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YaoFANGUK
284
backend/ppocr/modeling/necks/sast_fpn.py
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284
backend/ppocr/modeling/necks/sast_fpn.py
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# copyright (c) 2019 PaddlePaddle Authors. All Rights Reserve.
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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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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import paddle
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from paddle import nn
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import paddle.nn.functional as F
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from paddle import ParamAttr
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class ConvBNLayer(nn.Layer):
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def __init__(self,
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in_channels,
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out_channels,
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kernel_size,
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stride,
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groups=1,
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if_act=True,
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act=None,
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name=None):
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super(ConvBNLayer, self).__init__()
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self.if_act = if_act
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self.act = act
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self.conv = nn.Conv2D(
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in_channels=in_channels,
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out_channels=out_channels,
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kernel_size=kernel_size,
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stride=stride,
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padding=(kernel_size - 1) // 2,
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groups=groups,
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weight_attr=ParamAttr(name=name + '_weights'),
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bias_attr=False)
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self.bn = nn.BatchNorm(
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num_channels=out_channels,
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act=act,
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param_attr=ParamAttr(name="bn_" + name + "_scale"),
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bias_attr=ParamAttr(name="bn_" + name + "_offset"),
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moving_mean_name="bn_" + name + "_mean",
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moving_variance_name="bn_" + name + "_variance")
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def forward(self, x):
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x = self.conv(x)
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x = self.bn(x)
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return x
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class DeConvBNLayer(nn.Layer):
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def __init__(self,
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in_channels,
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out_channels,
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kernel_size,
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stride,
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groups=1,
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if_act=True,
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act=None,
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name=None):
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super(DeConvBNLayer, self).__init__()
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self.if_act = if_act
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self.act = act
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self.deconv = nn.Conv2DTranspose(
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in_channels=in_channels,
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out_channels=out_channels,
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kernel_size=kernel_size,
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stride=stride,
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padding=(kernel_size - 1) // 2,
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groups=groups,
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weight_attr=ParamAttr(name=name + '_weights'),
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bias_attr=False)
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self.bn = nn.BatchNorm(
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num_channels=out_channels,
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act=act,
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param_attr=ParamAttr(name="bn_" + name + "_scale"),
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bias_attr=ParamAttr(name="bn_" + name + "_offset"),
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moving_mean_name="bn_" + name + "_mean",
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moving_variance_name="bn_" + name + "_variance")
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def forward(self, x):
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x = self.deconv(x)
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x = self.bn(x)
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return x
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class FPN_Up_Fusion(nn.Layer):
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def __init__(self, in_channels):
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super(FPN_Up_Fusion, self).__init__()
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in_channels = in_channels[::-1]
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out_channels = [256, 256, 192, 192, 128]
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self.h0_conv = ConvBNLayer(in_channels[0], out_channels[0], 1, 1, act=None, name='fpn_up_h0')
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self.h1_conv = ConvBNLayer(in_channels[1], out_channels[1], 1, 1, act=None, name='fpn_up_h1')
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self.h2_conv = ConvBNLayer(in_channels[2], out_channels[2], 1, 1, act=None, name='fpn_up_h2')
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self.h3_conv = ConvBNLayer(in_channels[3], out_channels[3], 1, 1, act=None, name='fpn_up_h3')
