Reliable Off-policy Evaluation for Reinforcement Learning

• URL: http://arxiv.org/abs/2011.04102v2
• Date: Fri, 15 Jan 2021 16:34:42 GMT
• Title: Reliable Off-policy Evaluation for Reinforcement Learning
• Authors: Jie Wang, Rui Gao, Hongyuan Zha
• Abstract summary: In a sequential decision-making problem, off-policy evaluation estimates the expected cumulative reward of a target policy. We propose a novel framework that provides robust and optimistic cumulative reward estimates using one or multiple logged data.
• Score: 53.486680020852724
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In a sequential decision-making problem, off-policy evaluation estimates the expected cumulative reward of a target policy using logged trajectory data generated from a different behavior policy, without execution of the target policy. Reinforcement learning in high-stake environments, such as healthcare and education, is often limited to off-policy settings due to safety or ethical concerns, or inability of exploration. Hence it is imperative to quantify the uncertainty of the off-policy estimate before deployment of the target policy. In this paper, we propose a novel framework that provides robust and optimistic cumulative reward estimates using one or multiple logged trajectories data. Leveraging methodologies from distributionally robust optimization, we show that with proper selection of the size of the distributional uncertainty set, these estimates serve as confidence bounds with non-asymptotic and asymptotic guarantees under stochastic or adversarial environments. Our results are also generalized to batch reinforcement learning and are supported by empirical analysis.

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