unet.py
6.84 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
import torch
import torch.nn as nn
from torch.nn import Parameter
import torch.nn.functional as F
import torch.utils.data as data
import functools
class conv_block(nn.Module):
"""
Convolution Block
"""
def __init__(self, in_ch, out_ch):
super(conv_block, self).__init__()
self.conv = nn.Sequential(
nn.Conv2d(in_ch, out_ch, kernel_size=3, stride=1, padding=1, bias=True),
nn.BatchNorm2d(out_ch),
nn.ReLU(inplace=True),
nn.Conv2d(out_ch, out_ch, kernel_size=3, stride=1, padding=1, bias=True),
nn.BatchNorm2d(out_ch),
nn.ReLU(inplace=True))
def forward(self, x):
x = self.conv(x)
return x
class up_conv(nn.Module):
"""
Up Convolution Block
"""
def __init__(self, in_ch, out_ch):
super(up_conv, self).__init__()
self.up = nn.Sequential(
nn.Upsample(scale_factor=2),
nn.Conv2d(in_ch, out_ch, kernel_size=3, stride=1, padding=1, bias=True),
nn.BatchNorm2d(out_ch),
nn.ReLU(inplace=True)
)
def forward(self, x):
x = self.up(x)
return x
class Recurrent_block(nn.Module):
"""
Recurrent Block for R2Unet_CNN
"""
def __init__(self, out_ch, t=2):
super(Recurrent_block, self).__init__()
self.t = t
self.out_ch = out_ch
self.conv = nn.Sequential(
nn.Conv2d(out_ch, out_ch, kernel_size=3, stride=1, padding=1, bias=True),
nn.BatchNorm2d(out_ch),
nn.ReLU(inplace=True)
)
def forward(self, x):
for i in range(self.t):
if i == 0:
x = self.conv(x)
out = self.conv(x + x)
return out
class RRCNN_block(nn.Module):
"""
Recurrent Residual Convolutional Neural Network Block
"""
def __init__(self, in_ch, out_ch, t=2):
super(RRCNN_block, self).__init__()
self.RCNN = nn.Sequential(
Recurrent_block(out_ch, t=t),
Recurrent_block(out_ch, t=t)
)
self.Conv = nn.Conv2d(in_ch, out_ch, kernel_size=1, stride=1, padding=0)
def forward(self, x):
x1 = self.Conv(x)
x2 = self.RCNN(x1)
out = x1 + x2
return out
class Attention_block(nn.Module):
"""
Attention Block
"""
def __init__(self, F_g, F_l, F_int):
super(Attention_block, self).__init__()
self.W_g = nn.Sequential(
nn.Conv2d(F_l, F_int, kernel_size=1, stride=1, padding=0, bias=True),
nn.BatchNorm2d(F_int)
)
self.W_x = nn.Sequential(
nn.Conv2d(F_g, F_int, kernel_size=1, stride=1, padding=0, bias=True),
nn.BatchNorm2d(F_int)
)
self.psi = nn.Sequential(
nn.Conv2d(F_int, 1, kernel_size=1, stride=1, padding=0, bias=True),
nn.BatchNorm2d(1),
nn.Sigmoid()
)
self.relu = nn.ReLU(inplace=True)
def forward(self, g, x):
g1 = self.W_g(g)
x1 = self.W_x(x)
psi = self.relu(g1 + x1)
psi = self.psi(psi)
out = x * psi
return out
class SE_Block(nn.Module):
"credits: https://github.com/moskomule/senet.pytorch/blob/master/senet/se_module.py#L4"
def __init__(self, c, r=16):
super().__init__()
self.squeeze = nn.AdaptiveAvgPool2d(1)
self.excitation = nn.Sequential(
