PDF for Cauchy prior

        Parameters
        ----------
        mu : float
            Latent variable for which the prior is being formed over

        Returns
        ----------
        - p(mu)

def pdf(self, mu):
        """
        PDF for Cauchy prior

        Parameters
        ----------
        mu : float
            Latent variable for which the prior is being formed over

        Returns
        ----------
        - p(mu)
        """
        return ss.cauchy.pdf(mu, self.loc0, self.scale0)