Hello! It seems that this typing is not compatible with latest versions of numpy. in typing.py: NDArray = Union[np.ndarray] Float64Array = np.ndarray[Any, np.dtype[np.double]] # pragma: no cover <---------- Int64Array = np.ndarray[Any, np.dtype[np.longlong]] # pragma: no cover Int32Array = np.ndarray[Any, np.dtype[np.intc]] # pragma: no cover