test_list = [data_prep(s) for s in val_samples]
train_dataset = Dataset(samples=train_samples,
preprocessor=data_prep,
batch_size=config['batch_size'],
mel_channels=config['mel_channels'],
shuffle=True)
val_dataset = Dataset(samples=val_samples,
preprocessor=data_prep,
batch_size=config['batch_size'],
mel_channels=config['mel_channels'],
shuffle=False)
# create logger and checkpointer and restore latest model
summary_manager = SummaryManager(model=model,
log_dir=config_manager.log_dir,
config=config)
checkpoint = tf.train.Checkpoint(step=tf.Variable(1),
optimizer=model.optimizer,
net=model)
manager = tf.train.CheckpointManager(
checkpoint,
str(config_manager.weights_dir),
max_to_keep=config['keep_n_weights'],
keep_checkpoint_every_n_hours=config['keep_checkpoint_every_n_hours'])
checkpoint.restore(manager.latest_checkpoint)
if manager.latest_checkpoint:
print(
f'\nresuming training from step {model.step} ({manager.latest_checkpoint})'
)
else:
with open(str(train_predictions_dir / f'{c}_batch_prediction.npy'),
'wb') as file:
pickle.dump(batch, file)
train_batches.append(batch)
else:
val_batches = [
batch_file for batch_file in val_predictions_dir.iterdir()
if batch_file.suffix == '.npy'
]
train_batches = [
batch_file for batch_file in train_predictions_dir.iterdir()
if batch_file.suffix == '.npy'
]
summary_manager = SummaryManager(model=model,
log_dir=config_manager.log_dir / writer_tag,
config=config,
default_writer=writer_tag)
# TODO: not clean, here val/train _batches can be either the actual batches, or the file names.
iterator = tqdm(enumerate(val_batches))
all_val_durations = np.array([])
new_alignments = []
total_val_samples = 0
for c, batch_file in iterator:
iterator.set_description(f'Extracting validation alignments')
if not running_predictions:
val_mel, val_text, val_alignments = np.load(str(batch_file),
allow_pickle=True)
else:
val_mel, val_text, val_alignments = batch_file
def train():
print_config()
model = get_model(train=True)
lr = FLAGS['learning_rate']
model._compile(optimizer=tf.keras.optimizers.Adam(
lr, beta_1=0.9, beta_2=0.98, epsilon=1e-9))
if not os.path.isfile(FLAGS['learning_rate_path']):
try:
with open(FLAGS['learning_rate_path'], 'w+') as f:
f.write(str(FLAGS['learning_rate']))
except:
print("Could not create learning rate backup %s" %
FLAGS['learning_rate_path'])
traceback.print_exc()
sys.exit(1)
if not os.path.isfile(FLAGS['epoch_path']):
try:
with open(FLAGS['epoch_path'], 'w+') as f:
f.write(str(0))
except:
print("Could not create epoch count file %s" % FLAGS['epoch_path'])
traceback.print_exc()
sys.exit(1)
try:
if not os.path.exists(FLAGS['weights_dir']):
os.makedirs(FLAGS['weights_dir'])
except:
print("Could not weights folder %s that contains model "
"directories for trained weights " % FLAGS['weights_dir'])
traceback.print_exc()
sys.exit(1)
checkpoint = tf.train.Checkpoint(step=tf.Variable(0),
optimizer=model.optimizer,
net=model)
manager = tf.train.CheckpointManager(
checkpoint,
str(FLAGS['weights_dir']), #### remaining #### ##done##
max_to_keep=FLAGS['keep_n_weights'],
keep_checkpoint_every_n_hours=FLAGS['keep_checkpoint_every_n_hours'])
summary_manager = SummaryManager(model=model,
log_dir=FLAGS['train_dir'],
config=FLAGS)
checkpoint.restore(manager.latest_checkpoint)
if manager.latest_checkpoint:
print(
f'\nresuming training from step {model.step} ({manager.latest_checkpoint})'
)
try:
with open(FLAGS['learning_rate_path'], 'r') as f:
lr = float(f.readlines()[0])
print("Successfully loaded learning rate.")
except:
print("Could not load learning rate file %s" %
FLAGS['learning_rate_path'])
traceback.print_exc()
sys.exit(1)
else:
print(f'\nStarting training from scratch ...')
if FLAGS['debug'] is True:
print('\nWARNING: DEBUG is set to True. Training in eager mode.')
print('\nTRAINING...')
