code: def test_world_size(self) -> None:
      ones = test_worldsize_func()
      self.assertEqual(ones, [1] * 10)
  
imports: import unittest
  import crypten
  import crypten.communicator
  import crypten.mpc
  import torch
  from crypten.config import cfg
label_desc: Use image node_id 3 for calling the TestContext obj's underlying member method code with example usage: obj.test_world_size() without return types