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Relaxed inertial proximal Peaceman-Rachford splitting method for separable convex programming |
Yongguang HE1, Huiyun LI2, Xinwei LIU1() |
1. Institute of Mathematics, Hebei University of Technology, Tianjin 300401, China 2. School of Control Science and Engineering, Hebei University of Technology, Tianjin 300401, China |
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Abstract The strictly contractive Peaceman-Rachford splitting method is one of effective methods for solving separable convex optimization problem, and the inertial proximal Peaceman-Rachford splitting method is one of its important variants. It is known that the convergence of the inertial proximal Peaceman-Rachford splitting method can be ensured if the relaxation factor in Lagrangian multiplier updates is underdetermined, which means that the steps for the Lagrangian multiplier updates are shrunk conservatively. Although small steps play an important role in ensuring convergence, they should be strongly avoided in practice. In this article, we propose a relaxed inertial proximal Peaceman-Rachford splitting method, which has a larger feasible set for the relaxation factor. Thus, our method provides the possibility to admit larger steps in the Lagrangian multiplier updates. We establish the global convergence of the proposed algorithm under the same conditions as the inertial proximal Peaceman-Rachford splitting method. Numerical experimental results on a sparse signal recovery problem in compressive sensing and a total variation based image denoising problem demonstrate the effectiveness of our method.
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Keywords
Convex programming
inertial proximal Peaceman-Rachford splitting method
relaxation factor
global convergence
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Corresponding Author(s):
Xinwei LIU
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Issue Date: 11 June 2018
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