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A Microstructure-Based Family of Tractable Classes for CSPs

机译:CSP的基于微结构的可操作类系列

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摘要

The study of tractable classes is an important issue in Artificial Intelligence, especially in Constraint Satisfaction Problems. In this context, the Broken Triangle Property (BTP) is a state-of-the-art microstructure-based tractable class which generalizes well-known and previously-defined tractable classes, notably the set of instances whose constraint graph is a tree. In this paper, we propose to extend and to generalize this class using a more general approach based on a parameter k which is a given constant. To this end, we introduce the k-BTP property (and the class of instances satisfying this property) such that we have 2-BTP = BTP, and for k > 2, k-BTP is a relaxation of BTP in the sense that k-BTP (∈) (k + 1)-BTP. Moreover, we show that if k-TW is the class of instances having tree-width bounded by a constant k, then k-TW C (k + 1)-BTP. Concerning tractability, we show that instances satisfying k-BTP and which are strong k-consistent are tractable, that is, can be recognized and solved in polynomial time. We also study the relationship between k-BTP and the approach of Naanaa who proposed a set-theoretical tool, known as the directional rank, to extend tractable classes in a parameterized way. Finally we propose an experimental study of 3-BTP which shows the practical interest of this class, particularly w.r.t. the practical solving of instances satisfying 3-BTP and for other instances, w.r.t. to backdoors based on this tractable class.
机译:易处理类的研究是人工智能中的重要问题,尤其是在约束满足问题中。在这种情况下,“破碎三角形特性”(BTP)是基于微结构的最新可处理类,可归纳出众所周知的和先前定义的可处理类,尤其是其约束图为树的实例集。在本文中,我们建议基于参数k(它是给定常数)使用更通用的方法来扩展和推广此类。为此,我们引入k-BTP属性(以及满足该属性的实例类别),使我们具有2-BTP = BTP,并且对于k> 2,在k的意义上,k-BTP是BTP的松弛。 -BTP(∈)(k +1)-BTP。而且,我们证明如果k-TW是树的宽度由常数k限定的实例的类别,则k-TW C(k +1)-BTP。关于可延展性,我们证明满足k-BTP且k一致强的实例是可延展的,即可以在多项式时间内识别和求解。我们还研究了k-BTP与Naanaa的方法之间的关系,Naanaa提出了一种集理论工具,称为定向等级,以参数化方式扩展可处理的类。最后,我们提出了一项对3-BTP的实验研究,该实验表明了此类的实际兴趣,尤其是w.r.t.满足3-BTP的实例的实际解决方案,对于其他实例,则为w.r.t.基于这个易处理的类的后门程序。

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  • 会议地点 Cork(IE)
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    IRIT, University of Toulouse Ⅲ, 31062 Toulouse, France;

    Aix-Marseille Universite, CNRS, ENSAM, Universite de Toulon, LSIS UMR 7296, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France;

    Aix-Marseille Universite, CNRS, ENSAM, Universite de Toulon, LSIS UMR 7296, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France;

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