Markov blanket for the Poisson distribution

        Parameters
        ----------
        y : np.ndarray
            univariate time series

        mean : np.ndarray
            array of location parameters for the Poisson distribution

        scale : float
            scale parameter for the Poisson distribution

        shape : float
            tail thickness parameter for the Poisson distribution

        skewness : float
            skewness parameter for the Poisson distribution

        Returns
        ----------
        - Markov blanket of the Poisson family

def markov_blanket(y, mean, scale, shape, skewness):
        """ Markov blanket for the Poisson distribution

        Parameters
        ----------
        y : np.ndarray
            univariate time series

        mean : np.ndarray
            array of location parameters for the Poisson distribution

        scale : float
            scale parameter for the Poisson distribution

        shape : float
            tail thickness parameter for the Poisson distribution

        skewness : float
            skewness parameter for the Poisson distribution

        Returns
        ----------
        - Markov blanket of the Poisson family
        """
        return ss.poisson.logpmf(y, mean)