//N_Point Crossover
//Basic theory:
//1: random probability of happening the crossover between 0f and 1f
//Loop through all chromossome pairs
//Pick a random position to cut (n_cuts) ---------> should be dynamically changed in Unity, not in the code
//Create 2 new chromossomes with the two parts cut (Clone?)
private void n_Crossover(Individual partner, float probability)
{
BitFlipIndividual bitFlipPartner = (BitFlipIndividual)partner;
//Debug.Log (n_cuts + " cuts");
if (UnityEngine.Random.Range(0f, 1f) > probability)
{
return;
}
int crossoverPoint = Mathf.FloorToInt(chromosomeSize / (n_cuts + 1));
for (int i = crossoverPoint; i < chromosomeSize; i += 2 * crossoverPoint)
{
for (int j = i; j < chromosomeSize && j < i + crossoverPoint; j++)
{
int temp1 = chromosome1 [j];
bool temp2 = chromosome2 [j];
chromosome1 [j] = bitFlipPartner.chromosome1 [j];
chromosome2 [j] = bitFlipPartner.chromosome2 [j];
bitFlipPartner.chromosome1 [j] = temp1;
bitFlipPartner.chromosome2 [j] = temp2;
}
}
}
public virtual void InitPopulation()
{
switch (typeOfIndividual)
{
case IndividualType.Example:
population = new List <Individual> ();
while (population.Count < populationSize)
{
ExampleIndividual new_ind = new ExampleIndividual(individualSize, individualMultiplier);
new_ind.Initialize();
new_ind.Translate();
population.Add(new_ind);
}
break;
case IndividualType.BitFlip:
population = new List <Individual> ();
while (population.Count < populationSize)
{
BitFlipIndividual new_ind = new BitFlipIndividual(individualSize, individualMultiplier);
new_ind.Initialize();
new_ind.Translate();
population.Add(new_ind);
}
break;
}
}
public override Individual Clone()
{
BitFlipIndividual new_ind = new BitFlipIndividual(totalSize, multiplier);
chromosome1.CopyTo(new_ind.chromosome1, 0);
chromosome2.CopyTo(new_ind.chromosome2, 0);
//new_ind.Translate ();
new_ind.fitness = 0.0f;
new_ind.evaluated = false;
return(new_ind);
}
private void onePointCrossover(Individual partner, float probability)
{
BitFlipIndividual bitFlipPartner = (BitFlipIndividual)partner;
//go through chromosomes and alternate the according chromosome from parent1 and parent2
int[] newChromosome1 = new int[chromosomeSize];
int[] newPartnerChromosome1 = new int[chromosomeSize];
bool[] newChromosome2 = new bool[chromosomeSize];
bool[] newPartnerChromosome2 = new bool[chromosomeSize];
if (Random.Range(0f, 1f) <= probability)
{
int cutoffPoint = Random.Range(0, chromosomeSize);
for (int i = 0; i < cutoffPoint; i++)
{
newChromosome1 [i] = chromosome1 [i];
newChromosome2 [i] = chromosome2 [i];
newPartnerChromosome1 [i] = bitFlipPartner.chromosome1 [i];
newPartnerChromosome2 [i] = bitFlipPartner.chromosome2 [i];
}
for (int i = cutoffPoint; i < chromosomeSize; i++)
{
newChromosome1 [i] = bitFlipPartner.chromosome1 [i];
newChromosome2 [i] = bitFlipPartner.chromosome2 [i];
newPartnerChromosome1 [i] = chromosome1 [i];
newPartnerChromosome2 [i] = chromosome2 [i];
}
}
chromosome1 = newChromosome1;
chromosome2 = newChromosome2;
bitFlipPartner.chromosome1 = newPartnerChromosome1;
bitFlipPartner.chromosome2 = newPartnerChromosome2;
}
