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segnet.py
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segnet.py
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import keras.backend as K
import tensorflow as tf
from keras.layers import Input, Conv2D, UpSampling2D, BatchNormalization, ZeroPadding2D, MaxPooling2D, Reshape, \
Concatenate, Lambda
from keras.models import Model
from keras.utils import multi_gpu_model
from keras.utils import plot_model
from config import img_cols, img_rows
from custom_layers.unpooling_layer import Unpooling
def build_encoder_decoder():
kernel = 3
# Encoder
#
input_tensor = Input(shape=(img_rows, img_cols, 4))
x = ZeroPadding2D((1, 1))(input_tensor)
x = Conv2D(64, (kernel, kernel), activation='relu', name='conv1_1')(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(64, (kernel, kernel), activation='relu', name='conv1_2')(x)
orig_1 = x
x = MaxPooling2D((2, 2), strides=(2, 2))(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(128, (kernel, kernel), activation='relu', name='conv2_1')(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(128, (kernel, kernel), activation='relu', name='conv2_2')(x)
orig_2 = x
x = MaxPooling2D((2, 2), strides=(2, 2))(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(256, (kernel, kernel), activation='relu', name='conv3_1')(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(256, (kernel, kernel), activation='relu', name='conv3_2')(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(256, (kernel, kernel), activation='relu', name='conv3_3')(x)
orig_3 = x
x = MaxPooling2D((2, 2), strides=(2, 2))(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(512, (kernel, kernel), activation='relu', name='conv4_1')(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(512, (kernel, kernel), activation='relu', name='conv4_2')(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(512, (kernel, kernel), activation='relu', name='conv4_3')(x)
orig_4 = x
x = MaxPooling2D((2, 2), strides=(2, 2))(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(512, (kernel, kernel), activation='relu', name='conv5_1')(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(512, (kernel, kernel), activation='relu', name='conv5_2')(x)
x = ZeroPadding2D((1, 1))(x)
x = Conv2D(512, (kernel, kernel), activation='relu', name='conv5_3')(x)
orig_5 = x
x = MaxPooling2D((2, 2), strides=(2, 2))(x)
# Decoder
#
x = UpSampling2D(size=(2, 2))(x)
the_shape = K.int_shape(orig_5)
shape = (1, the_shape[1], the_shape[2], the_shape[3])
origReshaped = Reshape(shape)(orig_5)
xReshaped = Reshape(shape)(x)
together = Concatenate(axis=1)([origReshaped, xReshaped])
x = Unpooling()(together)
x = Conv2D(512, (kernel, kernel), activation='relu', padding='same', name='deconv5_1',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(512, (kernel, kernel), activation='relu', padding='same', name='deconv5_2',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(512, (kernel, kernel), activation='relu', padding='same', name='deconv5_3',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = UpSampling2D(size=(2, 2))(x)
the_shape = K.int_shape(orig_4)
shape = (1, the_shape[1], the_shape[2], the_shape[3])
origReshaped = Reshape(shape)(orig_4)
xReshaped = Reshape(shape)(x)
together = Concatenate(axis=1)([origReshaped, xReshaped])
x = Unpooling()(together)
x = Conv2D(256, (kernel, kernel), activation='relu', padding='same', name='deconv4_1',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(256, (kernel, kernel), activation='relu', padding='same', name='deconv4_2',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(256, (kernel, kernel), activation='relu', padding='same', name='deconv4_3',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = UpSampling2D(size=(2, 2))(x)
the_shape = K.int_shape(orig_3)
shape = (1, the_shape[1], the_shape[2], the_shape[3])
origReshaped = Reshape(shape)(orig_3)
xReshaped = Reshape(shape)(x)
together = Concatenate(axis=1)([origReshaped, xReshaped])
x = Unpooling()(together)
x = Conv2D(128, (kernel, kernel), activation='relu', padding='same', name='deconv3_1',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(128, (kernel, kernel), activation='relu', padding='same', name='deconv3_2',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(128, (kernel, kernel), activation='relu', padding='same', name='deconv3_3',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = UpSampling2D(size=(2, 2))(x)
the_shape = K.int_shape(orig_2)
shape = (1, the_shape[1], the_shape[2], the_shape[3])
origReshaped = Reshape(shape)(orig_2)
xReshaped = Reshape(shape)(x)
together = Concatenate(axis=1)([origReshaped, xReshaped])
x = Unpooling()(together)
x = Conv2D(64, (kernel, kernel), activation='relu', padding='same', name='deconv2_1',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(64, (kernel, kernel), activation='relu', padding='same', name='deconv2_2',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = UpSampling2D(size=(2, 2))(x)
the_shape = K.int_shape(orig_1)
shape = (1, the_shape[1], the_shape[2], the_shape[3])
origReshaped = Reshape(shape)(orig_1)
xReshaped = Reshape(shape)(x)
together = Concatenate(axis=1)([origReshaped, xReshaped])
x = Unpooling()(together)
x = Conv2D(64, (kernel, kernel), activation='relu', padding='same', name='deconv1_1',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(64, (kernel, kernel), activation='relu', padding='same', name='deconv1_2',
kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(1, (kernel, kernel), activation='sigmoid', padding='same', name='pred', kernel_initializer='he_normal',
bias_initializer='zeros')(x)
model = Model(inputs=input_tensor, outputs=x)
return model
def build_refinement(encoder_decoder):
input_tensor = encoder_decoder.input
input = Lambda(lambda i: i[:, :, :, 0:3])(input_tensor)
x = Concatenate(axis=3)([input, encoder_decoder.output])
x = Conv2D(64, (3, 3), activation='relu', padding='same', kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(64, (3, 3), activation='relu', padding='same', kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(64, (3, 3), activation='relu', padding='same', kernel_initializer='he_normal',
bias_initializer='zeros')(x)
x = BatchNormalization()(x)
x = Conv2D(1, (3, 3), activation='sigmoid', padding='same', name='refinement_pred', kernel_initializer='he_normal',
bias_initializer='zeros')(x)
model = Model(inputs=input_tensor, outputs=x)
return model
if __name__ == '__main__':
with tf.device("/cpu:0"):
encoder_decoder = build_encoder_decoder()
print(encoder_decoder.summary())
plot_model(encoder_decoder, to_file='encoder_decoder.svg', show_layer_names=True, show_shapes=True)
with tf.device("/cpu:0"):
refinement = build_refinement(encoder_decoder)
print(refinement.summary())
plot_model(refinement, to_file='refinement.svg', show_layer_names=True, show_shapes=True)
parallel_model = multi_gpu_model(refinement, gpus=None)
print(parallel_model.summary())
plot_model(parallel_model, to_file='parallel_model.svg', show_layer_names=True, show_shapes=True)
K.clear_session()