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Zero-norm regularized problems: equivalent surrogates, proximal MM method and statistical error bound

Author

Listed:
  • Dongdong Zhang

    (South China University of Technology)

  • Shaohua Pan

    (South China University of Technology)

  • Shujun Bi

    (South China University of Technology)

  • Defeng Sun

    (The Hong Kong Polytechnic University)

Abstract

For the zero-norm regularized problem, we verify that the penalty problem of its equivalent MPEC reformulation is a global exact penalty, which implies a family of equivalent surrogates. For a subfamily of these surrogates, the critical point set is demonstrated to coincide with the d-directional stationary point set and when a critical point has no too small nonzero component, it is a strongly local optimal solution of the surrogate problem and the zero-norm regularized problem. We also develop a proximal majorization-minimization (MM) method for solving the DC (difference of convex functions) surrogates, and provide its global and linear convergence analysis. For the limit of the generated sequence, the statistical error bound is established under a mild condition, which implies its good quality from a statistical respective. Numerical comparisons with ADMM for solving the DC surrogate and APG for solving its partially smoothed form indicate that our proximal MM method armed with an inexact dual PPA plus the semismooth Newton method (PMMSN for short) is remarkably superior to ADMM and APG in terms of the quality of solutions and the CPU time.

Suggested Citation

  • Dongdong Zhang & Shaohua Pan & Shujun Bi & Defeng Sun, 2023. "Zero-norm regularized problems: equivalent surrogates, proximal MM method and statistical error bound," Computational Optimization and Applications, Springer, vol. 86(2), pages 627-667, November.
    • Handle: RePEc:spr:coopap:v:86:y:2023:i:2:d:10.1007_s10589-023-00496-x
    DOI: 10.1007/s10589-023-00496-x
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    References listed on IDEAS

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