A bug in iter_confusion_matrices

[yasirs]

This is the bug.

import yard
a = [(10,1),(20,0),(30,0),(40,1)]
d = yard.BinaryClassifierData(a)
list(d.iter_confusion_matrices([20,30,40]))
[(20, BinaryConfusionMatrix(tp=-1, fp=0, fn=3, tn=2)),
 (30, BinaryConfusionMatrix(tp=0, fp=1, fn=2, tn=1)),
 (40, BinaryConfusionMatrix(tp=0, fp=0, fn=2, tn=2)),
 (inf, BinaryConfusionMatrix(tp=-1, fp=0, fn=3, tn=2))]

Clearly, tp=-1 is wrong.

[ntamas]

Thanks, you seem to be spot on here. I'll check it tomorrow after I've slept a bit and merge it if it's OK.

[ntamas]

The final fix turned out to be different in the end because I wanted to make the results of get_confusion_matrix and iter_confusion_matrices consistent and I realized that inf should not be added to the end of the iterator when the thresholds are given explicitly. You should merge my changes into your branch to get the fix.