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source: branches/GP-MoveOperators/HeuristicLab.Tests/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding-3.4/ChangeNodeTypeManipulationTest.cs @ 8085

Last change on this file since 8085 was 8085, checked in by gkronber, 12 years ago

#1847: merged trunk changes r7800:HEAD into gp move operators branch

File size: 3.1 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
25using HeuristicLab.Random;
26using Microsoft.VisualStudio.TestTools.UnitTesting;
27
28namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding_34.Tests {
29  [TestClass]
30  public class ChangeNodeTypeManipulationTest {
31    private const int POPULATION_SIZE = 1000;
32    private const int MAX_TREE_LENGTH = 100;
33    private const int MAX_TREE_DEPTH = 10;
34    private TestContext testContextInstance;
35
36    /// <summary>
37    ///Gets or sets the test context which provides
38    ///information about and functionality for the current test run.
39    ///</summary>
40    public TestContext TestContext {
41      get {
42        return testContextInstance;
43      }
44      set {
45        testContextInstance = value;
46      }
47    }
48
49    [TestMethod()]
50    public void ChangeNodeTypeManipulationDistributionsTest() {
51      SymbolicExpressionTreeStringFormatter formatter = new SymbolicExpressionTreeStringFormatter();
52      var trees = new List<ISymbolicExpressionTree>();
53      var grammar = Grammars.CreateArithmeticAndAdfGrammar();
54      var random = new MersenneTwister(31415);
55      int failedEvents = 0;
56      for (int i = 0; i < POPULATION_SIZE; i++) {
57        var tree = ProbabilisticTreeCreator.Create(random, grammar, MAX_TREE_LENGTH, MAX_TREE_DEPTH);
58        string originalTree = formatter.Format(tree);
59        ChangeNodeTypeManipulation.ChangeNodeType(random, tree);
60        string manipulatedTree = formatter.Format(tree);
61        if (originalTree == manipulatedTree) failedEvents++;
62        Util.IsValid(tree);
63        trees.Add(tree);
64      }
65      Console.WriteLine("ChangeNodeTypeManipulation: " + Environment.NewLine +
66        "Failed events: " + failedEvents * 100.0 / POPULATION_SIZE + " %" + Environment.NewLine +
67        Util.GetSizeDistributionString(trees, 105, 5) + Environment.NewLine +
68        Util.GetFunctionDistributionString(trees) + Environment.NewLine +
69        Util.GetNumberOfSubtreesDistributionString(trees) + Environment.NewLine +
70        Util.GetTerminalDistributionString(trees) + Environment.NewLine
71        );
72      Assert.IsTrue(failedEvents * 100.0 / POPULATION_SIZE < 5.0); // only max 5% failed mutations are allowed
73    }
74  }
75}
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