所有有界宽度CSP的弱一致性概念
Weaker consistency notions for all the CSPs of bounded width
摘要:
Feder和Vardi [SICOMP'98]提出的所有有界宽度的约束满足问题的特征在[Bulatov'09]中得到了确认,并在[FOCS'09,JACM'14]中独立得到了确认。这两个证明都是基于(2,3)-一致性(在[FOCS'09]中使用布拉格一致性,直接在[Bulatov'09]中),这是昂贵的验证。我们引入了一个新的一致性概念,单点线性弧一致性(SLAC),并表明,它解决了相同的家庭的问题。SLAC弱于Singleton弧一致性(SAC),因此结果回答了[JLC'13]中的问题,表明SAC解决了所有有界宽度的问题。与此同时,验证弱一致性(甚至SAC)的问题比验证(2,3)-一致性的问题具有显著的计算优势,从而改进了求解有界宽度CSP的算法。
英文摘要:
The characterization of all the Constraint Satisfaction Problems of bounded width, proposed by Feder and Vardi [SICOMP'98], was confirmed in [Bulatov'09] and independently in [FOCS'09, JACM'14]. Both proofs are based on the (2,3)-consistency (using Prague consistency in [FOCS'09], directly in [Bulatov'09]) which is costly to verify. We introduce a new consistency notion, Singleton Linear Arc Consistency (SLAC), and show that it solves the same family of problems. SLAC is weaker than Singleton Arc Consistency (SAC) and thus the result answers the question from [JLC'13] by showing that SAC solves all the problems of bounded width. At the same time the problem of verifying weaker consistency (even SAC) offers significant computational advantages over the problem of verifying (2,3)-consistency which improves the algorithms solving the CSPs of bounded width.
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