change single_distiller head

paddleslim/dist/single_distiller.py

-#!/usr/bin/env python
-#-*- coding:utf8 -*-
-
-# ================================================================
-#   Copyright (C) 2019 BAIDU CORPORATION. All rights reserved.
-#   
-#   Filename  :       single_distiller.py
-#   Author    :       yangfukui@baidu.com
-#   Date      :       2019-11-01
-#   Describe  :       
+# Copyright (c) 2019  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 numpy as np
 import paddle.fluid as fluid