[Improvement] Add the SegFormer license

paddleseg/models/segformer.py

@@ -1,16 +1,6 @@
-# copyright (c) 2021 PaddlePaddle Authors. All Rights Reserve.
-#
-# 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.
+# The SegFormer code was heavily based on https://github.com/NVlabs/SegFormer
+# Users should be careful about adopting these functions in any commercial matters.
+# https://github.com/NVlabs/SegFormer#license
 
 import paddle
 import paddle.nn as nn