code: def pdf_link(self, link_f, y, Y_metadata=None):
          
          return np.exp(self.logpdf_link(link_f, y, Y_metadata=Y_metadata))
docs: :param link_f: latent variables link(f)
          :type link_f: Nx1 array
          :param y: data
          :type y: Nx1 array
          :param Y_metadata: includes censoring information in dictionary key 'censored'
          :returns: likelihood evaluated for this point
          :rtype: float