The Complexity of All-switches Strategy Improvement
The Complexity of All-switches Strategy Improvement
复制标题
全交换机策略改进的复杂性
DOI:
10.23638/lmcs-14(4:9)2018
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Rahul Savani
中科院分区:
文献类型:
--
作者:
John Fearnley;Rahul Savani
Strategy improvement is a widely-used and well-studied class of algorithms for solving graph-based infinite games. These algorithms are parametrized by a switching rule, and one of the most natural rules is "all switches" which switches as many edges as possible in each iteration. Continuing a recent line of work, we study all-switches strategy improvement from the perspective of computational complexity. We consider two natural decision problems, both of which have as input a game G, a starting strategy s, and an edge e. The problems are: 1. The edge switch problem, namely, is the edge e ever switched by all-switches strategy improvement when it is started from s on game G? 2. The optimal strategy problem, namely, is the edge e used in the final strategy that is found by strategy improvement when it is started from s on game G? We show PSPACE-completeness of the edge switch problem and optimal strategy problem for the following settings: Parity games with the discrete strategy improvement algorithm of Voge and Jurdzinski; mean-payoff games with the gain-bias algorithm [11, 33]; and discounted-payoff games and simple stochastic games with their standard strategy improvement algorithms. We also show PSPACE-completeness of an analogous problem to edge switch for the bottom-antipodal algorithm for Acyclic Unique Sink Orientations on Cubes.
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DOI:
10.1007/978-3-642-20807-2_16
发表时间:
2011-06
期刊:
--
影响因子:
--
作者:
Oliver Friedmann
通讯作者:
Oliver Friedmann
DOI:
10.2168/lmcs-7(3:23)2011
发表时间:
2011
期刊:
Log. Methods Comput. Sci.
影响因子:
--
作者:
Oliver Friedmann
通讯作者:
Oliver Friedmann
DOI:
10.1007/s10009-019-00509-3
发表时间:
2019-06-01
影响因子:
1.5
作者:
Fearnley, John;Jain, Sanjay;Wojtczak, Dominik
通讯作者:
Wojtczak, Dominik
DOI:
10.1145/3280847
发表时间:
2018
期刊:
ACM Transactions on Algorithms (TALG)
影响因子:
--
作者:
Disser;Skutella;Martin
通讯作者:
Martin