Last change
on this file since 235 was
193,
checked in by Maciej Komosinski, 11 years ago
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Set svn:eol-style native for all textual files
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Property svn:eol-style set to
native
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File size:
1.0 KB
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Rev | Line | |
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[44] | 1 | package cecj.sampling; |
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| 2 | |
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| 3 | import java.util.ArrayList; |
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| 4 | import java.util.List; |
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| 5 | |
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| 6 | import ec.EvolutionState; |
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| 7 | import ec.Individual; |
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| 8 | import ec.util.Parameter; |
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| 9 | |
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| 10 | /** |
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| 11 | * A random sampling method samples randomly with repetitions given individuals collection. It can |
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| 12 | * be used for so called "k-random opponents" evaluation scheme. |
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| 13 | * |
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| 14 | * @author Marcin Szubert |
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| 15 | * |
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| 16 | */ |
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| 17 | public class RandomSamplingMethod extends SamplingMethod { |
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| 18 | |
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| 19 | private static final String P_SAMPLE_SIZE = "sample-size"; |
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| 20 | |
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| 21 | private int sampleSize; |
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| 22 | |
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| 23 | public void setup(EvolutionState state, Parameter base) { |
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| 24 | Parameter sampleSizeParameter = base.push(P_SAMPLE_SIZE); |
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| 25 | sampleSize = state.parameters.getIntWithDefault(sampleSizeParameter, null, 1); |
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| 26 | } |
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| 27 | |
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| 28 | @Override |
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| 29 | public List<Individual> sample(EvolutionState state, List<Individual> source) { |
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| 30 | List<Individual> result = new ArrayList<Individual>(sampleSize); |
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| 31 | if (!source.isEmpty()) { |
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| 32 | for (int i = 0; i < sampleSize; i++) { |
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| 33 | result.add(source.get(state.random[0].nextInt(source.size()))); |
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| 34 | } |
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| 35 | } |
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| 36 | |
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| 37 | return result; |
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| 38 | } |
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| 39 | } |
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