diff --git a/ppocr/data/imaug/iaa_augment.py b/ppocr/data/imaug/iaa_augment.py
index 9ce6bd4209034389df04334a83717142ca8c7b40..e9a1fa0637bfecfb797a35d58abe5cbf38688679 100644
--- a/ppocr/data/imaug/iaa_augment.py
+++ b/ppocr/data/imaug/iaa_augment.py
@@ -1,16 +1,7 @@
-# copyright (c) 2020 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.
+"""
+This code is refer from:
+https://github.com/WenmuZhou/DBNet.pytorch/blob/master/data_loader/modules/iaa_augment.py
+"""
 from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
diff --git a/ppocr/data/imaug/make_border_map.py b/ppocr/data/imaug/make_border_map.py
index cc2c9034e147eb7bb6a70e43eda4903337a523f0..44110ff3bb82eac0a56a941d5d181dbfb0502a01 100644
--- a/ppocr/data/imaug/make_border_map.py
+++ b/ppocr/data/imaug/make_border_map.py
@@ -1,4 +1,8 @@
 # -*- coding:utf-8 -*- 
+"""
+This code is refer from:
+https://github.com/WenmuZhou/DBNet.pytorch/blob/master/data_loader/modules/make_border_map.py
+"""
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/ppocr/data/imaug/make_pse_gt.py b/ppocr/data/imaug/make_pse_gt.py
index 55abc8970784fd00843d2e91f259c58b65ae8579..d1e2b1c5ed709d0e3e17c392c80174b70d5dd2f2 100644
--- a/ppocr/data/imaug/make_pse_gt.py
+++ b/ppocr/data/imaug/make_pse_gt.py
@@ -12,6 +12,7 @@ from shapely.geometry import Polygon
 
 __all__ = ['MakePseGt']
 
+
 class MakePseGt(object):
     r'''
     Making binary mask from detection data with ICDAR format.
@@ -38,16 +39,20 @@ class MakePseGt(object):
             text_polys *= scale
 
         gt_kernels = []
-        for i in range(1,self.kernel_num+1):
+        for i in range(1, self.kernel_num + 1):
             # s1->sn, from big to small
-            rate = 1.0 - (1.0 - self.min_shrink_ratio) / (self.kernel_num - 1) * i
-            text_kernel, ignore_tags = self.generate_kernel(image.shape[0:2], rate, text_polys, ignore_tags)
+            rate = 1.0 - (1.0 - self.min_shrink_ratio) / (self.kernel_num - 1
+                                                          ) * i
+            text_kernel, ignore_tags = self.generate_kernel(
+                image.shape[0:2], rate, text_polys, ignore_tags)
             gt_kernels.append(text_kernel)
 
         training_mask = np.ones(image.shape[0:2], dtype='uint8')
         for i in range(text_polys.shape[0]):
             if ignore_tags[i]:
-                cv2.fillPoly(training_mask, text_polys[i].astype(np.int32)[np.newaxis, :, :], 0)
+                cv2.fillPoly(training_mask,
+                             text_polys[i].astype(np.int32)[np.newaxis, :, :],
+                             0)
 
         gt_kernels = np.array(gt_kernels)
         gt_kernels[gt_kernels > 0] = 1
@@ -59,16 +64,25 @@ class MakePseGt(object):
         data['mask'] = training_mask.astype('float32')
         return data
 
