Improved Decision Rule Approximations for Multi-Stage Robust Optimization via Copositive Programming
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by
Guanglin Xu, Grani A. Hanasusanto
2021
Abstract
We study decision rule approximations for generic multi-stage robust linear
optimization problems. We consider linear decision rules for the case when the
objective coefficients, the recourse matrices, and the right-hand sides are
uncertain, and consider quadratic decision rules for the case when only the
right-hand sides are uncertain. The resulting optimization problems are NP-hard
but amenable to copositive programming reformulations that give rise to tight
conservative approximations. We further enhance these approximations through
new piecewise decision rule schemes. Finally, we prove that our proposed
approximations are tighter than the state-of-the-art schemes and demonstrate
their superiority through numerical experiments.
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