src/transformers/models/xlm_roberta/tokenization_xlm_roberta.py/XLMRobertaTokenizer/convert_tokens_to_string
class XLMRobertaTokenizer:    def convert_tokens_to_string(self, tokens):
        """Converts a sequence of tokens (strings for sub-words) in a single string."""
        out_string = "".join(tokens).replace(SPIECE_UNDERLINE, " ").strip()
        return out_string