001package org.cpsolver.ifs.example.csp;
002
003import org.cpsolver.ifs.solution.Solution;
004import org.cpsolver.ifs.solver.Solver;
005import org.cpsolver.ifs.util.ToolBox;
006
007/**
008 * Simple test of IFS CBS algorithm on random binary CSP problem
009 * CSP(25,12,198/300,36/144).
010 * 
011 * @version IFS 1.3 (Iterative Forward Search)<br>
012 *          Copyright (C) 2006 - 2014 Tomáš Müller<br>
013 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
014 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
015 * <br>
016 *          This library is free software; you can redistribute it and/or modify
017 *          it under the terms of the GNU Lesser General Public License as
018 *          published by the Free Software Foundation; either version 3 of the
019 *          License, or (at your option) any later version. <br>
020 * <br>
021 *          This library is distributed in the hope that it will be useful, but
022 *          WITHOUT ANY WARRANTY; without even the implied warranty of
023 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
024 *          Lesser General Public License for more details. <br>
025 * <br>
026 *          You should have received a copy of the GNU Lesser General Public
027 *          License along with this library; if not see
028 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
029 */
030public class SimpleTest {
031    /**
032     * run the test
033     * @param args program arguments
034     */
035    public static void main(String[] args) {
036        ToolBox.configureLogging();
037        int nrVariables = 25;
038        int nrValues = 12;
039        int nrConstraints = 198;
040        double tigtness = 0.25;
041        int nrAllPairs = nrValues * nrValues;
042        int nrCompatiblePairs = (int) ((1.0 - tigtness) * nrAllPairs);
043        long seed = System.currentTimeMillis();
044        System.out.println("CSP(" + nrVariables + "," + nrValues + "," + nrConstraints + "/"
045                + ((nrVariables * (nrVariables - 1)) / 2) + "," + (nrAllPairs - nrCompatiblePairs) + "/" + nrAllPairs
046                + ")");
047
048        org.cpsolver.ifs.util.DataProperties cfg = new org.cpsolver.ifs.util.DataProperties();
049        cfg.setProperty("Termination.Class", "org.cpsolver.ifs.termination.GeneralTerminationCondition");
050        cfg.setProperty("Termination.StopWhenComplete", "false");
051        cfg.setProperty("Termination.TimeOut", "60");
052        cfg.setProperty("Comparator.Class", "org.cpsolver.ifs.solution.GeneralSolutionComparator");
053        cfg.setProperty("Value.Class", "org.cpsolver.ifs.heuristics.GeneralValueSelection");
054        cfg.setProperty("Value.WeightConflicts", "1");
055        cfg.setProperty("Variable.Class", "org.cpsolver.ifs.heuristics.GeneralVariableSelection");
056        cfg.setProperty("Extensions.Classes", "org.cpsolver.ifs.extension.ConflictStatistics");
057
058        CSPModel model = new CSPModel(nrVariables, nrValues, nrConstraints, nrCompatiblePairs, seed);
059        Solver<CSPVariable, CSPValue> solver = new Solver<CSPVariable, CSPValue>(cfg);
060        solver.setInitalSolution(model);
061
062        solver.start();
063        try {
064            solver.getSolverThread().join();
065        } catch (InterruptedException e) {
066        }
067
068        Solution<CSPVariable, CSPValue> solution = solver.lastSolution();
069        solution.restoreBest();
070
071        System.out.println("Best solution found after " + solution.getBestTime() + " seconds ("
072                + solution.getBestIteration() + " iterations).");
073        System.out.println("Number of assigned variables is " + solution.getAssignment().nrAssignedVariables());
074        System.out.println("Total value of the solution is " + solution.getModel().getTotalValue(solution.getAssignment()));
075
076        int idx = 1;
077        for (CSPVariable v : solution.getModel().variables()) {
078            CSPValue a = solution.getAssignment().getValue(v);
079            if (a != null)
080                System.out.println("Var" + (idx++) + "=" + a.toDouble());
081        }
082    }
083}