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Qing-Lin Su

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#machine learning Preprint Oct 2026

RM-OPD: On-Policy Distillation for Generative Reward Models

Reinforcement Learning on Mixed-domain preference data (Mix-RL) has become the mainstream approach for training general-purpose Generative Reward Models (GRMs). However, Mix-RL suffers from two critical bottlenecks: the reward sparsity induced by outcome rewards, and the cross-domain interference arising from jointly o...

Qing-Lin Su, Li-Cheng Pan, Zhen Fang et al. · 0 citations