code: def test_torch_ipc():
      g = dgl.graph(([0, 1, 2], [1, 2, 3]))
      ctx = mp.get_context("spawn")
      p = ctx.Process(target=sub_ipc, args=(g,))
  
      p.start()
      p.join()
  
imports: import os
  import unittest
  import dgl
  import torch
  import torch.multiprocessing
label_desc: Use image node_id 2 for calling a global function with example usage: test_torch_ipc() without return types