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arXiv 1608.08883math.OCcs.NAmath.NA
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一种带有线搜索的首次-order 原-对偶算法

A first-order primal-dual algorithm with linesearch

Graz University of Technology(格拉茨工业大学)

Yura Malitsky, Thomas Pock

AI总结:

本文提出了一种带有线搜索的原-对偶方法,通过仅更新对偶(或原)变量来提高效率,并在正则化最小二乘问题中无需额外矩阵-向量乘法。该方法在标准假设下收敛,且在强凸情况下具有更快的收敛速度。

摘要:

本文提出了一种带有线搜索的原-对偶方法。每次线搜索迭代仅需更新对偶(或原)变量。对于许多问题,特别是正则化最小二乘问题,线搜索不需要额外的矩阵-向量乘法。我们证明了在标准假设下该方法的收敛性,并展示了该方法的ergodic $O(1/N)$收敛率。如果其中一个或两个近似函数是强凸的,我们修改基本方法以获得更快的收敛率。最后,我们为带有额外光滑项的鞍点问题提出了一种线搜索。几个数值实验验证了所提方法的有效性。

英文摘要:

The paper proposes a linesearch for a primal-dual method. Each iteration of the linesearch requires to update only the dual (or primal) variable. For many problems, in particular for regularized least squares, the linesearch does not require any additional matrix-vector multiplications. We prove convergence of the proposed method under standard assumptions. We also show an ergodic $O(1/N)$ rate of convergence for our method. In case one or both of the prox-functions are strongly convex, we modify our basic method to get a better convergence rate. Finally, we propose a linesearch for a saddle point problem with an additional smooth term. Several numerical experiments confirm the efficiency of our proposed methods.

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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