public static void Run()
{
int seed = 1;
var rng = new Random(seed);
OptimizationProblem optimizationProblem = new Rosenbrock();
var builder = new DifferentialEvolutionAlgorithm.Builder(optimizationProblem);
builder.PopulationSize = 100;
builder.MutationFactor = 0.6;
builder.CrossoverProbability = 0.9;
builder.ConvergenceCriterion = new MaxFunctionEvaluations(100000);
builder.RandomNumberGenerator = rng;
IOptimizationAlgorithm de = builder.Build();
IOptimizationAnalyzer analyzer = new OptimizationAnalyzer(de);
analyzer.Optimize();
double expectedFitness = 0.0;
var expectedDesign = Vector.CreateWithValue(optimizationProblem.Dimension, 1.0);
Assert.Equal(expectedFitness, de.BestFitness, 10);
Assert.True(Vector.CreateFromArray(de.BestPosition).Equals(expectedDesign, 1E-6));
}
public void TwoDim_EvaluatesCorrectValues(double[] values)
{
var evaluator = new Rosenbrock(2);
var ds = evaluator.GetGlobalOptimum().GetDecisionSpace();
var result = evaluator.Evaluate(DecisionVector.CreateFromArray(ds, new[] { values[0], values[1] }));
Assert.Equal(values[2], result.ElementAt(0));
}
//[Fact] // This algorithm is too slow for Rosenbrock test. It does converge though.
public static void TestBinaryGA()
{
int seed = 1;
var rng = new StandardGenerator(seed);
//var rng = RandomNumberGenerationUtilities.troschuetzRandom;
// Define optim problem
OptimizationProblem problem = new Rosenbrock();
// Define optim algorithm
var optimBuilder = new BinaryGeneticAlgorithmBuilder(problem);
optimBuilder.Logger = new BestOfIterationLogger();
// Setup logging
//optimBuilder.Logger = new EmptyLogger();
// Define convergence criteria
optimBuilder.ConvergenceCriterion = new MaxFunctionEvaluations(1000000);
// Define encoding
optimBuilder.Encoding = new GrayCoding(problem, 16, 8);
// Initialization
optimBuilder.Initializer = new RealUniformRandomInitializer(problem, rng);
// Define population size
optimBuilder.PopulationSize = 100;
// Define selection strategy
//optimBuilder.Selection = new RouletteWheelSelection<bool>(new InverseRankScaling<bool>(0.5));
//optimBuilder.Selection = new TournamentSelection<bool>(2, false);
//optimBuilder.Selection = new StochasticUniversalSampling<bool>(new InverseRankScaling<bool>(2.0
//optimBuilder.Selection = new RemainderStochasticSamplingWithReplacement<bool>(new InverseRankScaling<bool>(1.0));
optimBuilder.Selection = new TruncationSelection <bool>(rng, 0.5);
// Define recombination strategy
optimBuilder.Recombination = new SinglePointCrossover <bool>(rng);
// Define mutation strategy
optimBuilder.Mutation = new BitFlipMutation(0.05, rng);
// Start optimization
GeneticAlgorithm <bool> optimAlgorithm = optimBuilder.BuildAlgorithm();
optimAlgorithm.Solve();
// Check results
double expectedFitness = 0.0;
var expectedDesign = Vector.CreateWithValue(problem.Dimension, 1.0);
Assert.Equal(expectedFitness, optimAlgorithm.BestFitness, 10);
Assert.True(Vector.CreateFromArray(optimAlgorithm.BestPosition).Equals(expectedDesign, 1E-6));
}
public void Evaluate()
{
Rosenbrock function = new Rosenbrock();
Vector v1 = new Vector(new double[] { 1, 2, 3 });
Vector v2 = new Vector(new double[] { 3, 2, 1 });
Vector v3 = new Vector(new double[] { 1, 2, 3, 4 });
Assert.AreEqual(201, function.Evaluate(v1));
