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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Automatic Detection of Variable and Value Symmetries
verfasst von : Jean-François Puget
Erschienen in: Principles and Practice of Constraint Programming - CP 2005
Verlag: Springer Berlin Heidelberg
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Many symmetry breaking techniques assume that the symmetries of a CSP are given as input in addition to the CSP itself. We present a method that can be used to detect all the symmetries of a CSP. This method constructs a graph that has the same symmetries as the CSP. Then, generators for the symmetry group are computed using a graph automorphism algorithm. This method improves and extends previous work in order to cover global constraints, arithmetic expressions and value symmetries. We show that this method is able to find symmetries for examples that were thought to be too convoluted for automated detection. We also show that the overhead of symmetry detection is quite negligible, even on very large instances. We present a comprehensive set of examples where automated symmetry detection is coupled with symmetry breaking techniques.