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Yuma Fujimoto

4 accepted papers

2025

Synchronization in Learning in Periodic Zero-Sum Games Triggers Divergence from Nash Equilibrium

AAAI 2025technical

Learning in zero-sum games studies a situation where multiple agents competitively learn their strategy. In such multi-agent learning, we often see that the strategies cycle around their optimum, i.e., Nash equilibrium. When a game periodically varies (called a ``periodic'' game), however, the Nash…

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2024

Memory Asymmetry Creates Heteroclinic Orbits to Nash Equilibrium in Learning in Zero-Sum Games

AAAI 2024technical

Learning in games considers how multiple agents maximize their own rewards through repeated games. Memory, an ability that an agent changes his/her action depending on the history of actions in previous games, is often introduced into learning to explore more clever strategies and discuss the decisi…

2023

Learning in Multi-Memory Games Triggers Complex Dynamics Diverging from Nash Equilibrium

IJCAI 2023poster

Repeated games consider a situation where multiple agents are motivated by their independent rewards throughout learning. In general, the dynamics of their learning become complex. Especially when their rewards compete with each other like zero-sum games, the dynamics often do not converge to their…