code: def _process_doc(self, doc):
      return doc["page"]
  
file_path: lm-evaluation-harness/lm_eval/tasks/wikitext.py
imports: import re
  from lm_eval.base import PerplexityTask
label_desc: Use image node_id 7 for calling the WikiText obj's underlying member method code with example usage: obj._process_doc(doc) and returns: doc