diff --git a/tools/cal_pos_neg.py b/tools/cal_pos_neg.py
index 8b356046f47b204f8709805a05a2cc0509a6d195..5fcc13a68ad415b8039ad868e42c73f81e28b40a 100644
--- a/tools/cal_pos_neg.py
+++ b/tools/cal_pos_neg.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.
+
 #!/usr/bin/python  
 #-*- coding:utf-8 -*-  
 ############################