code: def test_net_multi_use(self):
      with Task() as task:
          total = ops.Const(0)
          net = Net("my_net")
          net.Add([total, net.Const(1)], [total])
          ops.net(net)
          ops.net(net)
          result = final_output(total)
      with LocalSession() as session:
          session.run(task)
          self.assertEqual(2, result.fetch())
  
imports: from caffe2.python import workspace
  from caffe2.python.core import Plan, to_execution_step, Net
  from caffe2.python.task import Task, TaskGroup, final_output
  from caffe2.python.net_builder import ops, NetBuilder
  from caffe2.python.session import LocalSession
  import unittest
  import threading
label_desc: Use image node_id 4 for calling the TestNetBuilder obj's underlying member method code with example usage: obj.test_net_multi_use() without return types