code: def doc_to_text(self, doc):
      return (
          "Title: "
          + doc["title"]
          + "\n\n"
          + "Background: "
          + doc["context"]
          + "\n\n"
          + "Question: "
          + doc["question"]
          + "\n\n"
          + "Answer:"
      )
  
imports: import datasets
  from math import exp
  from lm_eval.base import rf, Task
  from functools import partial
  from packaging import version
label_desc: Use image node_id 6 for calling the SQuAD2 obj's underlying member method code with example usage: obj.doc_to_text(doc) and returns: unknown