diff --git a/examples/cars/serving.py b/examples/cars/serving.py
index c1aef1d7..a08f4fc2 100644
--- a/examples/cars/serving.py
+++ b/examples/cars/serving.py
@@ -1,5 +1,6 @@
 """Prepare vectors for serving
 """
+
 import argparse
 import json
 import os
diff --git a/quaterion/loss/cos_face_loss.py b/quaterion/loss/cos_face_loss.py
index 4de05435..1f67b345 100644
--- a/quaterion/loss/cos_face_loss.py
+++ b/quaterion/loss/cos_face_loss.py
@@ -10,7 +10,6 @@
 
 
 class CosFaceLoss(GroupLoss):
-
     """Large Margin Cosine Loss as defined in https://arxiv.org/pdf/1801.09414.pdf
 
     Args: