code: def __init__(self, opt, shared=None):
      nli_tasks = [
          "anli:r1",
          "anli:r2",
          "anli:r3",
          "multinli",
          "snli",
          "dialogue_nli",
      ]
      opt = deepcopy(opt)
      opt["task"] = ",".join(nli_tasks)
      super().__init__(opt, shared)
  
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.teachers import MultiTaskTeacher
  import parlai.tasks.anli.agents
  import parlai.tasks.multinli.agents
  import parlai.tasks.snli.agents
  import parlai.tasks.dialogue_nli.agents
  from copy import deepcopy
label_desc: Use image node_id 2 to create a new NliTeacher object from inherited base classes: MultiTaskTeacher with example: obj = NliTeacher(opt, shared)