I particularly enjoy that Flux.jl is an AD framework and a couple lines of Julia code defining convenience functions for ML, and it is all written in Julia so it invites exploration.

Tim Besard gave a talk at a Tensorflow meetup recently that walked through the Julia stack (GPU&ML) that I would highly recommend: https://docs.google.com/presentation/d/1y93Kg8ZizvabKAGs-zmA...