Returns
        -------
        prior_tuple_dict: [(Prior, PriorTuple)]
            The set of all priors associated with this mapper

def prior_tuples(self):
        """
        Returns
        -------
        prior_tuple_dict: [(Prior, PriorTuple)]
            The set of all priors associated with this mapper
        """
        return {prior_tuple.prior: prior_tuple
                for name, prior_model in self.prior_model_tuples
                for prior_tuple in prior_model.prior_tuples}.values()