Papers › Primal-dual extragradient methods for nonlinear nonsmooth PDE-constrained optimization
Primal-dual extragradient methods for nonlinear nonsmooth PDE-constrained optimization
Christian Clason, Tuomo Valkonen
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We study the extension of the Chambolle--Pock primal-dual algorithm to nonsmooth optimization problems involving nonlinear operators between function spaces. Local convergence is shown under technical conditions including metric regularity of the corresponding primal-dual optimality conditions. We also show convergence for a Nesterov-type accelerated variant provided one part of the functional is strongly convex. We show the applicability of the accelerated algorithm to examples of inverse problems with L¹- and L^∞-fitting terms as well as of state-constrained optimal control problems, where convergence can be guaranteed after introducing an (arbitrary small, still nonsmooth) Moreau--Yosida regularization. This is verified in numerical examples.
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