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arXiv · 2112.01585

Differentially Private Exploration in Reinforcement Learning with Linear Representation

Paul Luyo·Evrard Garcelon·Alessandro Lazaric·Matteo Pirotta
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Abstract

This paper studies privacy-preserving exploration in Markov Decision Processes (MDPs) with linear representation. We first consider the setting of linear-mixture MDPs (Ayoub et al., 2020) (a.k.a.\ model-based setting) and provide an unified framework for analyzing joint and local differential private (DP) exploration. Through this framework, we prove a $\widetilde{O}(K^{3/4}/\sqrt{\epsilon})$ regret bound for $(\epsilon,\delta)$-local DP exploration and a $\widetilde{O}(\sqrt{K/\epsilon})$ regret bound for $(\epsilon,\delta)$-joint DP. We further study privacy-preserving exploration in linear MDPs (Jin et al., 2020) (a.k.a.\ model-free setting) where we provide a $\widetilde{O}\left(K^{\frac{3}{5}}/\epsilon^{\frac{2}{5}}\right)$ regret bound for $(\epsilon,\delta)$-joint DP, with a novel algorithm based on low-switching. Finally, we provide insights into the issues of designing local DP algorithms in this model-free setting.

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Paul Luyo, Evrard Garcelon, Alessandro Lazaric, Matteo Pirotta. 2021-12-02. Differentially Private Exploration in Reinforcement Learning with Linear Representation. https://arxiv.org/abs/2112.01585

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