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Improving set partitioning problem solutions by zooming around an improving direction

Author

Listed:
  • Abdelouahab Zaghrouti

    (Polytechnique Montréal and GERAD)

  • Issmail El Hallaoui

    (Polytechnique Montréal and GERAD)

  • François Soumis

    (Polytechnique Montréal and GERAD)

Abstract

In this paper, we introduce a general framework for vector space decompositions that decompose the set partitioning problem into a reduced problem, defined in the vector subspace generated by the columns corresponding to nonzero variables in the current integer solution, and a complementary problem, defined in the complementary vector subspace. We show that the integral simplex using decomposition algorithm (ISUD) developed in Zaghrouti et al. (Oper Res 62:435–449, 2014. https://doi.org/10.1287/opre.2013.1247) uses a particular decomposition, in which integrality is handled mainly in the complementary problem, to find a sequence of integer solutions with decreasing objective values leading to an optimal solution. We introduce a new algorithm using a new dynamic decomposition where integrality is handled only in the reduced problem, and the complementary problem is only used to provide descent directions, needed to update the decomposition. The new algorithm improves, at each iteration, the current integer solution by solving a reduced problem very small compared the original problem, that we define by zooming around the descent direction (provided by the complementary problem). This zooming algorithm is superior than ISUD on set partitioning instances from the transportation industry. It rapidly reaches optimal or near-optimal solutions for all instances including those considered very difficult for both ISUD and CPLEX.

Suggested Citation

  • Abdelouahab Zaghrouti & Issmail El Hallaoui & François Soumis, 2020. "Improving set partitioning problem solutions by zooming around an improving direction," Annals of Operations Research, Springer, vol. 284(2), pages 645-671, January.
    • Handle: RePEc:spr:annopr:v:284:y:2020:i:2:d:10.1007_s10479-018-2868-1
    DOI: 10.1007/s10479-018-2868-1
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    References listed on IDEAS

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