You may have noticed that I failed to save a hold-out test set in the nested cross-validation examples (Section XXXXXXXXXXSo, we really don’t have an independent, final evaluation of the system we...

You may have noticed that I failed to save a hold-out test set in the nested cross-validation examples (Section 11.3). So, we really don’t have an independent, final evaluation of the system we developed there. Wrap the entire process we built in Section 11.3 inside of a
simple
train-test split to remedy that.