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Evolving Keepaway Soccer Players through Task Decomposition

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Genetic and Evolutionary Computation — GECCO 2003 (GECCO 2003)

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Abstract

In some complex control tasks, learning a direct mapping from an agent’s sensors to its actuators is very difficult. For such tasks, decomposing the problem into more manageable components can make learning feasible. In this paper, we provide a task decomposition, in the form of a decision tree, for one such task. We investigate two different methods of learning the resulting subtasks. The first approach, layered learning, trains each component sequentially in its own training environment, aggressively constraining the search. The second approach, coevolution, learns all the subtasks simultaneously from the same experiences and puts few restrictions on the learning algorithm. We empirically compare these two training methodologies using neuro-evolution, a machine learning algorithm that evolves neural networks. Our experiments, conducted in the domain of simulated robotic soccer keepaway, indicate that neuro-evolution can learn effective behaviors and that the less constrained coevolutionary approach outperforms the sequential approach. These results provide new evidence of coevolution’s utility and suggest that solution spaces should not be over-constrained when supplementing the learning of complex tasks with human knowledge.

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Whiteson, S., Kohl, N., Miikkulainen, R., Stone, P. (2003). Evolving Keepaway Soccer Players through Task Decomposition. In: Cantú-Paz, E., et al. Genetic and Evolutionary Computation — GECCO 2003. GECCO 2003. Lecture Notes in Computer Science, vol 2723. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45105-6_41

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  • DOI: https://doi.org/10.1007/3-540-45105-6_41

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  • Print ISBN: 978-3-540-40602-0

  • Online ISBN: 978-3-540-45105-1

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