-    def generate_kernel(self, img_size, shrink_ratio, text_polys, ignore_tags=None):
+    def generate_kernel(self,
+                        img_size,
+                        shrink_ratio,
+                        text_polys,
+                        ignore_tags=None):
+        """
+        Refer to part of the code:
+        https://github.com/open-mmlab/mmocr/blob/main/mmocr/datasets/pipelines/textdet_targets/base_textdet_targets.py
+        """
+
         h, w = img_size
         text_kernel = np.zeros((h, w), dtype=np.float32)
         for i, poly in enumerate(text_polys):
             polygon = Polygon(poly)
-            distance = polygon.area * (1 - shrink_ratio * shrink_ratio) / (polygon.length + 1e-6)
+            distance = polygon.area * (1 - shrink_ratio * shrink_ratio) / (
+                polygon.length + 1e-6)
             subject = [tuple(l) for l in poly]
             pco = pyclipper.PyclipperOffset()
-            pco.AddPath(subject, pyclipper.JT_ROUND,
-                        pyclipper.ET_CLOSEDPOLYGON)
+            pco.AddPath(subject, pyclipper.JT_ROUND, pyclipper.ET_CLOSEDPOLYGON)
             shrinked = np.array(pco.Execute(-distance))
 
             if len(shrinked) == 0 or shrinked.size == 0:
diff --git a/ppocr/data/imaug/make_shrink_map.py b/ppocr/data/imaug/make_shrink_map.py
index 15e8afa05bb9f7315a2e9342c78cb98718a54df9..78171268fb30dfb9394697cf53cd5196818cf06f 100644
--- a/ppocr/data/imaug/make_shrink_map.py
+++ b/ppocr/data/imaug/make_shrink_map.py
@@ -1,4 +1,8 @@
 # -*- coding:utf-8 -*- 
+"""
+This code is refer from:
+https://github.com/WenmuZhou/DBNet.pytorch/blob/master/data_loader/modules/make_shrink_map.py
+"""
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/ppocr/data/imaug/random_crop_data.py b/ppocr/data/imaug/random_crop_data.py
index 7c1c25abb56a0cf7d4d59b8523962bd5d81c873a..507695ff0fa92789b921310079eb8b471a1e275d 100644
--- a/ppocr/data/imaug/random_crop_data.py
+++ b/ppocr/data/imaug/random_crop_data.py
@@ -1,4 +1,8 @@
 # -*- coding:utf-8 -*- 
+"""
+This code is refer from:
+https://github.com/WenmuZhou/DBNet.pytorch/blob/master/data_loader/modules/random_crop_data.py
+"""
 
 from __future__ import absolute_import
 from __future__ import division
diff --git a/ppocr/data/imaug/text_image_aug/augment.py b/ppocr/data/imaug/text_image_aug/augment.py
index 1aeff3733a4521c56dd5972fc058f6e0c245e4b7..eb2c7f129d785e4cb88cb9f356dc09cebc23fc71 100644
--- a/ppocr/data/imaug/text_image_aug/augment.py
+++ b/ppocr/data/imaug/text_image_aug/augment.py
@@ -1,16 +1,7 @@
-# copyright (c) 2020 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.
+"""
+This code is refer from:
+https://github.com/RubanSeven/Text-Image-Augmentation-python/blob/master/augment.py
+"""
 
 import numpy as np
 from .warp_mls import WarpMLS
diff --git a/ppocr/data/imaug/text_image_aug/warp_mls.py b/ppocr/data/imaug/text_image_aug/warp_mls.py
index d6cbe749b61aa4cf3163927c096868c83f4a4cdd..e6ab7337ffe4d511a5b9f5b1d045b0fe21bc7924 100644
--- a/ppocr/data/imaug/text_image_aug/warp_mls.py
+++ b/ppocr/data/imaug/text_image_aug/warp_mls.py
@@ -1,16 +1,7 @@
-# copyright (c) 2020 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.
+"""
+This code is refer from:
+https://github.com/RubanSeven/Text-Image-Augmentation-python/blob/master/warp_mls.py
+"""
 
 import numpy as np
 
diff --git a/ppocr/losses/det_pse_loss.py b/ppocr/losses/det_pse_loss.py
index 78423091f841f29b1217f73f79beb26fe1575844..6beea8d8bee9f54d886eb0236bdf34e4a599053c 100644
--- a/ppocr/losses/det_pse_loss.py
+++ b/ppocr/losses/det_pse_loss.py
@@ -1,16 +1,7 @@
-# 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.
+"""
+This code is refer from:
+https://github.com/whai362/PSENet/blob/python3/models/head/psenet_head.py
+"""
 
