A branch-and-price algorithm for the multilevel generalized assignment problem

A branch-and-price algorithm for the multilevel generalized assignment problem

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Article ID: iaor20081471
Country: United States
Volume: 54
Issue: 6
Start Page Number: 1172
End Page Number: 1184
Publication Date: Nov 2006
Journal: Operations Research
Authors: ,
Keywords: programming: integer
Abstract:

The multilevel generalized assignment problem (MGAP) is a variation of the generalized assignment problem, in which agents can execute tasks at different efficiency levels with different costs. We present a branch-and-price algorithm that is the first exact algorithm for the MGAP. It is based on a decomposition into a master problem with set-partitioning constraints and a pricing sub problem that is a multiple-choice knapsack problem. We report on our computational experience with randomly generated instances with different numbers of agents, tasks, and levels; and with different correlations between cost and resource consumption for each agent–task–level assignment. Experimental results show that our algorithm is able to solve instances larger than those of the maximum size considered in the literature to proven optimality.

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