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arXiv 2006.14901math.OCcs.LGeess.SPstat.ML
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对非光滑Optimization平稳性概念的理解

Understanding Notions of Stationarity in Non-Smooth Optimization

The Chinese University of Hong Kong(香港中文大学)

Jiajin Li, Anthony Man-Cho So, Wing-Kin Ma

摘要:

信号处理和机器学习中的许多当代应用产生了结构化非凸非光滑最优化问题,这些问题通常可以通过简单的迭代法非常有效地解决。理解这种现象的关键之一,事实上,甚至对专家来说也是一个非常困难的难题,就在于研究所讨论问题的“驻点”。与平稳优化不同,平稳点的定义是相当标准的,在非平稳优化中有无数的平稳性定义。本文对几类重要的非凸非光滑函数给出了不同的平稳性概念,并讨论了它们的几何解释,进一步阐明了这些不同概念之间的关系。然后,我们展示了这些结构在一些代表性的应用程序的相关性,以及它们如何影响迭代法的性能来解决这些应用程序。

英文摘要:

Many contemporary applications in signal processing and machine learning give rise to structured non-convex non-smooth optimization problems that can often be tackled by simple iterative methods quite effectively. One of the keys to understanding such a phenomenon---and, in fact, one of the very difficult conundrums even for experts---lie in the study of "stationary points" of the problem in question. Unlike smooth optimization, for which the definition of a stationary point is rather standard, there is a myriad of definitions of stationarity in non-smooth optimization. In this article, we give an introduction to different stationarity concepts for several important classes of non-convex non-smooth functions and discuss the geometric interpretations and further clarify the relationship among these different concepts. We then demonstrate the relevance of these constructions in some representative applications and how they could affect the performance of iterative methods for tackling these applications.

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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