 import paddle
 from paddle import nn
diff --git a/ppocr/modeling/heads/det_pse_head.py b/ppocr/modeling/heads/det_pse_head.py
index db800f57a216ab437b724988ce692a9ac0c545d9..9ac1e79532760b267cb4d6f2ca72e9cdd555cdcb 100644
--- a/ppocr/modeling/heads/det_pse_head.py
+++ b/ppocr/modeling/heads/det_pse_head.py
@@ -1,32 +1,21 @@
-# copyright (c) 2020 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.
+"""
+This code is refer from:
+https://github.com/whai362/PSENet/blob/python3/models/head/psenet_head.py
+"""
+
 from paddle import nn
 
 
 class PSEHead(nn.Layer):
-    def __init__(self,
-                 in_channels,
-                 hidden_dim=256,
-                 out_channels=7,
-                 **kwargs):
+    def __init__(self, in_channels, hidden_dim=256, out_channels=7, **kwargs):
         super(PSEHead, self).__init__()
-        self.conv1 = nn.Conv2D(in_channels, hidden_dim, kernel_size=3, stride=1, padding=1)
+        self.conv1 = nn.Conv2D(
+            in_channels, hidden_dim, kernel_size=3, stride=1, padding=1)
         self.bn1 = nn.BatchNorm2D(hidden_dim)
         self.relu1 = nn.ReLU()
 
-        self.conv2 = nn.Conv2D(hidden_dim, out_channels, kernel_size=1, stride=1, padding=0)
-
+        self.conv2 = nn.Conv2D(
+            hidden_dim, out_channels, kernel_size=1, stride=1, padding=0)
 
     def forward(self, x, **kwargs):
         out = self.conv1(x)
diff --git a/ppocr/modeling/necks/fpn.py b/ppocr/modeling/necks/fpn.py
index 8728a5c9ded5b9c174fd34f088d8012961f65ec0..9d69a4c17d2a7099ac2c446e13b448c21d33a100 100644
--- a/ppocr/modeling/necks/fpn.py
+++ b/ppocr/modeling/necks/fpn.py
@@ -1,74 +1,99 @@
-# 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.
+"""
+This code is refer from:
+https://github.com/whai362/PSENet/blob/python3/models/neck/fpn.py
+"""
 
 import paddle.nn as nn
 import paddle
 import math
 import paddle.nn.functional as F
 
+
 class Conv_BN_ReLU(nn.Layer):
-    def __init__(self, in_planes, out_planes, kernel_size=1, stride=1, padding=0):
+    def __init__(self,
+                 in_planes,
+                 out_planes,
+                 kernel_size=1,
+                 stride=1,
+                 padding=0):
         super(Conv_BN_ReLU, self).__init__()
-        self.conv = nn.Conv2D(in_planes, out_planes, kernel_size=kernel_size, stride=stride, padding=padding,
-                              bias_attr=False)
+        self.conv = nn.Conv2D(
+            in_planes,
+            out_planes,
+            kernel_size=kernel_size,
+            stride=stride,
+            padding=padding,
+            bias_attr=False)
         self.bn = nn.BatchNorm2D(out_planes, momentum=0.1)
         self.relu = nn.ReLU()
 
