Computational Optimization and Applications

, Volume 63, Issue 1, pp 97–120 | Cite as

Lagrangian heuristics for the Quadratic Knapsack Problem

  • Jesus Ossian Cunha
  • Luidi Simonetti
  • Abilio Lucena
Article
  • 293 Downloads

Abstract

This paper investigates two Lagrangian heuristics for the Quadratic Knapsack Problem. They originate from distinct linear reformulations of the problem and follow the traditional approach of generating Lagrangian dual bounds and then using their corresponding solutions as an input to a primal heuristic. One Lagrangian heuristic, in particular, is a Non-Delayed Relax-and-Cut algorithm. Accordingly, it differs from the other heuristic in that it dualizes valid inequalities on-the-fly, as they become necessary. The algorithms are computationally compared here with two additional heuristics, taken from the literature. Comparisons being carried out over problem instances up to twice as large as those previously used. Three out of the four algorithms, including the Lagrangian heuristics, are CPU time intensive and typically return very good quality feasible solutions. A certificate of that being given by the equally good Lagrangian dual bounds we generate. Finally, this paper is intended as a contribution towards the investigation of more elaborated heuristics to the problem, an area that has been barely investigated so far.

Keywords

Quadratic Knapsack Problem Lagrangian heuristics Relax-and-Cut Lower and upper bounds 

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Jesus Ossian Cunha
    • 1
  • Luidi Simonetti
    • 2
  • Abilio Lucena
    • 1
  1. 1.COPPE, Universidade Federal do Rio de JaneiroRio de JaneiroBrazil
  2. 2.Instituto de ComputaçãoUniversidade Federal FluminenseNiteroiBrazil

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