def parallel_process_text(self, data: List[str]) -> List[List[str]]:
        """Apply cleaner -> tokenizer."""
        process_text = process_text_constructor(cleaner=self.cleaner,
                                                tokenizer=self.tokenizer,
                                                append_indicators=self.append_indicators,
                                                start_tok=self.start_tok,
                                                end_tok=self.end_tok)
        n_cores = self.num_cores
        return flattenlist(apply_parallel(process_text, data, n_cores))
Apply cleaner -> tokenizer.