/* Copyright (C) 2006 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. */
package cc.mallet.grmm.test;
import cc.mallet.grmm.types.*;
import cc.mallet.types.MatrixOps;
import cc.mallet.util.Randoms;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import gnu.trove.TDoubleArrayList;
/**
* $Id: TestUniNormalFactor.java,v 1.1 2007/10/22 21:37:41 mccallum Exp $
*/
public class TestUniNormalFactor extends TestCase {
public TestUniNormalFactor (String name)
{
super (name);
}
public void testVarSet ()
{
Variable var = new Variable (Variable.CONTINUOUS);
Factor f = new UniNormalFactor (var, -1.0, 1.5);
assertEquals (1, f.varSet ().size ());
assertTrue (f.varSet().contains (var));
}
public void testValue ()
{
Variable var = new Variable (Variable.CONTINUOUS);
Factor f = new UniNormalFactor (var, -1.0, 2.0);
Assignment assn1 = new Assignment (var, -1.0);
assertEquals (0.2821, f.value (assn1), 1e-4);
assertEquals (Math.log (0.2821), f.logValue (assn1), 1e-4);
Assignment assn2 = new Assignment (var, 1.5);
assertEquals (0.05913, f.value (assn2), 1e-4);
assertEquals (Math.log (0.05913), f.logValue (assn2), 1e-4);
}
public void testSample ()
{
Variable var = new Variable (Variable.CONTINUOUS);
Randoms r = new Randoms (2343);
Factor f = new UniNormalFactor (var, -1.0, 2.0);
TDoubleArrayList lst = new TDoubleArrayList ();
for (int i = 0; i < 10000; i++) {
Assignment assn = f.sample (r);
lst.add (assn.getDouble (var));
}
double[] vals = lst.toNativeArray ();
double mean = MatrixOps.mean (vals);
double std = MatrixOps.stddev (vals);
assertEquals (-1.0, mean, 0.025);
assertEquals (Math.sqrt(2.0), std, 0.01);
}
/**
* @return a <code>TestSuite</code>
*/
public static TestSuite suite ()
{
return new TestSuite (TestUniNormalFactor.class);
}
public static void main (String[] args)
{
TestSuite theSuite;
if (args.length > 0) {
theSuite = new TestSuite ();
for (int i = 0; i < args.length; i++) {
theSuite.addTest (new TestUniNormalFactor (args[i]));
}
} else {
theSuite = (TestSuite) suite ();
}
junit.textui.TestRunner.run (theSuite);
}
}