class_docstr: Test agents for distilling 'transformer/generator' models specifically.
code: def _download_model(self, datapath: str):
      download_blender(datapath)
  
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 for calling the TestTransformerDistillation obj's underlying member method code with example usage: obj._download_model(datapath) without return types