code: def test_process_group_mesh():
      spawn(run_dist, 4)
  
file_path: ColossalAI/tests/test_cluster/test_process_group_mesh.py
imports: import pytest
  import torch.distributed
  import colossalai
  from colossalai.cluster import ProcessGroupMesh
  from colossalai.testing import spawn
label_desc: Use image node_id 4 for calling a global function with example usage: test_process_group_mesh() without return types