// tokenizer_config.json
{
  "additional_special_tokens": [
    "ar_AR",
    "cs_CZ",
    "de_DE",
    "en_XX",
    "es_XX",
    "fr_XX",
    "zh_CN"
  ],
  "legacy": false,
  "model_max_length": 1024,
  "pad_token": "<pad>",
  "tokenizer_class": "MBart50TokenizerFast"
}