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arXiv 1709.07073math.OC
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罚函数和增广拉格朗日函数整体精确性的统一方法I:参数精确性

A Unified Approach to the Global Exactness of Penalty and Augmented Lagrangian Functions I: Parametric Exactness

M. V. Dolgopolik

摘要:

在这两个部分的研究中,我们开发了一个统一的方法来分析各种惩罚和增广拉格朗日函数的有限维约束最优化问题的全局精确性。这种方法允许以简单和直接的方式验证给定的惩罚/增广拉格朗日函数是否是精确的,即,如果罚参数足够大,则该函数的无约束极小化问题是否等价于(在某种意义上)原始约束问题。我们的方法是基于所谓的本地化原则,减少了全球精确性的研究,本地分析所选择的价值函数附近的全球最优解。反过来,这种局部分析通常可以使用充分的最优性条件和约束规格来执行。在第一篇文章中,我们引入了全局参数精确性的概念,并导出了参数形式的局部化原理。利用这个版本的局部化原理,我们恢复现有的简单的充要条件的整体精确的线性罚函数,并为存在的增广拉格朗日乘子的Rockafellar-Wets的增广拉格朗日。另外,我们还得到了一般非线性罚函数的全局精确性和非线性二阶锥规划连续可微罚函数的全局精确性的全新的充要条件.我们简要讨论了如何构造一个连续可微的精确罚函数的非线性半定规划问题,以及。

英文摘要:

In this two-part study we develop a unified approach to the analysis of the global exactness of various penalty and augmented Lagrangian functions for finite-dimensional constrained optimization problems. This approach allows one to verify in a simple and straightforward manner whether a given penalty/augmented Lagrangian function is exact, i.e. whether the problem of unconstrained minimization of this function is equivalent (in some sense) to the original constrained problem, provided the penalty parameter is sufficiently large. Our approach is based on the so-called localization principle that reduces the study of global exactness to a local analysis of a chosen merit function near globally optimal solutions. In turn, such local analysis can usually be performed with the use of sufficient optimality conditions and constraint qualifications. In the first paper we introduce the concept of global parametric exactness and derive the localization principle in the parametric form. With the use of this version of the localization principle we recover existing simple necessary and sufficient conditions for the global exactness of linear penalty functions, and for the existence of augmented Lagrange multipliers of Rockafellar-Wets' augmented Lagrangian. Also, we obtain completely new necessary and sufficient conditions for the global exactness of general nonlinear penalty functions, and for the global exactness of a continuously differentiable penalty function for nonlinear second-order cone programming problems. We briefly discuss how one can construct a continuously differentiable exact penalty function for nonlinear semidefinite programming problems, as well.

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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