code: def test_multi_device_bn_op_level_gpu(self, seed, batch_size):
      self._bn_check_op_level("gpu", seed, batch_size)
  
imports: from multiprocessing import Process, Queue
  import numpy
  import os
  import shutil
  import tempfile
  import unittest
  import time
  from unittest.mock import Mock
  from hypothesis import assume, given, settings
  import hypothesis.strategies
  from caffe2.proto import caffe2_pb2
  from caffe2.python import brew, core, cnn, data_parallel_model, dyndep, model_helper, optimizer, rnn_cell, workspace
  from caffe2.python.test_util import TestCase
label_desc: Use image node_id 11 for calling the DataParallelModelTest obj's underlying member method code with example usage: obj.test_multi_device_bn_op_level_gpu(seed, batch_size) without return types