src/transformers/models/speech_to_text_2/tokenization_speech_to_text_2.py/Speech2Text2Tokenizer/__init__
class Speech2Text2Tokenizer:    def __init__(self, vocab_file, bos_token="<s>", pad_token="<pad>", eos_token="</s>", unk_token="<unk>", **kwargs):
        super().__init__(
            unk_token=unk_token,
            bos_token=bos_token,
            eos_token=eos_token,
            pad_token=pad_token,
            **kwargs,
        )

        with open(vocab_file, encoding="utf-8") as vocab_handle:
            self.encoder = json.load(vocab_handle)
        self.decoder = {v: k for k, v in self.encoder.items()}