diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index bc8e3e8a3c55b89b8162f766f91fde13729fd23d..28cb700f82c3b5b7f42d65a3e94a8bd8681df70b 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -9179,6 +9179,7 @@ def psroi_pool(input,
         })
     return out
 
+
 def huber_regression_loss(input, label, delta):
     """
     Huber regression loss is a loss function used in robust regression.