human
I wrote the below code

    be = get_backend(request, datatype=np.float64)
    def cleanup():
        be = request.getfuncargvalue('backend_cpu64')
        del be
    request.addfinalizer(cleanup)
    return be

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

@pytest.fixture(scope='module', params=['cpu'])
def backend_cpu64(request):