src/transformers/models/perceiver/tokenization_perceiver.py/PerceiverTokenizer/_tokenize
class PerceiverTokenizer:    def _tokenize(self, text: str) -> List[str]:
        """Take as input a string and return a list of strings (tokens) for words/sub-words"""
        tokens = [chr(i) for i in text.encode("utf-8")]
        return tokens