Developer chat

Didn’t have time to post a message here yesterday, but the modules have been added in this commit
I made a few changes this morning in this commit then corrected bugs and added the all_ for each module that needs it in this commit.

Finally in this commit I added five examples notebooks to check everything was working well (dogs and cats, cifar10, imdb classification, movie lens and rossmann).

As Jeremy explained, you shouldn’t touch the dev_nb anymore (except to add prose). Bug fixes should be done in the modules directly! You should also use a pip install -e of the new library to test those notebooks, to easily have the latest version installed.