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Topological Detection of Trojaned Neural Networks
Songzhu Zheng · Yikai Zhang · Hubert Wagner · Mayank Goswami · Chao Chen

Wed Dec 08 04:30 PM -- 06:00 PM (PST) @ Virtual

Deep neural networks are known to have security issues. One particular threat is the Trojan attack. It occurs when the attackers stealthily manipulate the model's behavior through Trojaned training samples, which can later be exploited. Guided by basic neuroscientific principles, we discover subtle -- yet critical -- structural deviation characterizing Trojaned models. In our analysis we use topological tools. They allow us to model high-order dependencies in the networks, robustly compare different networks, and localize structural abnormalities. One interesting observation is that Trojaned models develop short-cuts from shallow to deep layers. Inspired by these observations, we devise a strategy for robust detection of Trojaned models. Compared to standard baselines it displays better performance on multiple benchmarks.

Author Information

Songzhu Zheng (Stony Brook University)
Yikai Zhang (Rutgers University)
Hubert Wagner (Institute of Science and Technology Austria)
Mayank Goswami (CUNY Queens College)
Chao Chen (Stony Brook University)

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