We study how to effectively leverage expert feedback to learn sequential decision-making policies. We focus on problems with sparse rewards and long time horizons, which typically pose significant challenges in reinforcement learning. We propose an algorithmic framework, called hierarchical guidance, that leverages the hierarchical structure of the underlying problem to integrate different modes of expert interaction. Our framework can incorporate different combinations of imitation learning (IL) and reinforcement learning (RL) at different levels, leading to dramatic reductions in both expert effort and cost of exploration. Using long-horizon benchmarks, including Montezuma's Revenge, we demonstrate that our approach can learn significantly faster than hierarchical RL, and be significantly more label-efficient than standard IL. We also theoretically analyze labeling cost for certain instantiations of our framework.
Hierarchical Imitation and Reinforcement Learning
Hoang Minh Le,Nan Jiang,Alekh Agarwal,Miroslav Dudík,Yisong Yue,Hal Daumé
Published 2018 in International Conference on Machine Learning
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- Publication year
2018
- Venue
International Conference on Machine Learning
- Publication date
2018-03-01
- Fields of study
Mathematics, Computer Science
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