Is there a way to create a confusion matrix with items other than numbers? For example, on an OCR project I want to create a csv with A-Z in the column header and A-Z on the row header with the data being how many mistakes were made. I would provide data as in input like this:

GroundTruth,OCROutput
A,A
B,B
B,8

If I've read the code correctly, I only see a way to create a confusion matrix with numbers.

I'd also like to have properties for precision, recall, f-measure, accuracy, failure rate. So maybe this is just a feature request, if the ability doesn't exist.

Thanks,
Darren