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On the linear convergence of the general first order primal-dual algorithm

The research of the first author was supported by National Natural Science Foundation of China (NSFC) at Grant No. 11901294 and Natural Science Foundation of Jiangsu Province at Grant No. BK20190429. The research of the second author was supported by National Natural Science Foundation of China (NSFC) at Grants No. 11625105 and No. 11926358

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  • In this paper, we consider the general first order primal-dual algorithm, which covers several recent popular algorithms such as the one proposed in [Chambolle, A. and Pock T., A first-order primal-dual algorithm for convex problems with applications to imaging, J. Math. Imaging Vis., 40 (2011) 120-145] as a special case. Under suitable conditions, we prove its global convergence and analyze its linear rate of convergence. As compared to the results in the literature, we derive the corresponding results for the general case and under weaker conditions. Furthermore, the global linear rate of the linearized primal-dual algorithm is established in the same analytical framework.

    Mathematics Subject Classification: Primary: 90C47, 90C33; Secondary: 65K05.


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  • Figure 1.  From left to right: the original images, the degraded images and the restored images by Algorithm 1

    Figure 2.  Evolution of SNRs, and Relative error (Rer) defined by (22) with respect to iterations. Left: for House. Right: for Lena

    Figure 3.  Sensitivity analysis on parameters $ \tau $ of Algorithm 1 for matrix correlation problems

    Table 1.  Parameters Setting

    Parameters Values
    $ (1/r,1/s,\tau) $ $ (0.05, 3, -0.2) $
    $ (1/r,1/s,\tau) $ $ (0.01, 15, 0) $
    $ (1/r,1/s,\tau) $ $ (0.012, 12.5, 0.4) $
    $ (1/r,1/s,\tau) $ $ (0.012, 12.5, 0.8) $
    $ (1/r,1/s,\tau) $ $ (0.01, 12.5, 1) $
    $ (1/r,1/s,\tau) $ $ (0.012, 12.5, 1.2) $
     | Show Table
    DownLoad: CSV
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