By Carlos Coello Coello, Vincenzo Cutello, Kalyanmoy Deb, Stephanie Forrest, Giuseppe Nicosia, Mario Pavone
The quantity set LNCS 7491 and 7492 constitutes the refereed lawsuits of the twelfth foreign convention on Parallel challenge fixing from Nature, PPSN 2012, held in Taormina, Sicily, Italy, in September 2012. the complete of one zero five revised complete papers have been rigorously reviewed and chosen from 226 submissions. The assembly begun with 6 workshops which provided an incredible chance to discover particular subject matters in evolutionary computation, bio-inspired computing and metaheuristics. PPSN 2012 additionally incorporated eight tutorials. The papers are prepared in topical sections on evolutionary computation; computer studying, classifier platforms, picture processing; experimental research, encoding, EDA, GP; multiobjective optimization; swarm intelligence, collective habit, coevolution and robotics; memetic algorithms, hybridized recommendations, meta and hyperheuristics; and applications.
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Extra info for Parallel Problem Solving from Nature - PPSN XII: 12th International Conference, Taormina, Italy, September 1-5, 2012, Proceedings, Part II
Example text
This can be most easily understood using the examples of the within-cluster sum of squares and the maximum diameter criterion. The within-cluster sum of squares is calculated as the sum of the distances of all data items to their cluster centre. A change in the cluster assignment of any single data item will therefore usually result in a change to the value of the criterion. In contrast, the maximum diameter of a partitioning is defined as the 36 J. Handl and J. Knowles largest dissimilarity observed between data items that reside in the same cluster.
The experimental results have shown that both approaches enable MOEA/D to generate a set of solutions closer to the known Pareto optimal front in fewer iterations than a traditional random initialisation. Solving a graph-based approximation has been shown to produce routes closer to the known Pareto optimal front for the five route planning problems but is only feasible for small graphs because the number of evaluations required increases exponentially. Using a memory-based approach has also been shown to generate routes closer to the known Pareto optimal front for a sequence of problem instances but this is highly dependent on whether a sufficiently similar problem has been solved previously and whether the environment has evolved since solving that problem.
Multi Objective Evolutionary Algorithms Based on Decomposition (MOEA/D)[14] was selected to represent the current state of the art MOEA. Speed-constrained Multi-objective PSO (SMPSO)[15] is used to provide a baseline algorithm from the Particle Swarm Optimisation (PSO) community, while the Non-dominated Sorting Genetic Algorithm II (NSGAII)[16] is also tested as a commonly used effective benchmark MOEA. net/ 14 A. W. Corne which were limited to 200,000 evaluations per run. NSGAII and SMPSO had a population size of 100 and MOEA/D a population size of 600.