mapping predict_proba columns to class labels about mlens

[flennerhag]

Currently, ml-ensemble only handles numerical class labels. In this case, the class label corresponds to the column index, so there shouldn't be any need to access a classes_ attribute. For instance, an ensemble of two estimators with 2 class labels would have the following column structure:

col=0	col=1	col=2	col=3
est=0	est=0	est=1	est=1
label=0	label=1	label=0	label=1

If you really want to access the classes_ attribute of an estimator, you can with

sl.layer_1.learners[0]._learner_[0].estimator.classes_

Adjust for the layer and estimator you want to look at. Note that the backend structure may change so this way of access the classes_ attribute can break without warning.

[philrhinehart]

Ok, thanks! I had a feeling this was the case but wasn't sure if it was a guarantee.