Default cuda backend selection#385
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This replaces PyCUDA with cuda-python as the default backend.
The default selection scheme is slightly more sophisticated now. cuda-python is only selected when it is installed. If you only have pycuda installed, pycuda will still be the default backend.
Specifically, if
lang=option does not explicitly select a CUDA backend, meaning it is "CUDA" and not any of "PYCUDA", "CUPY", or "NVCUDA", the selection order for a CUDA backend now is: