Cited by 67Explainable Artificial Intelligence (XAI)Bayesian Modeling and Causal InferenceReinforcement Learning in Robotics

Explainable Reinforcement Learning through a Causal Lens

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Madumal, Prashan, Miller, Tim, Sonenberg, Liz, Vetere, Frank·2020·Proceedings of the AAAI Conference on Artificial Intelligence

Abstract

Prominent theories in cognitive science propose that humans understand and represent the knowledge of the world through causal relationships. In making sense of the world, we build causal models in our mind to encode cause-effect relations of events and use these to explain why new events happen by referring to counterfactuals — things that did not happen. In this paper, we use causal models to derive causal explanations of the behaviour of model-free reinforcement learning agents. We present an approach that learns a structural causal model during reinforcement learning and encodes causal relationships between variables of interest. This model is then used to generate explanations of behaviour based on counterfactual analysis of the causal model. We computationally evaluate the model in 6 domains and measure performance and task prediction accuracy. We report on a study with 120 participants who observe agents playing a real-time strategy game (Starcraft II) and then receive explanations of the agents' behaviour. We investigate: 1) participants' understanding gained by explanations through task prediction; 2) explanation satisfaction and 3) trust. Our results show that causal model explanations perform better on these measures compared to two other baseline explanation models.

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  1. De Graaf, M. M. A., and Malle, B. F. 2017. How People Explain Action (and Autonomous Intelligent Systems Should Too). AAAI 2017 Fall Symposium on âĂIJAIHRIâĂİ 19-26.
  2. Elizalde, F.; Sucar, L. E.; Luque, M.; Diez, J.; and Reyes, A. 2008. Policy explanation in factored markov decision processes. In Proceedings of the 4th European Workshop on Probabilistic Graphical Models (PGM 2008) , 97-104.
  3. Juozapaitis, Z.; Koul, A.; Ferm, A.; Erwig, M.; and Doshi-Velez, F. 2019. Explainable reinforcement learning via reward decomposition. In Miller, T.; Weber, R.; and Magazzeni, D., eds., Proceedings of the IJCAI 2019 Workshop on Explainable Artificial Intelligence , 47-53.
  4. Miller, T. 2018a. Contrastive explanation: A structuralmodel approach. arXiv preprint arXiv:1811.03163 . · arXiv
  5. Mnih, V.; Kavukcuoglu, K.; Silver, D.; Rusu, A. A.; Veness, J.; Bellemare, M. G.; Graves, A.; Riedmiller, M.; Fidjeland, A. K.; Ostrovski, G.; et al. 2015. Humanlevel control through deep reinforcement learning. Nature 518(7540):529.

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Authors
Madumal, P., Miller, T., Sonenberg, L., & Vetere, F.
Affiliations
The University of Melbourne (AU)
Venue
Proceedings of the AAAI Conference on Artificial Intelligence
Published
2020-04-03
Volume
34
Issue
03
Pages
2493-2500
ISSN
  • 2159-5399 (ISSN-L)
  • 2374-3468
OpenAlex
W2945022240
Cited by
58
References
31
Citations by year
2025: 3 · 2024: 3 · 2023: 10 · 2022: 9 · 2021: 15 · 2020: 17 · 2019: 1
FWCI
4.87
Type
conference paper
Language
en
Open access
Locations
  • Proceedings of the AAAI Conference on Artificial Intelligence (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • University of Melbourne
  • Australian Research Council (DP190103414)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Explainable Artificial Intelligence (XAI)
  • Physical Sciences › Computer Science › Artificial Intelligence › Bayesian Modeling and Causal Inference
  • Physical Sciences › Computer Science › Artificial Intelligence › Reinforcement Learning in Robotics
Keywords
explainable reinforcement learning, causal models, structural causal models, counterfactual reasoning, model-free reinforcement learning, causal explanation, trust in AI, StarCraft II, real-time strategy games, human-AI interaction

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