/* Copyright (C) 2002 Univ. of Massachusetts Amherst, Computer Science Dept.
This file is part of "MALLET" (MAchine Learning for LanguagE Toolkit).
http://www.cs.umass.edu/~mccallum/mallet
This software is provided under the terms of the Common Public License,
version 1.0, as published by http://www.opensource.org. For further
information, see the file `LICENSE' included with this distribution. */
/**
@author Andrew McCallum <a href="mailto:mccallum@cs.umass.edu">mccallum@cs.umass.edu</a>
*/
package cc.mallet.types.tests;
import cc.mallet.types.Alphabet;
import cc.mallet.types.FeatureSequence;
import cc.mallet.types.Multinomial;
import junit.framework.*;
public class TestMultinomial extends TestCase
{
public TestMultinomial (String name)
{
super (name);
}
public void testMultinomial ()
{
double[] c = new double[] {.2, .3, .1, .4};
Multinomial m = new Multinomial (c);
assertTrue (m.probability (0) == .2);
}
public void testEstimating ()
{
Alphabet dict = new Alphabet ();
Multinomial.Estimator e = new Multinomial.LaplaceEstimator (dict);
FeatureSequence fs = new FeatureSequence (dict);
fs.add (dict.lookupIndex ("a"));
fs.add (dict.lookupIndex ("n"));
fs.add (dict.lookupIndex ("d"));
fs.add (dict.lookupIndex ("r"));
fs.add (dict.lookupIndex ("e"));
fs.add (dict.lookupIndex ("w"));
fs.add (dict.lookupIndex ("m"));
fs.add (dict.lookupIndex ("c"));
fs.add (dict.lookupIndex ("c"));
fs.add (dict.lookupIndex ("a"));
fs.add (dict.lookupIndex ("l"));
fs.add (dict.lookupIndex ("l"));
fs.add (dict.lookupIndex ("u"));
fs.add (dict.lookupIndex ("m"));
//System.out.println (fs.toString());
e.increment (fs);
assertTrue (e.size() == 10);
Multinomial m = e.estimate ();
assertTrue (m.size() == 10);
assertTrue (m.probability (dict.lookupIndex ("a")) == (2.0+1)/(14.0+10));
assertTrue (m.probability ("w") == (1.0+1)/(14.0+10));
Multinomial.Logged ml = new Multinomial.Logged (m);
assertTrue (m.logProbability ("w") == ml.logProbability ("w"));
}
public static Test suite ()
{
return new TestSuite (TestMultinomial.class);
}
protected void setUp ()
{
}
public static void main (String[] args)
{
junit.textui.TestRunner.run (suite());
}
}