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365
ppocr/modeling/backbones/table_master_resnet.py
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365
ppocr/modeling/backbones/table_master_resnet.py
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# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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This code is refer from:
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https://github.com/JiaquanYe/TableMASTER-mmocr/blob/master/mmocr/models/textrecog/backbones/table_resnet_extra.py
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"""
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import paddle
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import paddle.nn as nn
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import paddle.nn.functional as F
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class BasicBlock(nn.Layer):
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expansion = 1
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def __init__(self, inplanes, planes, stride=1, downsample=None, gcb_config=None):
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super(BasicBlock, self).__init__()
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self.conv1 = nn.Conv2D(
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inplanes, planes, kernel_size=3, stride=stride, padding=1, bias_attr=False
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)
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self.bn1 = nn.BatchNorm2D(planes, momentum=0.9)
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self.relu = nn.ReLU()
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self.conv2 = nn.Conv2D(
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planes, planes, kernel_size=3, stride=1, padding=1, bias_attr=False
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)
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self.bn2 = nn.BatchNorm2D(planes, momentum=0.9)
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self.downsample = downsample
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self.stride = stride
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self.gcb_config = gcb_config
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if self.gcb_config is not None:
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gcb_ratio = gcb_config["ratio"]
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gcb_headers = gcb_config["headers"]
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att_scale = gcb_config["att_scale"]
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fusion_type = gcb_config["fusion_type"]
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self.context_block = MultiAspectGCAttention(
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inplanes=planes,
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ratio=gcb_ratio,
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headers=gcb_headers,
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att_scale=att_scale,
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fusion_type=fusion_type,
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)
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def forward(self, x):
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residual = x
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out = self.conv1(x)
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out = self.bn1(out)
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out = self.relu(out)
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out = self.conv2(out)
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out = self.bn2(out)
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if self.gcb_config is not None:
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out = self.context_block(out)
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if self.downsample is not None:
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residual = self.downsample(x)
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out += residual
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out = self.relu(out)
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return out
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def get_gcb_config(gcb_config, layer):
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if gcb_config is None or not gcb_config["layers"][layer]:
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return None
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else:
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return gcb_config
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class TableResNetExtra(nn.Layer):
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def __init__(self, layers, in_channels=3, gcb_config=None):
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assert len(layers) >= 4
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super(TableResNetExtra, self).__init__()
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self.inplanes = 128
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self.conv1 = nn.Conv2D(
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in_channels, 64, kernel_size=3, stride=1, padding=1, bias_attr=False
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)
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self.bn1 = nn.BatchNorm2D(64)
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self.relu1 = nn.ReLU()
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self.conv2 = nn.Conv2D(
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64, 128, kernel_size=3, stride=1, padding=1, bias_attr=False
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)
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self.bn2 = nn.BatchNorm2D(128)
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self.relu2 = nn.ReLU()
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self.maxpool1 = nn.MaxPool2D(kernel_size=2, stride=2)
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self.layer1 = self._make_layer(
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BasicBlock,
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256,
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layers[0],
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stride=1,
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gcb_config=get_gcb_config(gcb_config, 0),
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)
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self.conv3 = nn.Conv2D(
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256, 256, kernel_size=3, stride=1, padding=1, bias_attr=False
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)
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self.bn3 = nn.BatchNorm2D(256)
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self.relu3 = nn.ReLU()
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self.maxpool2 = nn.MaxPool2D(kernel_size=2, stride=2)
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self.layer2 = self._make_layer(
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BasicBlock,
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256,
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layers[1],
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stride=1,
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gcb_config=get_gcb_config(gcb_config, 1),
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)
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self.conv4 = nn.Conv2D(
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256, 256, kernel_size=3, stride=1, padding=1, bias_attr=False
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)
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self.bn4 = nn.BatchNorm2D(256)
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self.relu4 = nn.ReLU()
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self.maxpool3 = nn.MaxPool2D(kernel_size=2, stride=2)
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self.layer3 = self._make_layer(
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BasicBlock,
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512,
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layers[2],
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stride=1,
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gcb_config=get_gcb_config(gcb_config, 2),
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)
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self.conv5 = nn.Conv2D(
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512, 512, kernel_size=3, stride=1, padding=1, bias_attr=False
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)
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self.bn5 = nn.BatchNorm2D(512)
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self.relu5 = nn.ReLU()
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self.layer4 = self._make_layer(
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BasicBlock,
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512,
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layers[3],
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stride=1,
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gcb_config=get_gcb_config(gcb_config, 3),
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)
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self.conv6 = nn.Conv2D(
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512, 512, kernel_size=3, stride=1, padding=1, bias_attr=False
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)
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self.bn6 = nn.BatchNorm2D(512)
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self.relu6 = nn.ReLU()
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self.out_channels = [256, 256, 512]
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def _make_layer(self, block, planes, blocks, stride=1, gcb_config=None):
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downsample = None
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if stride != 1 or self.inplanes != planes * block.expansion:
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downsample = nn.Sequential(
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nn.Conv2D(
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self.inplanes,
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planes * block.expansion,
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kernel_size=1,
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stride=stride,
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bias_attr=False,
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),
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nn.BatchNorm2D(planes * block.expansion),
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)
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layers = []
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layers.append(
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block(self.inplanes, planes, stride, downsample, gcb_config=gcb_config)
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)
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self.inplanes = planes * block.expansion
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for _ in range(1, blocks):
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layers.append(block(self.inplanes, planes))
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return nn.Sequential(*layers)
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def forward(self, x):
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f = []
