There are cases in ML where python isn't performant enough, so much so, that the state of the art for a while converged on how to circumvent Python. This happen

There are cases in ML where python isn't performant enough, so much so, that the state of the art for a while converged on how to circumvent Python. This happens when the model interacts with the outside world (environment) a lot or when you are limited to non vectorizable environments. Python simply adds too much friction to the mix.