: Diversifying Vulnerabilities for Enhanced Robust Generation of Ensembles
Huanrui Yang · Jingyang Zhang · Hongliang Dong · Nathan Inkawhich · Andrew Gardner · Andrew Touchet · Wesley Wilkes · Heath Berry · Hai Li

Wed Dec 09 06:00 AM -- 06:15 AM (PST) @ Orals & Spotlights: Social/Adversarial Learning

Recent research finds CNN models for image classification demonstrate overlapped adversarial vulnerabilities: adversarial attacks can mislead CNN models with small perturbations, which can effectively transfer between different models trained on the same dataset. Adversarial training, as a general robustness improvement technique, eliminates the vulnerability in a single model by forcing it to learn robust features. The process is hard, often requires models with large capacity, and suffers from significant loss on clean data accuracy. Alternatively, ensemble methods are proposed to induce sub-models with diverse outputs against a transfer adversarial example, making the ensemble robust against transfer attacks even if each sub-model is individually non-robust. Only small clean accuracy drop is observed in the process. However, previous ensemble training methods are not efficacious in inducing such diversity and thus ineffective on reaching robust ensemble. We propose DVERGE, which isolates the adversarial vulnerability in each sub-model by distilling non-robust features, and diversifies the adversarial vulnerability to induce diverse outputs against a transfer attack. The novel diversity metric and training procedure enables DVERGE to achieve higher robustness against transfer attacks comparing to previous ensemble methods, and enables the improved robustness when more sub-models are added to the ensemble. The code of this work is available at https://github.com/zjysteven/DVERGE.

Author Information

Huanrui Yang (Duke University)
Jingyang Zhang (Duke University)
Hongliang Dong (Duke University)
Nathan Inkawhich (Duke University)
Andrew Gardner (Radiance Technologies)
Andrew Touchet (Radiance Technologies)
Wesley Wilkes (Radiance Technologies)
Heath Berry (Radiance Technologies)
Hai Li (Duke University)

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