src/transformers/models/marian/convert_marian_tatoeba_to_pytorch.py/TatoebaConverter/expand_group_to_two_letter_codes
class TatoebaConverter:    def expand_group_to_two_letter_codes(self, grp_name):
        return [self.get_two_letter_code(x) for x in self.constituents[grp_name]]