code: def irfs(self, **kwargs):
          
          dsval = kwargs.get('dataset', self.dataset(**kwargs))
          tokens = dsval.split('_')
          irf_name = "%s_%s_%s" % (DATASET_DICTIONARY['%s_%s' % (tokens[0], tokens[1])],
                                   EVCLASS_NAME_DICTIONARY[tokens[3]],
                                   kwargs.get('irf_ver'))
          return irf_name
docs: Get the name of IFRs associted with a particular dataset