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self.h4_conv = ConvBNLayer(in_channels[4], out_channels[4], 1, 1, act=None, name='fpn_up_h4')
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self.g0_conv = DeConvBNLayer(out_channels[0], out_channels[1], 4, 2, act=None, name='fpn_up_g0')
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self.g1_conv = nn.Sequential(
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ConvBNLayer(out_channels[1], out_channels[1], 3, 1, act='relu', name='fpn_up_g1_1'),
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DeConvBNLayer(out_channels[1], out_channels[2], 4, 2, act=None, name='fpn_up_g1_2')
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)
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self.g2_conv = nn.Sequential(
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ConvBNLayer(out_channels[2], out_channels[2], 3, 1, act='relu', name='fpn_up_g2_1'),
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DeConvBNLayer(out_channels[2], out_channels[3], 4, 2, act=None, name='fpn_up_g2_2')
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)
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self.g3_conv = nn.Sequential(
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ConvBNLayer(out_channels[3], out_channels[3], 3, 1, act='relu', name='fpn_up_g3_1'),
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DeConvBNLayer(out_channels[3], out_channels[4], 4, 2, act=None, name='fpn_up_g3_2')
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)
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self.g4_conv = nn.Sequential(
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ConvBNLayer(out_channels[4], out_channels[4], 3, 1, act='relu', name='fpn_up_fusion_1'),
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ConvBNLayer(out_channels[4], out_channels[4], 1, 1, act=None, name='fpn_up_fusion_2')
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)
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def _add_relu(self, x1, x2):
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x = paddle.add(x=x1, y=x2)
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x = F.relu(x)
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return x
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def forward(self, x):
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f = x[2:][::-1]
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h0 = self.h0_conv(f[0])
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h1 = self.h1_conv(f[1])
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h2 = self.h2_conv(f[2])
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h3 = self.h3_conv(f[3])
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h4 = self.h4_conv(f[4])
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g0 = self.g0_conv(h0)
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g1 = self._add_relu(g0, h1)
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g1 = self.g1_conv(g1)
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g2 = self.g2_conv(self._add_relu(g1, h2))
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g3 = self.g3_conv(self._add_relu(g2, h3))
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g4 = self.g4_conv(self._add_relu(g3, h4))
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return g4
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class FPN_Down_Fusion(nn.Layer):
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def __init__(self, in_channels):
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super(FPN_Down_Fusion, self).__init__()
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out_channels = [32, 64, 128]
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self.h0_conv = ConvBNLayer(in_channels[0], out_channels[0], 3, 1, act=None, name='fpn_down_h0')
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self.h1_conv = ConvBNLayer(in_channels[1], out_channels[1], 3, 1, act=None, name='fpn_down_h1')
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self.h2_conv = ConvBNLayer(in_channels[2], out_channels[2], 3, 1, act=None, name='fpn_down_h2')
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self.g0_conv = ConvBNLayer(out_channels[0], out_channels[1], 3, 2, act=None, name='fpn_down_g0')
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self.g1_conv = nn.Sequential(
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ConvBNLayer(out_channels[1], out_channels[1], 3, 1, act='relu', name='fpn_down_g1_1'),
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ConvBNLayer(out_channels[1], out_channels[2], 3, 2, act=None, name='fpn_down_g1_2')
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)
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self.g2_conv = nn.Sequential(
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ConvBNLayer(out_channels[2], out_channels[2], 3, 1, act='relu', name='fpn_down_fusion_1'),
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ConvBNLayer(out_channels[2], out_channels[2], 1, 1, act=None, name='fpn_down_fusion_2')
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)
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def forward(self, x):
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f = x[:3]
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h0 = self.h0_conv(f[0])
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h1 = self.h1_conv(f[1])
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h2 = self.h2_conv(f[2])
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g0 = self.g0_conv(h0)
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g1 = paddle.add(x=g0, y=h1)
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g1 = F.relu(g1)
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g1 = self.g1_conv(g1)
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g2 = paddle.add(x=g1, y=h2)
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g2 = F.relu(g2)
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g2 = self.g2_conv(g2)
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return g2
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class Cross_Attention(nn.Layer):
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def __init__(self, in_channels):
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super(Cross_Attention, self).__init__()
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self.theta_conv = ConvBNLayer(in_channels, in_channels, 1, 1, act='relu', name='f_theta')
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self.phi_conv = ConvBNLayer(in_channels, in_channels, 1, 1, act='relu', name='f_phi')
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self.g_conv = ConvBNLayer(in_channels, in_channels, 1, 1, act='relu', name='f_g')
