code: def __init__(self, opt, shared=None):
      opt["datafile"] = "filler"
      self.id = "teacher2"
      super().__init__(opt, shared)
  
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 1 to create a new Teacher2 object from inherited base classes: DialogTeacher with example: obj = Teacher2(opt, shared)