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A second-order method for strongly convex \(\ell _1\)-regularization problems


In this paper a robust second-order method is developed for the solution of strongly convex \(\ell _1\)-regularized problems. The main aim is to make the proposed method as inexpensive as possible, while even difficult problems can be efficiently solved. The proposed approach is a primal-dual Newton conjugate gradients (pdNCG) method. Convergence properties of pdNCG are studied and worst-case iteration complexity is established. Numerical results are presented on synthetic sparse least-squares problems and real world machine learning problems.

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Correspondence to Kimon Fountoulakis.

Additional information

J. Gondzio is supported by EPSRC Grant EP/I017127/1.

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Fountoulakis, K., Gondzio, J. A second-order method for strongly convex \(\ell _1\)-regularization problems. Math. Program. 156, 189–219 (2016).

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  • \(\ell _1\)-Regularization
  • Strongly convex optimization
  • Second-order methods
  • Iteration complexity
  • Newton conjugate-gradients method

Mathematics Subject Classification

  • 68W40
  • 65K05
  • 90C06
  • 90C25
  • 90C30
  • 90C51