def main(args):
model_dir = os.path.dirname(os.path.realpath(args.checkpoint))
hparams = model_utils.load_hparams(model_dir)
encode_fn, tok_to_text, vocab_size = encoding.get_encoder(
encoder_dir=model_dir, hparams=hparams)
hparams[HP_VOCAB_SIZE.name] = vocab_size
model = build_keras_model(hparams)
model.load_weights(args.checkpoint)
audio, sr = preprocessing.tf_load_audio(args.input)
log_melspec = preprocessing.preprocess_audio(audio=audio,
sample_rate=sr,
hparams=hparams)
log_melspec = tf.expand_dims(log_melspec, axis=0)
decoder_fn = decoding.greedy_decode_fn(model, hparams)
decoded = decoder_fn(log_melspec)[0]
transcription = tok_to_text(decoded)
print('Transcription:', transcription.numpy().decode('utf8'))
def main(args):
model_dir = os.path.dirname(os.path.realpath(args.checkpoint))
hparams = model_utils.load_hparams(model_dir)
encode_fn, tok_to_text, vocab_size = encoding.load_encoder(model_dir,
hparams=hparams)
hparams[HP_VOCAB_SIZE.name] = vocab_size
start_token = encode_fn('')[0]
model = build_keras_model(hparams)
model.load_weights(args.checkpoint)
audio, sr = preprocessing.tf_load_audio(args.input)
mel_specs = preprocessing.compute_mel_spectrograms(
audio_arr=audio,
sample_rate=sr,
n_mel_bins=hparams[HP_MEL_BINS.name],
frame_length=hparams[HP_FRAME_LENGTH.name],
frame_step=hparams[HP_FRAME_STEP.name],
hertz_low=hparams[HP_HERTZ_LOW.name],
hertz_high=hparams[HP_HERTZ_HIGH.name])
mel_specs = tf.expand_dims(mel_specs, axis=0)
decoder_fn = decoding.greedy_decode_fn(model,
start_token=start_token)
decoded = decoder_fn(mel_specs)[0]
transcription = tok_to_text(decoded)
print('Transcription:', transcription.numpy().decode('utf8'))
def main(args):
model_dir = os.path.dirname(os.path.realpath(args.checkpoint))
hparams = model_utils.load_hparams(model_dir)
_, tok_to_text, vocab_size = encoding.get_encoder(
encoder_dir=model_dir,
hparams=hparams)
hparams[HP_VOCAB_SIZE.name] = vocab_size
model = build_keras_model(hparams, stateful=True)
model.load_weights(args.checkpoint)
decoder_fn = decoding.greedy_decode_fn(model, hparams)
p = pyaudio.PyAudio()
def listen_callback(in_data, frame_count, time_info, status):
global LAST_OUTPUT
audio = tf.io.decode_raw(in_data, out_type=tf.float32)
log_melspec = preprocessing.preprocess_audio(
audio=audio,
sample_rate=SAMPLE_RATE,
hparams=hparams)
log_melspec = tf.expand_dims(log_melspec, axis=0)
decoded = decoder_fn(log_melspec)[0]
transcription = LAST_OUTPUT + tok_to_text(decoded)\
.numpy().decode('utf8')
if transcription != LAST_OUTPUT:
LAST_OUTPUT = transcription
print(transcription)
return in_data, pyaudio.paContinue
stream = p.open(
format=pyaudio.paFloat32,
channels=NUM_CHANNELS,
rate=SAMPLE_RATE,
input=True,
frames_per_buffer=CHUNK_SIZE,
stream_callback=listen_callback)
print('Listening...')
