Abstract
Alternating direction method of multipliers is a powerful first-order method for non-smooth optimization problems including various applications in inverse problems and imaging. However, there is no clear result on the weak convergence of alternating direction method of multipliers in infinite-dimensional Hilbert spaces with relaxation. In this paper, by employing a kind of partial gap analysis, we prove the weak convergence of a general preconditioned and relaxed version in infinite-dimensional Hilbert spaces, with preconditioning for solving all the involved implicit equations under mild conditions. We also give the corresponding ergodic convergence rates respecting to the partial gap function. Furthermore, the connections between certain preconditioned and relaxed alternating direction method of multipliers and the corresponding Douglas–Rachford splitting methods are discussed. Numerical tests show the efficiency of the proposed overrelaxation variants with preconditioning.
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Acknowledgements
The author is very grateful to Kristian Bredies, who suggested numerous improvements during preparing the draft of this article. He also acknowledges the support of NSF of China under grant No. 11701563 and the Fundamental Research Funds for the Central Universities, and the research funds of Renmin University of China (15XNLF20). He also acknowledges the support of Alexander von Humboldt Foundation.
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Communicated by Roland Glowinski.
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Sun, H. Analysis of Fully Preconditioned Alternating Direction Method of Multipliers with Relaxation in Hilbert Spaces. J Optim Theory Appl 183, 199–229 (2019). https://doi.org/10.1007/s10957-019-01535-6
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DOI: https://doi.org/10.1007/s10957-019-01535-6
Keywords
- Alternating direction method of multipliers
- Relaxation
- Linear preconditioners technique
- Weak convergence analysis
- Douglas–Rachford splitting
- Image reconstruction