/*
* 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.attribute;
import weka.core.Attribute;
import weka.core.Instances;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests Discretize. Run from the command line with:<p>
* java weka.filters.unsupervised.attribute.DiscretizeTest
*
* @author <a href="mailto:len@reeltwo.com">Len Trigg</a>
* @version $Revision: 1.3 $
*/
public class DiscretizeTest extends AbstractFilterTest {
public DiscretizeTest(String name) { super(name); }
/** Creates a default Discretize */
public Filter getFilter() {
Discretize f= new Discretize();
return f;
}
/** Creates a specialized Discretize */
public Filter getFilter(String rangelist) {
try {
Discretize f = new Discretize();
f.setAttributeIndices(rangelist);
return f;
} catch (Exception ex) {
ex.printStackTrace();
fail("Exception setting attribute range: " + rangelist
+ "\n" + ex.getMessage());
}
return null;
}
public void testTypical() {
m_Filter = getFilter("1,2");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
// None of the attributes should have changed, since 1,2 aren't numeric
for (int i = 0; i < result.numAttributes(); i++) {
assertEquals(m_Instances.attribute(i).type(), result.attribute(i).type());
assertEquals(m_Instances.attribute(i).name(), result.attribute(i).name());
}
}
public void testTypical2() {
m_Filter = getFilter("3-4");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
for (int i = 0; i < result.numAttributes(); i++) {
if (i != 2) {
assertEquals(m_Instances.attribute(i).type(), result.attribute(i).type());
assertEquals(m_Instances.attribute(i).name(), result.attribute(i).name());
} else {
assertEquals(Attribute.NOMINAL, result.attribute(i).type());
assertEquals(10, result.attribute(i).numValues());
}
}
}
public void testInverted() {
m_Filter = getFilter("1,2");
((Discretize)m_Filter).setInvertSelection(true);
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
for (int i = 0; i < result.numAttributes(); i++) {
if ((i < 2) || !m_Instances.attribute(i).isNumeric()) {
assertEquals(m_Instances.attribute(i).type(), result.attribute(i).type());
assertEquals(m_Instances.attribute(i).name(), result.attribute(i).name());
} else {
assertEquals(Attribute.NOMINAL, result.attribute(i).type());
assertEquals(10, result.attribute(i).numValues());
}
}
}
public void testNonInverted2() {
m_Filter = getFilter("first-3");
((Discretize)m_Filter).setInvertSelection(true);
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
for (int i = 0; i < result.numAttributes(); i++) {
if ((i < 3) || !m_Instances.attribute(i).isNumeric()) {
assertEquals(m_Instances.attribute(i).type(), result.attribute(i).type());
assertEquals(m_Instances.attribute(i).name(), result.attribute(i).name());
} else {
assertEquals(Attribute.NOMINAL, result.attribute(i).type());
assertEquals(10, result.attribute(i).numValues());
}
}
}
public void testBins() {
m_Filter = getFilter("3");
((Discretize)m_Filter).setBins(5);
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(Attribute.NOMINAL, result.attribute(2).type());
assertEquals(5, result.attribute(2).numValues());
((Discretize)m_Filter).setBins(20);
result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(Attribute.NOMINAL, result.attribute(2).type());
assertEquals(20, result.attribute(2).numValues());
}
public void testFindNumBins() {
m_Filter = getFilter("3");
((Discretize)m_Filter).setFindNumBins(true);
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(Attribute.NOMINAL, result.attribute(2).type());
assertTrue(5 >= result.attribute(2).numValues());
}
public static Test suite() {
return new TestSuite(DiscretizeTest.class);
}
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}