Numpy type hinting

[U8NWXD]

MyPy does not appear to support type hinting numpy, so for now we will tell mypy to ignore numpy with # type: ignore at the end of the import statement. Ideally, we will somehow add type hinting support for numpy by providing stub files. Here are some useful links:

• Type hinting / annotation (PEP 484) for ndarray, dtype, and ufunc numpy/numpy#7370
• https://stackoverflow.com/questions/35673895/type-hinting-annotation-pep-484-for-numpy-ndarray/35688036#35688036
• https://github.com/machinalis/mypy-data/tree/master/numpy-mypy