diff --git a/colossalai/nn/metric/accuracy_2p5d.py b/colossalai/nn/metric/accuracy_2p5d.py
index 337c6af4a..3044da065 100644
--- a/colossalai/nn/metric/accuracy_2p5d.py
+++ b/colossalai/nn/metric/accuracy_2p5d.py
@@ -8,6 +8,7 @@ from ._utils import calc_acc
 class Accuracy2p5D(nn.Module):
     """Accuracy for 2p5D parallelism
     """
+
     def __init__(self):
         super().__init__()