Detecting Backdoors with Meta-Models

Published: 28 Oct 2023, Last Modified: 13 Mar 2024NeurIPS 2023 BUGS PosterEveryoneRevisionsBibTeX
Keywords: backdoors, interpretability, meta-models
TL;DR: We propose to use \emph{meta-models}, neural networks that take another network's parameters as input, to detect backdoors directly from model weights.
Abstract: It is widely known that it is possible to implant backdoors into neural networks, by which an attacker can choose an input to produce a particular undesirable output (e.g.\ misclassify an image). We propose to use \emph{meta-models}, neural networks that take another network's parameters as input, to detect backdoors directly from model weights. To this end we present a meta-model architecture and train it on a dataset of approx.\ 4000 clean and backdoored CNNs trained on CIFAR-10. Our approach is simple and scalable, and is able to detect the presence of a backdoor with $>99\%$ accuracy when the test trigger pattern is i.i.d., with some success even on out-of-distribution backdoors.
Submission Number: 8
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