I'm not familiar with the python ray package. If you are familiar with actors as they exist in erlang and elixir, there's a comparison of those to Pony that might help your understanding.
Turns out an easy google search answered my question as well... this post https://medium.com/distributed-computing-with-ray/ray-for-th... does say that ray uses the actor model, and ray is listed on The Actor Model wikipedia page as an Actor Model library.
https://www.youtube.com/watch?v=_0m0_qtfzLs