/*
* 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) 2007 University of Waikato, Hamilton, New Zealand
*/
package weka.filters.unsupervised.attribute;
import weka.classifiers.meta.FilteredClassifier;
import weka.classifiers.rules.ZeroR;
import weka.core.Attribute;
import weka.core.Instances;
import weka.core.TestInstances;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests NominalToString. Run from the command line with: <p/>
* java weka.filters.unsupervised.attribute.NominalToStringTest
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 1.2 $
*/
public class NominalToStringTest
extends AbstractFilterTest {
public NominalToStringTest(String name) {
super(name);
}
/** Creates an example NominalToString */
public Filter getFilter() {
NominalToString f = new NominalToString();
f.setAttributeIndexes("2");
return f;
}
/**
* returns the configured FilteredClassifier. Since the base classifier is
* determined heuristically, derived tests might need to adjust it.
*
* @return the configured FilteredClassifier
*/
protected FilteredClassifier getFilteredClassifier() {
FilteredClassifier result;
result = super.getFilteredClassifier();
((NominalToString) result.getFilter()).setAttributeIndexes("1");
result.setClassifier(new ZeroR());
return result;
}
/**
* returns data generated for the FilteredClassifier test
*
* @return the dataset for the FilteredClassifier
* @throws Exception if generation of data fails
*/
protected Instances getFilteredClassifierData() throws Exception{
TestInstances test;
Instances result;
test = TestInstances.forCapabilities(m_FilteredClassifier.getCapabilities());
test.setNumRelational(0);
test.setClassIndex(TestInstances.CLASS_IS_LAST);
result = test.generate();
return result;
}
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());
assertEquals("Attribute type should now be STRING",
Attribute.STRING, result.attribute(1).type());
assertEquals(3, result.attribute(1).numValues());
}
public void testMissing() {
((NominalToString)m_Filter).setAttributeIndexes("5");
Instances result = useFilter();
// Number of attributes and instances shouldn't change
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
assertEquals("Attribute type should now be STRING",
Attribute.STRING, result.attribute(4).type());
assertEquals(4, result.attribute(4).numValues());
for (int i = 0; i < result.numInstances(); i++) {
assertTrue("Missing values should be preserved",
m_Instances.instance(i).isMissing(4) ==
result.instance(i).isMissing(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()) {
((NominalToString) m_FilteredClassifier.getFilter()).setAttributeIndexes(
"" + (i + 1));
break;
}
}
}
catch (Exception e) {
fail("Problem setting up test for FilteredClassifier: " + e.toString());
}
super.testFilteredClassifier();
}
public static Test suite() {
return new TestSuite(NominalToStringTest.class);
}
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}