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Poster
Language as an Abstraction for Hierarchical Deep Reinforcement Learning
YiDing Jiang · Shixiang (Shane) Gu · Kevin Murphy · Chelsea Finn
Wed Dec 11 10:45 AM -- 12:45 PM (PST) @ East Exhibition Hall B + C #197
Solving complex, temporally-extended tasks is a long-standing problem in reinforcement learning (RL). We hypothesize that one critical element of solving such problems is the notion of compositionality. With the ability to learn sub-skills that can be composed to solve longer tasks, i.e. hierarchical RL, we can acquire temporally-extended behaviors. However, acquiring effective yet general abstractions for hierarchical RL is remarkably challenging. In this paper, we propose to use language as the abstraction, as it provides unique compositional structure, enabling fast learning and combinatorial generalization, while retaining tremendous flexibility, making it suitable for a variety of problems. Our approach learns an instruction-following low-level policy and a high-level policy that can reuse abstractions across tasks, in essence, permitting agents to reason using structured language. To study compositional task learning, we introduce an open-source object interaction environment built using the MuJoCo physics engine and the CLEVR engine. We find that, using our approach, agents can learn to solve to diverse, temporally-extended tasks such as object sorting and multi-object rearrangement, including from raw pixel observations. Our analysis find that the compositional nature of language is critical for learning and systematically generalizing sub-skills in comparison to non-compositional abstractions that use the same supervision.
Author Information
YiDing Jiang (Google Research)
Shixiang (Shane) Gu (Google Brain)
Kevin Murphy (Google)
Chelsea Finn (Google Brain)
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