code: def synchronize(self, store_handler, value, comm_rank=None):
      TestCase.sync_counter += 1
      blob = "sync_{}".format(TestCase.sync_counter)
      if comm_rank == 0:
          workspace.FeedBlob(blob, pickle.dumps(value))
          workspace.RunOperatorOnce(
              core.CreateOperator("StoreSet", [store_handler, blob], [])
          )
      else:
          workspace.RunOperatorOnce(
              core.CreateOperator("StoreGet", [store_handler], [blob])
          )
      return pickle.loads(workspace.FetchBlob(blob))
  
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 4 for calling the TestCase obj's underlying member method code with example usage: obj.synchronize(store_handler, value, comm_rank) and returns: pickle