source: trunk/CrossPare/src/de/ugoe/cs/cpdp/eval/CVWekaEvaluation.java @ 9

package de.ugoe.cs.cpdp.eval;

import java.io.PrintStream;
import java.util.Random;

import org.apache.commons.io.output.NullOutputStream;

import weka.classifiers.Classifier;
import weka.classifiers.Evaluation;
import weka.core.Instances;

/**
 * Implements the {@link AbstractWekaEvaluation} for 10-fold cross validation.
 * @author Steffen Herbold
 */
public class CVWekaEvaluation extends AbstractWekaEvaluation {
        
        /**
         * @see de.ugoe.cs.cpdp.eval.AbstractWekaEvaluation#createEvaluator(weka.core.Instances, weka.classifiers.Classifier)
         */
        @Override
        protected Evaluation createEvaluator(Instances testdata, Classifier classifier) {
                PrintStream errStr      = System.err;
                System.setErr(new PrintStream(new NullOutputStream()));
                try {
                        final Evaluation eval = new Evaluation(testdata);
                        eval.crossValidateModel(classifier, testdata, 10, new Random(1));
                        return eval;
                } catch (Exception e) {
                        throw new RuntimeException(e);
                } finally {
                        System.setErr(errStr);
                }
        }

}