[kmaehashi]

NumPy has a mechanism to dispatch execution to CuPy: https://numpy.org/neps/nep-0018-array-function-protocol.html

Just prepare the input on NumPy or CuPy, and then you can just feed it to NumPy APIs. NumPy functions will handle itself if the input is NumPy ndarray, or dispatch the execution to CuPy if the input is CuPy ndarray.