292 lines
13 KiB
Python
292 lines
13 KiB
Python
# taken from https://github.com/calmisential/TensorFlow2.0_ResNet/blob/master/models/resnet.py
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import tensorflow as tf
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class BasicBlock(tf.keras.layers.Layer):
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def __init__(self, filter_num, stride=1, upsample=False):
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super(BasicBlock, self).__init__()
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if not upsample:
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self.conv1 = tf.keras.layers.Conv2D(filters=filter_num,
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kernel_size=(3, 3),
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strides=stride,
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padding="same")
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else:
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self.conv1 = tf.keras.layers.Conv2DTranspose(filters=filter_num,
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kernel_size=(3, 3),
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strides=stride,
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padding="same")
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self.bn1 = tf.keras.layers.BatchNormalization()
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self.conv2 = tf.keras.layers.Conv2D(filters=filter_num,
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kernel_size=(3, 3),
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strides=1,
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padding="same")
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self.bn2 = tf.keras.layers.BatchNormalization()
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if stride != 1:
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if not upsample:
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self.updownsample = tf.keras.Sequential()
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self.updownsample.add(tf.keras.layers.Conv2D(filters=filter_num,
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kernel_size=(1, 1),
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strides=stride))
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self.updownsample.add(tf.keras.layers.BatchNormalization())
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else:
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self.updownsample = tf.keras.Sequential()
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self.updownsample.add(tf.keras.layers.Conv2DTranspose(filters=filter_num,
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kernel_size=(1, 1),
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strides=stride))
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self.updownsample.add(tf.keras.layers.BatchNormalization())
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else:
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self.updownsample = lambda x: x
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def call(self, inputs, training=None, **kwargs):
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residual = self.updownsample(inputs)
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x = self.conv1(inputs)
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x = self.bn1(x, training=training)
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x = tf.nn.relu(x)
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x = self.conv2(x)
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x = self.bn2(x, training=training)
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output = tf.nn.relu(tf.keras.layers.add([residual, x]))
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return output
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class BottleNeck(tf.keras.layers.Layer):
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def __init__(self, filter_num, stride=1, upsample=False):
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super(BottleNeck, self).__init__()
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self.conv1 = tf.keras.layers.Conv2D(filters=filter_num,
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kernel_size=(1, 1),
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strides=1,
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padding='same')
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self.bn1 = tf.keras.layers.BatchNormalization()
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if not upsample:
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self.conv2 = tf.keras.layers.Conv2D(filters=filter_num,
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kernel_size=(3, 3),
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strides=stride,
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padding='same')
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else:
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self.conv2 = tf.keras.layers.Conv2DTranspose(filters=filter_num,
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kernel_size=(3, 3),
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strides=stride,
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padding='same')
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self.bn2 = tf.keras.layers.BatchNormalization()
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self.conv3 = tf.keras.layers.Conv2D(filters=filter_num * 4,
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kernel_size=(1, 1),
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strides=1,
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padding='same')
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self.bn3 = tf.keras.layers.BatchNormalization()
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self.updownsample = tf.keras.Sequential()
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if not upsample:
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self.updownsample.add(tf.keras.layers.Conv2D(filters=filter_num * 4,
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kernel_size=(1, 1),
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strides=stride))
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else:
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self.updownsample.add(tf.keras.layers.Conv2DTranspose(filters=filter_num * 4,
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kernel_size=(1, 1),
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strides=stride))
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self.updownsample.add(tf.keras.layers.BatchNormalization())
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def call(self, inputs, training=None, **kwargs):
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residual = self.updownsample(inputs)
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x = self.conv1(inputs)
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x = self.bn1(x, training=training)
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x = tf.nn.relu(x)
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x = self.conv2(x)
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x = self.bn2(x, training=training)
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x = tf.nn.relu(x)
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x = self.conv3(x)
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x = self.bn3(x, training=training)
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output = tf.nn.relu(tf.keras.layers.add([residual, x]))
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return output
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def make_basic_block_layer(filter_num, blocks, stride=1, upsample=False):
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res_block = tf.keras.Sequential()
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res_block.add(BasicBlock(filter_num, stride=stride, upsample=upsample))
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for _ in range(1, blocks):
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res_block.add(BasicBlock(filter_num, stride=1))
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return res_block
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def make_bottleneck_layer(filter_num, blocks, stride=1, upsample=False):
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res_block = tf.keras.Sequential()
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res_block.add(BottleNeck(filter_num, stride=stride, upsample=upsample))
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for _ in range(1, blocks):
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res_block.add(BottleNeck(filter_num, stride=1))
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return res_block
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class ResNetTypeI(tf.keras.Model):
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def __init__(self, layer_params, features, reversed=False, labels=None, is_cvae=False):
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super(ResNetTypeI, self).__init__()
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self.reversed = reversed
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self.labels = labels
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if not reversed:
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self.conv1 = tf.keras.layers.Conv2D(filters=64,
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kernel_size=(7, 7),
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strides=2,
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padding="same")
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self.bn1 = tf.keras.layers.BatchNormalization()
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self.pool1 = tf.keras.layers.MaxPool2D(pool_size=(3, 3),
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strides=2,
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padding="same")
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else:
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self.conv1 = tf.keras.layers.Conv2DTranspose(filters=3 if labels is None else labels,
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kernel_size=(7, 7),
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strides=2,
