001package org.cpsolver.ifs.example.csp;
002
003import org.cpsolver.ifs.solution.Solution;
004import org.cpsolver.ifs.solver.Solver;
005
006/**
007 * Simple test of IFS CBS algorithm on random binary CSP problem
008 * CSP(25,12,198/300,36/144).
009 * 
010 * @version IFS 1.3 (Iterative Forward Search)<br>
011 *          Copyright (C) 2006 - 2014 Tomáš Müller<br>
012 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
013 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
014 * <br>
015 *          This library is free software; you can redistribute it and/or modify
016 *          it under the terms of the GNU Lesser General Public License as
017 *          published by the Free Software Foundation; either version 3 of the
018 *          License, or (at your option) any later version. <br>
019 * <br>
020 *          This library is distributed in the hope that it will be useful, but
021 *          WITHOUT ANY WARRANTY; without even the implied warranty of
022 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
023 *          Lesser General Public License for more details. <br>
024 * <br>
025 *          You should have received a copy of the GNU Lesser General Public
026 *          License along with this library; if not see
027 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
028 */
029public class SimpleTest {
030    /**
031     * run the test
032     * @param args program arguments
033     */
034    public static void main(String[] args) {
035        org.apache.log4j.BasicConfigurator.configure();
036        int nrVariables = 25;
037        int nrValues = 12;
038        int nrConstraints = 198;
039        double tigtness = 0.25;
040        int nrAllPairs = nrValues * nrValues;
041        int nrCompatiblePairs = (int) ((1.0 - tigtness) * nrAllPairs);
042        long seed = System.currentTimeMillis();
043        System.out.println("CSP(" + nrVariables + "," + nrValues + "," + nrConstraints + "/"
044                + ((nrVariables * (nrVariables - 1)) / 2) + "," + (nrAllPairs - nrCompatiblePairs) + "/" + nrAllPairs
045                + ")");
046
047        org.cpsolver.ifs.util.DataProperties cfg = new org.cpsolver.ifs.util.DataProperties();
048        cfg.setProperty("Termination.Class", "org.cpsolver.ifs.termination.GeneralTerminationCondition");
049        cfg.setProperty("Termination.StopWhenComplete", "false");
050        cfg.setProperty("Termination.TimeOut", "60");
051        cfg.setProperty("Comparator.Class", "org.cpsolver.ifs.solution.GeneralSolutionComparator");
052        cfg.setProperty("Value.Class", "org.cpsolver.ifs.heuristics.GeneralValueSelection");
053        cfg.setProperty("Value.WeightConflicts", "1");
054        cfg.setProperty("Variable.Class", "org.cpsolver.ifs.heuristics.GeneralVariableSelection");
055        cfg.setProperty("Extensions.Classes", "org.cpsolver.ifs.extension.ConflictStatistics");
056
057        CSPModel model = new CSPModel(nrVariables, nrValues, nrConstraints, nrCompatiblePairs, seed);
058        Solver<CSPVariable, CSPValue> solver = new Solver<CSPVariable, CSPValue>(cfg);
059        solver.setInitalSolution(model);
060
061        solver.start();
062        try {
063            solver.getSolverThread().join();
064        } catch (InterruptedException e) {
065        }
066
067        Solution<CSPVariable, CSPValue> solution = solver.lastSolution();
068        solution.restoreBest();
069
070        System.out.println("Best solution found after " + solution.getBestTime() + " seconds ("
071                + solution.getBestIteration() + " iterations).");
072        System.out.println("Number of assigned variables is " + solution.getAssignment().nrAssignedVariables());
073        System.out.println("Total value of the solution is " + solution.getModel().getTotalValue(solution.getAssignment()));
074
075        int idx = 1;
076        for (CSPVariable v : solution.getModel().variables()) {
077            CSPValue a = solution.getAssignment().getValue(v);
078            if (a != null)
079                System.out.println("Var" + (idx++) + "=" + a.toDouble());
080        }
081    }
082}