Exploring Directional Path-Consistency for Solving Constraint Networks
Kong, Shufeng1; Li, Sanjiang1,2; Sioutis, Michael3
Source PublicationCOMPUTER JOURNAL
AbstractAmong the local consistency techniques used for solving constraint networks, path-consistency (PC) has received a great deal of attention. However, enforcing PC is computationally expensive and sometimes unnecessary. Directional PC (DPC) is a weaker notion of PC that considers a given variable ordering and can thus be enforced more efficiently than PC. This paper shows that (the DPC enforcing algorithm of Dechter and Pearl) decides the constraint satisfaction problem (CSP) of a constraint language if it is complete and has the variable elimination property (VEP). However, we also show that no complete VEP constraint language can have a domain with more than two values. We then present a simple variant of the algorithm, called, and show that the CSP of a constraint language can be decided by if it is closed under a majority operation. In fact, is sufficient for guaranteeing backtrack-free search for such constraint networks. Examples of majority-closed constraint classes include the classes of connected row-convex constraints and tree-preserving constraints, which have found applications in various domains, such as scene labeling, temporal reasoning, geometric reasoning and logical filtering. Our experimental evaluations show that significantly outperforms the state- of-the-art algorithms for solving majority-closed constraints.
Keywordpath-consistency directional path-consistency constraint networks
Funding ProjectNSFC[11671244] ; European-funded H2020 project MoveCare[732158]
WOS Research AreaComputer Science
WOS SubjectComputer Science, Hardware & Architecture ; Computer Science, Information Systems ; Computer Science, Software Engineering ; Computer Science, Theory & Methods
WOS IDWOS:000443557300007
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Document Type期刊论文
Corresponding AuthorKong, Shufeng
Affiliation1.Univ Technol Sydney, FELT, QSI, 81 Broadway, Ultimo, NSW 2007, Australia
2.Chinese Acad Sci, UTS AMSS Joint Res Lab, AMSS, 55 East Zhongguancun Rd, Beijing 100190, Peoples R China
3.Orebro Univ, AASS, Fak Gatan 1, S-70281 Orebro, Sweden
Recommended Citation
GB/T 7714
Kong, Shufeng,Li, Sanjiang,Sioutis, Michael. Exploring Directional Path-Consistency for Solving Constraint Networks[J]. COMPUTER JOURNAL,2018,61(9):1338-1350.
APA Kong, Shufeng,Li, Sanjiang,&Sioutis, Michael.(2018).Exploring Directional Path-Consistency for Solving Constraint Networks.COMPUTER JOURNAL,61(9),1338-1350.
MLA Kong, Shufeng,et al."Exploring Directional Path-Consistency for Solving Constraint Networks".COMPUTER JOURNAL 61.9(2018):1338-1350.
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