/// <summary>
/// Evolves population
/// </summary>
/// <param name="population"> population to be evolved (use ref keyword)</param>
public static void EvolvePopulation(ref Population population)
{
if (m_evolving)
{
return;
}
if (population == null || population.GetGenome(0) == null)
{
Debug.LogError("POPULATION IS NULL, WTF ARE YOU DOING?");
return;
}
m_evolving = true;
Population nPop = new Population(population.PopulationSize, population.GenomeSize());
if (m_elite)
{
nPop.InsertGenome(0, population.BestGenome);
}
int iVal = 0;
//offset for best fitt individual
if (m_elite)
{
iVal = 1;
}
///Breeding process
for (int i = iVal; i < population.PopulationSize; i = i + 2)
{
Genome parent1 = SelectionByTournament(population);
Genome parent2 = SelectionByTournament(population);
Genome[] children = CrossOver(parent1, parent2);
nPop.InsertGenome(i, children[0]);
if (i + 1 < population.PopulationSize)
{
nPop.InsertGenome(i + 1, children[1]);
}
}
//mutate after breeding
for (int i = iVal; i < nPop.PopulationSize; i++)
{
Mutate(nPop.GetGenome(i));
}
population = nPop;
m_generation++;
m_evolving = false;
}
/// <summary>
/// Selects the fittest genome out of a given number of genomes within a population
/// </summary>
/// <param name="population"></param>
/// <returns></returns>
private static Genome SelectionByTournament(Population population)
{
Genome geno = null;
Population tournamentCanditates = new Population(m_tournamentSize, population.GenomeSize());
System.Random random = new System.Random();
for (int i = 0; i < m_tournamentSize; i++)
{
int rgeno = random.Next(0, population.PopulationSize);
tournamentCanditates.InsertGenome(i, population.GetGenome(rgeno));
}
tournamentCanditates.EvaluatePopulation();
geno = tournamentCanditates.BestGenome;
return(geno);
}
