Experiments with LAGRASP heuristic for set k-covering

نویسندگان

  • Luciana S. Pessoa
  • Mauricio G. C. Resende
  • Celso C. Ribeiro
چکیده

The set k-covering problem is a variant of the classical set covering problem, in which each object is required to be covered at least k times. We describe a hybrid Lagrangean heuristic, named LAGRASP, which combines subgradient optimization and GRASP with path-relinking to solve the set kcovering problem. Computational experiments carried out on 135 test instances show experimentally that by properly tuning the parameters of LAGRASP, it is possible to obtain a good trade-off between solution quality and running times. Furthermore, LAGRASP makes better use of the dual information provided by subgradient optimization and is able to discover better solutions and to escape from locally optimal solutions even after the stabilization of the lower bounds, whereas other strategies fail to find new improving solutions.

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عنوان ژورنال:
  • Optimization Letters

دوره 5  شماره 

صفحات  -

تاریخ انتشار 2011