diff --git a/python/paddle/v2/fluid/__init__.py b/python/paddle/v2/fluid/__init__.py
index 032dd2683d8ea7d8fe8248a48b2ce7d9b93f1171..39d13d3ab5fb8340509e01b0bd1de6f66ce99c21 100644
--- a/python/paddle/v2/fluid/__init__.py
+++ b/python/paddle/v2/fluid/__init__.py
@@ -44,11 +44,27 @@ import unique_name
 Tensor = LoDTensor
 
 __all__ = framework.__all__ + executor.__all__ + concurrency.__all__ + [
-    'io', 'initializer', 'layers', 'nets', 'optimizer', 'learning_rate_decay',
-    'backward', 'regularizer', 'LoDTensor', 'CPUPlace', 'CUDAPlace', 'Tensor',
-    'ParamAttr', 'WeightNormParamAttr', 'DataFeeder', 'clip',
-    'SimpleDistributeTranspiler', 'DistributeTranspiler', 'memory_optimize',
-    'profiler', 'unique_name'
+    'io',
+    'initializer',
+    'layers',
+    'nets',
+    'optimizer',
+    'learning_rate_decay',
+    'backward',
+    'regularizer',
+    'LoDTensor',
+    'CPUPlace',
+    'CUDAPlace',
+    'Tensor',
+    'ParamAttr',
+    'WeightNormParamAttr',
+    'DataFeeder',
+    'clip',
+    'SimpleDistributeTranspiler',
+    'DistributeTranspiler',
+    'memory_optimize',
+    'profiler',
+    'unique_name',
 ]