private static double[] tethaGradientValue(Individual tetha2, List<Individual> population)
{
Individual result = new Individual(tetha2 / Math.Pow(sigma, 2)); ;
for (int row = 0; row < population.Count; row++)
{
for (int col = row; col < population.Count; col++)
{
if (row == col) continue;
Individual secondTerm = new Individual(new Individual(population[row] - population[col]) * (double)(numberOfGames - 2 * population[row].Labels[col]));
result = new Individual(result + secondTerm);
Individual difference = new Individual(population[row] - population[col]);
double vValue = difference.DotProduct(tetha2.Weights);
Individual gOfXY = new Individual(difference * ((Math.Exp(vValue) - Math.Exp(-vValue)) / (Math.Exp(vValue) + Math.Exp(-vValue))));
result = new Individual(result + gOfXY);
}
}
return result.Weights;
}
private static double xStarFunctionValue(Individual xStar2, List<Individual> population)
{
Individual result = new Individual(xStar2 * (double)population.Count);
Individual sum = new Individual(new double[numberOfFeatures]);
double gOfXY = 0;
for (int index = 1; index < population.Count; index++)
{
sum = new Individual(sum + population[index]);
Individual newIndiv = new Individual(xStar2 - population[index]);
double localValue = newIndiv.DotProduct(tetha.Weights);
gOfXY += Math.Log(Math.Exp(localValue) + Math.Exp(-localValue));
}
result = new Individual(sum - result);
return result.DotProduct(tetha.Weights) + gOfXY;
}
private static double tethaFunctionValue(Individual tetha2, List<Individual> population)
{
double result = 0;
result += Math.Pow(tetha2.EuclideanNorm(),2) / 2 * Math.Pow(sigma, 2);
for (int row = 0; row < population.Count; row++)
{
for (int col = row; col < population.Count; col++)
{
if (row == col) continue;
Individual newIndiv = new Individual(population[row] - population[col]);
double localValue = newIndiv.DotProduct(tetha2.Weights);
double gOfXY = Math.Log(Math.Exp(localValue) + Math.Exp(-localValue));
localValue = localValue * (double)(numberOfGames - 2 * population[row].Labels[col]) + (double)numberOfGames * gOfXY;
result += localValue;
}
}
return result;
}