Publication
ICML 2021
Paper

Adversarial Option-Aware Hierarchical Imitation Learning

ICML 2021
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Abstract

It has been a challenge to learning skills for an agent from long-horizon unannotated demonstrations. Existing approaches like Hierarchical Imitation Learning(HIL) are prone to compounding errors or immature solutions. In this paper, we propose Option-GAIL, a novel method to learn skills at a long horizon.The key idea of Option-GAIL is modeling the task hierarchy by options and train the policy via generative adversarial optimization. In particular, we propose an Expectation-Maximization(EM)-style algorithm: an E-step that samples the options of expert conditioned on the current learned policy, and an M-step that updates the low- and high-level policies of agent simultaneously to minimize the newly proposed option-occupancy measurement between expert and agent. We theoretically prove the convergence of the proposed algorithm. Experiments show that our Option-GAIL outperforms other counterparts consistently across a variety of tasks.

Date

18 Jul 2021

Publication

ICML 2021

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