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English(EN) Rethinking Critic Learning in PPO: Understanding and Mitigating Value Flattening

新的SP3O方法缓解了LLM中PPO的价值平坦化问题

研究人员在Proximal Policy Optimization (PPO) 中发现了一种称为价值平坦化(Value Flattening)的故障模式,在这种模式下,尽管中间状态的值发生了剧烈变化,但Critic估计的状态值却变得平坦。这个问题在更大的状态空间中会加剧,并可能导致冗余更新。为了解决这个问题,提出了一种名为SParse Proximal Policy Optimization (SP$^3$O) 的新方法,该方法仅对每个响应中的少数选定状态应用价值损失。在Qwen3-Base上的实验表明,SP$^3$O能有效缓解价值平坦化并改进策略学习。 AI

影响 通过解决Critic学习中的特定故障模式,引入了一种改进大型语言模型策略学习的方法。

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新的SP3O方法缓解了LLM中PPO的价值平坦化问题

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报道来源 [2]

  1. arXiv cs.AI TIER_1 English(EN) · Yizhuo Li, Jianhao Yan, Yun Luo, Zhi Wang, Futing Wang, Rong-Xi Tan, Kanghui Tian, Ganqu Cui, Ning Ding, Peilin Zhao, Yafu Li, Yu Cheng ·

    重新思考PPO中的Critic学习:理解和缓解价值平坦化

    arXiv:2609.18708v1 Announce Type: cross Abstract: In reinforcement learning for large language models, Proximal Policy Optimization (PPO) commonly uses a critic to estimate state values and reduce the variance of policy updates. However, we uncover a systematic failure mode in PP…

  2. Hugging Face Daily Papers TIER_1 English(EN) ·

    重新思考PPO中的Critic学习:理解与缓解价值平坦化

    In reinforcement learning for large language models, Proximal Policy Optimization (PPO) commonly uses a critic to estimate state values and reduce the variance of policy updates. However, we uncover a systematic failure mode in PPO critics, which we call Value Flattening: state v…