         for m in self.sublayers():
             if isinstance(m, nn.Conv2D):
                 n = m._kernel_size[0] * m._kernel_size[1] * m._out_channels
-                m.weight = paddle.create_parameter(shape=m.weight.shape, dtype='float32', default_initializer=paddle.nn.initializer.Normal(0, math.sqrt(2. / n)))
+                m.weight = paddle.create_parameter(
+                    shape=m.weight.shape,
+                    dtype='float32',
+                    default_initializer=paddle.nn.initializer.Normal(
+                        0, math.sqrt(2. / n)))
             elif isinstance(m, nn.BatchNorm2D):
-                m.weight = paddle.create_parameter(shape=m.weight.shape, dtype='float32', default_initializer=paddle.nn.initializer.Constant(1.0))
-                m.bias = paddle.create_parameter(shape=m.bias.shape, dtype='float32', default_initializer=paddle.nn.initializer.Constant(0.0))
+                m.weight = paddle.create_parameter(
+                    shape=m.weight.shape,
+                    dtype='float32',
+                    default_initializer=paddle.nn.initializer.Constant(1.0))
+                m.bias = paddle.create_parameter(
+                    shape=m.bias.shape,
+                    dtype='float32',
+                    default_initializer=paddle.nn.initializer.Constant(0.0))
 
     def forward(self, x):
         return self.relu(self.bn(self.conv(x)))
 
+
 class FPN(nn.Layer):
     def __init__(self, in_channels, out_channels):
         super(FPN, self).__init__()
 
         # Top layer
-        self.toplayer_ = Conv_BN_ReLU(in_channels[3], out_channels, kernel_size=1, stride=1, padding=0)
+        self.toplayer_ = Conv_BN_ReLU(
+            in_channels[3], out_channels, kernel_size=1, stride=1, padding=0)
         # Lateral layers
-        self.latlayer1_ = Conv_BN_ReLU(in_channels[2], out_channels, kernel_size=1, stride=1, padding=0)
+        self.latlayer1_ = Conv_BN_ReLU(
+            in_channels[2], out_channels, kernel_size=1, stride=1, padding=0)
 
-        self.latlayer2_ = Conv_BN_ReLU(in_channels[1], out_channels, kernel_size=1, stride=1, padding=0)
+        self.latlayer2_ = Conv_BN_ReLU(
+            in_channels[1], out_channels, kernel_size=1, stride=1, padding=0)
 
-        self.latlayer3_ = Conv_BN_ReLU(in_channels[0], out_channels, kernel_size=1, stride=1, padding=0)
+        self.latlayer3_ = Conv_BN_ReLU(
+            in_channels[0], out_channels, kernel_size=1, stride=1, padding=0)
 
         # Smooth layers
-        self.smooth1_ = Conv_BN_ReLU(out_channels, out_channels, kernel_size=3, stride=1, padding=1)
-
-        self.smooth2_ = Conv_BN_ReLU(out_channels, out_channels, kernel_size=3, stride=1, padding=1)
+        self.smooth1_ = Conv_BN_ReLU(
+            out_channels, out_channels, kernel_size=3, stride=1, padding=1)
 
-        self.smooth3_ = Conv_BN_ReLU(out_channels, out_channels, kernel_size=3, stride=1, padding=1)
+        self.smooth2_ = Conv_BN_ReLU(
+            out_channels, out_channels, kernel_size=3, stride=1, padding=1)
 
+        self.smooth3_ = Conv_BN_ReLU(
+            out_channels, out_channels, kernel_size=3, stride=1, padding=1)
 
         self.out_channels = out_channels * 4
         for m in self.sublayers():
             if isinstance(m, nn.Conv2D):
                 n = m._kernel_size[0] * m._kernel_size[1] * m._out_channels
-                m.weight = paddle.create_parameter(shape=m.weight.shape, dtype='float32',
-                                                   default_initializer=paddle.nn.initializer.Normal(0,
-                                                                                                    math.sqrt(2. / n)))
+                m.weight = paddle.create_parameter(
+                    shape=m.weight.shape,
+                    dtype='float32',
+                    default_initializer=paddle.nn.initializer.Normal(
+                        0, math.sqrt(2. / n)))
             elif isinstance(m, nn.BatchNorm2D):
-                m.weight = paddle.create_parameter(shape=m.weight.shape, dtype='float32',
-                                                   default_initializer=paddle.nn.initializer.Constant(1.0))
-                m.bias = paddle.create_parameter(shape=m.bias.shape, dtype='float32',
-                                                 default_initializer=paddle.nn.initializer.Constant(0.0))
+                m.weight = paddle.create_parameter(
+                    shape=m.weight.shape,
+                    dtype='float32',
+                    default_initializer=paddle.nn.initializer.Constant(1.0))
+                m.bias = paddle.create_parameter(
+                    shape=m.bias.shape,
+                    dtype='float32',
+                    default_initializer=paddle.nn.initializer.Constant(0.0))
 
