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Multi-agent reinforcement learning

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Two rival teams of agents face off in a MARL experiment

Multi-agent reinforcement learning (MARL) is a sub-field of reinforcement learning. It focuses on studying the behavior of multiple learning agents that coexist in a shared environment.[1] Each agent is motivated by its own rewards, and does actions to advance its own interests; in some environments these interests are opposed to the interests of other agents, resulting in complex group dynamics.

Multi-agent reinforcement learning is closely related to game theory and especially repeated games, as well as multi-agent systems. Its study combines the pursuit of finding ideal algorithms that maximize rewards with a more sociological set of concepts. While research in single-agent reinforcement learning is concerned with finding the algorithm that gets the biggest number of points for one agent, research in multi-agent reinforcement learning evaluates and quantifies social metrics, such as cooperation,[2] reciprocity,[3] equity,[4] social influence,[5] language[6] and discrimination.[7]

  1. ^ Stefano V. Albrecht, Filippos Christianos, Lukas Schäfer. Multi-Agent Reinforcement Learning: Foundations and Modern Approaches. MIT Press, 2024. https://www.marl-book.com/
  2. ^ Lowe, Ryan; Wu, Yi (2020). "Multi-Agent Actor-Critic for Mixed Cooperative-Competitive Environments". arXiv:1706.02275v4 [cs.LG].
  3. ^ Baker, Bowen (2020). "Emergent Reciprocity and Team Formation from Randomized Uncertain Social Preferences". NeurIPS 2020 proceedings. arXiv:2011.05373.
  4. ^ Hughes, Edward; Leibo, Joel Z.; et al. (2018). "Inequity aversion improves cooperation in intertemporal social dilemmas". NeurIPS 2018 proceedings. arXiv:1803.08884.
  5. ^ Jaques, Natasha; Lazaridou, Angeliki; Hughes, Edward; et al. (2019). "Social Influence as Intrinsic Motivation for Multi-Agent Deep Reinforcement Learning". Proceedings of the 35th International Conference on Machine Learning. arXiv:1810.08647.
  6. ^ Lazaridou, Angeliki (2017). "Multi-Agent Cooperation and The Emergence of (Natural) Language". ICLR 2017. arXiv:1612.07182.
  7. ^ Duéñez-Guzmán, Edgar; et al. (2021). "Statistical discrimination in learning agents". arXiv:2110.11404v1 [cs.LG].

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