場(chǎng)景：從樣本集中采樣80%用于訓(xùn)練，20%用于驗(yàn)證。

參考代碼如下：

package com.gddx;import java.io.File; import java.util.Map;import libsvm.LibSVM; import net.sf.javaml.classification.Classifier; import net.sf.javaml.classification.evaluation.EvaluateDataset; import net.sf.javaml.classification.evaluation.PerformanceMeasure; import net.sf.javaml.core.Dataset; import net.sf.javaml.sampling.Sampling; import net.sf.javaml.tools.data.FileHandler; import be.abeel.util.Pair;/*** Sample program illustrating how to use sampling.* * @author Thomas Abeel* */ public class TutorialSampling {public static void main(String[] args) throws Exception {Dataset data = FileHandler.loadDataset(new File("D:\\tmp\\javaml-0.1.7-src\\UCI-small\\iris\\iris.data"), 4, ",");Sampling s = Sampling.SubSampling;Pair<Dataset, Dataset> datass = s.sample(data, (int) (data.size() * 0.8));System.out.println(datass.x().instance(0));//訓(xùn)練集System.out.println(datass.y().instance(0));//測(cè)試集Classifier c = new LibSVM();c.buildClassifier(datass.x());Map<Object,PerformanceMeasure> pms = EvaluateDataset.testDataset(c, datass.y());System.out.println(pms);/*for (int i = 0; i < 5; i++) {Pair<Dataset, Dataset> datas = s.sample(data, (int) (data.size() * 0.8), i);Classifier c = new LibSVM();c.buildClassifier(datas.x());Map<Object,PerformanceMeasure> pms = EvaluateDataset.testDataset(c, datas.y());System.out.println(pms);}*/} }

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