code: def prior_prior_model_dict(self):
          
          return {prior: prior_model[1] for prior_model in self.prior_model_tuples for _, prior in
                  prior_model[1].prior_tuples}
docs: Returns
          -------
          prior_prior_model_dict: {Prior: PriorModel}
              A dictionary mapping priors to associated prior models. Each prior will only have one prior model; if a
              prior is shared by two prior models then one of those prior models will be in this dictionary.