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arXiv 1102.3879cs.GT
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关于图上对策的模仿策略

On the Imitation Strategy for Games on Graphs

Colin Cooper, Martin Dyer, Velumailum Mohanaraj

摘要:

在进化博弈论中,重复的两人博弈被用来研究自然选择下种群的策略进化。由于图上博弈的演化在很大程度上依赖于相互作用的结构,因此,人们对图上博弈的研究越来越感兴趣。在这种情况下,玩家占据图的顶点,只与他们的近邻玩游戏。各种进化动力学已经研究了不同的游戏在此设置。然而,由于分析的复杂性,这一领域的大部分工作都是实验性的。本文旨在通过提供严格的分析,有助于更全面的理解。研究了两类图:圈图和完全图的模仿动力学。我们专注于三个著名的社会困境,即囚徒困境,雄鹿狩猎和雪堆游戏。为了完整性,我们也考虑所谓的和谐博弈。我们的分析表明,在周期上,所有四个博弈都收敛得很快,无论是完全合作还是完全背叛。在完全图上,除了雪堆博弈之外,所有博弈都收敛得很快,要么合作,要么背叛。Snowdrift游戏很快达到了一个亚稳态,合作者和背叛者共存。它将收敛到合作或背叛后,只有在这个状态下,这是指数的大小,n,图。在特殊情况下,它将无限期地保持这种状态。我们的理论结果得到了实验研究的支持。

英文摘要:

In evolutionary game theory, repeated two-player games are used to study strategy evolution in a population under natural selection. As the evolution greatly depends on the interaction structure, there has been growing interests in studying the games on graphs. In this setting, players occupy the vertices of a graph and play the game only with their immediate neighbours. Various evolutionary dynamics have been studied in this setting for different games. Due to the complexity of the analysis, however, most of the work in this area is experimental. This paper aims to contribute to a more complete understanding, by providing rigorous analysis. We study the imitation dynamics on two classes of graph: cycles and complete graphs. We focus on three well known social dilemmas, namely the Prisoner's Dilemma, the Stag Hunt and the Snowdrift Game. We also consider, for completeness, the so-called Harmony Game. Our analysis shows that, on the cycle, all four games converge fast, either to total cooperation or total defection. On the complete graph, all but the Snowdrift game converge fast, either to cooperation or defection. The Snowdrift game reaches a metastable state fast, where cooperators and defectors coexist. It will converge to cooperation or defection only after spending time in this state which is exponential in the size, n, of the graph. In exceptional cases, it will remain in this state indefinitely. Our theoretical results are supported by experimental investigations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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