diff --git a/tests/test_booster/test_mixed_precision/test_fp16_torch.py b/tests/test_booster/test_mixed_precision/test_fp16_torch.py
index d98171a3d..bb76b354d 100644
--- a/tests/test_booster/test_mixed_precision/test_fp16_torch.py
+++ b/tests/test_booster/test_mixed_precision/test_fp16_torch.py
@@ -1,6 +1,6 @@
+import pytest
 import torch
 from torch.optim import Adam
-import pytest
 
 import colossalai
 from colossalai.booster.mixed_precision import FP16TorchMixedPrecision