def normal_noise(points):
    """Init a noise variable."""
    return np.random.rand(1) * np.random.randn(points, 1) \
        + random.sample([2, -2], 1)
def normal_noise(points):
    """Init a noise variable."""
    return np.random.rand(1) * np.random.randn(points, 1) \
        + random.sample([2, -2], 1)
Init a noise variable.