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Bi-objective Branch-and-Cut Algorithms Based on LP Relaxation and Bound Sets

Author

Listed:
  • Sune Lauth Gadegaard

    (Department of Economics and Business Economics, School of Business and Social Sciences, Aarhus University, DK-8210 Aarhus V, Denmark;)

  • Lars Relund Nielsen

    (Department of Economics and Business Economics, School of Business and Social Sciences, Aarhus University, DK-8210 Aarhus V, Denmark;)

  • Matthias Ehrgott

    (Department of Management Science, Lancaster University, Lancaster LA1 4YX, United Kingdom)

Abstract

Most real-world optimization problems are multi-objective by nature, with conflicting and incomparable objectives. Solving a multi-objective optimization problem requires a method that can generate all rational compromises between the objectives. This paper proposes two distinct bound set-based branch-and-cut algorithms for general bi-objective combinatorial optimization problems based on implicit and explicit lower-bound sets. The algorithm based on explicit lower-bound sets computes, for each branching node, a lower-bound set and compares it with an upper-bound set. The other fathoms branching nodes by generating a single point on the lower-bound set for each local nadir point. We outline several approaches for fathoming branching nodes, and we propose an updating scheme for the lower-bound sets that prevents us from solving the bi-objective linear programming relaxation of each branching node. To strengthen the lower-bound sets, we propose a bi-objective cutting-plane algorithm that adjusts the weights of the objective functions such that different parts of the feasible set are strengthened by cutting planes. In addition, we suggest an extension of the branching strategy “Pareto branching.” We prove the effectiveness of the algorithms through extensive computational results.

Suggested Citation

  • Sune Lauth Gadegaard & Lars Relund Nielsen & Matthias Ehrgott, 2019. "Bi-objective Branch-and-Cut Algorithms Based on LP Relaxation and Bound Sets," INFORMS Journal on Computing, INFORMS, vol. 31(4), pages 790-804, October.
  • Handle: RePEc:inm:orijoc:v:31:y:2019:i:4:p:790-804
    DOI: 10.1287/ijoc.2018.0846
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    References listed on IDEAS

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    Cited by:

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    4. Forget, Nicolas & Gadegaard, Sune Lauth & Nielsen, Lars Relund, 2022. "Warm-starting lower bound set computations for branch-and-bound algorithms for multi objective integer linear programs," European Journal of Operational Research, Elsevier, vol. 302(3), pages 909-924.

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