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@article{1742276, author = {Mazurenko, Stanislav and Jauhiainen, Jyrki and Valkonen, Tuomo}, article_location = {Kent}, article_number = {2020}, doi = {http://dx.doi.org/10.1553/etna_vol52s509}, keywords = {primal-dual algorithms; convex optimization; non-smooth optimization; step length}, language = {eng}, issn = {1068-9613}, journal = {Electronic Transactions on Numerical Analysis}, title = {Primal-dual block-proximal splitting for a class of non-convex problems}, url = {https://epub.oeaw.ac.at/?arp=0x003bd91d}, volume = {52}, year = {2020} }
TY - JOUR ID - 1742276 AU - Mazurenko, Stanislav - Jauhiainen, Jyrki - Valkonen, Tuomo PY - 2020 TI - Primal-dual block-proximal splitting for a class of non-convex problems JF - Electronic Transactions on Numerical Analysis VL - 52 IS - 2020 SP - 509-552 EP - 509-552 PB - Kent State University SN - 10689613 KW - primal-dual algorithms KW - convex optimization KW - non-smooth optimization KW - step length UR - https://epub.oeaw.ac.at/?arp=0x003bd91d L2 - https://epub.oeaw.ac.at/?arp=0x003bd91d N2 - We develop block structure-adapted primal-dual algorithms for non-convex non-smooth optimisation problems, whose objectives can be written as compositions G(x) + F(K(x)) of non-smooth block-separable convex functions G and F with a nonlinear Lipschitz-differentiable operator K. Our methods are refinements of the nonlinear primal-dual proximal splitting method for such problems without the block structure, which itself is based on the primal-dual proximal splitting method of Chambolle and Pock for convex problems. We propose individual step length parameters and acceleration rules for each of the primal and dual blocks of the problem. This allows them to convergence faster by adapting to the structure of the problem. For the squared distance of the iterates to a critical point, we show local O(1/N), O(1/N-2), and linear rates under varying conditions and choices of the step length parameters. Finally, we demonstrate the performance of the methods for the practical inverse problems of diffusion tensor imaging and electrical impedance tomography. ER -
MAZURENKO, Stanislav, Jyrki JAUHIAINEN a Tuomo VALKONEN. Primal-dual block-proximal splitting for a class of non-convex problems. \textit{Electronic Transactions on Numerical Analysis}. Kent: Kent State University, 2020, roč.~52, č.~2020, s.~509-552. ISSN~1068-9613. Dostupné z: https://dx.doi.org/10.1553/etna\_{}vol52s509.
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