class_docstr: This prompt version follows the Llama2-chat's prompt format:
  ```
  <s>[INST] <<SYS>>
  {{ system_prompt }}
  <</SYS>>
  
  {{ user_msg_1 }} [/INST] {{ model_answer_1 }} </s><s>[INST] {{ user_msg_2 }} [/INST]
  ```
  reference: https://huggingface.co/blog/llama2#how-to-prompt-llama-2
docstr: Insert the following prompt into `{{ user_msg }}`, which is based on prompt version 0.3
  ```
  与えられたニュース記事を要約してください。
  
  ニュース記事:{doc} [/INST]
  ```
docstr_tok: ["Insert","the","following","prompt","into","`","{","{","user_msg","}","}","`",",","which","is","based","on","prompt","version","0.3","``","`","\u4e0e\u3048\u3089\u308c\u305f\u30cb\u30e5\u30fc\u30b9\u8a18\u4e8b\u3092\u8981\u7d04\u3057\u3066\u304f\u3060\u3055\u3044\u3002","\u30cb\u30e5\u30fc\u30b9\u8a18\u4e8b",":","{","doc","}","[","\/INST","]","``","`"]
code: def doc_to_text(self, doc):
      """
      Insert the following prompt into `{{ user_msg }}`, which is based on prompt version 0.3
      ```
      与えられたニュース記事を要約してください。
  
      ニュース記事:{doc} [/INST]
      ```
      """
      input_text = f"ニュース記事:{doc['text']}"
      return f"{self.INSTRUCTION}\n\n{input_text} [/INST] "
  
imports: import os
  import inspect
  from lm_eval.utils import rouge2_mecab
  from lm_eval.base import rf, Task
label_desc: Use image node_id 1 for calling the XLSumJaWithLlama2 obj's underlying member method code with example usage: obj.doc_to_text(doc) and returns: self, str, input_text, str