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unet.py
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import os
from keras.models import Model # Functional API
from keras.layers import (
Conv2D, Input, MaxPooling2D,
Conv2DTranspose, Lambda,
concatenate, BatchNormalization)
from keras.optimizers import Adam
from src.metrics import (dice, jaccard)
from src.engine import scale_input
class UNet:
def __init__(self,
pre_trained=False, # if True, set weights_path
weights_path=None, # full-path to the pre-trained models_weights
n_classes=None,
input_h=None,
input_w=None,
activation='elu',
kernel_init='he_normal',
model_name=None
):
self.pre_trained = pre_trained
self.weights_path = weights_path
self.n_classes = n_classes
self.input_h = input_h
self.input_w = input_w
self.activation = activation
self.kernel_init = kernel_init
self.model_name = model_name
# Build U-Net: original paper
def build(self):
# ======================================== INPUT ==========================================
inBlock = Input(shape=(self.input_h, self.input_w, 3), dtype='float32')
# Lambda layer: scale input before feeding to the network
inScaled = Lambda(lambda x: scale_input(x))(inBlock)
# ======================================== ENCODER ========================================
# Block 1d
convB1d = Conv2D(64, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(inScaled)
convB1d = BatchNormalization()(convB1d)
convB1d = Conv2D(64, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB1d)
convB1d = BatchNormalization()(convB1d)
poolB1d = MaxPooling2D(pool_size=(2, 2))(convB1d)
# Block 2d
convB2d = Conv2D(128, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(poolB1d)
convB2d = BatchNormalization()(convB2d)
convB2d = Conv2D(128, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB2d)
convB2d = BatchNormalization()(convB2d)
poolB2d = MaxPooling2D(pool_size=(2, 2))(convB2d)
# Block 3d
convB3d = Conv2D(256, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(poolB2d)
convB3d = BatchNormalization()(convB3d)
convB3d = Conv2D(256, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB3d)
convB3d = BatchNormalization()(convB3d)
poolB3d = MaxPooling2D(pool_size=(2, 2))(convB3d)
# Block 4d
convB4d = Conv2D(512, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(poolB3d)
convB4d = BatchNormalization()(convB4d)
convB4d = Conv2D(512, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB4d)
convB4d = BatchNormalization()(convB4d)
poolB4d = MaxPooling2D(pool_size=(2, 2))(convB4d)
# ===================================== BOTTLENECK ======================================
convBn = Conv2D(1024, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(poolB4d)
convBn = BatchNormalization()(convBn)
convBn = Conv2D(512, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convBn)
convBn = BatchNormalization()(convBn)
# ====================================== DECODER =======================================
# Block 4u
convB4u = Conv2DTranspose(512, (2, 2), strides=(2, 2), padding='same')(convBn)
convB4u = concatenate([convB4u, convB4d])
convB4u = Conv2D(512, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB4u)
convB4u = BatchNormalization()(convB4u)
convB4u = Conv2D(256, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB4u)
convB4u = BatchNormalization()(convB4u)
# Block 3u
convB3u = Conv2DTranspose(256, (2, 2), strides=(2, 2), padding='same')(convB4u)
convB3u = concatenate([convB3u, convB3d])
convB3u = Conv2D(256, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB3u)
convB3u = BatchNormalization()(convB3u)
convB3u = Conv2D(128, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB3u)
convB3u = BatchNormalization()(convB3u)
# Block B2u
convB2u = Conv2DTranspose(128, (2, 2), strides=(2, 2), padding='same')(convB3u)
convB2u = concatenate([convB2u, convB2d])
convB2u = Conv2D(128, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB2u)
convB2u = BatchNormalization()(convB2u)
convB2u = Conv2D(64, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB2u)
convB2u = BatchNormalization()(convB2u)
# Block B1u
convB1u = Conv2DTranspose(64, (2, 2), strides=(2, 2), padding='same')(convB2u)
convB1u = concatenate([convB1u, convB1d], axis=3)
convB1u = Conv2D(64, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB1u)
convB1u = BatchNormalization()(convB1u)
convB1u = Conv2D(64, (3, 3), activation=self.activation, kernel_initializer=self.kernel_init, padding='same')(convB1u)
convB1u = BatchNormalization()(convB1u)
# ======================================== OUTPUT ==========================================
if self.n_classes == 2:
outBlock = Conv2D(1, (1, 1), activation='sigmoid', padding='same')(convB1u)
else:
outBlock = Conv2D(self.n_classes, (1, 1), activation='softmax', padding='same')(convB1u)
# Create model
model = Model(inputs=inBlock, outputs=outBlock, name=self.model_name)
model.compile(optimizer=Adam(),
loss="categorical_crossentropy",
metrics=[dice, jaccard, ]
)
# Load models_weights if pre-trained
if self.pre_trained:
if os.path.exists(self.weights_path):
model.load_weights(self.weights_path)
else:
raise Exception(f'Failed to load weights at {self.weights_path}')
return model