# Open Journal of Mathematical Optimization

Robust Combinatorial Optimization with Locally Budgeted Uncertainty
Open Journal of Mathematical Optimization, Volume 2 (2021), article no. 3, 18 p.

Budgeted uncertainty sets have been established as a major influence on uncertainty modeling for robust optimization problems. A drawback of such sets is that the budget constraint only restricts the global amount of cost increase that can be distributed by an adversary. Local restrictions, while being important for many applications, cannot be modeled this way.

We introduce a new variant of budgeted uncertainty sets, called locally budgeted uncertainty. In this setting, the uncertain parameters are partitioned, such that a classic budgeted uncertainty set applies to each part of the partition, called region.

In a theoretical analysis, we show that the robust counterpart of such problems for a constant number of regions remains solvable in polynomial time, if the underlying nominal problem can be solved in polynomial time as well. If the number of regions is unbounded, we show that the robust selection problem remains solvable in polynomial time, while also providing hardness results for other combinatorial problems.

In computational experiments using both random and real-world data, we show that using locally budgeted uncertainty sets can have considerable advantages over classic budgeted uncertainty sets.

Received:
Revised:
Accepted:
Published online:
DOI: 10.5802/ojmo.5
Keywords: robust optimization, combinatorial optimization, budgeted uncertainty
Marc Goerigk 1; Stefan Lendl 2, 3

1 Network and Data Science Management, University of Siegen, Siegen, Germany
2 Department of Operations and Information Systems, University of Graz, Austria
3 Institute of Discrete Mathematics, Graz University of Technology, Graz, Austria
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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Marc Goerigk; Stefan Lendl. Robust Combinatorial Optimization with Locally Budgeted Uncertainty. Open Journal of Mathematical Optimization, Volume 2 (2021), article  no. 3, 18 p. doi : 10.5802/ojmo.5. https://ojmo.centre-mersenne.org/articles/10.5802/ojmo.5/

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