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arXiv 2209.00499math.OC
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一级和两级鲁棒Optimization的最优场景约简

Optimal Scenario Reduction for One- and Two-Stage Robust Optimization

Marc Goerigk, Mohammad Khosravi

摘要:

鲁棒优化通常遵循最坏情况的观点,其中单个场景可以确定给定解决方案的目标值。因此,减少不确定性集的大小而不太改变所得目标值是一项具有挑战性的任务。另一方面,具有许多场景的鲁棒最优化问题往往难以求解,特别是对于两阶段问题。因此,减少不确定性集可能是在合理的时间内找到解决方案的核心。我们提出的方案减少的方法,保证所产生的强大的解决方案的性能。一阶段和两阶段鲁棒优化的场景约简问题被构造为仅依赖于不确定性集而不依赖于潜在的决策问题的最优化问题。实验结果表明,减少不确定性集的目标值与原始目标值密切相关,从而比使用通用聚类方法(如K-means)时得到更好的解决方案。

英文摘要:

Robust optimization typically follows a worst-case perspective, where a single scenario may determine the objective value of a given solution. Accordingly, it is a challenging task to reduce the size of an uncertainty set without changing the resulting objective value too much. On the other hand, robust optimization problems with many scenarios tend to be hard to solve, in particular for two-stage problems. Hence, a reduced uncertainty set may be central to find solutions in reasonable time. We propose scenario reduction methods that give guarantees on the performance of the resulting robust solution. Scenario reduction problems for one- and two-stage robust optimization are framed as optimization problems that only depend on the uncertainty set and not on the underlying decision making problem. Experimental results indicate that objective values for the reduced uncertainty sets are closely correlated to original objective values, resulting in better solutions than when using general-purpose clustering methods such as K-means.

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