code: def test_mlp_layer():
      spawn(check_act_ckpt, 4)
  
file_path: ColossalAI/tests/test_auto_parallel/test_tensor_shard/test_checkpoint.py
imports: from typing import Optional, Tuple
  import pytest
  import torch
  import torch.nn
  from torch.utils.checkpoint import checkpoint
  from transformers.pytorch_utils import Conv1D
  from colossalai.device.device_mesh import DeviceMesh
  from colossalai.initialize import launch
  from colossalai.logging import disable_existing_loggers
  from colossalai.testing import rerun_if_address_is_in_use, run_on_environment_flag, spawn
label_desc: Use image node_id 2 for calling a global function with example usage: test_mlp_layer() without return types