public static double ComputeTwoClassAUC(this BasicEvaluation basicEvaluation)
{
double positives = basicEvaluation.TP + basicEvaluation.FN;
double negatives = basicEvaluation.TN + basicEvaluation.FP;
var tprate = positives > 0.0 ? basicEvaluation.TP / positives : 1.0;
var fprate = negatives > 0.0 ? basicEvaluation.TN / negatives : 1.0;
return((tprate + fprate) / 2.0);
}
public static double ComputeMultiClassAUC(int[,] confusionMatrix)
{
var eval = new BasicEvaluation();
for (int i = 0; i < confusionMatrix.GetLength(0); i++)
{
eval.TP += confusionMatrix[i, i];
for (int j = 0; j < confusionMatrix.GetLength(0); j++)
{
if (i != j)
{
eval.FN += confusionMatrix[i, j];
eval.FP += confusionMatrix[j, i];
eval.TN += confusionMatrix[j, j];
}
}
}
return(ComputeTwoClassAUC(eval));
}
