SURA detects federated-learning backdoors with 10 clean images
It reuses one small clean proxy across repeated loss-ascent probes and restores batch-norm state only at readout.
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It reuses one small clean proxy across repeated loss-ascent probes and restores batch-norm state only at readout.
CIFAR-10 forget accuracy fell 61.50 points from BN recalibration with every learnable weight fixed.
Tests on two federated-learning schemes strip ownership marks without training data and with little accuracy loss.
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