classes/model/autoencoder_image.py

__author__ = 'Taneem Jan, improved the old model through pretrained Auto-encoders'

from keras.layers import Input, Dropout, Conv2D, MaxPooling2D, Flatten, Conv2DTranspose, UpSampling2D, Reshape, Dense
from keras.models import Sequential, Model
# from keras.optimizers import RMSprop
from tensorflow.keras.optimizers import RMSprop
from keras import *
from .Config import *
from .AModel import *


class autoencoder_image(AModel):
	def __init__(self, input_shape, output_size, output_path):
		AModel.__init__(self, input_shape, output_size, output_path)
		self.name = 'autoencoder'

		input_image = Input(shape=input_shape)
		encoder = Conv2D(32, 3, padding='same', activation='relu')(input_image)
		encoder = Conv2D(32, 3, padding='same', activation='relu')(encoder)
		encoder = MaxPooling2D()(encoder)
		encoder = Dropout(0.25)(encoder)

		encoder = Conv2D(64, 3, padding='same', activation='relu')(encoder)
		encoder = Conv2D(64, 3, padding='same', activation='relu')(encoder)
		encoder = MaxPooling2D()(encoder)
		encoder = Dropout(0.25)(encoder)

		encoder = Conv2D(128, 3, padding='same', activation='relu')(encoder)
		encoder = Conv2D(128, 3, padding='same', activation='relu')(encoder)
		encoder = MaxPooling2D()(encoder)
		encoded = Dropout(0.25, name='encoded_layer')(encoder)

		decoder = Conv2DTranspose(128, 3, padding='same', activation='relu')(encoded)
		decoder = Conv2DTranspose(128, 3, padding='same', activation='relu')(decoder)
		decoder = UpSampling2D()(decoder)
		decoder = Dropout(0.25)(decoder)

		decoder = Conv2DTranspose(64, 3, padding='same', activation='relu')(decoder)
		decoder = Conv2DTranspose(64, 3, padding='same', activation='relu')(decoder)
		decoder = UpSampling2D()(decoder)
		decoder = Dropout(0.25)(decoder)

		decoder = Conv2DTranspose(32, 3, padding='same', activation='relu')(decoder)
		decoder = Conv2DTranspose(3, 3, padding='same', activation='relu')(decoder)
		decoder = UpSampling2D()(decoder)
		decoded = Dropout(0.25)(decoder)

		# decoder = Dense(256*256*3)(decoder)
		# decoded = Reshape(target_shape=input_shape)(decoder)

		self.model = Model(input_image, decoded)
		self.model.compile(optimizer='adadelta', loss='binary_crossentropy')
		# self.model.summary()

	def fit_generator(self, generator, steps_per_epoch):
		self.model.fit_generator(generator, steps_per_epoch=steps_per_epoch, epochs=EPOCHS, verbose=1)
		self.save()

	def predict_hidden(self, images):
		hidden_layer_model = Model(inputs = self.input, outputs = self.get_layer('encoded_layer').output)
		return hidden_layer_model.predict(images)