Numpy 1.20 has been released a few minutes ago and it is breaking some stuff, especially the np.core.umath API is not more, and many Numpy methods are features typing. On my side, it is breaking pylint / mypy check (in a good way, because it catches "errors" not detected before). The issue with this release is that it is NOT compatible with Python3.6, so it may be hard to support it and fix type checking for both.

So I suggest explicitly restricting Numpy to prio versions for now as a quick fix, just changing this line.