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Proteus: A Hierarchical Portfolio of Solvers and Transformations (CPAIOR'14)

Publication Type: 
Refereed Conference Meeting Proceeding
Abstract: 
In recent years, portfolio approaches to solving SAT problems and CSPs have become increasingly common. There are also a number of different encodings for representing CSPs as SAT instances. In this paper, we leverage advances in both SAT and CSP solving to present a novel hierarchical portfolio-based approach to CSP solving, which we call Proteus, that does not rely purely on CSP solvers. Instead, it may decide that it is best to encode a CSP problem instance into SAT, selecting an appropriate encoding and a corresponding SAT solver. Our experimental evaluation used an instance of Proteus that involved four CSP solvers, three SAT encodings, and six SAT solvers, evaluated on the most challenging problem instances from the CSP solver competitions, involving global and intensional constraints. We show that significant performance improvements can be achieved by Proteus obtained by exploiting alternative view-points and solvers for combinatorial problem-solving.
Conference Name: 
Integration of AI and OR Techniques in Constraint Programming - 11th International Conference, CPAIOR 2014
Proceedings: 
Springer
Digital Object Identifer (DOI): 
10.1007/978-3-319-07046-9_22
Publication Date: 
19/05/2014
Volume: 
8451
Pages: 
301-317
Conference Location: 
Ireland
Institution: 
National University of Ireland, Cork (UCC)
Open access repository: 
Yes
Publication document: