private void DiscreteRecombination(ref ESSolution offspring)
{
int index1, index2;
int index = 0;
GenerateTwoIndeces(out index1, out index2);
ESSolution parent1 = this.parentPopulation[index1];
ESSolution parent2 = this.parentPopulation[index2];
offspring = parent1.MakeDeepCopy();
foreach (var variable in base.context.Variables)
{
if (base.random.Next(0, 2) != 0)
{
base.modelBuilder.TryAssign(variable, parent2.currentModel.GetValue(variable.Term));
offspring.SetStdDev(index, parent2.GetStdDev(index));
}
index++;
}
offspring.UpdateModel(base.modelBuilder.ToArithmeticModel());
}
private TryGetModelResult Evolve(out IArithmeticModel model)
{
TryGetModelResult result = TryGetModelResult.None;
//SafeDebugger.Break();
CreateInitialPopulation();
EvaluateIntermediatePopulation();
for (int i = 0; i < this.populationSize; i++)
{
this.parentPopulation[i] = this.intermediatePopulation[i].MakeDeepCopy();
}
while (!Terminate(out result, out model))
{
ClearIntermediatePopulation();
if (this.populationSize > 1 && this.recombination != RecombinationStrategy.None &&
this.parentPopulation.Length > 1)
{
ESSolution offspring = null;
for (int i = 0; i < this.offspringPopulationSize; i++)
{
Recombine(ref offspring);
if (offspring != null)
{
Mutate(ref offspring);
this.intermediatePopulation.Add(offspring.MakeDeepCopy());
offspring.Dispose();
offspring = null;
}
}
}
else
{
ESSolution offspring = null;
int poolIndex = 0;
for (int i = 0; i < this.offspringPopulationSize; i++)
{
if (poolIndex >= this.parentPopulation.Length)
{
poolIndex = 0;
}
offspring = this.parentPopulation[poolIndex].MakeDeepCopy();
Mutate(ref offspring);
this.intermediatePopulation.Add(offspring.MakeDeepCopy());
offspring.Dispose();
offspring = null;
poolIndex++;
}
}
EvaluateIntermediatePopulation();
//selection
if (!this.selectFromOffspringOnly)
{
for (int i = 0; i < this.populationSize; i++)
{
this.intermediatePopulation.Add(this.parentPopulation[i].MakeDeepCopy());
}
}
this.intermediatePopulation.Sort();
for (int i = 0; i < this.populationSize && i < this.intermediatePopulation.Count; i++)
{
this.parentPopulation[i].Dispose();
this.parentPopulation[i] = this.intermediatePopulation[i].MakeDeepCopy();
}
}
return(result);
}