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fcn_senet.py
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fcn_senet.py
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from tensorflow.keras.layers import Input, Conv2D, Reshape,MaxPooling2D, Conv2DTranspose, Add,Dense, GlobalAveragePooling2D, multiply
from tensorflow.keras.models import Model, Sequential
import tensorflow.keras.backend as K
import tensorflow as tf
from tensorflow.keras.regularizers import l2
input_shape = (96,96,1)
#input_shape = (256,256,1)
Nkeypoints = 15
def squeeze_excite_block(tensor, n_filters, ratio=16):
init = tensor
channel_axis = 1 if K.image_data_format() == "channels_first" else -1
filters = n_filters
se_shape = (1, 1, filters)
se = GlobalAveragePooling2D()(init)
se = Reshape(se_shape)(se)
se = Dense(filters // ratio, activation='relu', kernel_initializer='he_normal', use_bias=False)(se)
se = Dense(filters, activation='sigmoid', kernel_initializer='he_normal', use_bias=False)(se)
if K.image_data_format() == 'channels_first':
se = Permute((3, 1, 2))(se)
x = multiply([init, se])
return x
def model(input_shape):
H = input_shape[0]
W = input_shape[1]
def conv_block(x, nconvs, n_filters, block_name, wd=None):
for i in range(nconvs):
x = Conv2D(n_filters, kernel_size=(3, 3), strides=1, padding='same', activation='relu',
kernel_regularizer=wd, name=block_name + "_conv" + str(i + 1))(x)
x = squeeze_excite_block(x, n_filters)
x = MaxPooling2D(pool_size=(2, 2), strides=2, padding='valid', name=block_name + "_pool")(x)
#x = Dropout(0.2)(x)#added to check improve val acc---no improve
return x
input = Input(shape=input_shape, name="Input")
# Block 1
x = conv_block(input, nconvs=2, n_filters=64, block_name="block1")
# Block 2
x = conv_block(x, nconvs=2, n_filters=128, block_name="block2")
# Block 3
pool3 = conv_block(x, nconvs=3, n_filters=256, block_name="block3")
# Block 4
pool4 = conv_block(pool3, nconvs=3, n_filters=512, block_name="block4")
# Block 5
x = conv_block(pool4, nconvs=3, n_filters=512, block_name="block5")
# convolution 6
x = Conv2D(4096, kernel_size=(1, 1), strides=1, padding="same", activation="relu", name="conv6")(x)
# convolution 7
x = Conv2D(15, kernel_size=(1, 1), strides=1, padding="same", activation="relu", name="conv7")(x)
# upsampling
preds_pool3 = Conv2D(15, kernel_size=(1, 1), strides=1, padding="same", name="preds_pool3")(pool3)
preds_pool4 = Conv2D(15, kernel_size=(1, 1), strides=1, padding="same", name="preds_pool4")(pool4)
up_pool4 = Conv2DTranspose(filters=15, kernel_size=2, strides=2, activation="relu", name="ConvT_pool4")(preds_pool4)
up_conv7 = Conv2DTranspose(filters=15, kernel_size=4, strides=4, activation="relu", name="ConvT_conv7")(x)
fusion = Add()([preds_pool3, up_pool4, up_conv7])
output = Conv2DTranspose(filters=15, kernel_size=8, strides=8, activation='relu', name="convT_fusion")(fusion)
output = Conv2D(15, kernel_size=(1, 1), strides=1, padding="same", activation="linear", name="output")(output)
#output = Reshape(target_shape=(H * W * Nkeypoints, 1))(output)
model = Model(inputs=input, outputs=output, name="FCN8")
model.summary()
return model
if __name__=="__main__":
model(input_shape)