code: def test_comm():
      spawn(check_layer, 4)
  
file_path: ColossalAI/tests/test_legacy/test_comm/test_comm.py
imports: import pytest
  import torch
  import torch.distributed
  from colossalai.legacy.communication import all_gather, all_reduce, reduce_scatter
  from colossalai.legacy.context import ParallelMode
  from colossalai.legacy.core import global_context
  from colossalai.legacy.initialize import launch
  from colossalai.testing import rerun_if_address_is_in_use, spawn
  from colossalai.utils import get_current_device
label_desc: Use image node_id 5 for calling a global function with example usage: test_comm() without return types