#region License Information
/* HeuristicLab
* Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
*
* This file is part of HeuristicLab.
*
* HeuristicLab is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* HeuristicLab is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with HeuristicLab. If not, see .
*/
#endregion
using System;
using System.Collections.Generic;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Random;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Tests {
[TestClass]
public class ChangeNodeTypeManipulationTest {
private const int POPULATION_SIZE = 1000;
private const int MAX_TREE_LENGTH = 100;
private const int MAX_TREE_DEPTH = 10;
[TestMethod]
[TestCategory("Encodings.SymbolicExpressionTree")]
[TestProperty("Time", "medium")]
public void ChangeNodeTypeManipulationDistributionsTest() {
SymbolicExpressionTreeStringFormatter formatter = new SymbolicExpressionTreeStringFormatter();
var trees = new List();
var grammar = Grammars.CreateArithmeticAndAdfGrammar();
var random = new MersenneTwister(31415);
int failedEvents = 0;
for (int i = 0; i < POPULATION_SIZE; i++) {
var tree = ProbabilisticTreeCreator.Create(random, grammar, MAX_TREE_LENGTH, MAX_TREE_DEPTH);
string originalTree = formatter.Format(tree);
ChangeNodeTypeManipulation.ChangeNodeType(random, tree);
string manipulatedTree = formatter.Format(tree);
if (originalTree == manipulatedTree) failedEvents++;
Util.IsValid(tree);
trees.Add(tree);
}
Console.WriteLine("ChangeNodeTypeManipulation: " + Environment.NewLine +
"Failed events: " + failedEvents * 100.0 / POPULATION_SIZE + " %" + Environment.NewLine +
Util.GetSizeDistributionString(trees, 105, 5) + Environment.NewLine +
Util.GetFunctionDistributionString(trees) + Environment.NewLine +
Util.GetNumberOfSubtreesDistributionString(trees) + Environment.NewLine +
Util.GetTerminalDistributionString(trees) + Environment.NewLine
);
Assert.IsTrue(failedEvents * 100.0 / POPULATION_SIZE < 5.0); // only max 5% failed mutations are allowed
}
}
}