Abstract
Orthogonal arrays are very important combinatorial objects which can be used in software testing and other areas. Mathematical methods for constructing such arrays have been studied extensively in the past decades. In contrast, computer search techniques, in particular exhaustive search methods, are rarely used to solve the problem. In this paper, we present an algorithm which finds orthogonal arrays of given sizes or shows their non-existence. The algorithm is essentially a backtrack search procedure, but enhanced with some novel symmetry breaking (isomorphism elimination) techniques. The orthogonal array is generated column by column, and the constraints are checked by an efficient SAT solver or pseudo-Boolean constraint solver. We have implemented a tool called BOAS (Backtrack-style OA Searcher) using MiniSat and PBS. Experimental results show that our tool can find many orthogonal arrays quickly, especially those with strength higher than 2.
This work is partially supported by the National Natural Science Foundation of China (NSFC) under Grant No. 60673044 and 60633010.
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Ma, F., Zhang, J. (2008). Finding Orthogonal Arrays Using Satisfiability Checkers and Symmetry Breaking Constraints. In: Ho, TB., Zhou, ZH. (eds) PRICAI 2008: Trends in Artificial Intelligence. PRICAI 2008. Lecture Notes in Computer Science(), vol 5351. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89197-0_25
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DOI: https://doi.org/10.1007/978-3-540-89197-0_25
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