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Defense against Backdoor Attacks via Identifying and Purifying Bad Neurons. (arXiv:2208.06537v1 [cs.LG])
Aug. 16, 2022, 1:20 a.m. | Mingyuan Fan, Yang Liu, Cen Chen, Ximeng Liu, Wenzhong Guo
cs.CR updates on arXiv.org arxiv.org
The opacity of neural networks leads their vulnerability to backdoor attacks,
where hidden attention of infected neurons is triggered to override normal
predictions to the attacker-chosen ones. In this paper, we propose a novel
backdoor defense method to mark and purify the infected neurons in the
backdoored neural networks. Specifically, we first define a new metric, called
benign salience. By combining the first-order gradient to retain the
connections between neurons, benign salience can identify the infected neurons
with higher accuracy …
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