Solving nonnegative sparsity-constrained optimization via DC quadratic-piecewise-linear approximations

Chungen Shen () and Xiao Liu
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Chungen Shen: University of Shanghai for Science and Technology
Xiao Liu: University of Shanghai for Science and Technology

Journal of Global Optimization, 2021, vol. 81, issue 4, No 8, 1019-1055

Abstract: Abstract In this paper, we propose a novel algorithm that is based on quadratic-piecewise-linear approximations of DC functions to solve nonnegative sparsity-constrained optimization. A penalized DC (difference of two convex functions) formulation is proved to be equivalent to the original problem under a suitable penalty parameter. We employ quadratic-piecewise-linear approximations to the two parts of the DC objective function, resulting in a nonconvex subproblem. This is the key ingredient of our main algorithm. This nonconvex subproblem can be solved by a globally convergent alternating variable algorithm. Under some mild conditions, we prove that the proposed main algorithm for the penalized problem is globally convergent. Some preliminary numerical results on the sparse nonnegative least squares and logistic regression problems demonstrate the efficiency of our algorithm.

Keywords: Nonnegative sparsity-constrained optimization; Penalized DC formulation; Piecewise-linear approximations; Global convergence; 90C30 (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s10898-021-01028-9

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