diff --git a/transform/__init__.py b/transform/__init__.py
index 7986cdd642998fb0638a81c9ea22615faf8bad0b..78f618e617f4c1c94f95695e47c77509a28b7837 100644
--- a/transform/__init__.py
+++ b/transform/__init__.py
@@ -1 +1,15 @@
+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from .transforms import *
diff --git a/transform/functional.py b/transform/functional.py
index b5f6392a2e4ffd06e333ab805ed7e1e2aa5d25c2..8305619cc291a7f18c7258f1936fd9af684a967e 100644
--- a/transform/functional.py
+++ b/transform/functional.py
@@ -1,3 +1,17 @@
+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import sys
 import collections
 import random
diff --git a/transform/transforms.py b/transform/transforms.py
index 63dd52a9ceec9d1e78228b7524dc67ca49d87f58..47a5454e6a6a4ee18d239526defe9360d83ce8f0 100644
--- a/transform/transforms.py
+++ b/transform/transforms.py
@@ -1,3 +1,17 @@
+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from __future__ import division
 
 import math
@@ -14,10 +28,8 @@ import warnings
 from . import functional as F
 
 if sys.version_info < (3, 3):
-    Sequence = collections.Sequence
     Iterable = collections.Iterable
 else:
-    Sequence = collections.abc.Sequence
     Iterable = collections.abc.Iterable
 
 __all__ = [