code: def validation_docs(self):
      raise NotImplementedError
  
file_path: lm-evaluation-harness/lm_eval/tasks/gsm8k.py
imports: import re
  from lm_eval.base import Task, rf
  from lm_eval.metrics import mean
label_desc: Use image node_id 5 for calling the GradeSchoolMath8K obj's underlying member method code with example usage: obj.validation_docs() without return types