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x = self.conv1(x)
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x = self.bn1(x)
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x = self.relu1(x)
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x = self.conv2(x)
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x = self.bn2(x)
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x = self.relu2(x)
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x = self.maxpool1(x)
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x = self.layer1(x)
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x = self.conv3(x)
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x = self.bn3(x)
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x = self.relu3(x)
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f.append(x)
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x = self.maxpool2(x)
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x = self.layer2(x)
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x = self.conv4(x)
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x = self.bn4(x)
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x = self.relu4(x)
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f.append(x)
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x = self.maxpool3(x)
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x = self.layer3(x)
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x = self.conv5(x)
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x = self.bn5(x)
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x = self.relu5(x)
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x = self.layer4(x)
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x = self.conv6(x)
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x = self.bn6(x)
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x = self.relu6(x)
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f.append(x)
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return f
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class MultiAspectGCAttention(nn.Layer):
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def __init__(
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self,
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inplanes,
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ratio,
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headers,
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pooling_type="att",
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att_scale=False,
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fusion_type="channel_add",
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):
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super(MultiAspectGCAttention, self).__init__()
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assert pooling_type in ["avg", "att"]
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assert fusion_type in ["channel_add", "channel_mul", "channel_concat"]
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assert (
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inplanes % headers == 0 and inplanes >= 8
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) # inplanes must be divided by headers evenly
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self.headers = headers
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self.inplanes = inplanes
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self.ratio = ratio
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self.planes = int(inplanes * ratio)
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self.pooling_type = pooling_type
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self.fusion_type = fusion_type
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self.att_scale = False
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self.single_header_inplanes = int(inplanes / headers)
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if pooling_type == "att":
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self.conv_mask = nn.Conv2D(self.single_header_inplanes, 1, kernel_size=1)
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self.softmax = nn.Softmax(axis=2)
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else:
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self.avg_pool = nn.AdaptiveAvgPool2D(1)
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if fusion_type == "channel_add":
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self.channel_add_conv = nn.Sequential(
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nn.Conv2D(self.inplanes, self.planes, kernel_size=1),
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nn.LayerNorm([self.planes, 1, 1]),
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nn.ReLU(),
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nn.Conv2D(self.planes, self.inplanes, kernel_size=1),
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)
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elif fusion_type == "channel_concat":
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self.channel_concat_conv = nn.Sequential(
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nn.Conv2D(self.inplanes, self.planes, kernel_size=1),
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nn.LayerNorm([self.planes, 1, 1]),
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nn.ReLU(),
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nn.Conv2D(self.planes, self.inplanes, kernel_size=1),
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)
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# for concat
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self.cat_conv = nn.Conv2D(2 * self.inplanes, self.inplanes, kernel_size=1)
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elif fusion_type == "channel_mul":
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self.channel_mul_conv = nn.Sequential(
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nn.Conv2D(self.inplanes, self.planes, kernel_size=1),
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nn.LayerNorm([self.planes, 1, 1]),
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nn.ReLU(),
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nn.Conv2D(self.planes, self.inplanes, kernel_size=1),
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)
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def spatial_pool(self, x):
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batch, channel, height, width = x.shape
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if self.pooling_type == "att":
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# [N*headers, C', H , W] C = headers * C'
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x = x.reshape(
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[batch * self.headers, self.single_header_inplanes, height, width]
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)
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input_x = x
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# [N*headers, C', H * W] C = headers * C'
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# input_x = input_x.view(batch, channel, height * width)
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input_x = input_x.reshape(
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[batch * self.headers, self.single_header_inplanes, height * width]
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)
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# [N*headers, 1, C', H * W]
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input_x = input_x.unsqueeze(1)
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# [N*headers, 1, H, W]
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context_mask = self.conv_mask(x)
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# [N*headers, 1, H * W]
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context_mask = context_mask.reshape(
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[batch * self.headers, 1, height * width]
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)
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# scale variance
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if self.att_scale and self.headers > 1:
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context_mask = context_mask / paddle.sqrt(self.single_header_inplanes)
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# [N*headers, 1, H * W]
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context_mask = self.softmax(context_mask)
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# [N*headers, 1, H * W, 1]
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context_mask = context_mask.unsqueeze(-1)
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# [N*headers, 1, C', 1] = [N*headers, 1, C', H * W] * [N*headers, 1, H * W, 1]
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context = paddle.matmul(input_x, context_mask)
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# [N, headers * C', 1, 1]
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context = context.reshape(
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[batch, self.headers * self.single_header_inplanes, 1, 1]
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)
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else:
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# [N, C, 1, 1]
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context = self.avg_pool(x)
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return context
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def forward(self, x):
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# [N, C, 1, 1]
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context = self.spatial_pool(x)
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out = x
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if self.fusion_type == "channel_mul":
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# [N, C, 1, 1]
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channel_mul_term = F.sigmoid(self.channel_mul_conv(context))
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out = out * channel_mul_term
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elif self.fusion_type == "channel_add":
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# [N, C, 1, 1]
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channel_add_term = self.channel_add_conv(context)
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out = out + channel_add_term
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else:
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# [N, C, 1, 1]
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channel_concat_term = self.channel_concat_conv(context)
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# use concat
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_, C1, _, _ = channel_concat_term.shape
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N, C2, H, W = out.shape
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out = paddle.concat(
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[out, channel_concat_term.expand([-1, -1, H, W])], axis=1
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)
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out = self.cat_conv(out)
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out = F.layer_norm(out, [self.inplanes, H, W])
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out = F.relu(out)
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return out
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