Solving large p-median problems by a multistage hybrid approach using demand points aggregation and variable neighbourhood search

Chandra Ade Irawan, Said Salhi

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Abstract

A hybridisation of a clustering-based technique and of a variable neighbourhood search (VNS) is designed to solve large-scale p-median problems. The approach is based on a multi-stage methodology where learning from previous stages is taken into account when tackling the next stage. Each stage is made up of several subproblems that are solved by a fast procedure to produce good feasible solutions. Within each stage, the solutions returned are put together to make up a new promising subset of potential facilities. This augmented p-median problem is then solved by VNS. As these problems used aggregation, a cost evaluation based on the original demand points instead of aggregation is computed for each of the ‘aggregation’-based solution. The one yielding the least cost is then selected and its chosen facilities included into the next stages. This multi-stage process is repeated several times until a certain criterion is met. This approach is enhanced by an efficient way to aggregate the data and a neighbourhood reduction scheme when allocating demand points to their nearest facilities. The proposed approach is tested, using various values of p, on the largest data sets from the literature with up to 89,600 demand points with encouraging results.
Original languageEnglish
Pages (from-to)537–554
JournalJournal of Global Optimization
Volume63
Issue number3
Early online date12 Jun 2013
DOIs
Publication statusPublished - 2015

Keywords

  • Variable neighbourhood search
  • Location problem
  • Aggregation
  • p-median
  • WNU

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