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Exploration-Guided Reward Shaping for Reinforcement Learning under Sparse Rewards
Rati Devidze · Parameswaran Kamalaruban · Adish Singla

Thu Dec 01 09:00 AM -- 11:00 AM (PST) @ Hall J #339

We study the problem of reward shaping to accelerate the training process of a reinforcement learning agent. Existing works have considered a number of different reward shaping formulations; however, they either require external domain knowledge or fail in environments with extremely sparse rewards. In this paper, we propose a novel framework, Exploration-Guided Reward Shaping (ExploRS), that operates in a fully self-supervised manner and can accelerate an agent's learning even in sparse-reward environments. The key idea of ExploRS is to learn an intrinsic reward function in combination with exploration-based bonuses to maximize the agent's utility w.r.t. extrinsic rewards. We theoretically showcase the usefulness of our reward shaping framework in a special family of MDPs. Experimental results on several environments with sparse/noisy reward signals demonstrate the effectiveness of ExploRS.

Author Information

Rati Devidze (MPI-SWS)
Parameswaran Kamalaruban (EPFL)
Adish Singla (MPI-SWS)

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