class_docstr: Teacher agent that returns one fixed message.
code: def __init__(self, opt, shared=None):
      opt["datafile"] = DatatypeHelper.fold(opt["datatype"])
      self.id = FIXED_MESSAGE_TASK
      super().__init__(opt, shared)
  
imports: import random
  from abc import ABC, abstractmethod
  from math import floor, log10
  from typing import Dict
  import numpy
  import pytest
  import torch
  from pytest_regressions.data_regression import DataRegressionFixture
  import parlai.utils.testing
  from parlai.core.opt import Opt
  from parlai.core.teachers import register_teacher, DialogTeacher
  from parlai.utils.data import DatatypeHelper
  from parlai.zoo.bart.build import download
  from parlai.zoo.blender.blender_90M import download
label_desc: Use image node_id 1 to create a new FixedMessageTeacher object from inherited base classes: DialogTeacher with example: obj = FixedMessageTeacher(opt, shared)