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arXiv · 1911.10244

DeepSynth: Automata Synthesis for Automatic Task Segmentation in Deep Reinforcement Learning

Mohammadhosein Hasanbeig·Natasha Yogananda Jeppu·Alessandro Abate·Tom Melham·Daniel Kroening
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Abstract

This paper proposes DeepSynth, a method for effective training of deep Reinforcement Learning (RL) agents when the reward is sparse and non-Markovian, but at the same time progress towards the reward requires achieving an unknown sequence of high-level objectives. Our method employs a novel algorithm for synthesis of compact automata to uncover this sequential structure automatically. We synthesise a human-interpretable automaton from trace data collected by exploring the environment. The state space of the environment is then enriched with the synthesised automaton so that the generation of a control policy by deep RL is guided by the discovered structure encoded in the automaton. The proposed approach is able to cope with both high-dimensional, low-level features and unknown sparse non-Markovian rewards. We have evaluated DeepSynth's performance in a set of experiments that includes the Atari game Montezuma's Revenge. Compared to existing approaches, we obtain a reduction of two orders of magnitude in the number of iterations required for policy synthesis, and also a significant improvement in scalability.

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Mohammadhosein Hasanbeig, Natasha Yogananda Jeppu, Alessandro Abate, Tom Melham, Daniel Kroening. 2019-11-22. DeepSynth: Automata Synthesis for Automatic Task Segmentation in Deep Reinforcement Learning. https://arxiv.org/abs/1911.10244

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