weka之Evaluation类

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参考文献:
http://download.csdn.net/detail/kaikai_sk/9854749

package EvaluationTest;import java.io.FileNotFoundException;import java.io.FileReader;import java.util.Random;import weka.classifiers.Evaluation;import weka.classifiers.trees.J48;import weka.core.Instances;public class EvaluationTest {    private Instances m_instances=null;    public void getFileInstances(String fileName) throws Exception    {        FileReader frData=new FileReader(fileName);        m_instances=new Instances(frData);        m_instances.setClassIndex(m_instances.numAttributes()-1);    }    public void crossValidation() throws Exception    {        J48 classifier=new J48();        Evaluation eval=new Evaluation(m_instances);        eval.crossValidateModel(classifier, m_instances, 10, new Random(1));        System.out.println(eval.toClassDetailsString());        System.out.println(eval.toSummaryString());        System.out.println(eval.toMatrixString());    }    public void evalueateTestData() throws Exception    {        J48 classifier=new J48();        classifier.buildClassifier(m_instances);        Evaluation eval=new Evaluation(m_instances);        eval.evaluateModel(classifier, m_instances);        System.out.println(eval.toClassDetailsString());        System.out.println(eval.toSummaryString());        System.out.println(eval.toMatrixString());    }    public static void main(String[] args) throws Exception     {        EvaluationTest eTest=new EvaluationTest();        eTest.getFileInstances("E:\\Program Files\\Weka-3-8\\data\\weather.nominal.arff");        eTest.crossValidation();        System.out.println("************************************");        eTest.evalueateTestData();    }}

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