train_data = data_utils.read_and_bucket_data(
os.path.join(FLAGS['data_dir'], "train.pkl"))
dev_set = data_utils.read_and_bucket_data(
os.path.join(FLAGS['data_dir'], "dev.pkl"))
train_dataset = Dataset(train_data[0],
FLAGS['batch_size'],
isTraining=True,
bucket_id=None,
drop_remainder=True)
temp = []
val_wer_window = []
window_size = 3
validation_improvement_threshold = FLAGS[
'valid_thresh'] # per_threshold for validation improvement
step_time, loss = 0.0, 0.0
#previous_losses = []
steps_done = model.step
val_losses = []
if steps_done > 0: ## remaining## ##done##
# The model saved would have wer and per better than 1.0
best_wer, _ = calc_levenshtein_loss(model,
dev_set) ## remaining## ##done##
else:
best_wer = 1.0
# _ = train_dataset.next_batch()
epoch_id = train_dataset.epoch #remaining#
t = trange(
model.step, FLAGS['max_steps'], leave=True
) ## implement model.epoch #### replace 3 with model.epoch# ##done##
c = epoch_id
steps = 0
for _ in t:
#current_temp = subprocess.check_output(['nvidia-smi','--query-gpu=temperature.gpu','--format=csv,noheader'])
t.set_description(f'Step {model.step}')
#batch_data = data_utils.batch_bucketed_data(train_data, FLAGS['batch_size'])
#for batch in tqdm.tqdm(batch_data):
#start_time = time.time()
encoder_inputs, seq_len, decoder_inputs, seq_len_target = train_dataset.next_batch(
) #model.get_batch(batch) ## to be implemented ## ## done ##
model_out = model.train_step(encoder_inputs, seq_len, decoder_inputs,
seq_len_target) ## remaining ## ##done##
step_loss = model_out['loss']
loss += step_loss
steps += 1
t.display(f'epoch : {train_dataset.epoch}', pos=2)
if model.step % FLAGS['train_images_plotting_frequency'] == 0:
summary_manager.display_attention_heads(model_out,
tag='TrainAttentionHeads')
#model.increment_epoch()
if c + 1 == train_dataset.epoch: #change in epoch
c = train_dataset.epoch
loss /= steps
summary_manager.display_scalar(tag='Meta/epoch',
scalar_value=c,
plot_all=True)
summary_manager.display_loss(loss, tag='Train', plot_all=True)
#summary_manager.display_loss(loss, tag='Validation', plot)
perplexity = np.exp(loss) if loss < 300 else float('inf')
t.display("Epoch %d"
" perplexity %.4f" % (train_dataset.epoch, perplexity),
pos=3)
steps = 0
loss = 0
# Calculate validation result
val_wer, val_per, val_loss = calc_levenshtein_loss(
model,
dev_set,
summary_manager=summary_manager,
step=model.step)
val_losses.append(val_per)
summary_manager.display_loss(val_loss,
tag='Validation-loss',
plot_all=True)
summary_manager.display_loss(perplexity,
tag='Validation-perplexity',
plot_all=True)
summary_manager.display_loss(val_per,
tag='Validation-per',
plot_all=True)
summary_manager.display_loss(val_wer,
tag='Validation-wer',
plot_all=True)
summary_manager.display_scalar(tag='Meta/learning_rate',
scalar_value=model.optimizer.lr,
plot_all=True)
#validation_improvement_threshold
t.display("Validation WER: %.5f, PER: %.5f" % (val_wer, val_per),
pos=4)
if len(val_losses) >= 50:
global_avg = sum(val_losses[-50:]) / 50.0
last_10_avg = sum(val_losses[-10:]) / 10.0
if global_avg - last_10_avg < validation_improvement_threshold:
lr *= 0.2
t.display("Learning rate updated.", pos=5)
model.set_constants(learning_rate=lr)
with open(FLAGS['learning_rate_path'], 'w') as f:
f.write(str(lr))
# Validation WER is a moving window, we add the new entry and pop the oldest one
val_wer_window.append(val_wer) ## confirm from this paper
if len(val_wer_window) > window_size:
val_wer_window.pop(0)
avg_wer = sum(val_wer_window) / float(len(val_wer_window))
t.display("Average Validation WER %.5f" % (avg_wer), pos=6)
# The best model is decided based on average validation WER to remove noisy cases of one off validation success
if best_wer > avg_wer: ## saving criteria is different ## #done
# Save the best model
best_wer = avg_wer
t.display("Saving Updated Model", pos=7)
save_path = manager.save()
print()