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ResNet.py
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ResNet.py
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import chainer
import chainer.functions as F
from chainer import initializers
import chainer.links as L
class BottleNeckA(chainer.Chain):
def __init__(self, in_size, ch, out_size, stride=2):
super(BottleNeckA, self).__init__()
initialW = initializers.HeNormal()
with self.init_scope():
self.conv1 = L.Convolution2D(
in_size, ch, 1, stride, 0, initialW=initialW, nobias=True)
self.bn1 = L.BatchNormalization(ch)
self.conv2 = L.Convolution2D(
ch, ch, 3, 1, 1, initialW=initialW, nobias=True)
self.bn2 = L.BatchNormalization(ch)
self.conv3 = L.Convolution2D(
ch, out_size, 1, 1, 0, initialW=initialW, nobias=True)
self.bn3 = L.BatchNormalization(out_size)
self.conv4 = L.Convolution2D(
in_size, out_size, 1, stride, 0,
initialW=initialW, nobias=True)
self.bn4 = L.BatchNormalization(out_size)
def __call__(self, x):
h1 = F.relu(self.bn1(self.conv1(x)))
h1 = F.relu(self.bn2(self.conv2(h1)))
h1 = self.bn3(self.conv3(h1))
h2 = self.bn4(self.conv4(x))
return F.relu(h1 + h2)
class BottleNeckB(chainer.Chain):
def __init__(self, in_size, ch):
super(BottleNeckB, self).__init__()
initialW = initializers.HeNormal()
with self.init_scope():
self.conv1 = L.Convolution2D(
in_size, ch, 1, 1, 0, initialW=initialW, nobias=True)
self.bn1 = L.BatchNormalization(ch)
self.conv2 = L.Convolution2D(
ch, ch, 3, 1, 1, initialW=initialW, nobias=True)
self.bn2 = L.BatchNormalization(ch)
self.conv3 = L.Convolution2D(
ch, in_size, 1, 1, 0, initialW=initialW, nobias=True)
self.bn3 = L.BatchNormalization(in_size)
def __call__(self, x):
h = F.relu(self.bn1(self.conv1(x)))
h = F.relu(self.bn2(self.conv2(h)))
h = self.bn3(self.conv3(h))
return F.relu(h + x)
class Block(chainer.Chain):
def __init__(self, layer, in_size, ch, out_size, stride=2):
super(Block, self).__init__()
with self.init_scope():
self.a = BottleNeckA(in_size, ch, out_size, stride)
for i in range(1, layer):
setattr(self, 'b'+str(i), BottleNeckB(out_size, ch))
self.layer = layer
def __call__(self, x):
h = self.a(x)
for i in range(1, self.layer):
h = self['b{}'.format(i)](h)
return h
class ResNetCAM(chainer.Chain):
insize = 224
def __init__(self):
super(ResNetCAM, self).__init__()
with self.init_scope():
self.conv1 = L.Convolution2D(
3, 64, 7, 2, 3, initialW=initializers.HeNormal(), nobias=True)
self.bn1 = L.BatchNormalization(64)
self.res2 = Block(3, 64, 64, 256, 1)
self.res3 = Block(4, 256, 128, 512)
self.res4 = Block(6, 512, 256, 1024)
self.res5 = Block(3, 1024, 512, 2048)
self.fc6 = L.Linear(2048, 1000)
def __call__(self, x):
h = self.bn1(self.conv1(x))
h = F.max_pooling_2d(F.relu(h), 3, stride=2)
h = self.res2(h)
h = self.res3(h)
h = self.res4(h)
last_conv_output = self.res5(h)
h = F.average_pooling_2d(last_conv_output, 7, stride=1)
preds = self.fc6(h)
return last_conv_output, preds