code: def __init__(self, opt, shared=None):
      self.datatype = opt["datatype"]
      data_path, self.images_path = _path(opt)
      opt["datafile"] = data_path
      self.id = "nlvr"
      self.dt = opt["datatype"].split(":")[0]
      if self.dt == "valid":
          self.dt = "dev"
  
      super().__init__(opt, shared)
  
file_path: ParlAI/parlai/tasks/nlvr/agents.py
imports: from parlai.core.teachers import DialogTeacher
  from .build import build
  import json
  import os
  import glob
label_desc: Use image node_id 1 to create a new DefaultTeacher object from inherited base classes: DialogTeacher with example: obj = DefaultTeacher(opt, shared)