code: def setup_data(self, datafile):
      for i in range(100):
          yield (str(i), str(i)), False
          yield (str(i), str(i)), True
  
file_path: ParlAI/tests/test_multiworld.py
imports: import unittest
  from parlai.core.agents import create_agent
  from parlai.core.params import ParlaiParser
  from parlai.core.worlds import create_task
  from parlai.core.teachers import DialogTeacher, register_teacher
  import parlai.utils.testing
label_desc: Use image node_id 2 for calling the Teacher1 obj's underlying member method code with example usage: obj.setup_data(datafile) without return types