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arXiv 2111.09263math.OC
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约束DC规划的罚函数法和增广拉格朗日法

Penalty and Augmented Lagrangian Methods for Constrained DC Programming

Zhaosong Lu, Zhe Sun, Zirui Zhou

摘要:

本文考虑了一类结构非光滑凸差分约束DC规划,其中目标和约束的第一凸分量是光滑函数和非光滑函数之和,第二凸分量是多个凸光滑函数的上确界.现有的求解该问题的方法通常收敛性保证较弱或需要一个可行的初始点。受最近工作的启发(数学运算。Res. 42(1):95- 118,2017 by Pang et al.),本文对所考虑的问题提出了两种强收敛保证的不可行方法。第一种是罚方法,它包括寻找一个近似的D-稳定点的一系列惩罚子问题。我们表明,任何可行的积累点的解决方案序列所产生的这种惩罚方法是一个B-平稳点的问题下,最弱的可能的假设,它满足逐点斯莱特约束规格(PSCQ)。第二个是增广拉格朗日(AL)方法,包括寻找一个近似的D-稳定点的一系列AL子问题。在与罚函数法相同的PSCQ条件下,证明了由AL方法生成的解序列的任何可行聚点都是问题的B-平稳点,并且它满足问题的KKT型最优性条件,同时还满足一组辅助Lagrange乘子序列的任何聚点.我们还提出了一个有效的逐次凸逼近方法计算的近似D-稳定点的惩罚和AL子问题。最后,通过数值实验验证了本文方法的有效性.

英文摘要:

In this paper we consider a class of structured nonsmooth difference-of-convex (DC) constrained DC program in which the first convex component of the objective and constraints is the sum of a smooth and nonsmooth functions while their second convex component is the supremum of finitely many convex smooth functions. The existing methods for this problem usually have a weak convergence guarantee or require a feasible initial point. Inspired by the recent work (Math Oper. Res. 42(1):95--118, 2017 by Pang et al.), in this paper we propose two infeasible methods with strong convergence guarantee for the considered problem. The first one is a penalty method that consists of finding an approximate D-stationary point of a sequence of penalty subproblems. We show that any feasible accumulation point of the solution sequence generated by such a penalty method is a B-stationary point of the problem under a weakest possible assumption that it satisfies a pointwise Slater constraint qualification (PSCQ). The second one is an augmented Lagrangian (AL) method that consists of finding an approximate D-stationary point of a sequence of AL subproblems. Under the same PSCQ condition as for the penalty method, we show that any feasible accumulation point of the solution sequence generated by such an AL method is a B-stationary point of the problem, and moreover, it satisfies a KKT type of optimality condition for the problem, together with any accumulation point of the sequence of a set of auxiliary Lagrangian multipliers. We also propose an efficient successive convex approximation method for computing an approximate D-stationary point of the penalty and AL subproblems. Finally, some numerical experiments are conducted to demonstrate the efficiency of our proposed methods.

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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