human
Solve the following python programming problem given the following code:
@pytest.fixture(scope='module', params=['cpu'])
def backend_cpu64(request):
assistant
#Here is the Python program you requested.

    """Fixture that returns a cpu backend using 64 bit dtype.
    For use in tests like gradient checking whihch need higher
    precision
    """
    be = get_backend(request, datatype=np.float64)
    def cleanup():
        be = request.getfuncargvalue('backend_cpu64')
        del be
    request.addfinalizer(cleanup)
    return be