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arXiv 2304.04028math.OC
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使用Mifflin线搜索的非光滑非凸优化下降次梯度方法

A descent subgradient method using Mifflin line search for nonsmooth nonconvex optimization

Morteza Maleknia, Majid Soleimani-damaneh

AI总结:

提出一种用于局部Lipschitz非光滑非凸优化的下降次梯度算法,通过迭代近似Goldstein次微分并采用Mifflin线搜索两点变体寻找下降方向,证明了全局收敛性且无需算法修改即可处理非凸性。

摘要:

我们提出了一种下降次梯度算法,用于极小化一个实函数,假设该函数是局部Lipschitz的,但不一定光滑或凸。为了找到有效的下降方向,通过一个迭代过程来近似Goldstein次微分。该方法采用了一种新的Mifflin线搜索两点变体,其中次梯度是任意的。因此,该线搜索过程易于实现。此外,与bundle方法相比,二次子问题具有简单的结构,并且为了处理非凸性,所提出的方法不需要进行算法修改。我们研究了该方法的全局收敛性,并证明在目标函数f是弱上半光滑的假设下,生成序列的任何聚点都是Clarke稳定的。我们在一系列学术和半学术测试问题上展示了所提出算法的效率和有效性。

英文摘要:

We propose a descent subgradient algorithm for minimizing a real function, assumed to be locally Lipschitz, but not necessarily smooth or convex. To find an effective descent direction, the Goldstein subdifferential is approximated through an iterative process. The method enjoys a new two-point variant of Mifflin line search in which the subgradients are arbitrary. Thus, the line search procedure is easy to implement. Moreover, in comparison to bundle methods, the quadratic subproblems have a simple structure, and to handle nonconvexity the proposed method requires no algorithmic modification. We study the global convergence of the method and prove that any accumulation point of the generated sequence is Clarke stationary, assuming that the objective $f$ is weakly upper semismooth. We illustrate the efficiency and effectiveness of the proposed algorithm on a collection of academic and semi-academic test 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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