code: def num_examples(self):
      examples = 0
      for data in self.episodes:
          examples += len(data["qas"])
      return examples
  
file_path: ParlAI/parlai/tasks/dream/agents.py
imports: from parlai.core.teachers import FixedDialogTeacher
  from parlai.utils.io import PathManager
  from .build import build
  import os
  import json
label_desc: Use image node_id 5 for calling the DREAMTeacher obj's underlying member method code with example usage: obj.num_examples() and returns: examples