SignCert-PO mitigates reward hacking in RLHF by down-weighting completions whose advantage signs are not robust to small reward-model perturbations, using a certified preservation radius derived at the policy optimization stage.
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Mitigating Reward Hacking in RLHF via Advantage Sign Robustness
SignCert-PO mitigates reward hacking in RLHF by down-weighting completions whose advantage signs are not robust to small reward-model perturbations, using a certified preservation radius derived at the policy optimization stage.