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self.fh_weight_conv = ConvBNLayer(in_channels, in_channels, 1, 1, act=None, name='fh_weight')
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self.fh_sc_conv = ConvBNLayer(in_channels, in_channels, 1, 1, act=None, name='fh_sc')
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self.fv_weight_conv = ConvBNLayer(in_channels, in_channels, 1, 1, act=None, name='fv_weight')
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self.fv_sc_conv = ConvBNLayer(in_channels, in_channels, 1, 1, act=None, name='fv_sc')
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self.f_attn_conv = ConvBNLayer(in_channels * 2, in_channels, 1, 1, act='relu', name='f_attn')
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def _cal_fweight(self, f, shape):
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f_theta, f_phi, f_g = f
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#flatten
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f_theta = paddle.transpose(f_theta, [0, 2, 3, 1])
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f_theta = paddle.reshape(f_theta, [shape[0] * shape[1], shape[2], 128])
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f_phi = paddle.transpose(f_phi, [0, 2, 3, 1])
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f_phi = paddle.reshape(f_phi, [shape[0] * shape[1], shape[2], 128])
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f_g = paddle.transpose(f_g, [0, 2, 3, 1])
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f_g = paddle.reshape(f_g, [shape[0] * shape[1], shape[2], 128])
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#correlation
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f_attn = paddle.matmul(f_theta, paddle.transpose(f_phi, [0, 2, 1]))
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#scale
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f_attn = f_attn / (128**0.5)
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f_attn = F.softmax(f_attn)
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#weighted sum
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f_weight = paddle.matmul(f_attn, f_g)
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f_weight = paddle.reshape(
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f_weight, [shape[0], shape[1], shape[2], 128])
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return f_weight
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def forward(self, f_common):
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f_shape = paddle.shape(f_common)
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# print('f_shape: ', f_shape)
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f_theta = self.theta_conv(f_common)
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f_phi = self.phi_conv(f_common)
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f_g = self.g_conv(f_common)
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######## horizon ########
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fh_weight = self._cal_fweight([f_theta, f_phi, f_g],
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[f_shape[0], f_shape[2], f_shape[3]])
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fh_weight = paddle.transpose(fh_weight, [0, 3, 1, 2])
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fh_weight = self.fh_weight_conv(fh_weight)
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#short cut
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fh_sc = self.fh_sc_conv(f_common)
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f_h = F.relu(fh_weight + fh_sc)
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######## vertical ########
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fv_theta = paddle.transpose(f_theta, [0, 1, 3, 2])
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fv_phi = paddle.transpose(f_phi, [0, 1, 3, 2])
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fv_g = paddle.transpose(f_g, [0, 1, 3, 2])
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fv_weight = self._cal_fweight([fv_theta, fv_phi, fv_g],
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[f_shape[0], f_shape[3], f_shape[2]])
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fv_weight = paddle.transpose(fv_weight, [0, 3, 2, 1])
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fv_weight = self.fv_weight_conv(fv_weight)
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#short cut
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fv_sc = self.fv_sc_conv(f_common)
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f_v = F.relu(fv_weight + fv_sc)
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######## merge ########
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f_attn = paddle.concat([f_h, f_v], axis=1)
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f_attn = self.f_attn_conv(f_attn)
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return f_attn
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class SASTFPN(nn.Layer):
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def __init__(self, in_channels, with_cab=False, **kwargs):
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super(SASTFPN, self).__init__()
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self.in_channels = in_channels
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self.with_cab = with_cab
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self.FPN_Down_Fusion = FPN_Down_Fusion(self.in_channels)
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self.FPN_Up_Fusion = FPN_Up_Fusion(self.in_channels)
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self.out_channels = 128
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self.cross_attention = Cross_Attention(self.out_channels)
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def forward(self, x):
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#down fpn
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f_down = self.FPN_Down_Fusion(x)
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#up fpn
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f_up = self.FPN_Up_Fusion(x)
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#fusion
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f_common = paddle.add(x=f_down, y=f_up)
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f_common = F.relu(f_common)
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if self.with_cab:
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# print('enhence f_common with CAB.')
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f_common = self.cross_attention(f_common)
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return f_common
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