You imply it’s really C++, fair enough, my main point was, why not Julia? And maybe you imply that combination is good enough, Julia not needed. I think most users use Python, without knowing or caring C++ powers it, not just in AI. I suppose (some of the) research people really do stuff in C++ though.
Also why not then use GitHub - boathit/JuliaTorch: Using PyTorch in Julia Language wrapper, rather than Python directly and C++ indirectly?