I think this is the best answer, as someone who's been using the language for most of my work for a few years (but not in ML). Flux.jl is probably the highest-

I think this is the best answer, as someone who's been using the language for most of my work for a few years (but not in ML). Flux.jl is probably the highest-profile relevant effort, but it's been (AFAIU) pretty much entirely volunteer-developed for the past 2+ years.