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An Overview on Projection-Type Methods for Convex Large-Scale Quadratic Programs

  • Valeria Ruggiero
  • Luca Zanni
Chapter
  • 427 Downloads
Part of the Nonconvex Optimization and Its Applications book series (NOIA, volume 58)

Abstract

A well-known approach for solving large and sparse linearly constrained quadratic programming (QP) problems is given by the splitting and projection methods. After a survey on these classical methods, we show that they can be unified in a general iterative scheme consisting in to solve a sequence of QP subproblems with the constraints of the original problem and an easily solvable Hessian matrix. A convergence theorem is given for this general scheme. In order to improve the numerical performance of these methods, we introduce two variants of a projection- type scheme that use a variable projection parameter at each step. The two variable projection methods differ in the strategy used to assure a sufficient decrease of the objective function at each iteration. We prove, under very general hypotheses, the convergence of these schemes and we propose two practical, nonexpensive and efficient updating rules for the projection parameter. An extensive numerical experimentation shows the effectiveness of the variable projection-type methods.

Keywords

Convex quadratic programs large-scale problems projection type methods splitting methods 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Valeria Ruggiero
    • 1
  • Luca Zanni
    • 2
  1. 1.Dipartimento di MatematicaUniversità di FerraraFerraraItaly
  2. 2.Dipartimento di MatematicaUniversità di Modena e Reggio EmiliaModenaItaly

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