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arXiv 2302.01737math.OC
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ALSO-X #:分布鲁棒机会约束规划的一个更好的凸逼近

ALSO-X#: Better Convex Approximations for Distributionally Robust Chance Constrained Programs

Nan Jiang, Weijun Xie

摘要:

本文研究了分布鲁棒机会约束规划(DRCCP),其中不确定性约束必须满足Wasserstein模糊度集上所有概率分布的至少一个预先给定阈值的概率.由于DRCCP通常是非凸的,并且很难最优求解,研究人员一直在开发各种凸内近似。最近,ALSO-X已被证明优于条件风险值(CVaR)的近似的规则的机会约束规划时,确定性集是凸的。在这项工作中,我们放松了这个假设,通过引入一个新的ALSO-X方法来解决DRCCP。也就是说,在ALSO-X和CVaR近似的双层重构中,我们观察到,低层ALSO-X是低层CVaR近似的特殊情况,而高层CVaR近似比ALSO-X中的更受限制。这一观察促使我们提出ALSO-X,它仍然类似于一个双层公式-在较低级别的问题,我们采用更一般的CVaR近似,并为上层,我们选择较少限制ALSO-X。我们证明了ALSO-X总是优于CVaR近似,并且在规则机会约束规划和$\infty-$ Wasserstein型模糊集下优于ALSO-X。我们还提供了新的充分条件下,ALSO-X\#输出的最优解的DRCCP。我们提出的ALSO-X\#无线通信问题,并数值证明,解决方案的质量甚至可以比精确的方法。

英文摘要:

This paper studies distributionally robust chance constrained programs (DRCCPs), where the uncertain constraints must be satisfied with at least a probability of a prespecified threshold for all probability distributions from the Wasserstein ambiguity set. As DRCCPs are often nonconvex and challenging to solve optimally, researchers have been developing various convex inner approximations. Recently, ALSO-X has been proven to outperform the conditional value-at-risk (CVaR) approximation of a regular chance constrained program when the deterministic set is convex. In this work, we relax this assumption by introducing a new ALSO-X\# method for solving DRCCPs. Namely, in the bilevel reformulations of ALSO-X and CVaR approximation, we observe that the lower-level ALSO-X is a special case of the lower-level CVaR approximation and the upper-level CVaR approximation is more restricted than the one in ALSO-X. This observation motivates us to propose the ALSO-X\#, which still resembles a bilevel formulation -- in the lower-level problem, we adopt the more general CVaR approximation, and for the upper-level one, we choose the less restricted ALSO-X. We show that ALSO-X\# can always be better than the CVaR approximation and can outperform ALSO-X under regular chance constrained programs and type $\infty-$Wasserstein ambiguity set. We also provide new sufficient conditions under which ALSO-X\# outputs an optimal solution to a DRCCP. We apply the proposed ALSO-X\# to a wireless communication problem and numerically demonstrate that the solution quality can be even better than the exact method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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