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__author__ = 'Taneem Jan, improved the old model through pretrained Auto-encoders'
from keras.layers import Input, Dense, Dropout, RepeatVector, LSTM, concatenate, Flatten
from keras.models import Sequential, Model
from tensorflow.keras.optimizers import RMSprop
from .Config import *
from .AModel import *
from .autoencoder_image import *
class Main_Model(AModel):
def __init__(self, input_shape, output_size, output_path):
AModel.__init__(self, input_shape, output_size, output_path)
self.name = "Main_Model"
visual_input = Input(shape=input_shape)
# Load the pre-trained autoencoder model
autoencoder_model = autoencoder_image(input_shape, input_shape, output_path)
autoencoder_model.load('autoencoder')
path = "classes/model/bin/"
path_to_autoencoder = "{}autoencoder.h5".format(path)
autoencoder_model.model.load_weights(path_to_autoencoder)
# Get only the model up to the encoded part
hidden_layer_model_freeze = Model(
inputs=autoencoder_model.model.input,
outputs=autoencoder_model.model.get_layer('encoded_layer').output
)
hidden_layer_input = hidden_layer_model_freeze(visual_input)
# Additional layers before concatenation
hidden_layer_model = Flatten()(hidden_layer_input)
hidden_layer_model = Dense(1024, activation='relu')(hidden_layer_model)
hidden_layer_model = Dropout(0.3)(hidden_layer_model)
hidden_layer_model = Dense(1024, activation='relu')(hidden_layer_model)
hidden_layer_model = Dropout(0.3)(hidden_layer_model)
hidden_layer_result = RepeatVector(CONTEXT_LENGTH)(hidden_layer_model)
# Making sure the loaded hidden_layer_model_freeze will no longer be updated
for layer in hidden_layer_model_freeze.layers:
layer.trainable = False
# The same language model that of pix2code by Tony Beltramelli
language_model = Sequential()
language_model.add(LSTM(128, return_sequences=True, input_shape=(CONTEXT_LENGTH, output_size)))
language_model.add(LSTM(128, return_sequences=True))
textual_input = Input(shape=(CONTEXT_LENGTH, output_size))
encoded_text = language_model(textual_input)
decoder = concatenate([hidden_layer_result, encoded_text])
decoder = LSTM(512, return_sequences=True)(decoder)
decoder = LSTM(512, return_sequences=False)(decoder)
decoder = Dense(output_size, activation='softmax')(decoder)
self.model = Model(inputs=[visual_input, textual_input], outputs=decoder)
optimizer = RMSprop(learning_rate=0.0001, clipvalue=1.0)
self.model.compile(loss='categorical_crossentropy', optimizer=optimizer)
def fit_generator(self, generator, steps_per_epoch):
# self.model.summary()
self.model.fit_generator(generator, steps_per_epoch=steps_per_epoch, epochs=EPOCHS, verbose=1)
self.save()
def predict(self, image, partial_caption):
return self.model.predict([image, partial_caption], verbose=0)[0]
def predict_batch(self, images, partial_captions):
return self.model.predict([images, partial_captions], verbose=1)
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