arXiv:2512.06252cs.LG2025-12被引 1

不靠定时重置,也能让强化学习稳定训练。

Learning Without Time-Based Embodiment Resets in Soft-Actor Critic

  • 改进SAC算法,实现无周期终止的持续学习
  • 无重置时性能下降,但调高策略熵可恢复
  • 适合研究真实场景下持续学习的科研人员

在构建强化学习任务时,常通过分段训练和频繁重置环境来加速学习,但这会带来非自然设定并影响实际部署表现。本文研究在不使用任务终止与机器人状态重置的情况下,基于Soft Actor-Critic(SAC)算法进行学习的挑战。提出一种持续版SAC算法,仅通过调整奖励函数即可实现与传统分段SAC相当甚至更优的性能,且对折扣率γ的敏感度降低。在修改后的Gym Reacher任务中发现,移除状态重置会导致探索能力下降,进而引发学习失败或显著变慢。此外,在更多模拟任务及一个真实机器人视觉任务上验证,当性能停滞或下降时增加策略熵,可有效弥补因未使用重置导致的性能损失。

原文摘要 · Abstract (English)

When creating new reinforcement learning tasks, practitioners often accelerate the learning process by incorporating into the task several accessory components, such as breaking the environment interaction into independent episodes and frequently resetting the environment. Although they can enable the learning of complex intelligent behaviors, such task accessories can result in unnatural task setups and hinder long-term performance in the real world. In this work, we explore the challenges of learning without episode terminations and robot embodiment resets using the Soft Actor-Critic (SAC) algorithm. To learn without terminations, we present a continuing version of the SAC algorithm and show that, with simple modifications to the reward functions of existing tasks, continuing SAC can perform as well as or better than episodic SAC while reducing the sensitivity of performance to the value of the discount rate $γ$. On a modified Gym Reacher task, we investigate possible explanations for the failure of continuing SAC when learning without embodiment resets. Our results suggest that embodiment resets help with exploration of the state space in the SAC algorithm, and removing embodiment resets can lead to poor exploration of the state space and failure of or significantly slower learning. Finally, on additional simulated tasks and a real-robot vision task, we show that increasing the entropy of the policy when performance trends worse or remains static is an effective intervention for recovering the performance lost due to not using embodiment resets.

强化学习持续学习SAC

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