def create_hyper_model(hp):
global count_models
# reset keras global state (hopefully releasing memory)
tf.keras.backend.clear_session()
gc.collect()
count_models = count_models + 1
# encoder-decoder dimensions must be equal
rnn_dim = hp.Choice('rnn_dim', [512])
enc_dropout = hp.Float('enc_dropout', min_value=0.4, max_value=0.7, step=0.1)
dec_dropout = hp.Float('dec_dropout', min_value=0.4, max_value=0.7, step=0.1)
cont_dim = hp.Choice('cont_dim', [20, 50, 120, 200, 400])
mu_force = 1.2 #hp.Choice('mu_force', [0.5, 1.2, 2.5, 5.0])
t_gumbel = hp.Choice('t_gumbel', [0.0005, 0.001, 0.02, 0.1])
style_dim = hp.Choice('style_dim', [20, 80, 150, 300])
kl_reg = hp.Choice('kl_reg', [0.2, 0.5, 0.8, 0.9])
beta_steps = hp.Choice('beta_anneal_steps', [2500, 5000])
attention = hp.Choice('attention', [0, 128, 256, 512])
lr = hp.Choice('lr', [5e-4, 5.5e-4, 6e-4, 8e-4, 1e-3])
decay = hp.Choice('decay', [0.85, 0.93, 0.95, 0.97])
decay_steps = hp.Choice('decay_steps', [2500])
rnn_type = hp.Choice('rnn_type', ["lstm", "gru"])
# rnn_dim = hp.Choice('rnn_dim', [512])
# enc_dropout = hp.Choice('enc_dropout', [0.5])
# dec_dropout = hp.Choice('dec_dropout', [0.2])
# cont_dim = hp.Choice('cont_dim', [120])
# mu_force = 1.3
# t_gumbel = hp.Choice('t_gumbel', [0.02])
# style_dim = hp.Choice('style_dim', [80])
# kl_reg = hp.Choice('kl_reg', [0.8])
# beta_steps = hp.Choice('beta_anneal_steps', [2500])
# attention = hp.Choice('attention', [128])
# lr = hp.Choice('lr', [5e-4])
# decay = hp.Choice('decay', [0.85])
# decay_steps = hp.Choice('decay_steps', [2500])
# rnn_type = hp.Choice('rnn_type', ["lstm"])
vae = MVAE(x_depth=x_depth,
enc_rnn_dim=rnn_dim, enc_dropout=enc_dropout,
dec_rnn_dim=rnn_dim, dec_dropout=dec_dropout,
cont_dim=cont_dim, cat_dim=cat_dim, mu_force=mu_force,
t_gumbel=t_gumbel, style_embed_dim=style_dim,
kl_reg=kl_reg,
beta_anneal_steps=beta_steps,
rnn_type=rnn_type, attention=attention)
schedule = tf.keras.optimizers.schedules.ExponentialDecay(lr, decay_steps, decay, staircase=False)
optimizer = tfk.optimizers.Adam(learning_rate=schedule)
vae.compile(optimizer=optimizer)
vae.run_eagerly = True
# enable annealing
vae.set_kl_anneal(True)
return vae
def create_model_and_train(train_segments,
test_segments,
x_depth,
batch_size,
enc_rnn_dim,
dec_rnn_dim,
enc_dropout,
dec_dropout,
cont_dim,
cat_dim,
mu_force,
t_gumbel,
style_embed_dim,
kl_reg,
beta_anneal_steps,
rnn_type,
attention,
save_path,
start_epoch,
final_epoch,
weights=None):
train_iterator = load_noteseqs(train_segments, x_depth,
batch_size).get_iterator()
test_iterator = load_noteseqs(test_segments, x_depth,
batch_size).get_iterator()
vae = MVAE(x_depth=x_depth,
enc_rnn_dim=enc_rnn_dim,
enc_dropout=enc_dropout,
dec_rnn_dim=dec_rnn_dim,
dec_dropout=dec_dropout,
cont_dim=cont_dim,
cat_dim=cat_dim,
mu_force=mu_force,
t_gumbel=t_gumbel,
style_embed_dim=style_embed_dim,
kl_reg=kl_reg,
beta_anneal_steps=beta_anneal_steps,
rnn_type=rnn_type,
attention=attention)
optimizer = tfk.optimizers.Adam(learning_rate=5e-4)
vae.compile(optimizer=optimizer)
vae.run_eagerly = True
save_path = save_path
if (os.path.exists(save_path) == False):
os.makedirs(save_path)
callbacks = [
tfk.callbacks.LambdaCallback(
on_epoch_end=lambda epoch, _: generate_and_save_samples(
vae, epoch, save_path, cat_dim)),
tfk.callbacks.LambdaCallback(
on_epoch_start=lambda epoch, _: vae.reset_trackers()),
tfk.callbacks.EarlyStopping(monitor='val_p_acc',
min_delta=0.01,
patience=5,
mode='max'),
tfk.callbacks.CSVLogger(save_path + 'log.csv', append=True),
tfk.callbacks.ModelCheckpoint(save_path + 'weights/' +
'/weights.{epoch:02d}',
monitor='val_p_acc',
save_weights_only=True,
save_best_only=True,
mode='max'),
tfk.callbacks.TensorBoard(log_dir=save_path,
write_graph=True,
update_freq='epoch',
histogram_freq=40,
profile_batch='10,20')
]
if weights != None:
vae.load_weights(save_path + weights)
history = vae.fit(train_iterator,
epochs=final_epoch,
initial_epoch=start_epoch,
callbacks=callbacks,
validation_data=test_iterator)
vae.save_weights(save_path + 'weights/weights-final')
return history
enc_rnn_dim=args["enc_rnn_dim"],
enc_dropout=args["enc_dropout"],
dec_rnn_dim=args["dec_rnn_dim"],
dec_dropout=args["dec_dropout"],
cont_dim=args["cont_dim"],
cat_dim=args["cat_dim"],
mu_force=args["mu_force"],
t_gumbel=args["t_gumbel"],
style_embed_dim=args["style_embed_dim"],
kl_reg=args["kl_reg"],
beta_anneal_steps=args["kl_anneal"],
rnn_type=rnn_type,
attention=attention)
optimizer = tfk.optimizers.Adam(learning_rate=5e-4)
vae.compile(optimizer=optimizer)
vae.run_eagerly = True
now = datetime.now()
save_path = args["save_path"]
# copy configuration file in model directory
if (os.path.exists(save_path) == False):
os.makedirs(save_path)
copyfile(config_file, save_path + 'train.conf')
with open(save_path + 'model.txt', 'w') as f:
vae.model().summary(print_fn=lambda x: f.write(x + '\n'))
# register handler for Ctrl+C in order to save final weights
signal.signal(signal.SIGINT, signal_handler)