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arXiv 1702.00880math.OC
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结合渐进套期保值和Frank-Wolfe方法计算随机混合整数规划的Lagrange对偶界

Combining Progressive Hedging with a Frank-Wolfe Method to Compute Lagrangian Dual Bounds in Stochastic Mixed-Integer Programming

Natashia Boland, Jeffrey Christiansen, Brian Dandurand, Andrew Eberhard, Jeff Linderoth, James Luedtke

摘要:

提出了一种新的计算随机混合整数规划(SMIP)拉格朗日对偶值的原始对偶法,该规划是通过放松非预期性约束而形成的。这种对偶在SMIP的分解方法中被广泛使用。该算法依赖于众所周知的渐进式对冲方法,但与以往的渐进式对冲方法SMIP,我们的算法可以被证明是收敛到最佳拉格朗日对偶值。在新算法的关键改进是一个优化的线性化步骤,类似于在经典的Frank-Wolfe方法中所采取的内环。数值结果表明,我们的新算法的经验优于标准的实现渐进对冲获得SMIP的界限。

英文摘要:

We present a new primal-dual algorithm for computing the value of the Lagrangian dual of a stochastic mixed-integer program (SMIP) formed by relaxing its nonanticipativity constraints. This dual is widely used in decomposition methods for the solution of SMIPs. The algorithm relies on the well-known progressive hedging method, but unlike previous progressive hedging approaches for SMIP, our algorithm can be shown to converge to the optimal Lagrangian dual value. The key improvement in the new algorithm is an inner loop of optimized linearization steps, similar to those taken in the classical Frank-Wolfe method. Numerical results demonstrate that our new algorithm empirically outperforms the standard implementation of progressive hedging for obtaining bounds in SMIP.

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