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Xuan-Yi Zhou

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#machine learning Preprint Sep 2026

EasyPPO: Stabilizing the Critic Is Key

A key strength of Proximal Policy Optimization (PPO) is its learned critic, which uses historical trajectories collected during reinforcement learning to estimate expected returns and reduce policy-gradient variance. However, we find that the critic is also a major source of instability in reinforcement learning for la...

Xuan-Yi Zhou, Qiu-Yang Mang, Huan-Zhi Mao et al. · 0 citations