docs: def prior_tuples(self):
          """
          Returns
          -------
          priors: [(String, Prior))]
          """
          return [prior for tuple_prior in self.tuple_prior_tuples for prior in
                  tuple_prior[1].prior_tuples] + self.direct_prior_tuples + [prior for prior_model in
                                                                             self.prior_model_tuples
                                                                             for prior in
                                                                             prior_model[1].prior_tuples]