def _tokenize(self, text, **kwargs):
        """
        Converts a string in a sequence of tokens (string), using the tokenizer.
        """
        if self.do_lower_case:
            text = text.upper()

        return list(text.replace(" ", self.word_delimiter_token))

        Converts a string in a sequence of tokens (string), using the tokenizer.
        
dpkd/transformers/src/transformers/models/wav2vec2/tokenization_wav2vec2.py