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arXiv 1906.07013math.OC
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带修正的一阶原始对偶法

First-order primal-dual algorithm with correction

Xiaokai Chang, Sanyang Liu

摘要:

研究了求解具有已知鞍点结构的凸优化问题的有效原始对偶法(PDA)的设计。我们提出了一种新的PDA与更大的可接受的范围内的参数和校正,从而导致更大的步长。利用线性算子的局部信息预测步长,并通过线性插值进行校正,使步长满足一个很弱的条件,甚至弱于生成序列的有界性。在一般情况下,以及当其中一个凸函数是强凸函数时,得到了收敛性和遍历收敛速度。数值实验表明,较大的步长和可接受的参数范围可以提高效率。

英文摘要:

This paper is devoted to the design of efficient primal-dual algorithm (PDA) for solving convex optimization problems with known saddle-point structure. We present a new PDA with larger acceptable range of parameters and correction, which result in larger step sizes. The step sizes are predicted by using a local information of the linear operator and corrected by linesearch to satisfy a very weak condition, even weaker than the boundedness of sequence generated. The convergence and ergodic convergence rate are established for general cases, and in case when one of the prox-functions is strongly convex. The numerical experiments illustrate the improvements in efficiency from the larger step sizes and acceptable range of parameters.

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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