private static List <Tree <string> > CalculateFitness(List <Tuple <List <float>, float> > data, List <Tree <string> > population, string[] terminals)
{
foreach (Tree <string> individual in population)
{
IOperand op = Evaluate(individual, terminals);
double totalError = 0, err = 0;
foreach (Tuple <List <float>, float> tuple in data)
{
double estimate = op.Compute(tuple.Item1.Select(d => (double)d).ToArray());
err = Math.Abs(estimate - tuple.Item2);
totalError += err;
}
if (double.IsNaN(totalError) || double.IsInfinity(totalError))
{
individual.Fitness = double.MaxValue;
}
else
{
individual.Fitness = totalError / data.Count;
}
if (totalError <= 0.1)
{
}
}
return(population.OrderBy(ind => ind.Fitness).ToList());
}