Documentation for Pets Data in Lesson 1

Has anyone found or written succinct documentation for how the pets data is used in lesson 1? As it says in the lesson, it’s the Oxford-IIIT Pet Dataset, from here:

I’m looking for somewhere to go for things like:

  • for the record, stating what list.txt and trainval.txt are used for

  • both files contain CLASS-ID, SPECIES, and BREED-ID values. Which are used?
    (CLASS-ID and BREED-ID seem redundant tbh - one is unique for each class, one is unique within each species. Why both? Which does fastai use?)

  • There are a lot of files that fastai won’t use, e.g. annotations/trimaps/* (the outlines)