code: def run(self):
      return build_cands(self.opt)
  
file_path: ParlAI/parlai/scripts/build_candidates.py
imports: from parlai.core.params import ParlaiParser
  from parlai.agents.repeat_label.repeat_label import RepeatLabelAgent
  from parlai.core.worlds import create_task
  from parlai.utils.misc import TimeLogger
  import parlai.utils.logging
  from parlai.core.script import ParlaiScript, register_script
  import random
  import tempfile
label_desc: Use image node_id 2 for calling the BuildCandidates obj's underlying member method code with example usage: obj.run() and returns: build_cands