About train/test data in MPIIGaze.h5

[biyoml]

I found that in src/dpg_train.py, you loaded the MPIIGaze.h5 with keys 'train/' + s for s in other_person_ids and 'test/' + person_id for each fold of leave-one-person-out cross validation.
May I ask where the test set in MPIIGaze.h5 came from?
What is the reason that you didn't take 'train/' + person_id as a hold out, but 'test/' + person_id instead?