special_tokens_map.json

{
    "bos_token": "[CLS]",
    "cls_token": "[CLS]",
    "eos_token": "[SEP]",
    "mask_token": "[MASK]",
    "pad_token": "[PAD]",
    "sep_token": "[SEP]",
    "unk_token": {
        "content": "[UNK]",
        "lstrip": false,
        "normalized": true,
        "rstrip": false,
        "single_word": false
    }
}