4 Experimentation with jMetal 31
4.1 The jmetal.experiments.Settings Class . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.2 An example of Setting class: NSGA-II . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.3 The jmetal.experiments.Main class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.4 Experimentation Example: NSGAIIStudy . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.4.1 Defining the experiment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.4.2 Running the experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.4.3 Analyzing the output results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.5 Experimentation example: StandardStudy . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.6 Experiments when the Pareto fronts of the problems are unknown . . . . . . . . . . . . . 49
4.7 Using quality indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4.8 Running experiments in parallel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5 Parallel Algorithms 51
5.1 The IParallelEvaluator Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2 Evaluating Solutions In Parallel in NSGA-II: pNSGAII . . . . . . . . . . . . . . . . . . . . 52
5.3 About Parallel Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6 How-to’s 57
6.1 How to use binary representations in jMetal . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.2 How to use permutation representations in jMetal . . . . . . . . . . . . . . . . . . . . . . 59
6.3 How to use the Mersenne Twister pseudorandom number generator? . . . . . . . . . . . . 60
6.4 How to create a new solution type having mixed variables? . . . . . . . . . . . . . . . . . 60
6.5 How to obtain the non-dominated solutions from a file? . . . . . . . . . . . . . . . . . . . 62
6.6 How to use the WFG Hypervolume algorithm . . . . . . . . . . . . . . . . . . . . . . . . . 63
6.7 How to configure the algorithms from a configuration file? . . . . . . . . . . . . . . . . . . 64
7 What about’s 65
7.1 What about developing single-objective metaheuristics with jMetal? . . . . . . . . . . . . 65
7.2 What about optimized variables and solution types? . . . . . . . . . . . . . . . . . . . . . 65
8 Versions and Release Notes 69
8.1 Version 4.5 (21
st
January 2014) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8.2 Version 4.4 (23
rd
July 2013) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8.3 Version 4.3 (3
rd
January 2013) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8.4 Version 4.2 (14
th
November 2012) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.5 Version 4.0 (10
th
November 2011) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8.6 Version 3.1 (1
st
October 2010) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8.7 Version 3.0 (28
th
February 2010) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8.8 Version 2.2 (28
nd
May 2009) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8.9 Version 2.1 (23
rd
February 2009) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
8.10 Version 2.0 (23
rd
December 2008) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Bibliography 76
iv
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