protected Chromosome(Chromosome c1, Chromosome c2)
{
Debug.Assert(c1.Count == c2.Count);
if (1 == Randomizer.GetRandomIndex(2))
{
var temp = c1;
c1 = c2;
c2 = temp;
}
_weight = new double[c2.Count];
int crossOverIndex = Randomizer.GetRandomIndex(c2.Count);
for (int i = 0; i < _weight.Count(); ++i)
{
_weight[i] = i < crossOverIndex ? c1[i] : c2[i];
}
const double mutationRate = 0.1;
for (int i = 0; i < _weight.Count(); ++i)
{
if (Randomizer.GetRandomProbability() <= mutationRate)
_weight[i] = Randomizer.GetRandomWeight();
}
}
private static int CompareChromosomes(Chromosome c1, Chromosome c2)
{
const double minSelectionrate = 0.25;
if (c1.SelectionRate < minSelectionrate && c2.SelectionRate > minSelectionrate)
return 1;
if (c2.SelectionRate < minSelectionrate && c1.SelectionRate > minSelectionrate)
return -1;
if (c1.ROI == c2.ROI)
return 0;
else if (c1.ROI > c2.ROI)
return -1;
else
return 1;
}
internal static Chromosome Clone(Chromosome c1, Chromosome c2)
{
return c1.Count == c2.Count ? new Chromosome(c1, c2) : null;
}
private void TrainChromosome(IEnumerable<List<StarterInfo>> races, Chromosome chromosome, int currentIndex)
{
_nn.AssignSynapticWeightsFromChromosome(chromosome);
double totalAmountBet = 0.0;
double totalAmountWon = 0.0;
int numberOfBets = 0;
int numberOfRaces = 0;
foreach (var race in races)
{
++numberOfRaces;
var selectedStarter = _nn.GetWinningNeuron(race).StarterInfo;
if (null == selectedStarter)
{
// the dummy neuron was selected which means there is no bet at all
continue;
}
if(selectedStarter != ((OutputNeuron)_nn.OutputLayer[2]).StarterInfo)
{
continue;
}
totalAmountBet += 2.0;
++numberOfBets;
if(selectedStarter.FinishPosition == 1)
{
totalAmountWon += (selectedStarter.Odds + 1) * 2;
}
}
double roi = totalAmountBet > 1.0 ? totalAmountWon / totalAmountBet : 0.0;
double selectionRate = numberOfRaces > 1 ? (double) numberOfBets/numberOfRaces : 0;
chromosome.ROI = roi;
chromosome.SelectionRate = selectionRate;
PrintMessage(string.Format("currentIndex = {0} {1} ", currentIndex, chromosome));
}
public void AssignSynapticWeightsFromChromosome(Chromosome chromosome)
{
Debug.Assert(chromosome.Count == NumberOfSynapses);
var synapses = Synapses;
for(int i = 0; i < chromosome.Count; ++i)
{
synapses[i].Weight = chromosome[i];
}
}