This repository has been archived by the owner on Nov 23, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 7
/
Copy pathmfnet_3d.py
162 lines (134 loc) · 6.28 KB
/
mfnet_3d.py
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
# -*- coding: utf-8 -*-
"""
Original Author: Yunpeng Chen
https://github.com/cypw/PyTorch-MFNet/blob/master/network/mfnet_3d.py
"""
from collections import OrderedDict
import torch.nn as nn
class BN_AC_CONV3D(nn.Module):
def __init__(self, num_in, num_filter,
kernel=(1,1,1), pad=(0,0,0), stride=(1,1,1), g=1, bias=False):
super(BN_AC_CONV3D, self).__init__()
self.bn = nn.BatchNorm3d(num_in)
self.relu = nn.ReLU(inplace=True)
self.conv = nn.Conv3d(num_in, num_filter, kernel_size=kernel, padding=pad,
stride=stride, groups=g, bias=bias)
def forward(self, x):
h = self.relu(self.bn(x))
h = self.conv(h)
return h
class MF_UNIT(nn.Module):
def __init__(self, num_in, num_mid, num_out, g=1, stride=(1,1,1), first_block=False, use_3d=True):
super(MF_UNIT, self).__init__()
num_ix = int(num_mid/4)
kt,pt = (3,1) if use_3d else (1,0)
# prepare input
self.conv_i1 = BN_AC_CONV3D(num_in=num_in, num_filter=num_ix, kernel=(1,1,1), pad=(0,0,0))
self.conv_i2 = BN_AC_CONV3D(num_in=num_ix, num_filter=num_in, kernel=(1,1,1), pad=(0,0,0))
# main part
self.conv_m1 = BN_AC_CONV3D(num_in=num_in, num_filter=num_mid, kernel=(kt,3,3), pad=(pt,1,1), stride=stride, g=g)
if first_block:
self.conv_m2 = BN_AC_CONV3D(num_in=num_mid, num_filter=num_out, kernel=(1,1,1), pad=(0,0,0))
else:
self.conv_m2 = BN_AC_CONV3D(num_in=num_mid, num_filter=num_out, kernel=(1,3,3), pad=(0,1,1), g=g)
# adapter
if first_block:
self.conv_w1 = BN_AC_CONV3D(num_in=num_in, num_filter=num_out, kernel=(1,1,1), pad=(0,0,0), stride=stride)
def forward(self, x):
h = self.conv_i1(x)
x_in = x + self.conv_i2(h)
h = self.conv_m1(x_in)
h = self.conv_m2(h)
if hasattr(self, 'conv_w1'):
x = self.conv_w1(x)
return h + x
class MFNET_3D(nn.Module):
def __init__(self, num_classes, dropout=None, pretrained=False, pretrained_model="", **kwargs):
super(MFNET_3D, self).__init__()
groups = 16
k_sec = { 2: 3, \
3: 4, \
4: 6, \
5: 3 }
# conv1 - x224 (x16)
conv1_num_out = 16
self.conv1 = nn.Sequential(OrderedDict([
('conv', nn.Conv3d( 3, conv1_num_out, kernel_size=(3,5,5), padding=(1,2,2), stride=(1,2,2), bias=False)),
('bn', nn.BatchNorm3d(conv1_num_out)),
('relu', nn.ReLU(inplace=True))
]))
self.maxpool = nn.MaxPool3d(kernel_size=(1,3,3), stride=(1,2,2), padding=(0,1,1))
# conv2 - x56 (x8)
num_mid = 96
conv2_num_out = 96
self.conv2 = nn.Sequential(OrderedDict([
("B%02d"%i, MF_UNIT(num_in=conv1_num_out if i==1 else conv2_num_out,
num_mid=num_mid,
num_out=conv2_num_out,
stride=(2,1,1) if i==1 else (1,1,1),
g=groups,
first_block=(i==1))) for i in range(1,k_sec[2]+1)
]))
# conv3 - x28 (x8)
num_mid *= 2
conv3_num_out = 2 * conv2_num_out
self.conv3 = nn.Sequential(OrderedDict([
("B%02d"%i, MF_UNIT(num_in=conv2_num_out if i==1 else conv3_num_out,
num_mid=num_mid,
num_out=conv3_num_out,
stride=(1,2,2) if i==1 else (1,1,1),
g=groups,
first_block=(i==1))) for i in range(1,k_sec[3]+1)
]))
# conv4 - x14 (x8)
num_mid *= 2
conv4_num_out = 2 * conv3_num_out
self.conv4 = nn.Sequential(OrderedDict([
("B%02d"%i, MF_UNIT(num_in=conv3_num_out if i==1 else conv4_num_out,
num_mid=num_mid,
num_out=conv4_num_out,
stride=(1,2,2) if i==1 else (1,1,1),
g=groups,
first_block=(i==1))) for i in range(1,k_sec[4]+1)
]))
# conv5 - x7 (x8)
num_mid *= 2
conv5_num_out = 2 * conv4_num_out
self.conv5 = nn.Sequential(OrderedDict([
("B%02d"%i, MF_UNIT(num_in=conv4_num_out if i==1 else conv5_num_out,
num_mid=num_mid,
num_out=conv5_num_out,
stride=(1,2,2) if i==1 else (1,1,1),
g=groups,
first_block=(i==1))) for i in range(1,k_sec[5]+1)
]))
# final
self.tail = nn.Sequential(OrderedDict([
('bn', nn.BatchNorm3d(conv5_num_out)),
('relu', nn.ReLU(inplace=True))
]))
if dropout:
self.globalpool = nn.Sequential(OrderedDict([
('avg', nn.AvgPool3d(kernel_size=(8,7,7), stride=(1,1,1))),
('dropout', nn.Dropout(p=dropout)),
]))
else:
self.globalpool = nn.Sequential(OrderedDict([
('avg', nn.AvgPool3d(kernel_size=(8,7,7), stride=(1,1,1))),
# ('dropout', nn.Dropout(p=0.5)), only for fine-tuning
]))
self.classifier = nn.Linear(conv5_num_out, num_classes)
def forward(self, x):
assert x.shape[2] == 16
h = self.conv1(x) # x224 -> x112
h = self.maxpool(h) # x112 -> x56
h = self.conv2(h) # x56 -> x56
h = self.conv3(h) # x56 -> x28
h = self.conv4(h) # x28 -> x14
h = self.conv5(h) # x14 -> x7
h = self.tail(h)
layerout = h.detach().cpu()
h = self.globalpool(h)
h = h.view(h.shape[0], -1)
h = self.classifier(h)
return h, layerout