/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Copyright (C) 2002 University of Waikato
*/
package weka.filters.unsupervised.instance;
import weka.core.Instances;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests Resample. Run from the command line with:<p>
* java weka.filters.unsupervised.instance.ResampleTest
*
* @author <a href="mailto:len@reeltwo.com">Len Trigg</a>
* @version $Revision: 1.3 $
*/
public class ResampleTest extends AbstractFilterTest {
public ResampleTest(String name) { super(name); }
/** Creates a default Resample */
public Filter getFilter() {
Resample f = new Resample();
f.setSampleSizePercent(50);
return f;
}
public void testSampleSizePercent() {
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals("Expecting output to be 50% of input",
m_Instances.numInstances() / 2, result.numInstances());
((Resample)m_Filter).setSampleSizePercent(200);
result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals("Expecting output to be 200% of input",
m_Instances.numInstances() * 2, result.numInstances());
}
public void testSampleSizePercentNoReplacement() {
((Resample) m_Filter).setSampleSizePercent(20);
((Resample) m_Filter).setNoReplacement(true);
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals("Expecting output to be 20% of input",
(int) (m_Instances.numInstances() * 20.0 / 100), result.numInstances());
}
public void testSampleSizePercentNoReplacementInverted() {
((Resample) m_Filter).setSampleSizePercent(20);
((Resample) m_Filter).setNoReplacement(true);
((Resample) m_Filter).setInvertSelection(true);
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals("Expecting output to be 80% of input (20% inverted)",
m_Instances.numInstances()
- (int) (m_Instances.numInstances() * 20.0 / 100), result.numInstances());
}
public static Test suite() {
return new TestSuite(ResampleTest.class);
}
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}