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arXiv 2003.08880math.OCcs.NAmath.NA
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弱凸目标凸约束规划的增广拉格朗日一阶方法

Augmented Lagrangian based first-order methods for convex-constrained programs with weakly-convex objective

Zichong Li, Yangyang Xu

摘要:

一阶方法在求解大规模问题中得到了广泛的应用。现有的大多数工作集中在无约束或简单约束的问题。最近的一些工作已经研究了FOMs的问题,复杂的功能约束。在本文中,我们设计了一种新的增广拉格朗日(AL)为基础的FOM解决非凸目标和凸约束函数的问题。新方法遵循邻近点方法的框架。在近似求解PP子问题时,混合使用不精确AL方法(iALM)和二次罚函数法,而后者总是由iALM提供估计乘子。我们展示了所提出的方法实现$\varepsilon$ -KKT点的复杂性结果$O(\varepsilon^{-\frac{5}{2}}|\log\varepsilon|)$。这是最著名的结果。理论上,混合方法具有较低的迭代复杂度要求比它的对应物,只使用iALM解决PP子问题,数值上,它可以执行显着优于纯基于惩罚的方法。对非凸线性约束二次规划和非凸QCQP进行了数值实验。数值结果表明,所提出的方法比现有的效率。

英文摘要:

First-order methods (FOMs) have been widely used for solving large-scale problems. A majority of existing works focus on problems without constraint or with simple constraints. Several recent works have studied FOMs for problems with complicated functional constraints. In this paper, we design a novel augmented Lagrangian (AL) based FOM for solving problems with non-convex objective and convex constraint functions. The new method follows the framework of the proximal point (PP) method. On approximately solving PP subproblems, it mixes the usage of the inexact AL method (iALM) and the quadratic penalty method, while the latter is always fed with estimated multipliers by the iALM. We show a complexity result of $O(\varepsilon^{-\frac{5}{2}}|\log\varepsilon|)$ for the proposed method to achieve an $\varepsilon$-KKT point. This is the best known result. Theoretically, the hybrid method has lower iteration-complexity requirement than its counterpart that only uses iALM to solve PP subproblems, and numerically, it can perform significantly better than a pure-penalty-based method. Numerical experiments are conducted on nonconvex linearly constrained quadratic programs and nonconvex QCQP. The numerical results demonstrate the efficiency of the proposed methods over existing ones.

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