Transferring Hierarchical Structures with Dual Meta Imitation LearningDownload PDF

16 Jun 2022, 10:45 (modified: 09 Oct 2022, 05:27)CoRL 2022 PosterReaders: Everyone
Student First Author: yes
Keywords: Hierarchical Imitation Learning, Meta Learning
TL;DR: A dual meta imitation learning framework for fast adaptation of hierarchical imitation learning methods in new tasks.
Abstract: Hierarchical Imitation Learning (HIL) is an effective way for robots to learn sub-skills from long-horizon unsegmented demonstrations. However, the learned hierarchical structure lacks the mechanism to transfer across multi-tasks or to new tasks, which makes them have to learn from scratch when facing a new situation. Transferring and reorganizing modular sub-skills require fast adaptation ability of the whole hierarchical structure. In this work, we propose Dual Meta Imitation Learning (DMIL), a hierarchical meta imitation learning method where the high-level network and sub-skills are iteratively meta-learned with model-agnostic meta-learning. DMIL uses the likelihood of state-action pairs from each sub-skill as the supervision for the high-level network adaptation and uses the adapted high-level network to determine different data set for each sub-skill adaptation. We theoretically prove the convergence of the iterative training process of DMIL and establish the connection between DMIL and Expectation-Maximization algorithm. Empirically, we achieve state-of-the-art few-shot imitation learning performance on the Meta-world benchmark and competitive results on long-horizon tasks in Kitchen environments.
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