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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) | |