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Accelerated Reinforcement Learning for Temporal Logic Control Objectives

2022-05-09 17:09:51
Yiannis Kantaros

Abstract

This paper addresses the problem of learning control policies for mobile robots modeled as unknown Markov Decision Processes (MDPs) that are tasked with temporal logic missions, such as sequencing, coverage, or surveillance. The MDP captures uncertainty in the workspace structure and the outcomes of control decisions. The control objective is to synthesize a control policy that maximizes the probability of accomplishing a high-level task, specified as a Linear Temporal Logic (LTL) formula. To address this problem, we propose a novel accelerated model-based reinforcement learning (RL) algorithm for LTL control objectives that is capable of learning control policies significantly faster than related approaches. Its sample-efficiency relies on biasing exploration towards directions that may contribute to task satisfaction. This is accomplished by leveraging an automaton representation of the LTL task as well as a continuously learned MDP model. Finally, we provide extensive comparative experiments that demonstrate the sample efficiency of the proposed method against recent temporal logic RL methods.

Abstract (translated)

URL

https://arxiv.org/abs/2205.04424

PDF

https://arxiv.org/pdf/2205.04424.pdf


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