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arXiv 1909.06960math.OC
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低秩矩阵恢复的正则化参数选择

Regularization parameter selection for low rank matrix recovery

Pan Shang, Lingchen Kong

摘要:

低秩矩阵恢复是许多应用的热点,但它是一个NP难问题。处理这个问题的一个流行的方法是解决它的凸松弛,核范数正则化最小化问题(NRM),其中包括LASSO作为一个特殊情况。在向量情形下,给出了LASSO正则化参数的选择结果,如筛选规则等,提高了算法的效率。然而,对于矩阵情况下的NRM,没有相应的参数选择结果。在本文中,我们建立了一个新的规则来选择正则化参数的NRM的对偶理论的帮助下。该规则要求当期望解的秩不超过给定的常数时,正则化参数可以很容易地由NRM及其对偶问题的可行点来选择。特别地,我们将这一思想应用于最小二乘和Huber函数的NRM,并建立了正则化参数的计算公式。最后,我们报告了一些信号形状的数值结果,表明我们提出的规则有效地缩小了正则化参数的区间。

英文摘要:

Low rank matrix recovery is the focus of many applications, but it is a NP-hard problem. A popular way to deal with this problem is to solve its convex relaxation, the nuclear norm regularized minimization problem (NRM), which includes LASSO as a special case. There are some regularization parameter selection results for LASSO in vector case, such as screening rules, which improve the efficiency of the algorithms. However, there are no corresponding parameter selection results for NRM in matrix case. In this paper, we build up a novel rule to choose the regularization parameter for NRM under the help of duality theory. This rule claims that the regularization parameter can be easily chosen by feasible points of NRM and its dual problem, when the rank of the desired solution is no more than a given constant. In particular, we apply this idea to NRM with least square and Huber functions, and establish the easily calculated formula of regularization parameters. Finally, we report numerical results on some signal shapes, which state that our proposed rule shrinks the interval of the regularization parameter efficiently.

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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