Assert.AreEqual(5805, function.Evaluate(v2));
Assert.AreEqual(2705, function.Evaluate(v3));
}
public void CalculateParabolaMinimum()
{
int _dim=5;
double []_data = {5,34,-12,55,6};
double []_reference = {0,0,0,0,0};
double _epsilon=1e-7;
double _realEpsilon = System.Math.Sqrt(_epsilon);
double _step=1000;
int _itmax=1000;
double diff;
Parabola func = new Parabola(_dim);
Rosenbrock objRosenbrock = new Rosenbrock(_dim, _data, func, _step, _epsilon, _itmax);
objRosenbrock.FindMinimum();
diff = NumericNet.CalcDiff(_dim,_reference,_data);
Assert.IsTrue(diff<_realEpsilon);
}
public void CalculateBananaMinimum()
{
int _dim=2;
double []_data = {5,34};
double []_reference = {1,1};
double _epsilon=1e-7;
double _realEpsilon = System.Math.Sqrt(_epsilon);
double _step=1000;
int _itmax=1000;
double diff;
Banana func = new Banana();
Rosenbrock objRosenbrock = new Rosenbrock(_dim, _data, func, _step, _epsilon, _itmax);
objRosenbrock.FindMinimum();
diff = NumericNet.CalcDiff(_dim,_reference,_data);
Assert.IsTrue(diff<_realEpsilon);
}
private void SolveClick(object sender, RoutedEventArgs args)
{
if (worker.IsBusy)
{
MessageBox.Show("Обрабатывается предыдущий запрос. Пожалуйста, подождите");
return;
}
if (function == null)
{
MessageBox.Show("Неверно задана функция");
return;
}
rosenbrock = new Rosenbrock(function, new Vector(X, Y), Epsilon)
{
Direction = ToMin ? OptimizationDirection.ToMin : OptimizationDirection.ToMax
};
worker.RunWorkerAsync();
}
public Vector Solve()
{
details = new List <PenaltySolverDetails>();
Vector x = startPoint;
while (true)
{
var r = new Rosenbrock(Function, x, epsilon);
Vector oldx = x;
x = r.Solve();
details.Add(new PenaltySolverDetails(mu, new SmartPoint(oldx), Math.Pow(Penalty(x), 2)));
if (details.Last().MuAlpha < epsilon)
{
break;
}
mu *= beta;
}
return(x);
}
public void CalculateBananaMinimum()
{
int _dim = 2;
double [] _data = { 5, 34 };
double [] _reference = { 1, 1 };
double _epsilon = 1e-7;
double _realEpsilon = System.Math.Sqrt(_epsilon);
double _step = 1000;
int _itmax = 1000;
double diff;
Banana func = new Banana();
Rosenbrock objRosenbrock = new Rosenbrock(_dim, _data, func, _step, _epsilon, _itmax);
objRosenbrock.FindMinimum();
diff = NumericNet.CalcDiff(_dim, _reference, _data);
Assert.IsTrue(diff < _realEpsilon);
}
public void CalculateParabolaMinimum()
{
int _dim = 5;
double [] _data = { 5, 34, -12, 55, 6 };
double [] _reference = { 0, 0, 0, 0, 0 };
double _epsilon = 1e-7;
double _realEpsilon = System.Math.Sqrt(_epsilon);
double _step = 1000;
int _itmax = 1000;
double diff;
Parabola func = new Parabola(_dim);
Rosenbrock objRosenbrock = new Rosenbrock(_dim, _data, func, _step, _epsilon, _itmax);
objRosenbrock.FindMinimum();
diff = NumericNet.CalcDiff(_dim, _reference, _data);
Assert.IsTrue(diff < _realEpsilon);
}
public static void ObliczIndiwFitness(Particle ind)
{
switch (FunctionName.type)
{
case FunctionName.Type.Schwefel:
Schwefel.setFitness(ind);
break;
case FunctionName.Type.DeJong1:
DeJong1.setFitness(ind);
break;
case FunctionName.Type.Rastrigin:
Rastrigin.setFitness(ind);
break;
case FunctionName.Type.Rosenbrock:
Rosenbrock.setFitness(ind);
break;
}
}
private static void Assignment2()
{
