def __init__(self, name, filename=None):
        self.name = name
        super(NamedRequirements, self).__init__(filename=filename)
def test_impl(n):
            df = pd.DataFrame({'A': np.ones(n), 'B': np.random.ranf(n)})
            Ac = df.A.rolling(3, center=True).apply(lambda a: a[0] + 2 * a[1] + a[2])
            return Ac.sum()