AUC & ROC for MultiClass Classification CNN

I’ve seen a few topics about this, but none of them have came to a working conclusion. I’m trying to get an AUC for each class as simply inserting AUROC() as a metric did not work. I know that scikit learn has a workingmulticlass/multilabel roc, but I do not know how to implement that into a fastai learner. I was wondering and hoping if anyone knew of an efficient way to calculate the AUC, even if its not as a metric. Thanks in advance!

Right here:

Gave it a shot, and got the following error: