code: def test_set_get(cls, create_store_handler_fn):
      # Queue for assertion errors on subprocesses
      queue = Queue()
  
      # Start N processes in the background
      num_procs = 4
      procs = []
      for index in range(num_procs):
          proc = Process(
              target=cls._test_set_get,
              args=(
                  queue,
                  create_store_handler_fn,
                  index,
                  num_procs,
              ),
          )
          proc.start()
          procs.append(proc)
  
      # Test complete, join background processes
      for proc in procs:
          proc.join()
  
      # Raise first error we find, if any
      if not queue.empty():
          raise queue.get()
  
imports: from multiprocessing import Process, Queue
  import numpy
  from caffe2.python import core, workspace
label_desc: Use image node_id 2 for calling the StoreOpsTests obj's underlying member method code with example usage: obj.test_set_get(cls, create_store_handler_fn) without return types