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Oral
Modelling Behavioural Diversity for Learning in Open-Ended Games
Nicolas Perez-Nieves · Yaodong Yang · Oliver Slumbers · David Mguni · Ying Wen · Jun Wang

Wed Jul 21 07:00 AM -- 07:20 AM (PDT) @ None

Promoting behavioural diversity is critical for solving games with non-transitive dynamics where strategic cycles exist, and there is no consistent winner (e.g., Rock-Paper-Scissors). Yet, there is a lack of rigorous treatment for defining diversity and constructing diversity-aware learning dynamics. In this work, we offer a geometric interpretation of behavioural diversity in games and introduce a novel diversity metric based on \emph{determinantal point processes} (DPP). By incorporating the diversity metric into best-response dynamics, we develop \emph{diverse fictitious play} and \emph{diverse policy-space response oracle} for solving normal-form games and open-ended games. We prove the uniqueness of the diverse best response and the convergence of our algorithms on two-player games. Importantly, we show that maximising the DPP-based diversity metric guarantees to enlarge the \emph{gamescape} -- convex polytopes spanned by agents' mixtures of strategies. To validate our diversity-aware solvers, we test on tens of games that show strong non-transitivity. Results suggest that our methods achieve at least the same, and in most games, lower exploitability than PSRO solvers by finding effective and diverse strategies.

Author Information

Nicolas Perez-Nieves (Imperial College London)
Yaodong Yang (Huawei UK)
Oliver Slumbers (UCL)
David Mguni (Noah's Ark Laboratory, Huawei)
Ying Wen (Shanghai Jiao Tong University)
Jun Wang (UCL)

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