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A geometric proximal gradient method for sparse least squares regression with probabilistic simplex constraint. (English) Zbl 1492.65165

Summary: In this paper, we consider the sparse least squares regression problem with probabilistic simplex constraint. Due to the probabilistic simplex constraint, one could not apply directly the \(\ell_1\)-regularization to the considered regression model. To find a sparse solution, we reformulate the sparse least squares regression problem as a nonconvex and nonsmooth \(\ell_1\)-regularized minimization problem over the unit sphere. Then we propose a geometric proximal gradient method for solving the regularized problem with a varied regularized parameter, where the explicit expression of the global solution to every involved subproblem is obtained. The global convergence of the proposed method is established under some mild assumptions. Some numerical results are reported to illustrate the effectiveness of the proposed algorithm.

MSC:

65K05 Numerical mathematical programming methods
90C25 Convex programming
90C26 Nonconvex programming, global optimization

References:

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