QVec removes quantization-conditioned backdoors by subtracting a structured malicious direction from model weights estimated via one quantization pass and task arithmetic, without retraining or trigger samples.
arXiv preprint arXiv:2512.06243 (2025) 4 18 F
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Quantization as a Malicious Task: Removing Quantization-Conditioned Backdoors via Task Arithmetic
QVec removes quantization-conditioned backdoors by subtracting a structured malicious direction from model weights estimated via one quantization pass and task arithmetic, without retraining or trigger samples.