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Collective eXplainable AI: Explaining Cooperative Strategies and Agent Contribution in Multiagent Reinforcement Learning with Shapley Values

Abstract : While Explainable Artificial Intelligence (XAI) is increasingly expanding more areas of application, little has been applied to make deep Reinforcement Learning (RL) more comprehensible. As RL becomes ubiquitous and used in critical and general public applications, it is essential to develop methods that make it better understood and more interpretable. This study proposes a novel approach to explain cooperative strategies in multiagent RL using Shapley values, a game theory concept used in XAI that successfully explains the rationale behind decisions taken by Machine Learning algorithms. Through testing common assumptions of this technique in two cooperation-centered socially challenging multi-agent environments environments, this article argues that Shapley values are a pertinent way to evaluate the contribution of players in a cooperative multi-agent RL context. To palliate the high overhead of this method, Shapley values are approximated using Monte Carlo sampling. Experimental results on Multiagent Particle and Sequential Social Dilemmas show that Shapley values succeed at estimating the contribution of each agent. These results could have implications that go beyond games in economics, (e.g., for non-discriminatory decision making, ethical and responsible AI-derived decisions or policy making under fairness constraints). They also expose how Shapley values only give general explanations about a model and cannot explain a single run, episode nor justify precise actions taken by agents. Future work should focus on addressing these critical aspects.
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https://hal.archives-ouvertes.fr/hal-03549473
Contributor : Alexandre Heuillet Connect in order to contact the contributor
Submitted on : Monday, January 31, 2022 - 2:09:44 PM
Last modification on : Wednesday, July 20, 2022 - 3:49:20 AM
Long-term archiving on: : Sunday, May 1, 2022 - 7:28:39 PM

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Alexandre Heuillet, Fabien Couthouis, Natalia Diaz-Rodriguez. Collective eXplainable AI: Explaining Cooperative Strategies and Agent Contribution in Multiagent Reinforcement Learning with Shapley Values. IEEE Computational Intelligence Magazine, Institute of Electrical and Electronics Engineers, 2022, 17 (1), pp.59-71. ⟨10.1109/MCI.2021.3129959⟩. ⟨hal-03549473⟩

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