code: def testPool(self):
      ctx = multiprocessing.get_context()
      p = ctx.Pool(3)
      x = 1
      values = p.map(x.__add__, [3, 4, 5, 6, 6])
      self.assertEqual(values, [4, 5, 6, 7, 7])
  
file_path: agents/tf_agents/system/multiprocessing_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import pickle
  from tf_agents.system import system_multiprocessing
  from tf_agents.utils import test_utils
label_desc: Use image node_id 2 for calling the MultiprocessingTest obj's underlying member method code with example usage: obj.testPool() without return types