public static double[] FindDistribution(this IEnumerable <Tuple <Instance, double> > source, Feature classFeature)
{
if (classFeature.FeatureType != FeatureType.Nominal)
{
throw new InvalidOperationException("Cannot find distribution for non-nominal class");
}
double[] result = new double[((NominalFeature)classFeature).Values.Length];
foreach (var tuple in source)
{
if (!FeatureValue.IsMissing(tuple.Item1[classFeature]))
{
int value = (int)tuple.Item1[classFeature];
result[value] += tuple.Item2;
}
}
return(result);
}
public string ToString(double value)
{
string strValue = FeatureValue.IsMissing(value) ? "?" : ValueToString(value);
return(string.Format("{0}={1}", Name, strValue));
}