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Poisoning Generative Replay in Continual Learning to Promote Forgetting

ICML 2023 · Continual learning › Online and replay-based · approach: Replay buffer construction and update

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Add input-aware dirty-label backdoor poisoning (CIAP) to replayer training datagenerative replay continual learning · split-MNISTtest accuracy on past tasks: past-task accuracy drops to around 25% from replay baselineHelped
Add input-aware backdoor poisoning while keeping current-task accuracygenerative replay continual learning · split-MNISTtest accuracy on current task: current-task accuracy stays near 100%, same as cleanNo clear effect
Reduce poison ratio to 5% backdoor and 5% cross (ablation)CIAP · split-MNISTtest accuracy on past tasks: attack weaker: past accuracy above 70% vs about 25% at 25%/15%Hurt
Use a surrogate classifier with different architecture than victim (5%/5% poisons) (ablation)CIAP · split-MNISTtest accuracy on past tasks: past-task accuracy reduced from 90% (clean) to 35%Helped
Apply nu-SVM outlier filter to replayed samples (ablation)CIAP · split-MNISTtest accuracy on past tasks: filtering helps only a little; past accuracy still below 50%No clear effect
Apply nu-SVM outlier filter to replayed samples (ablation)CIAP · split-CIFAR-10test accuracy on past tasks: drops to almost 0 across nu valuesNo clear effect
Replace input-aware trigger with static white-square backdoor (ablation)replayer trigger preservation · split-MNISTattack success rate after replay: static ASR 100% vs IAB ASR 0 (i.e., IAB is discarded)Hurt
Use input-aware (per-example) trigger rather than static trigger (ablation)cWGAN replayer · split-MNISTfraction of backdoored images produced by replayer: IAB yields 40% backdoored images at 90% poisoned training vs static retaining nearly allHelped
Replace clean replay with poisoned replay via CIAP on FashionMNIST-MNIST (cWGAN)generative replay · FashionMNIST-MNISTtest accuracy on earlier task: earlier-task accuracy 17% under attack vs 66% clean replayHelped
Replace cWGAN with cVAE replayer under CIAP attack on FashionMNIST-MNISTgenerative replay · FashionMNIST-MNISTtest accuracy on earlier task: earlier-task accuracy drops from 91% to 27%Helped
Apply CIAP poisoning to split-CIFAR-10 replaygenerative replay · split-CIFAR-10test accuracy on past tasks: past-task accuracy drops to 0% after poisoning, erasing DGR gainsHelped
Naive label flipping (25%) instead of input-aware poisoning (ablation)naive poisoning baseline · split-MNISTtest accuracy on current task: current-task accuracy drops below 20% from task 2, failing stealthHurt

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