Data Science Asked by Olfa2 on July 29, 2021
class Block(keras.Model):
def __init__(self,intermediate_channels, stride=(1,1), identity_downsample=None):
super(Block, self).__init__()
self.expansion=4
self.padding0 = layers.ZeroPadding2D(padding=(0,0))
self.padding1 = layers.ZeroPadding2D(padding=(1,1))
self.padding2 = layers.ZeroPadding2D(padding=(2,2))
self.padding3 = layers.ZeroPadding2D(padding=(3,3))
self.conv1 = layers.Conv2D(intermediate_channels, kernel_size=(1,1), strides=(1,1), padding="VALID")
self.bn1 = layers.BatchNormalization()
self.conv2 = layers.Conv2D(intermediate_channels,kernel_size=(3,3), strides=stride,padding="VALID")
self.bn2 = layers.BatchNormalization(intermediate_channels)
self.conv3 = layers.Conv2D(intermediate_channels* self.expansion,kernel_size=(1,1), strides=(1,1), padding="VALID")
self.bn3 = layers.BatchNormalization(intermediate_channels* self.expansion)
self.relu = layers.ReLU()
self.identity_downsample = identity_downsample
self.stride = stride
def call(self, inputs):
identity = tf.identity(inputs)
x = self.padding0(inputs)
x = self.conv1(x)
x = self.bn1(x)
x = self.relu(x)
x = self.padding1(x)
x = self.conv2(x)
x = self.bn2(x)
x = self.padding0(x)
x = self.conv3(x)
x = self.bn3(x)
if self.identity_downsample is not None:
identity = self.identity_downsample(identity)
x = x + identity
x = self.relu(x)
return x
class ResNet(keras.Model):
def __init__(self, ls, num_classes):
super(ResNet,self).__init__()
self.ls = ls
self.in_channels = 64
self.pad3 = layers.ZeroPadding2D(padding=(3,3))
self.pad1 = layers.ZeroPadding2D(padding=(1,1))
self.conv1 = layers.Conv2D(64,kernel_size=7, strides=(2,2), padding="VALID")
self.bn1 = layers.BatchNormalization(64)
self.relu = layers.ReLU()
self.maxpool = layers.MaxPool2D(pool_size=3, strides=(2,2), padding="VALID")
# RESNET BLOCKS
self.layer1 = self.create_layers(ls[0], intermediate_channels=64, stride=(1,1))
self.layer2 = self.create_layers(ls[1], intermediate_channels=128, stride=(2,2))
self.layer3 = self.create_layers(ls[2], intermediate_channels=256, stride=(2,2))
self.layer4 = self.create_layers(ls[3], intermediate_channels=512, stride=(2,2))
self.avgPool = layers.AveragePooling2D(pool_size=(1, 1))
self.fc = layers.Dense(num_classes)
def create_layers(self, number_of_rb, intermediate_channels, stride):
identity_downsample = None
c_layers = []
if stride !=1 or self.in_channels!= intermediate_channels * 4:
identity_downsample = keras.Sequential([layers.Conv2D(filters=intermediate_channels*4,
kernel_size=(1,1),
strides=stride,
padding="VALID"),
layers.BatchNormalization(intermediate_channels*4)])
c_layers.append(Block(intermediate_channels, stride, identity_downsample))
print(x_layers[0])
self.in_channels= intermediate_channels*4
for i in range(number_of_rb-1):
c_layers.append(Block(intermediate_channels))
print(x_layers[i])
return keras.Sequential(c_layers)
def call(self, inputs):
x = self.pad3(inputs)
x = self.conv1(inputs)
x = self.bn1(x)
x = self.relu(x)
x = self.pad1(x)
x = self.maxpool(x)
x = self.layer1(x)
x = self.layer2(x)
x = self.layer3(x)
x = self.layer4(x)
x = self.avgPool(x)
x = self.fc(layers.Flatten()(x))
return x
def ResNet50(num_classes=1000):
return ResNet(Block, ls=[3, 4, 6, 3], num_classes=1000)
def test():
net = ResNet50()
y = net(tf.random.uniform(4,224, 224,3))
print(y.size())
test()
When calling the test function, it shows this error :
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