code: def label_candidates(self):
      return self.cands
  
file_path: ParlAI/parlai/tasks/nlvr/agents.py
imports: from parlai.core.teachers import DialogTeacher
  from .build import build
  import json
  import os
  import glob
label_desc: Use image node_id 2 for calling the DefaultTeacher obj's underlying member method code with example usage: obj.label_candidates() and returns: self