I deleted the code that imports "imp", from "cloudpickle.py" and the warning is gone but I hope I didn't mess up anything. You can also simply ignore this, since it's not an error.
Edit: I don't want to remove the question or answer because people still visit this page but this is not a solution and it is a bad way to handle it, just ignore this warning. I did this in my very amateur days, sorry :(