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padding="same")
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self.bn1 = tf.keras.layers.BatchNormalization()
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self.pool1 = tf.keras.layers.UpSampling2D()
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self.layer1 = make_basic_block_layer(filter_num=64,
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blocks=layer_params[0],
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stride=1 if not reversed else 2,
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upsample=reversed)
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self.layer2 = make_basic_block_layer(filter_num=64,
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blocks=layer_params[1],
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stride=2,
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upsample=reversed)
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self.layer3 = make_basic_block_layer(filter_num=64,
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blocks=layer_params[2],
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stride=2,
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upsample=reversed)
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self.layer4 = make_basic_block_layer(filter_num=128,
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blocks=layer_params[3],
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stride=2,
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upsample=reversed)
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self.layer5 = make_basic_block_layer(filter_num=features if not is_cvae else features*2,
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blocks=layer_params[4],
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stride=2 if not reversed else 1,
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upsample=reversed)
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def call(self, inputs, training=None, mask=None):
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if not self.reversed:
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x = self.conv1(inputs)
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x = self.bn1(x, training=training)
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x = tf.nn.relu(x)
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x = self.pool1(x)
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x = self.layer1(x, training=training)
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x = self.layer2(x, training=training)
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x = self.layer3(x, training=training)
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x = self.layer4(x, training=training)
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x = self.layer5(x, training=training)
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else:
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x = self.layer5(inputs, training=training)
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x = self.layer4(x, training=training)
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x = self.layer3(x, training=training)
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x = self.layer2(x, training=training)
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x = self.layer1(x, training=training)
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x = self.pool1(x)
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x = self.bn1(x, training=training)
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# x = tf.nn.relu(x)
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x = self.conv1(x)
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if self.labels is None:
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x = tf.nn.tanh(x)
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# else:
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# x = tf.nn.softmax(x)
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return x
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class ResNetTypeII(tf.keras.Model):
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def __init__(self, layer_params, features, reversed=False, labels=None, is_cvae=False):
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super(ResNetTypeII, self).__init__()
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self.reversed = reversed
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self.labels = labels
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if not reversed:
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self.conv1 = tf.keras.layers.Conv2D(filters=64,
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kernel_size=(7, 7),
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strides=2,
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padding="same")
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self.bn1 = tf.keras.layers.BatchNormalization()
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self.pool1 = tf.keras.layers.MaxPool2D(pool_size=(3, 3),
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strides=2,
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padding="same")
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else:
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self.conv1 = tf.keras.layers.Conv2DTranspose(filters=3 if labels is None else labels,
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kernel_size=(7, 7),
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strides=2,
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padding="same")
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self.bn1 = tf.keras.layers.BatchNormalization()
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self.pool1 = tf.keras.layers.UpSampling2D()
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self.layer1 = make_bottleneck_layer(filter_num=64,
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blocks=layer_params[0],
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stride=1 if not reversed else 2,
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upsample=reversed)
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self.layer2 = make_bottleneck_layer(filter_num=128,
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blocks=layer_params[1],
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stride=2,
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upsample=reversed)
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self.layer3 = make_bottleneck_layer(filter_num=256,
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blocks=layer_params[2],
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stride=2,
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upsample=reversed)
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self.layer4 = make_bottleneck_layer(filter_num=512,
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blocks=layer_params[3],
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stride=2,
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upsample=reversed)
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self.layer5 = make_bottleneck_layer(filter_num=features if not is_cvae else features*2,
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blocks=layer_params[4],
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stride=2 if not reversed else 1,
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upsample=reversed)
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def call(self, inputs, training=None, mask=None):
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if not self.reversed:
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x = self.conv1(inputs)
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x = self.bn1(x, training=training)
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x = tf.nn.relu(x)
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x = self.pool1(x)
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x = self.layer1(x, training=training)
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x = self.layer2(x, training=training)
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x = self.layer3(x, training=training)
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x = self.layer4(x, training=training)
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x = self.layer5(x, training=training)
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else:
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x = self.layer5(inputs, training=training)
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x = self.layer4(x, training=training)
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x = self.layer3(x, training=training)
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x = self.layer2(x, training=training)
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x = self.layer1(x, training=training)
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x = self.pool1(x)
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x = self.bn1(x, training=training)
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x = self.conv1(x)
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if self.labels is None:
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x = tf.nn.tanh(x)
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return x
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def resnet_18(features, reversed=False, labels=None, is_cvae=False):
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return ResNetTypeI(layer_params=[2, 2, 2, 2, 2], features=features, reversed=reversed, labels=labels, is_cvae=is_cvae)
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def resnet_34():
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return ResNetTypeI(layer_params=[3, 4, 6, 3])
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def resnet_50():
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return ResNetTypeII(layer_params=[3, 4, 6, 3])
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def resnet_101(features, reversed=False, labels=None, is_cvae=False):
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return ResNetTypeII(layer_params=[3, 4, 23, 3, 3], features=features, reversed=reversed, labels=labels, is_cvae=is_cvae)
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def resnet_152():
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return ResNetTypeII(layer_params=[3, 8, 36, 3]) |