nn.Linear(c, c // r, bias=False),
nn.ReLU(inplace=True),
nn.Linear(c // r, c, bias=False),
nn.Sigmoid()
)
def forward(self, x):
bs, c, _, _ = x.shape
y = self.squeeze(x).view(bs, c)
y = self.excitation(y).view(bs, c, 1, 1)
return x * y.expand_as(x)
class AtrousConv(nn.Module):
def __init__(self, in_ch):
super().__init__()
self.atrous_conv = nn.Sequential(
nn.Conv2d(in_ch, in_ch, kernel_size=3, stride=1, dilation=2, padding=2),
nn.BatchNorm2d(in_ch),
nn.ReLU(),
nn.Conv2d(in_ch, in_ch, kernel_size=3, stride=1, dilation=4, padding=4),
nn.BatchNorm2d(in_ch),
nn.ReLU(),
nn.Conv2d(in_ch, in_ch, kernel_size=3, stride=1, dilation=8, padding=8),
nn.BatchNorm2d(in_ch),
nn.ReLU(),
nn.Conv2d(in_ch, in_ch, kernel_size=3, stride=1, dilation=16, padding=16),
nn.BatchNorm2d(in_ch),
nn.ReLU(),
)
def forward(self, x):
return self.atrous_conv(x)
class UNetSemantic(nn.Module):
"""
UNet - Basic Implementation
Paper : https://arxiv.org/abs/1505.04597
"""
def __init__(self, in_ch=3, out_ch=1):
super(UNetSemantic, self).__init__()
n1 = 32
filters = [n1, n1 * 2, n1 * 4, n1 * 8, n1 * 16]
self.Maxpool1 = nn.MaxPool2d(kernel_size=2, stride=2)
self.Maxpool2 = nn.MaxPool2d(kernel_size=2, stride=2)
self.Maxpool3 = nn.MaxPool2d(kernel_size=2, stride=2)
self.Maxpool4 = nn.MaxPool2d(kernel_size=2, stride=2)
self.Conv1 = conv_block(in_ch, filters[0])
self.Conv2 = conv_block(filters[0], filters[1])
self.Conv3 = conv_block(filters[1], filters[2])
self.Conv4 = conv_block(filters[2], filters[3])
self.Conv5 = conv_block(filters[3], filters[4])
self.Up5 = up_conv(filters[4], filters[3])
self.Up_conv5 = conv_block(filters[4], filters[3])
self.Up4 = up_conv(filters[3], filters[2])
self.Up_conv4 = conv_block(filters[3], filters[2])
self.Up3 = up_conv(filters[2], filters[1])
self.Up_conv3 = conv_block(filters[2], filters[1])
self.Up2 = up_conv(filters[1], filters[0])
self.Up_conv2 = conv_block(filters[1], filters[0])
self.Conv = nn.Conv2d(filters[0], out_ch, kernel_size=1, stride=1, padding=0)
self.se1 = SE_Block(filters[0])
self.se2 = SE_Block(filters[1])
self.se3 = SE_Block(filters[2])
self.active = torch.nn.Sigmoid()
def forward(self, x):
e1 = self.Conv1(x)
e1 = self.se1(e1)
e2 = self.Maxpool1(e1)
e2 = self.Conv2(e2)
e2 = self.se2(e2)
e3 = self.Maxpool2(e2)
e3 = self.Conv3(e3)
e3 = self.se3(e3)
e4 = self.Maxpool3(e3)
e4 = self.Conv4(e4)
e5 = self.Maxpool4(e4)
e5 = self.Conv5(e5)
d5 = self.Up5(e5)
d5 = torch.cat((e4, d5), dim=1)
d5 = self.Up_conv5(d5)
d4 = self.Up4(d5)
d4 = torch.cat((e3, d4), dim=1)
d4 = self.Up_conv4(d4)
d3 = self.Up3(d4)
d3 = torch.cat((e2, d3), dim=1)
d3 = self.Up_conv3(d3)
d2 = self.Up2(d3)
d2 = torch.cat((e1, d2), dim=1)
d2 = self.Up_conv2(d2)
out = self.Conv(d2)
out = self.active(out)
return out