mirror of https://github.com/jlizier/jidt
88 lines
3.2 KiB
Java
Executable File
88 lines
3.2 KiB
Java
Executable File
/*
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* Java Information Dynamics Toolkit (JIDT)
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* Copyright (C) 2012, Joseph T. Lizier
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package infodynamics.measures.discrete;
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import infodynamics.utils.RandomGenerator;
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import junit.framework.TestCase;
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public class OInfoTester extends TestCase {
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public void testIndependent() throws Exception {
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OInfoCalculatorDiscrete oCalc = new OInfoCalculatorDiscrete(2, 3);
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double oinfo = oCalc.compute(new int[][] {{0,0,0},{0,0,1},{0,1,0},{0,1,1},{1,0,0},{1,0,1},{1,1,0},{1,1,1}});
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assertEquals(0.0, oinfo, 0.000001);
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}
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public void testXor() throws Exception {
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// 3 variables
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OInfoCalculatorDiscrete oCalc = new OInfoCalculatorDiscrete(2, 3);
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double oinfo = oCalc.compute(new int[][] {{0,0,1},{0,1,0},{1,0,0},{1,1,1}});
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assertEquals(-1.0, oinfo, 0.000001);
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// 4 variables
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oCalc = new OInfoCalculatorDiscrete(2, 4);
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oinfo = oCalc.compute(new int[][] {{0,0,0,1},{0,0,1,0},{0,1,0,0},{1,0,0,0},{1,1,1,0},{1,1,0,1},{1,0,1,1},{0,1,1,1}});
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assertEquals(-2.0, oinfo, 0.000001);
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}
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public void testCopy() throws Exception {
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// 3 variables
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OInfoCalculatorDiscrete oCalc = new OInfoCalculatorDiscrete(2, 3);
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double oinfo = oCalc.compute(new int[][] {{0,0,0},{1,1,1}});
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assertEquals(1.0, oinfo, 0.000001);
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// 4 variables
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oCalc = new OInfoCalculatorDiscrete(2, 4);
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oinfo = oCalc.compute(new int[][] {{0,0,0,0},{1,1,1,1}});
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assertEquals(2.0, oinfo, 0.000001);
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}
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public void testPairwise() throws Exception {
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// Variables 0 and 1 are correlated and independent from 2 and 3, that are
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// also correlated
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OInfoCalculatorDiscrete oCalc = new OInfoCalculatorDiscrete(2, 4);
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double oinfo = oCalc.compute(new int[][] {{0,0,0,0},{0,0,1,1},{1,1,0,0},{1,1,1,1}});
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assertEquals(0.0, oinfo, 0.000001);
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}
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public void testCompareTCAndDTC() throws Exception {
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// Generate random data and check that it matches the explicit computation
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// using TC and DTC calculators
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RandomGenerator rg = new RandomGenerator();
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int[][] data = rg.generateRandomInts(10, 4, 2);
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// O-info calculator
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OInfoCalculatorDiscrete oCalc = new OInfoCalculatorDiscrete(2, 4);
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double oinfo_direct = oCalc.compute(data);
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// TC and DTC calculators
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MultiInformationCalculatorDiscrete tcCalc = new MultiInformationCalculatorDiscrete(2, 4);
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DualTotalCorrelationCalculatorDiscrete dtcCalc = new DualTotalCorrelationCalculatorDiscrete(2, 4);
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tcCalc.initialise();
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tcCalc.addObservations(data);
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double oinfo_test = tcCalc.computeAverageLocalOfObservations() - dtcCalc.compute(data);
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assertEquals(oinfo_direct, oinfo_test, 0.000001);
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}
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}
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