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Combining VNS with constraint programming for solving anytime optimization problems


  • Loudni, Samir
  • Boizumault, Patrice


This paper presents an hybrid search method for solving on-line optimization problems that are modelled using the vcsp Valued Constraint Satisfaction Problems framework. To each constraint is associated a valuation representing the "cost to pay" when this constraint will be violated by a solution. Our method (VNS/LDS+CP) uses principles of VNS (Variable Neighborhood Search) and combines a partial tree search (Limited Discrepancy Search) with Constraint Propagation in order to compute local optima. Experiments on the CELAR benchmarks demonstrate significant improvements on other competing methods: LNS/CP/GR [Lobjois, L., Lemaitre, M., Verfaillie, G., 2000. Large neighbourhood search using constraint propagation and greedy reconstruction for valued csp resolution. In: Proceedings of the ECAI2000 Workshop on Modelling and Solving Problems with Constraints], another hybrid method using vcsps, and two standard versions of Simulated-Annealing [Li, Y.H., 1997. Directed annealing search in constraint satisfaction and optimization. Ph.D. thesis, Imperial College of Science, Department of Computing]: Quick and Medium. Moreover, VNS/LDS+CP clearly satisfies the key properties of anytime algorithms. Finally, VNS/LDS+CP has been successfully applied to a real-life on-line resource allocation problem in computer networks.

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  • Loudni, Samir & Boizumault, Patrice, 2008. "Combining VNS with constraint programming for solving anytime optimization problems," European Journal of Operational Research, Elsevier, vol. 191(3), pages 705-735, December.
  • Handle: RePEc:eee:ejores:v:191:y:2008:i:3:p:705-735

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    Cited by:

    1. Dubois-Lacoste, Jérémie & López-Ibáñez, Manuel & Stützle, Thomas, 2015. "Anytime Pareto local search," European Journal of Operational Research, Elsevier, vol. 243(2), pages 369-385.
    2. López-Ibáñez, Manuel & Stützle, Thomas, 2014. "Automatically improving the anytime behaviour of optimisation algorithms," European Journal of Operational Research, Elsevier, vol. 235(3), pages 569-582.

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