Console.WriteLine("--------------ASSIGNMENT [2]--------------------");
Console.WriteLine("Starting vector 1:");
var x1 = new DenseVector(new[] { -1.9, 2.0 });
Console.WriteLine(x1);
Console.WriteLine("Starting vector 2:");
Console.WriteLine();
var x2 = new DenseVector(new[] { 0.1, 0.3 });
Console.WriteLine(x2);
Console.WriteLine();
var function1 = new Rosenbrock();
Console.WriteLine(function1);
Console.WriteLine();
var function2 = new Function2();
Console.WriteLine(function2);
Console.WriteLine("ROSENBROCK ALGORITHMS: optimal gradient descent & Newton Raphson");
var optimalDescentRosenbrock = Algorithms.GradientDescent(function1, x1);
var newtonRaphsonRosenbrock = Algorithms.NewtonRaphson(function1, x1);
Console.WriteLine(optimalDescentRosenbrock);
Console.WriteLine(newtonRaphsonRosenbrock);
Console.WriteLine();
Console.WriteLine("F2 ALGORITHMS: optimal gradient descent & Newton Raphson");
var optimalDescentF2 = Algorithms.GradientDescent(function2, x2);
var newtonRaphsonF2 = Algorithms.NewtonRaphson(function2, x2);
Console.WriteLine(optimalDescentF2);
Console.WriteLine(newtonRaphsonF2);
Console.WriteLine("--------------------END----------------------");
}
private static void Assignment3()
{
Console.WriteLine("--------------ASSIGNMENT [3]--------------------");
Console.WriteLine("Starting vector 1:");
var x1 = new DenseVector(new[] { -1.9, 2.0 });
Console.WriteLine(x1);
Console.WriteLine("Starting vector 2:");
Console.WriteLine();
var x2 = new DenseVector(new[] { 0.1, 0.3 });
Console.WriteLine(x2);
Console.WriteLine();
var function1 = new Rosenbrock();
Console.WriteLine(function1);
Console.WriteLine();
var function2 = new Function2();
Console.WriteLine(function2);
internal void ObliczPopulFitness(FunctionName.Type type)
{
for (int j = 0; j < population.Count; j++)
{
switch (type)
{
case FunctionName.Type.DeJong1:
DeJong1.setFitness(population[j]);
break;
case FunctionName.Type.Schwefel:
Schwefel.setFitness(population[j]);
break;
case FunctionName.Type.Rastrigin:
Rastrigin.setFitness(population[j]);
break;
case FunctionName.Type.Rosenbrock:
Rosenbrock.setFitness(population[j]);
break;
}
}
}
public static void Main(string[] args)
{
var param = new Parametrii();
param.W = 0.729;
param.C1 = 1.49445;
param.C2 = 1.49445;
param.DimensiuneProblema = 3;
// Rastrigin
// param.Max = 5.12;
// param.Min = -5.12;
// Ackley
// param.Min = -32.768;
// param.Max = 32.768;
// nGriewank
param.Min = -600;
param.Max = 600;
param.NumarIteratii = 1000;
param.NumarParticule = 50;
param.VitezaMaxima = 1;
ProblemaDeBaza p = new Rastrigin();
var rez = p.Rezolva(param);
Console.WriteLine("Cost: " + rez.Cost);
foreach (var weight in rez.Pozitie)
{
Console.Write(weight + " ");
}
Console.WriteLine("\nRosenbrock");
p = new Rosenbrock();
rez = p.Rezolva(param);
Console.WriteLine("Cost: " + rez.Cost);
foreach (var weight in rez.Pozitie)
{
Console.Write(weight + " ");
}
Console.WriteLine("\nAckley");
p = new Ackley();
rez = p.Rezolva(param);
Console.WriteLine("Cost: " + rez.Cost);
foreach (var weight in rez.Pozitie)
{
Console.Write(weight + " ");
}
Console.WriteLine("\nGriewank");
p = new Griewank();
rez = p.Rezolva(param);
Console.WriteLine("Cost: " + rez.Cost);
foreach (var weight in rez.Pozitie)
{
Console.Write(weight + " ");
}
}