def get_keys(self, index_name: str) -> List[str]:
    '\n        Return a list of the keys this indexer return from ``tokens_to_indices``.\n        '
    return [index_name]
Return a list of the keys this indexer return from ``tokens_to_indices``.
def get_keys(self, index_name: str) -> List[str]:
    '\n        \n        '
    return [index_name]