code: def test_generator_func():
      device = torch.device("cpu")
      t0 = torch.randint(
          -(2**63),
          2**63 - 1,
          (1,),
          generator=crypten.generators["prev"][device],
      ).item()
      t1 = torch.randint(
          -(2**63),
          2**63 - 1,
          (1,),
          generator=crypten.generators["next"][device],
      ).item()
      return (t0, t1)
  
imports: import unittest
  import crypten
  import crypten.communicator
  import crypten.mpc
  import torch
  from crypten.config import cfg
label_desc: Use image node_id 4 for calling a global function with example usage: test_generator_func() and returns: t0,  t1