def METHOD_NAME(self):
    super().METHOD_NAME()
    vocab = [
        "l",
        "o",
        "w",
        "e",
        "r",
        "s",
        "t",
        "i",
        "d",
        "n",
        "\u0120",
        "\u0120l",
        "\u0120n",
        "\u0120lo",
        "\u0120low",
        "er",
        "\u0120lowest",
        "\u0120newer",
        "\u0120wider",
        "<unk>",
        "<s>",
        "</s>",
        "<pad>",
        "<mask>",
    ]
    vocab_tokens = dict(zip(vocab, range(len(vocab))))
    merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
    self.special_tokens_map = {
        "bos_token": "<s>",
        "eos_token": "</s>",
        "cls_token": "<s>",
        "sep_token": "</s>",
        "unk_token": "<unk>",
        "pad_token": "<pad>",
        "mask_token": "<mask>",
    }
    self.vocab_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["vocab_file"])
    self.merges_file = os.path.join(self.tmpdirname, VOCAB_FILES_NAMES["merges_file"])
    with open(self.vocab_file, "w", encoding="utf-8") as fp:
        fp.write(json.dumps(vocab_tokens) + "\n")
    with open(self.merges_file, "w", encoding="utf-8") as fp:
        fp.write("\n".join(merges))