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自适应增广拉格朗日方法:算法和实际数值经验

Adaptive Augmented Lagrangian Methods: Algorithms and Practical Numerical Experience

Frank E. Curtis, Nicholas I. M. Gould, Hao Jiang, Daniel P. Robinson

摘要:

在本文中,我们考虑增广拉格朗日(AL)算法来解决大规模的非线性最优化问题,执行自适应策略更新的罚参数。我们的工作受到Curtis,Jiang和Robinson最近提出的自适应AL置信域方法的激励[Math. Prog.,DOI:10.1007/s10107-014-0784-y,2013]。本文的第一个焦点是一个新的变种的方法,采用线搜索,而不是一个置信域战略,其中一个关键的算法功能线搜索策略是使用的凸化分段二次模型的AL函数计算的搜索方向。我们证明了我们的线搜索算法的整体收敛保证与先前提出的置信域方法。本文的第二个重点是Matlab软件中的线搜索和置信域算法变体的实际性能,以及Lancelot软件中包含的自适应罚参数更新策略的实际性能。我们测试这些方法的问题,从CUTEst和COPS集合,以及具有挑战性的测试问题有关的最优潮流。我们的数值实验表明,自适应算法优于传统的AL方法的效率和可靠性。与传统的AL算法一样,自适应方法是无矩阵的,因此代表了解决极端规模问题的可行选择。

英文摘要:

In this paper, we consider augmented Lagrangian (AL) algorithms for solving large-scale nonlinear optimization problems that execute adaptive strategies for updating the penalty parameter. Our work is motivated by the recently proposed adaptive AL trust region method by Curtis, Jiang, and Robinson [Math. Prog., DOI: 10.1007/s10107-014-0784-y, 2013]. The first focal point of this paper is a new variant of the approach that employs a line search rather than a trust region strategy, where a critical algorithmic feature for the line search strategy is the use of convexified piecewise quadratic models of the AL function for computing the search directions. We prove global convergence guarantees for our line search algorithm that are on par with those for the previously proposed trust region method. A second focal point of this paper is the practical performance of the line search and trust region algorithm variants in Matlab software, as well as that of an adaptive penalty parameter updating strategy incorporated into the Lancelot software. We test these methods on problems from the CUTEst and COPS collections, as well as on challenging test problems related to optimal power flow. Our numerical experience suggests that the adaptive algorithms outperform traditional AL methods in terms of efficiency and reliability. As with traditional AL algorithms, the adaptive methods are matrix-free and thus represent a viable option for solving extreme-scale problems.

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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