code: def instance_for_arguments(self, arguments):
          
  
          model_instance = ModelInstance()
  
          for prior_model_tuple in self.prior_model_tuples:
              setattr(model_instance, prior_model_tuple.name,
                      prior_model_tuple.prior_model.instance_for_arguments(arguments))
  
          return model_instance
docs: Creates a ModelInstance, which has an attribute and class instance corresponding to every PriorModel
          attributed to this instance.
  
          Parameters
          ----------
          arguments : dict
              The dictionary representation of prior and parameter values. This is created in the model_instance_from_*
              routines.
  
          Returns
          -------
          model_instance : autofit.mapper.model.ModelInstance
              An object containing reconstructed model_mapper instances