Weka开发［13］－Ensemble

转自 Koala++'s blog  感谢原作者

 

这一篇介绍一下如何使用Ensemble的类，不过提醒一下，不要什么都来个Ensemble，对这种毫无想象力可言的做法，我真是有点无语。

       我已经写了这么多篇了，我也有点累了，这篇也是有人发E-mail让我写的。大家就先自己看吧，至于是不是对的，我以后有机会了我看了，再告诉大家了。

package instanceTest;

import java.io.FileReader;

import weka.classifiers.Classifier;

import weka.classifiers.bayes.NaiveBayes;

import weka.classifiers.functions.LibSVM;

import weka.classifiers.functions.SMO;

import weka.classifiers.meta.AdaBoostM1;

import weka.classifiers.meta.Vote;

import weka.classifiers.trees.J48;

import weka.core.Instances;

import weka.core.SelectedTag;

publicclass EnsembleTest

{

private Instancesm_instances =null;

publicvoid getFileInstances( String fileName )throws Exception

{

FileReader frData = new FileReader( fileName );

m_instances =new Instances( frData );

m_instances.setClassIndex(m_instances.numAttributes() - 1 );

}

publicvoid AdaBoostClassify()throws Exception

{

LibSVM baseClassifier = new LibSVM();

AdaBoostM1 classifier = new AdaBoostM1();

classifier.setClassifier( baseClassifier );

classifier.buildClassifier( m_instances );

System.out.println( classifier.classifyInstance(m_instances.instance( 0 ) ) );

}

publicvoid VoteClassify()throws Exception

{

Classifier baseClassifiers[] = new Classifier[3];

baseClassifiers[0] = new J48();

baseClassifiers[1] = new NaiveBayes();

baseClassifiers[2] = new SMO();

Vote classifier = new Vote();

SelectedTag tag = new SelectedTag(Vote.MAJORITY_VOTING_RULE,Vote.TAGS_RULES);

classifier.setCombinationRule( tag );

classifier.setClassifiers( baseClassifiers );

classifier.buildClassifier( m_instances );

System.out.println( classifier.classifyInstance(m_instances.instance( 0 ) ) );

}

publicstaticvoid main( String[] args )throws Exception

{

EnsembleTest etest = new EnsembleTest();

etest.getFileInstances( "F://Program Files//Weka-3-6//data//contact-lenses.arff");

etest.AdaBoostClassify();

etest.VoteClassify();

}

}