stream.start_stream()
while stream.is_active():
time.sleep(0.1)
stream.stop_stream()
stream.close()
p.terminate()
def load_model(model_dir, vocab_size, hparams, training=True):
model, loss_fn = build_keras_model(vocab_size, hparams, training=training)
epochs_r = re.compile(r'model.\d+-')
newest_weights = max(filter(epochs_r.findall, os.listdir(model_dir)))
model.load_weights(os.path.join(model_dir, newest_weights))
logging.info('Restored weights from {}.'.format(newest_weights))
return model, loss_fn
def train():
hparams = {
# Preprocessing
HP_MEL_BINS: HP_MEL_BINS.domain.values[0],
HP_FRAME_LENGTH: HP_FRAME_LENGTH.domain.values[0],
HP_FRAME_STEP: HP_FRAME_STEP.domain.values[0],
HP_HERTZ_LOW: HP_HERTZ_LOW.domain.values[0],
HP_HERTZ_HIGH: HP_HERTZ_HIGH.domain.values[0],
# Model
HP_EMBEDDING_SIZE: HP_EMBEDDING_SIZE.domain.values[0],
HP_ENCODER_LAYERS: HP_ENCODER_LAYERS.domain.values[0],
HP_ENCODER_SIZE: HP_ENCODER_SIZE.domain.values[0],
HP_TIME_REDUCT_INDEX: HP_TIME_REDUCT_INDEX.domain.values[0],
HP_TIME_REDUCT_FACTOR: HP_TIME_REDUCT_FACTOR.domain.values[0],
HP_PRED_NET_LAYERS: HP_PRED_NET_LAYERS.domain.values[0],
HP_JOINT_NET_SIZE: HP_JOINT_NET_SIZE.domain.values[0],
HP_SOFTMAX_SIZE: HP_SOFTMAX_SIZE.domain.values[0],
HP_LEARNING_RATE: HP_LEARNING_RATE.domain.values[0]
}
vocab = vocabulary.init_vocab()
vocab_table = preprocessing.build_lookup_table(vocab, default_value=0)
vocab_size = len(vocab)
logging.info('Vocabulary size: {}'.format(vocab_size))
dataset_fn = get_dataset_fn(FLAGS.data_dir,
vocab_table=vocab_table,
batch_size=FLAGS.batch_size,
hparams=hparams)
train_dataset, train_steps = dataset_fn('train')
dev_dataset, dev_steps = dataset_fn('dev')
model, loss_fn = build_keras_model(vocab_size, hparams)
optimizer = tf.keras.optimizers.Adam(hparams[HP_LEARNING_RATE])
model.compile(loss=loss_fn,
optimizer=optimizer,
experimental_run_tf_function=False)
os.makedirs(FLAGS.model_dir, exist_ok=True)
checkpoint_fp = os.path.join(FLAGS.model_dir,
'model.{epoch:03d}-{val_loss:.4f}.hdf5')
model.fit(train_dataset,
epochs=FLAGS.n_epochs,
steps_per_epoch=train_steps,
validation_data=dev_dataset,
validation_steps=dev_steps,
callbacks=[
tf.keras.callbacks.TensorBoard(FLAGS.tb_log_dir),
tf.keras.callbacks.ModelCheckpoint(checkpoint_fp)
])
def run(self) -> None:
model = build_keras_model(epochs=100, batch_size=1)
with self.input()["train"].open('r') as train:
training_data = pd.read_csv(train)
x_train = training_data.drop("Survived", axis=1)
y_train = training_data.Survived
model.fit(x_train.values, y_train.values)
with self.input()["test"].open('r') as test:
test_data = pd.read_csv(test)
x_test = test_data.drop("Survived", axis=1)
y_test = test_data.Survived
score = model.score(x_test.values, y_test.values)
print(score)
with self.output()['model'].open('w') as model_out:
model_out.write(model.model.to_yaml())
# Keras won't let us use a buffer as a parameter :c
model.model.save_weights(self.output()['weights'].path)
def train():
hparams = {
HP_TOKEN_TYPE: HP_TOKEN_TYPE.domain.values[0],
