diff --git a/python/paddle/fluid/dataset.py b/python/paddle/fluid/dataset.py
index 25127bc76476bee3310869a494b9c2e991ef4773..9e899a2a6cf217c1ba0848ad8648581530b449cf 100644
--- a/python/paddle/fluid/dataset.py
+++ b/python/paddle/fluid/dataset.py
@@ -275,6 +275,7 @@ class InMemoryDataset(DatasetBase):
         """
         self.dataset.release_memory()
 
+
 class QueueDataset(DatasetBase):
     """
     QueueDataset, it will process data streamly.