Know Your Action Set: Learning Action Relations for Reinforcement Learning

Intelligent agents can solve tasks in a variety of ways depending on the action set at their disposal. For instance, while using a toolkit for repair, the choice of tool (the action) closely depends on what other tools are available. Yet, such dependence on other available actions is ignored in conventional reinforcement learning (RL) since it assumes a fixed action set. In this work, we posit that learning the interdependence between actions is crucial for RL agents acting under a varying action set. To this end, we propose a novel policy architecture that consists of an input graph composed of available actions and a graph attention network to learn the action interdependence. We demonstrate that our architecture makes action decisions by correctly attending to the relevant actions in both value-based and policy-based RL. Consequently, it consistently outperforms non-relational architectures on applications where the action space can vary, such as recommender systems and physical reasoning with tools and skills.

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