     def _upsample(self, x, scale=1):
         return F.upsample(x, scale_factor=scale, mode='bilinear')
@@ -81,15 +106,15 @@ class FPN(nn.Layer):
         p5 = self.toplayer_(f5)
 
         f4 = self.latlayer1_(f4)
-        p4 = self._upsample_add(p5, f4,2)
+        p4 = self._upsample_add(p5, f4, 2)
         p4 = self.smooth1_(p4)
 
         f3 = self.latlayer2_(f3)
-        p3 = self._upsample_add(p4, f3,2)
+        p3 = self._upsample_add(p4, f3, 2)
         p3 = self.smooth2_(p3)
 
         f2 = self.latlayer3_(f2)
-        p2 = self._upsample_add(p3, f2,2)
+        p2 = self._upsample_add(p3, f2, 2)
         p2 = self.smooth3_(p2)
 
         p3 = self._upsample(p3, 2)
@@ -97,4 +122,4 @@ class FPN(nn.Layer):
         p5 = self._upsample(p5, 8)
 
         fuse = paddle.concat([p2, p3, p4, p5], axis=1)
-        return fuse
\ No newline at end of file
+        return fuse
diff --git a/ppocr/postprocess/pse_postprocess/pse/README.md b/ppocr/postprocess/pse_postprocess/pse/README.md
index 9c2d9eaeaa5f93550358ebdd4d9161330b78a86f..6a19d5d1b6b1d8e6952eb054d74c6672ed10bc48 100644
--- a/ppocr/postprocess/pse_postprocess/pse/README.md
+++ b/ppocr/postprocess/pse_postprocess/pse/README.md
@@ -1,5 +1,6 @@
 ## 编译
-code from https://github.com/whai362/pan_pp.pytorch
+This code is refer from:
+https://github.com/whai362/PSENet/blob/python3/models/post_processing/pse
 ```python
 python3 setup.py build_ext --inplace
 ```
diff --git a/ppocr/postprocess/pse_postprocess/pse_postprocess.py b/ppocr/postprocess/pse_postprocess/pse_postprocess.py
index 4b89d221d284602933ab3d4f21468fcae79ef310..d86af2e5b1e910fd4f9b7323c9be4e676aa9462b 100755
--- a/ppocr/postprocess/pse_postprocess/pse_postprocess.py
+++ b/ppocr/postprocess/pse_postprocess/pse_postprocess.py
@@ -1,16 +1,7 @@
-# Copyright (c) 2021 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.
+"""
+This code is refer from:
+https://github.com/whai362/PSENet/blob/python3/models/head/psenet_head.py
+"""
 
 from __future__ import absolute_import
 from __future__ import division
@@ -47,7 +38,8 @@ class PSEPostProcess(object):
         pred = outs_dict['maps']
         if not isinstance(pred, paddle.Tensor):
             pred = paddle.to_tensor(pred)
-        pred = F.interpolate(pred, scale_factor=4 // self.scale, mode='bilinear')
+        pred = F.interpolate(
+            pred, scale_factor=4 // self.scale, mode='bilinear')
 
         score = F.sigmoid(pred[:, 0, :, :])
 
