Groupe d’études et de recherche en analyse des décisions


Using Local Search to Speed Up Filtering Algorithms for Some NP-Hard Constraints

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This paper proposes to use local search inside filtering algorithms of combinatorial structures for which achieving a desired level of consistency is too computationally expensive. Local search quickly provides supports for many variable-value pairs, thus reducing the effort required to check and potentially filter the rest of them. The idea is demonstrated on the SomeDifferent constraint, a graph coloring substructure. An experimental evaluation confirms its significant computational gain in many cases.

, 18 pages