/*
* 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.Instances;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests MergeTwoValues. Run from the command line with:<p>
* java weka.filters.unsupervised.attribute.MergeTwoValuesTest
*
* @author <a href="mailto:len@reeltwo.com">Len Trigg</a>
* @version $Revision: 1.5 $
*/
public class MergeTwoValuesTest extends AbstractFilterTest {
public MergeTwoValuesTest(String name) { super(name); }
/** Creates an example MergeTwoValues */
public Filter getFilter() {
MergeTwoValues f = new MergeTwoValues();
// Ensure the filter we return can run on the test dataset
f.setAttributeIndex("2");
return f;
}
public void testInvalidAttributeTypes() {
Instances icopy = new Instances(m_Instances);
try {
((MergeTwoValues)m_Filter).setAttributeIndex("1");
m_Filter.setInputFormat(icopy);
fail("Should have thrown an exception selecting a STRING attribute!");
} catch (Exception ex) {
// OK
}
try {
((MergeTwoValues)m_Filter).setAttributeIndex("3");
m_Filter.setInputFormat(icopy);
fail("Should have thrown an exception indicating a NUMERIC attribute!");
} catch (Exception ex) {
// OK
}
}
public void testTypical() {
Instances result = useFilter();
// Number of attributes and instances shouldn't change
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// Check that the merging is correct
int mergedIndex = -1;
for (int i = 0; i < result.numInstances(); i++) {
if ((m_Instances.instance(i).value(1) == 0) ||
(m_Instances.instance(i).value(1) == 2)) {
if (mergedIndex == -1) {
mergedIndex = (int)result.instance(i).value(1);
} else {
assertEquals("Checking merged value for instance: " + (i + 1),
mergedIndex, (int)result.instance(i).value(1));
}
}
}
}
public void testFirstValueIndex() {
((MergeTwoValues)m_Filter).setFirstValueIndex("2");
Instances result = useFilter();
// Number of attributes and instances shouldn't change
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// Check that the merging is correct
int mergedIndex = -1;
for (int i = 0; i < result.numInstances(); i++) {
if ((m_Instances.instance(i).value(1) == 1) ||
(m_Instances.instance(i).value(1) == 2)) {
if (mergedIndex == -1) {
mergedIndex = (int)result.instance(i).value(1);
} else {
assertEquals("Checking merged value for instance: " + (i + 1),
mergedIndex, (int)result.instance(i).value(1));
}
}
}
}
public void testSecondValueIndex() {
((MergeTwoValues)m_Filter).setSecondValueIndex("2");
Instances result = useFilter();
// Number of attributes and instances shouldn't change
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// Check that the merging is correct
int mergedIndex = -1;
for (int i = 0; i < result.numInstances(); i++) {
if ((m_Instances.instance(i).value(1) == 0) ||
(m_Instances.instance(i).value(1) == 1)) {
if (mergedIndex == -1) {
mergedIndex = (int)result.instance(i).value(1);
} else {
assertEquals("Checking merged value for instance: " + (i + 1),
mergedIndex, (int)result.instance(i).value(1));
}
}
}
}
public void testAttributeWithMissing() {
((MergeTwoValues)m_Filter).setAttributeIndex("5");
((MergeTwoValues)m_Filter).setFirstValueIndex("1");
((MergeTwoValues)m_Filter).setSecondValueIndex("2");
Instances result = useFilter();
// Number of attributes and instances shouldn't change
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// Check that the merging is correct
int mergedIndex = -1;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i).isMissing(4)) {
assertTrue("Missing in input should give missing in result",
result.instance(i).isMissing(4));
} else if ((m_Instances.instance(i).value(4) == 0) ||
(m_Instances.instance(i).value(4) == 1)) {
if (mergedIndex == -1) {
mergedIndex = (int)result.instance(i).value(4);
} else {
assertEquals("Checking merged value for instance: " + (i + 1),
mergedIndex, (int)result.instance(i).value(4));
}
}
}
}
/**
* tests the filter in conjunction with the FilteredClassifier
*/
public void testFilteredClassifier() {
try {
Instances data = getFilteredClassifierData();
for (int i = 0; i < data.numAttributes(); i++) {
if (data.classIndex() == i)
continue;
if (data.attribute(i).isNominal()) {
((MergeTwoValues) m_FilteredClassifier.getFilter()).setAttributeIndex(
"" + (i + 1));
break;
}
}
}
catch (Exception e) {
fail("Problem setting up test for FilteredClassifier: " + e.toString());
}
super.testFilteredClassifier();
}
public static Test suite() {
return new TestSuite(MergeTwoValuesTest.class);
}
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}