Numba is not made by NVidia. It is [1] made by Anaconda (formerly Continuum Analytics), which was co-founded by Travis Oliphant, the primary author of NumPy.
They aren't drivers, it's just the ability to generate CUDA kernels in Numba. It has nothing to do with Nvidia supporting it, they were not involved AFAIK.
Interesting, thanks :-) either way, we’re all set to accelerate Python code on the GPU! Personally I intend to focus my efforts here rather than learning Julia.