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A Feasibility-Ensured Lagrangian Heuristic for General Decomposable Problems

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  • Kouhei Harada

    (NTTDATA Mathematical Systems Inc.)

Abstract

The Lagrangian relaxation method is a popular and useful tool to solve large-scale optimization problems with decomposable structures. A drawback of this approach is that a primal solution obtained by solving the Lagrangian relaxation problem is often primal infeasible even if an optimal dual solution is given. To recover primal feasibility, we rely on specialized heuristic-based approaches, each of which is tailored for a particular optimization problem. To overcome the difficulty, a general heuristic method has been proposed recently. The method ensures primal feasibility, but it is not tailored for some particular optimization problems. Furthermore, the method can estimate the gap of the objective between an optimal solution and the feasible solution obtained using the heuristic. Although the method provides important results, it relies on the assumption that both objective and constraint functions are concave. We generalize the results: the method ensures primal feasibility for a rather general class of problems. We have demonstrated that the fundamentally important requirement here is the extremity of the solution set of the Lagrangian relaxation problem. Our numerical experiments support the efficiency and validity of our generalized results.

Suggested Citation

  • Kouhei Harada, 2021. "A Feasibility-Ensured Lagrangian Heuristic for General Decomposable Problems," SN Operations Research Forum, Springer, vol. 2(4), pages 1-26, December.
    • Handle: RePEc:spr:snopef:v:2:y:2021:i:4:d:10.1007_s43069-021-00094-9
    DOI: 10.1007/s43069-021-00094-9
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    References listed on IDEAS

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