@classmethod
def gaussian(cls, mu, sigma):
    """
        Visualization for a Gaussian distribution
        Args:
            mu, sigma (float): parameters to a Gaussian distribution
        Returns:
            image (IPython.display.Image): The image that can be displayed inline in a Jupyter notebook
        """
    if sigma <= 0:
        raise ValueError(
            'For a Gaussian distribution, sigma should be greater than zero.')
    return cls._call_post(dist='gaussian', mu=mu, sigma=sigma)
