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arXiv 2402.07019cs.LG
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强化学习中奖励函数的信息量

Informativeness of Reward Functions in Reinforcement Learning

MPI-SWS(马克斯·普朗克软件系统研究所);The Alan Turing Institute(艾伦·图灵研究所)

Rati Devidze, Parameswaran Kamalaruban, Adish Singla

AI总结:

本文研究强化学习中奖励函数的信息量设计问题,提出一种能够自适应智能体当前策略的奖励信息量准则,以加速智能体收敛并提供可解释的奖励,理论和导航实验均验证了其有效性。

摘要:

奖励函数在指定我们希望强化学习智能体执行的任务中处于核心地位。给定一个任务和期望的最优行为,我们研究设计具有信息量的奖励函数的问题,使得设计的奖励能够加速智能体的收敛。具体而言,我们考虑专家驱动的奖励设计设置,其中专家或教师寻求向学习智能体提供具有信息量且可解释的奖励。现有工作已经考虑了多种不同的奖励设计公式;然而,关键挑战在于制定一个奖励信息量准则,该准则能够相对于智能体当前策略进行自适应调整,并且能够在特定结构约束下进行优化以获得可解释的奖励。在本文中,我们提出了一种新颖的奖励信息量准则,这是一种定量度量,用于捕捉智能体在接收到来自特定奖励函数的奖励时,其当前策略将如何改进。我们从理论上展示了所提出的信息量准则在为智能体自适应设计奖励时的效用。在两个导航任务上的实验结果证明了我们自适应奖励信息量准则的有效性。

英文摘要:

Reward functions are central in specifying the task we want a reinforcement learning agent to perform. Given a task and desired optimal behavior, we study the problem of designing informative reward functions so that the designed rewards speed up the agent's convergence. In particular, we consider expert-driven reward design settings where an expert or teacher seeks to provide informative and interpretable rewards to a learning agent. Existing works have considered several different reward design formulations; however, the key challenge is formulating a reward informativeness criterion that adapts w.r.t. the agent's current policy and can be optimized under specified structural constraints to obtain interpretable rewards. In this paper, we propose a novel reward informativeness criterion, a quantitative measure that captures how the agent's current policy will improve if it receives rewards from a specific reward function. We theoretically showcase the utility of the proposed informativeness criterion for adaptively designing rewards for an agent. Experimental results on two navigation tasks demonstrate the effectiveness of our adaptive reward informativeness criterion.

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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