code: def run_test_distributed(self, fn, device_option=None, **kwargs):
      comm_rank = os.getenv("COMM_RANK")
      self.assertIsNotNone(comm_rank)
      comm_size = os.getenv("COMM_SIZE")
      self.assertIsNotNone(comm_size)
      kwargs["comm_rank"] = int(comm_rank)
      kwargs["comm_size"] = int(comm_size)
      with core.DeviceScope(device_option):
          fn(**kwargs)
          workspace.ResetWorkspace()
  
imports: from hypothesis import given, settings
  import hypothesis.strategies
  from multiprocessing import Process, Queue
  import numpy
  import os
  import pickle
  import tempfile
  import shutil
  from caffe2.python import core, workspace, dyndep
  import caffe2.python.hypothesis_test_util
  from gloo.python import IoError
label_desc: Use image node_id 2 for calling the TestCase obj's underlying member method code with example usage: obj.run_test_distributed(fn, device_option) without return types