public static double ComputeROCAUCTrapeziod <RealType>(IList <bool> labels, IList <RealType> sample)
where RealType : IComparable <RealType>
{
int postive_count = ToolsCollection.CountOccurance(labels, true);
double true_positive_increment = 1.0 / postive_count;
double false_positive_increment = 1.0 / (labels.Count - postive_count);
double[] true_positive_rates = new double[labels.Count + 1];
double[] false_positive_rates = new double[labels.Count + 1];
List <int> ordering = ToolsMathCollection.Ordering(sample);
for (int index = 1; index < labels.Count + 1; index++)
{
if (labels[ordering[index - 1]])
{
true_positive_rates[index] = true_positive_rates[index - 1] + true_positive_increment;
false_positive_rates[index] = false_positive_rates[index - 1];
}
else
{
true_positive_rates[index] = true_positive_rates[index - 1];
false_positive_rates[index] = false_positive_rates[index - 1] + false_positive_increment;
}
}
return(IntegralEvaluatorTrapezoid.EvaluateStaticValue(false_positive_rates, true_positive_rates));
}
public static RealType MeanAll <RealType>(IAlgebraReal <RealType> algebra, IList <IList <RealType> > samples)
{
RealType total_count = algebra.AddIdentity;
RealType total_sum = algebra.AddIdentity;
foreach (IList <RealType> sample in samples)
{
total_count = algebra.Add(total_count, algebra.ToDomain((float)sample.Count));
total_sum = algebra.Add(total_sum, ToolsMathCollection.Sum(algebra, sample));
}
return(algebra.Divide(total_sum, total_count));
}
public static double[] Shift(double[] domain, double[] range, double shift)
{
return(Resample(domain, range, ToolsMathCollection.Add(domain, shift)));
}
public static RealType Mean <RealType>(
IAlgebraReal <RealType> algebra,
IList <RealType> sample_0)
{
return(algebra.Divide(ToolsMathCollection.Sum(algebra, sample_0), algebra.ToDomain((float)sample_0.Count)));
}