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arXiv 2104.03043math.OCcs.DMcs.DS
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具有两阶段不确定性的两阶段鲁棒最优化问题

Two-Stage Robust Optimization Problems with Two-Stage Uncertainty

Marc Goerigk, Stefan Lendl, Lasse Wulf

摘要:

我们考虑两阶段鲁棒最优化问题,这可以被看作是决策者和对手之间的博弈。在决策者确定部分解决方案后,对手从指定的不确定性集中选择一个场景。之后,决策者可以通过完成部分第一阶段解决方案来对这种情况做出反应。我们通过在第二决策阶段之后添加另一个对手阶段来扩展这种经典设置,这导致最小-最大-最小-最大问题,从而将两阶段设置进一步推向更一般的多阶段问题。我们专注于预算的不确定性集,并考虑连续和离散的情况。对于前者,我们表明,广泛的强大的组合最优化问题可以分解成多项式的许多子问题,可以解决在多项式时间的情况下,例如(\textsc{representative})\textsc{selection}。对于后者,我们证明了一系列问题的NP-硬度,但注意到第一阶段和第二阶段对抗成本相等的特殊情况可以在多项式时间内解决。

英文摘要:

We consider two-stage robust optimization problems, which can be seen as games between a decision maker and an adversary. After the decision maker fixes part of the solution, the adversary chooses a scenario from a specified uncertainty set. Afterwards, the decision maker can react to this scenario by completing the partial first-stage solution to a full solution. We extend this classic setting by adding another adversary stage after the second decision-maker stage, which results in min-max-min-max problems, thus pushing two-stage settings further towards more general multi-stage problems. We focus on budgeted uncertainty sets and consider both the continuous and discrete case. For the former, we show that a wide range of robust combinatorial optimization problems can be decomposed into polynomially many subproblems, which can be solved in polynomial time for example in the case of (\textsc{representative}) \textsc{selection}. For the latter, we prove NP-hardness for a wide range of problems, but note that the special case where first- and second-stage adversarial costs are equal can remain solvable in polynomial time.

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