special_tokens_map.json

{
  "additional_special_tokens": [
    {
      "content": "<ctc_blank>",
      "lstrip": false,
      "normalized": false,
      "rstrip": false,
      "single_word": false
    }
  ],
  "bos_token": "<s>",
  "eos_token": "</s>",
  "pad_token": "[PAD]",
  "unk_token": "[UNK]"
}