diff --git a/colossalai/device/device_mesh.py b/colossalai/device/device_mesh.py
index 3e96310e1890..267c4529eb95 100644
--- a/colossalai/device/device_mesh.py
+++ b/colossalai/device/device_mesh.py
@@ -503,4 +503,4 @@ def all_to_all_cost(self, num_bytes, mesh_dim):
         num_devices = self.logical_mesh_id.shape[mesh_dim]
         penalty_factor = num_devices / 2.0
         return (self.mesh_alpha[mesh_dim] + self.mesh_beta[mesh_dim] *
-                (num_devices - 1) / num_devices / num_devices * num_bytes * penalty_factor + 0.001)
\ No newline at end of file
+                (num_devices - 1) / num_devices / num_devices * num_bytes * penalty_factor + 0.001)
diff --git a/colossalai/shardformer/layer/_operation.py b/colossalai/shardformer/layer/_operation.py
index c025daaeccc7..7e97bee01b33 100644
--- a/colossalai/shardformer/layer/_operation.py
+++ b/colossalai/shardformer/layer/_operation.py
@@ -287,4 +287,4 @@ def reduce_forward(input_, process_group):
 
 
 def reduce_backward(input_, process_group):
-    return _ReduceBackward.apply(input_, process_group)
\ No newline at end of file
+    return _ReduceBackward.apply(input_, process_group)
diff --git a/colossalai/shardformer/policies/autopolicy.py b/colossalai/shardformer/policies/autopolicy.py
index 8051433e8d71..085e3150c697 100644
--- a/colossalai/shardformer/policies/autopolicy.py
+++ b/colossalai/shardformer/policies/autopolicy.py
@@ -80,7 +80,7 @@ class PolicyLocation:
         PolicyLocation(file_name="opt", class_name="OPTForSequenceClassificationPolicy"),
     "transformers.models.opt.modeling_opt.OPTForQuestionAnswering":
         PolicyLocation(file_name="opt", class_name="OPTForQuestionAnsweringPolicy"),
-        
+
     # Bloom
     "transformers.models.bloom.modeling_bloom.BloomModel":
         PolicyLocation(file_name="bloom", class_name="BloomModelPolicy"),
diff --git a/tests/test_device/test_device_mesh.py b/tests/test_device/test_device_mesh.py
index 1f8db99c9236..590d6966bff6 100644
--- a/tests/test_device/test_device_mesh.py
+++ b/tests/test_device/test_device_mesh.py
@@ -86,4 +86,4 @@ def test_device_mesh_from_process_group():
 
 if __name__ == '__main__':
     test_device_mesh()
-    test_device_mesh_from_process_group()
\ No newline at end of file
+    test_device_mesh_from_process_group()
diff --git a/tests/test_shardformer/test_layer/test_layernorm.py b/tests/test_shardformer/test_layer/test_layernorm.py
index 080fae034956..a117845545be 100644
--- a/tests/test_shardformer/test_layer/test_layernorm.py
+++ b/tests/test_shardformer/test_layer/test_layernorm.py
@@ -41,4 +41,4 @@ def test_layernorm():
 
 
 if __name__ == '__main__':
-    test_layernorm_1d()
\ No newline at end of file
+    test_layernorm_1d()