Abstract
In this paper, first, we review the projection and contraction methods for solving the split feasibility problem (SFP), and then by using the inverse strongly monotone property of the underlying operator of the SFP, we improve the “optimal” step length to provide the modified projection and contraction methods. Also, we consider the corresponding relaxed variants for the modified projection and contraction methods, where the two closed convex sets are both level sets of convex functions. Some convergence theorems of the proposed methods are established under suitable conditions. Finally, we give some numerical examples to illustrate that the modified projection and contraction methods have an advantage over other methods, and improve greatly the projection and contraction methods.
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Acknowledgements
We wish to thank anonymous referees and an associate editor for the thorough analysis and review. Their comments and suggestions helped tremendously in improving the quality of this paper.
The first author is supported by National Natural Science Foundation of China (No. 71602144) and Open Fund of Tianjin Key Lab for Advanced Signal Processing (No. 2016ASP-TJ01) and the second author is supported by Visiting Scholarship of Academy of Mathematics and Systems Science, Chinese Academy of Sciences (AM201622C04), the National Natural Science Foundations of China (11401293, 11661056), the Natural Science Foundations of Jiangxi Province (20151BAB211010). The third author was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and future Planning (2014R1A2A2A01002100).
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Dong, Q.L., Tang, Y.C., Cho, Y.J. et al. “Optimal” choice of the step length of the projection and contraction methods for solving the split feasibility problem. J Glob Optim 71, 341–360 (2018). https://doi.org/10.1007/s10898-018-0628-z
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DOI: https://doi.org/10.1007/s10898-018-0628-z
Keywords
- Split feasibility problem
- CQ method
- Projection and contraction method
- Modified projection and contraction method
- Inverse strongly monotone