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arXiv 2108.01318math.OC
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大步长Davis-Yin分裂算法收敛性的直接证明

A direct proof of convergence of Davis-Yin splitting algorithm allowing larger stepsizes

Francisco J. Aragón-Artacho, David Torregrosa-Belén

摘要:

本文致力于Davis和Yin在2017年提出的分裂算法,用于计算三个最大单调算子之和的零点,其中一个是余强制的。我们提供了一个直接的证明,保证其收敛时的步长是小于四倍的cocercivity常数,从而增加了一倍的戴维斯和尹建立的间隔的大小。作为副产品,同样的结论适用于前向-后向分裂算法。此外,我们使用的概念,“加强”的集值算子,以获得一个新的分裂算法计算的和的预解式。最后,我们提供了一些数值实验来说明适当选择算法的步长和松弛因子的重要性。

英文摘要:

This note is devoted to the splitting algorithm proposed by Davis and Yin in 2017 for computing a zero of the sum of three maximally monotone operators, with one of them being cocoercive. We provide a direct proof that guarantees its convergence when the stepsizes are smaller than four times the cocoercivity constant, thus doubling the size of the interval established by Davis and Yin. As a by-product, the same conclusion applies to the forward-backward splitting algorithm. Further, we use the notion of "strengthening" of a set-valued operator to derive a new splitting algorithm for computing the resolvent of the sum. Last but not least, we provide some numerical experiments illustrating the importance of appropriately choosing the stepsize and relaxation parameters of the algorithms.

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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