@@ -60,7 +52,9 @@ class PSEPostProcess(object):
 
         boxes_batch = []
         for batch_index in range(pred.shape[0]):
-            boxes, scores = self.boxes_from_bitmap(score[batch_index], kernels[batch_index], shape_list[batch_index])
+            boxes, scores = self.boxes_from_bitmap(score[batch_index],
+                                                   kernels[batch_index],
+                                                   shape_list[batch_index])
 
             boxes_batch.append({'points': boxes, 'scores': scores})
         return boxes_batch
@@ -98,15 +92,14 @@ class PSEPostProcess(object):
                 mask = np.zeros((box_height, box_width), np.uint8)
                 mask[points[:, 1], points[:, 0]] = 255
 
-                contours, _ = cv2.findContours(mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
+                contours, _ = cv2.findContours(mask, cv2.RETR_EXTERNAL,
+                                               cv2.CHAIN_APPROX_SIMPLE)
                 bbox = np.squeeze(contours[0], 1)
             else:
                 raise NotImplementedError
 
-            bbox[:, 0] = np.clip(
-                np.round(bbox[:, 0] / ratio_w), 0, src_w)
-            bbox[:, 1] = np.clip(
-                np.round(bbox[:, 1] / ratio_h), 0, src_h)
+            bbox[:, 0] = np.clip(np.round(bbox[:, 0] / ratio_w), 0, src_w)
+            bbox[:, 1] = np.clip(np.round(bbox[:, 1] / ratio_h), 0, src_h)
             boxes.append(bbox)
             scores.append(score_i)
         return boxes, scores
diff --git a/ppocr/utils/iou.py b/ppocr/utils/iou.py
index 20529dee2d14083f3de4ac034668d004136c56e2..80d15df0fdb127399af112d842b632927a7bccea 100644
--- a/ppocr/utils/iou.py
+++ b/ppocr/utils/iou.py
@@ -1,28 +1,20 @@
-# copyright (c) 2020 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.
+"""
+This code is refer from:
+https://github.com/whai362/PSENet/blob/python3/models/loss/iou.py
+"""
 
 import paddle
 
 EPS = 1e-6
 
+
 def iou_single(a, b, mask, n_class):
     valid = mask == 1
     a = a.masked_select(valid)
     b = b.masked_select(valid)
     miou = []
     for i in range(n_class):
-        if a.shape == [0] and a.shape==b.shape:
+        if a.shape == [0] and a.shape == b.shape:
             inter = paddle.to_tensor(0.0)
             union = paddle.to_tensor(0.0)
         else:
@@ -32,6 +24,7 @@ def iou_single(a, b, mask, n_class):
     miou = sum(miou) / len(miou)
     return miou
 
+
 def iou(a, b, mask, n_class=2, reduce=True):
     batch_size = a.shape[0]
 
@@ -39,10 +32,10 @@ def iou(a, b, mask, n_class=2, reduce=True):
     b = b.reshape([batch_size, -1])
     mask = mask.reshape([batch_size, -1])
 
-    iou = paddle.zeros((batch_size,), dtype='float32')
+    iou = paddle.zeros((batch_size, ), dtype='float32')
     for i in range(batch_size):
         iou[i] = iou_single(a[i], b[i], mask[i], n_class)
 
     if reduce:
         iou = paddle.mean(iou)
-    return iou
\ No newline at end of file
+    return iou
diff --git a/ppocr/utils/logging.py b/ppocr/utils/logging.py
index 11896c37d9285e19a9526caa9c637d7eda7b1979..e30eee68024c5c5f4c549519f087a421e87ce65d 100644
--- a/ppocr/utils/logging.py
+++ b/ppocr/utils/logging.py
@@ -1,16 +1,7 @@
-# Copyright (c) 2020 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.
+"""
+This code is refer from:
+https://github.com/WenmuZhou/PytorchOCR/blob/master/torchocr/utils/logging.py
+"""
 
 import os
 import sys