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• W2765339558 abstract "Composite optimization models consist of the minimization of the sum of a smooth (not necessarily convex) function and a nonsmooth convex function. Such models arise in many applications where, in addition to the composite nature of the objective function, a hierarchy of models is readily available. It is common to take advantage of this hierarchy of models by first solving a low fidelity model and then using the solution as a starting point to a high fidelity model. We adopt an optimization point of view and show how to take advantage of the availability of a hierarchy of models in a consistent manner. We do not use the low fidelity model just for the computation of promising starting points but also for the computation of search directions. We establish the convergence and convergence rate of the proposed algorithm. Our numerical experiments on large scale image restoration problems and the transition path problem suggest that, for certain classes of problems, the proposed algorithm is significantly faster than the state of the art." @default.
• W2765339558 created "2017-11-10" @default.
• W2765339558 creator A5083174192 @default.
• W2765339558 date "2017-01-01" @default.
• W2765339558 modified "2023-09-26" @default.
• W2765339558 title "A Multilevel Proximal Gradient Algorithm for a Class of Composite Optimization Problems" @default.
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• W2765339558 doi "https://doi.org/10.1137/16m1082299" @default.
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