Inexact restoration with subsampled trust-region methods for finite-sum minimization


Convex and nonconvex finite-sum minimization arises in many scientific computing and machine learning applications. Recently, first-order and second-order methods where objective functions, gradients and Hessians are approximated by randomly sampling components of the sum have received great attention. We propose a new trust-region method which employs suitable approximations of the objective function, gradient and Hessian built via random subsampling techniques. The choice of the sample size is deterministic and ruled by the inexact restoration approach. We discuss local and global properties for finding approximate first- and second-order optimal points and function evaluation complexity results. Numerical experience shows that the new procedure is more efficient, in terms of overall computational cost, than the standard trust-region scheme with subsampled Hessians.

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Dedicated with friendship to José Mario Martínez for his outstanding scientific contributions.

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Correspondence to Nataša Krejić.

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S. Bellavia, B. Morini: Members of the INdAM Research Group GNCS.

The work of Bellavia and Morini was supported by Gruppo Nazionale per il Calcolo Scientifico (GNCS-INdAM) of Italy. The work of the second author was supported by Serbian Ministry of Education, Science and Technological Development, Grant No. 451-03-68/2020-14/200125. Part of the research was conducted during a visit of the second author at Dipartimento di Ingegneria Industriale supported by Piano di Internazionalizzazione, Università degli Studi di Firenze.

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Bellavia, S., Krejić, N. & Morini, B. Inexact restoration with subsampled trust-region methods for finite-sum minimization. Comput Optim Appl 76, 701–736 (2020).

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  • Inexact restoration
  • Trust-region methods
  • Subsampling
  • Local and global convergence
  • Worst-case evaluation complexity