Я разрабатываю сверточный автоэнкодер с Tensorflow 2.1.
Это код
class ConvAutoencoder:
def __init__(self, input_shape, latent_dim):
self.input_shape = input_shape
self.latent_dim = latent_dim
self.__create_model()
def __create_model(self):
# Define Encoder
encoder_input = Input(shape=self.input_shape, name='encoder_input')
x = Conv2D(filters=16, kernel_size=5, activation='relu', padding='same')(encoder_input)
x = Conv2D(filters=32, kernel_size=3, strides=2, activation='relu', padding='same')(x)
x = Conv2D(filters=64, kernel_size=3, strides=2, activation='relu', padding='same')(x)
x = Conv2D(filters=128, kernel_size=2, strides=2, activation='relu', padding='same')(x)
last_conv_shape = x.shape
x = Flatten()(x)
x = Dense(256, activation='relu')(x)
x = Dense(units=self.latent_dim, name='encoded_rep')(x)
self.encoder = Model(encoder_input, x, name='encoder_model')
self.encoder.summary()
# Define Decoder
decoder_input = Input(shape=self.latent_dim, name='decoder_input')
x = Dense(units=256)(decoder_input)
x = Dense(units=(last_conv_shape[1] * last_conv_shape[2] * last_conv_shape[3]), activation='relu')(x)
x = Reshape(target_shape=(last_conv_shape[1], last_conv_shape[2], last_conv_shape[3]))(x)
x = Conv2DTranspose(filters=128, kernel_size=2, activation='relu', padding='same')(x)
x = Conv2DTranspose(filters=64, kernel_size=3, strides=2, activation='relu', padding='same')(x)
x = Conv2DTranspose(filters=32, kernel_size=3, strides=2, activation='relu', padding='same')(x)
x = Conv2DTranspose(filters=16, kernel_size=5, strides=2, activation='relu', padding='same')(x)
x = Conv2DTranspose(filters=self.input_shape[2], kernel_size=5, activation='sigmoid', padding='same')(x)
self.decoder = Model(decoder_input, x, name='decoder_model')
self.decoder.summary()
# Define Autoencoder from encoder input to decoder output
self.autoencoder = Model(encoder_input, self.decoder(self.encoder(encoder_input)))
self.optimizer = Adam()
self.autoencoder.summary()
@tf.function
def compute_loss(model, batch):
decoded = model.autoencoder(batch)
return tf.reduce_mean(tf.reduce_sum(tf.square(batch - decoded), axis=[1, 2, 3]))
@tf.function
def train(train_data, model, epochs=2, batch_size=32):
for epoch in range(epochs):
for i in tqdm(range(0, len(train_data), batch_size)):
batch = train_data[i: i + batch_size]
with tf.GradientTape() as tape:
loss = compute_loss(model, batch)
gradients = tape.gradient(loss, model.autoencoder.trainable_variables)
model.optimizer.apply_gradients(zip(gradients, model.autoencoder.trainable_variables))
if __name__ == "__main__":
img_dim = 64
channels = 1
(x_train, _), (x_test, _) = mnist.load_data()
# Resize images to (img_dim x img_dim)
x_train = np.array([cv2.resize(img, (img_dim, img_dim)) for img in x_train])
x_test = np.array([cv2.resize(img, (img_dim, img_dim)) for img in x_test])
# Normalize images
x_train = x_train.astype('float32') / 255.
x_test = x_test.astype('float32') / 255.
# Reshape datasets for tensorflow
x_train = x_train.reshape((-1, img_dim, img_dim, channels))
x_test = x_test.reshape((-1, img_dim, img_dim, channels))
# Create autoencoder and fit the model
autoenc = ConvAutoencoder(input_shape=(img_dim, img_dim, channels), latent_dim=4)
# Train autoencoder
train(train_data=x_train, model=autoenc, epochs=2, batch_size=32)
Теперь две проблемы:
- функция
train()
, помеченная @tf.function
, вызывается дважды. Этого не происходит без метки @tf.function
- Каждая эпоха обучения увеличивает потребление памяти примерно на 3 ГБ
Что я делаю не так?
Другое информация:
- Версия Tensorflow: 2.1.0
- Python версия 3.7.5
- Tensorflow не использует графический процессор, так как у меня все еще есть проблемы с драйверами
Больше нечего сказать, но StackOverflow заставляет меня что-то написать