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arXiv 2202.07301cs.LG
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面向用户的鲁棒强化学习

User-Oriented Robust Reinforcement Learning

Shanghai Jiao Tong University(上海交通大学)

Haoyi You, Beichen Yu, Haiming Jin, Zhaoxing Yang, Jiahui Sun

摘要:

近年来,提高策略在不同环境下的鲁棒性引起了强化学习(RL)界越来越多的关注。现有的鲁棒强化学习方法主要是通过优化策略在最坏情况下的性能来实现最大最小鲁棒性。然而,在实践中,使用RL策略的用户可能会在不同的环境中对其性能有不同的偏好。显然,上述最大-最小鲁棒性通常过于保守,无法满足用户偏好。因此,本文将用户偏好融入鲁棒强化学习的策略学习中,提出了一种面向用户的鲁棒强化学习(User-Oriented Robust RL,UOR-RL)框架。具体来说,我们定义了一个新的面向用户的鲁棒性(UOR)RL度量,根据用户的喜好分配不同的权重的环境和推广的最大-最小鲁棒性度量。为了优化UOR度量,我们分别针对具有或不具有先验已知环境分布的场景开发了两种不同的UOR-RL训练算法。从理论上讲,我们证明了我们的UOR-RL训练算法收敛到接近最优的策略,即使不准确或完全没有关于环境分布的知识。此外,我们在4个MuJoCo任务中进行了广泛的实验评估。实验结果表明,UOR-RL在平均和最坏情况下的性能指标下与最先进的基线相当,更重要的是在UOR指标下建立了新的最先进的性能。

英文摘要:

Recently, improving the robustness of policies across different environments attracts increasing attention in the reinforcement learning (RL) community. Existing robust RL methods mostly aim to achieve the max-min robustness by optimizing the policy's performance in the worst-case environment. However, in practice, a user that uses an RL policy may have different preferences over its performance across environments. Clearly, the aforementioned max-min robustness is oftentimes too conservative to satisfy user preference. Therefore, in this paper, we integrate user preference into policy learning in robust RL, and propose a novel User-Oriented Robust RL (UOR-RL) framework. Specifically, we define a new User-Oriented Robustness (UOR) metric for RL, which allocates different weights to the environments according to user preference and generalizes the max-min robustness metric. To optimize the UOR metric, we develop two different UOR-RL training algorithms for the scenarios with or without a priori known environment distribution, respectively. Theoretically, we prove that our UOR-RL training algorithms converge to near-optimal policies even with inaccurate or completely no knowledge about the environment distribution. Furthermore, we carry out extensive experimental evaluations in 4 MuJoCo tasks. The experimental results demonstrate that UOR-RL is comparable to the state-of-the-art baselines under the average and worst-case performance metrics, and more importantly establishes new state-of-the-art performance under the UOR metric.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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