special_tokens_map.json

{
  "additional_special_tokens": [
    "<mask_1>"
  ],
  "cls_token": "[CLS]",
  "eos_token": "</s>",
  "mask_token": "<mask_2>",
  "pad_token": "<pad>",
  "sep_token": "[SEP]",
  "unk_token": "<unk>"
}