Abstract
Connectedness of efficient solutions is a powerful property in multiple objective combinatorial optimization since it allows the construction of the complete efficient set using neighborhood search techniques. However, we show that many classical multiple objective combinatorial optimization problems do not possess the connectedness property in general, including, among others, knapsack problems (and even several special cases) and linear assignment problems. We also extend known non-connectedness results for several optimization problems on graphs like shortest path, spanning tree and minimum cost flow problems. Different concepts of connectedness are discussed in a formal setting, and numerical tests are performed for two variants of the knapsack problem to analyze the likelihood with which non-connected adjacency graphs occur in randomly generated instances.
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Ehrgott, M., Gandibleux, X.: A survey and annotated bibliography of multiobjective combinatorial optimization. OR Spektrum 22, 425–460 (2000)
Isermann, H.: The enumeration of the set of all efficient solutions for a linear multiple objective program. Oper. Res. Q. 28, 711–725 (1977)
Naccache, P.: Connectedness of the set of nondominated outcomes. J. Optim. Theory Appl. 25, 459–467 (1978)
Helbig, S.: On the connectedness of the set of weakly efficient points of a vector optimization problem in locally convex spaces. J. Optim. Theory Appl. 65, 257–271 (1990)
Martins, E.Q.V.: On a multicriteria shortest path problem. Eur. J. Oper. Res. 16, 236–245 (1984)
Ehrgott, M., Klamroth, K.: Connectedness of efficient solutions in multiple criteria combinatorial optimization. Eur. J. Oper. Res. 97, 159–166 (1997)
Przybylski, A., Gandibleux, X., Ehrgott, M.: The biobjective integer minimum cost flow problem—incorrectness of Sedeño-Noda and González-Martín’s algorithm. Comput. Oper. Res. 33, 1459–1463 (2006)
Sedeño-Noda, A., González-Martín, C.: An algorithm for the biobjective integer minimum cost flow problem. Comput. Oper. Res. 28, 139–156 (2001)
Pedersen, C.R.: Multicriteria discrete optimization—and related topics. Ph.D. Thesis, University of Aarhus, Denmark (2006)
da Silva, C.G., Clímaco, J., Figueira, J.: Geometrical configuration of the Pareto frontier of bi-criteria {0,1}-knapsack problems. Working paper 16-2004, Institute for Systems and Computers Engineering, Coimbra, Portugal (2004)
Gorski, J.: Multiple Objective Optimization and Implications for Single Objective Optimization. Shaker Verlag, Aachen (2010)
O’Sullivan, M., Walker, C.: Connecting efficient knapsacks—experiments with the equally-weighted bi-criteria knapsack problem. In: 39th Annual ORSNZ Conference, University of Auckland, Auckland, New Zealand, pp. 198–207 (2004)
Liefooghe, A., Paquete, L., Simões, M., Figueira, J.R.: Connectedness and local search for bicriteria knapsack problems. In: 11th European Conference on Evolutionary Computation in Combinatorial Optimisation. LNCS. Springer, Berlin (2011)
Paquete, L., Chiarandini, M., Stützle, T.: Pareto local optimum sets in the biobjective traveling salesman problem: An experimental study. In: Gandibleux, X., Sevaux, M., Srensen, K., T’kindt, V. (eds.) Metaheuristics for Multiobjective Optimisation. Lecture Notes in Economics and Mathematical Systems, vol. 535. Springer, Berlin (2004)
Paquete, L., Stützle, T.: Clusters of nondominated solutions in multiobjective combinatorial optimization. In: 7th International Conference on Multi-Objective Programming and Goal Programming, Tours, France (2006)
Steuer, R.: Multiple Criteria Optimization. Theory, Computation, and Application. Wiley, New York (1985)
Ehrgott, M.: Multicriteria Optimization. Springer, Berlin (2005)
Gorski, J.: Analysis of the connectedness of Pareto-optimal solutions in multiple criteria combinatorial optimization. M.S. Thesis, University of Erlangen-Nuremberg, Germany (2004)
Geist, D., Rodin, E.Y.: Adjacency of the 0-1 knapsack problem. Comput. Oper. Res. 19(8), 797–800 (1992)
Balinski, M.L., Russakoff, A.: On the assignment polytope. SIAM Rev. 16, 516–525 (1974)
Hausmann, D.: Adjacency on Polytopes in Combinatorial Optimization. Verlag Anton Hain, Königstein/Ts (1980)
Klamroth, K., Wiecek, M.: Dynamic programming approaches to the multiple criteria knapsack problem. Nav. Res. Logist. 47(1), 57–76 (2000)
Bazgan, C., Hugot, H., Vanderpooten, D.: Solving efficiently the 0-1 multi-objective knapsack problem. Comput. Oper. Res. 36(1), 260–279 (2009)
Pedersen, C.R., Nielsen, L.R., Andersen, K.A.: On the bicriterion multi modal assignment problem. Working paper WP-2005-3, Department of Operations Research, University of Aarhus (2005)
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Communicated by H. Benson.
The work of the three authors was supported by the project “Connectedness and Local Search for Multi-objective Combinatorial Optimization” founded by the Deutscher Akademischer Austausch Dienst and Conselho de Reitores das Universidades Portuguesas. In addition, the research of Stefan Ruzika was partially supported by Deutsche Forschungsgemeinschaft (DFG) grant HA 1737/7 “Algorithmik großer und komplexer Netzwerke”.
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Gorski, J., Klamroth, K. & Ruzika, S. Connectedness of Efficient Solutions in Multiple Objective Combinatorial Optimization. J Optim Theory Appl 150, 475–497 (2011). https://doi.org/10.1007/s10957-011-9849-8
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DOI: https://doi.org/10.1007/s10957-011-9849-8