code: def doc_to_text(self, doc):
      passage = " ".join(doc["sentences"])
      text = "Passage: " + passage + "\nQuestion: " + doc["question"]
      return self.detokenize(text)
  
imports: import numpy
  from lm_eval.base import rf, Task
  from lm_eval.metrics import mean
label_desc: Use image node_id 8 for calling the CBTBase obj's underlying member method code with example usage: obj.doc_to_text(doc) and returns: self