add reference (#4487)

ppdet/modeling/backbones/swin_transformer.py

@@ -11,6 +11,11 @@
 # 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.
+"""
+This code is based on https://github.com/microsoft/Swin-Transformer/blob/main/models/swin_transformer.py
+Ths copyright of microsoft/Swin-Transformer is as follows:
+MIT License [see LICENSE for details]
+"""
 
 import paddle
 import paddle.nn as nn

ppdet/modeling/heads/sparsercnn_head.py

@@ -11,6 +11,11 @@
 # 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.
+"""
+This code is based on https://github.com/PeizeSun/SparseR-CNN/blob/main/projects/SparseRCNN/sparsercnn/head.py
+Ths copyright of PeizeSun/SparseR-CNN is as follows:
+MIT License [see LICENSE for details]
+"""
 
 from __future__ import absolute_import
 from __future__ import division

ppdet/modeling/initializer.py

@@ -11,6 +11,10 @@
 # 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.
+"""
+This code is based on https://github.com/pytorch/pytorch/blob/master/torch/nn/init.py
+Ths copyright of pytorch/pytorch is a BSD-style license, as found in the LICENSE file.
+"""
 
 import math
 import numpy as np

ppdet/modeling/losses/sparsercnn_loss.py

@@ -11,6 +11,11 @@
 # 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.
+"""
+This code is based on https://github.com/PeizeSun/SparseR-CNN/blob/main/projects/SparseRCNN/sparsercnn/loss.py
+Ths copyright of PeizeSun/SparseR-CNN is as follows:
+MIT License [see LICENSE for details]
+"""
 
 from __future__ import absolute_import
 from __future__ import division