## Know Your Action Set: Learning Action Relations for Reinforcement Learning

29 Sept 2021, 00:30 (modified: 16 Mar 2022, 08:08)ICLR 2022 PosterReaders: Everyone
Keywords: reinforcement learning, varying action space, relational reasoning
Abstract: Intelligent agents can solve tasks in various ways depending on their available set of actions. However, conventional reinforcement learning (RL) assumes a fixed action set. This work asserts that tasks with varying action sets require reasoning of the relations between the available actions. For instance, taking a nail-action in a repair task is meaningful only if a hammer-action is also available. To learn and utilize such action relations, we propose a novel policy architecture consisting of a graph attention network over the available actions. We show that our model makes informed action decisions by correctly attending to other related actions in both value-based and policy-based RL. Consequently, it outperforms non-relational architectures on applications where the action space often varies, such as recommender systems and physical reasoning with tools and skills. Results and code at https://sites.google.com/view/varyingaction .
One-sentence Summary: Learning action interdependence for reinforcement learning under a varying action space.
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