constructor(config) {
        super(config);

        this.pad_token = this.config.pad_token;
        this.word_delimiter_token = this.config.word_delimiter_token;
        this.cleanup = this.config.cleanup;
    }
The CTC (Connectionist Temporal Classification) decoder.
See https://github.com/huggingface/tokenizers/blob/bb38f390a61883fc2f29d659af696f428d1cda6b/tokenizers/src/decoders/ctc.rs