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arXiv 2007.08387cs.LOstat.ML
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多项式时间内随机奇偶对策的求解

Solving Random Parity Games in Polynomial Time

Richard Combes, Mikael Touati

摘要:

我们考虑随机奇偶对策的求解问题。我们证明了奇偶游戏exibit的相变阈值以上$d_P$,所以当定义游戏的图的程度有一个度$d > d_P$,然后存在一个多项式时间算法,解决了游戏的高概率时,节点数趋于无穷大。我们进一步提出了SWCP(自赢循环传播)算法,并表明,当度足够大时,SWCP解决了高概率的游戏。此外,SWCP的复杂度是多项式$O\Big(|{\cal V}|^2 + |{\cal V}||{\cal E}|\Big)$。SWCP的设计基于参与者各自子图中出现特定类型循环的阈值。我们进一步表明,非稀疏的游戏可以解决时间$O(|{\cal V}|)$具有很高的概率,并发出一个猜想的硬度的$d=2$的情况下。

英文摘要:

We consider the problem of solving random parity games. We prove that parity games exibit a phase transition threshold above $d_P$, so that when the degree of the graph that defines the game has a degree $d > d_P$ then there exists a polynomial time algorithm that solves the game with high probability when the number of nodes goes to infinity. We further propose the SWCP (Self-Winning Cycles Propagation) algorithm and show that, when the degree is large enough, SWCP solves the game with high probability. Furthermore, the complexity of SWCP is polynomial $O\Big(|{\cal V}|^2 + |{\cal V}||{\cal E}|\Big)$. The design of SWCP is based on the threshold for the appearance of particular types of cycles in the players' respective subgraphs. We further show that non-sparse games can be solved in time $O(|{\cal V}|)$ with high probability, and emit a conjecture concerning the hardness of the $d=2$ case.

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