public static Func<Tuple<IInd, IInd>> SelectTwoParents(IInd[] population, double[] fitnesses)
{
_population = population;
_fitnesses = fitnesses;
_tournamentSize = (int)Math.Round(_population.Length * 0.1);
Func<Tuple<IInd, IInd>> res = TournamentSelection;
return res;
}
public static double ComputeFitness(IInd inputInd)
{
//Convert StringInd.Value to a string of bits, for each 1 in the bits array add 1 to the fitness,
//divide the fitness by the amount of bits
Char[] bits = inputInd.ToCharArray();
var fitness = bits.Where(x => x == '1').Sum(x => 1.0);
fitness = fitness/bits.Length;
return fitness;
}
public static double ComputeFitness(IInd inputInd)
{
double[] squaredErrors = new double[_dataSet.Count];
for (int i = 0; i < _dataSet.Count; i++)
{
double sP = 0;
var line = _dataSet[i];
for (int j = 0; j < line.Length-1; j++)
{
var dataValue = line[j];
var indValue = inputInd.getDoubleArray()[j];
sP += (dataValue*indValue);
}
squaredErrors[i] = Math.Pow((line[line.Length - 1] - sP), 2);
}
return squaredErrors.Sum();
}
public static IInd Mutation(IInd inpStringInd, double rate)
{
Char[] inpBits = inpStringInd.ToCharArray();
for (int i = 0; i < inpBits.Length; i++)
{
var r = Rand.NextDouble();
if (r <= rate)
{
switch (inpBits[i])
{
case '0':
inpBits[i] = '1';
break;
case '1':
inpBits[i] = '0';
break;
}
}
}
IInd res = new StringInd(new string(inpBits));
return res;
}
public static IInd Mutation(IInd inpStringInd, double rate)
{
double[] values = inpStringInd.getDoubleArray();
for (int i = 0; i < values.Length; i++)
{
var r = Rand.NextDouble();
if (r <= rate)
{
values[i] = Rand.NextDouble() * (maxVal - minVal) + minVal;
}
}
IInd res = new DoubleInd(values);
return res;
}
