diff --git a/colossalai/nn/layer/base_layer.py b/colossalai/nn/layer/base_layer.py
index c85f53cc4..5234b6b1a 100644
--- a/colossalai/nn/layer/base_layer.py
+++ b/colossalai/nn/layer/base_layer.py
@@ -1,11 +1,12 @@
 #!/usr/bin/env python
 # -*- encoding: utf-8 -*-
 
+from contextlib import contextmanager
+
 import torch.nn as nn
 
 from colossalai.context import ParallelMode
 from colossalai.core import global_context as gpc
-from contextlib import contextmanager
 
 
 class ParallelLayer(nn.Module):
diff --git a/tests/test_device/test_device_mesh.py b/tests/test_device/test_device_mesh.py
index 3be057b3a..789ce8ab3 100644
--- a/tests/test_device/test_device_mesh.py
+++ b/tests/test_device/test_device_mesh.py
@@ -1,6 +1,7 @@
-from colossalai.device.device_mesh import DeviceMesh
 import torch
 
+from colossalai.device.device_mesh import DeviceMesh
+
 
 def test_device_mesh():
     physical_mesh_id = torch.arange(0, 16).reshape(2, 8)