HP_VOCAB_SIZE: HP_VOCAB_SIZE.domain.values[0],
# Preprocessing
HP_MEL_BINS: HP_MEL_BINS.domain.values[0],
HP_FRAME_LENGTH: HP_FRAME_LENGTH.domain.values[0],
HP_FRAME_STEP: HP_FRAME_STEP.domain.values[0],
HP_HERTZ_LOW: HP_HERTZ_LOW.domain.values[0],
HP_HERTZ_HIGH: HP_HERTZ_HIGH.domain.values[0],
# Model
HP_EMBEDDING_SIZE: HP_EMBEDDING_SIZE.domain.values[0],
HP_ENCODER_LAYERS: HP_ENCODER_LAYERS.domain.values[0],
HP_ENCODER_SIZE: HP_ENCODER_SIZE.domain.values[0],
HP_TIME_REDUCT_INDEX: HP_TIME_REDUCT_INDEX.domain.values[0],
HP_TIME_REDUCT_FACTOR: HP_TIME_REDUCT_FACTOR.domain.values[0],
HP_PRED_NET_LAYERS: HP_PRED_NET_LAYERS.domain.values[0],
HP_JOINT_NET_SIZE: HP_JOINT_NET_SIZE.domain.values[0],
HP_SOFTMAX_SIZE: HP_SOFTMAX_SIZE.domain.values[0],
HP_LEARNING_RATE: HP_LEARNING_RATE.domain.values[0]
}
if os.path.exists(os.path.join(FLAGS.model_dir, 'hparams.json')):
_hparams = model_utils.load_hparams(FLAGS.model_dir)
encoder_fn, vocab_size = encoding.load_encoder(FLAGS.model_dir,
hparams=_hparams)
model, loss_fn = model_utils.load_model(FLAGS.model_dir,
vocab_size=vocab_size,
hparams=_hparams)
else:
_hparams = {k.name: v for k, v in hparams.items()}
texts_gen = common_voice.texts_generator(FLAGS.data_dir)
encoder_fn, vocab_size = encoding.build_encoder(
texts_gen, model_dir=FLAGS.model_dir, hparams=_hparams)
model, loss_fn = build_keras_model(vocab_size, _hparams)
logging.info('Using {} encoder with vocab size: {}'.format(
_hparams[HP_TOKEN_TYPE.name], vocab_size))
dataset_fn = get_dataset_fn(FLAGS.data_dir,
encoder_fn=encoder_fn,
batch_size=FLAGS.batch_size,
hparams=hparams)
train_dataset, train_steps = dataset_fn('train')
dev_dataset, dev_steps = dataset_fn('dev')
optimizer = tf.keras.optimizers.Adam(_hparams[HP_LEARNING_RATE.name])
model.compile(loss=loss_fn,
optimizer=optimizer,
experimental_run_tf_function=False)
os.makedirs(FLAGS.model_dir, exist_ok=True)
checkpoint_fp = os.path.join(FLAGS.model_dir,
'model.{epoch:03d}-{val_loss:.4f}.hdf5')
model_utils.save_hparams(_hparams, FLAGS.model_dir)
model.fit(train_dataset,
epochs=FLAGS.n_epochs,
steps_per_epoch=train_steps,
validation_data=dev_dataset,
validation_steps=dev_steps,
callbacks=[
tf.keras.callbacks.TensorBoard(FLAGS.tb_log_dir),
tf.keras.callbacks.ModelCheckpoint(checkpoint_fp,
save_weights_only=True)
])
def main(_):
configure_environment(FLAGS.fp16_run)
hparams = {
HP_TOKEN_TYPE: HP_TOKEN_TYPE.domain.values[1],
# Preprocessing
HP_MEL_BINS: HP_MEL_BINS.domain.values[0],
HP_FRAME_LENGTH: HP_FRAME_LENGTH.domain.values[0],
HP_FRAME_STEP: HP_FRAME_STEP.domain.values[0],
HP_HERTZ_LOW: HP_HERTZ_LOW.domain.values[0],
HP_HERTZ_HIGH: HP_HERTZ_HIGH.domain.values[0],
# Model
HP_EMBEDDING_SIZE: HP_EMBEDDING_SIZE.domain.values[0],
HP_ENCODER_LAYERS: HP_ENCODER_LAYERS.domain.values[0],
HP_ENCODER_SIZE: HP_ENCODER_SIZE.domain.values[0],
HP_PROJECTION_SIZE: HP_PROJECTION_SIZE.domain.values[0],
HP_TIME_REDUCT_INDEX: HP_TIME_REDUCT_INDEX.domain.values[0],
HP_TIME_REDUCT_FACTOR: HP_TIME_REDUCT_FACTOR.domain.values[0],
HP_PRED_NET_LAYERS: HP_PRED_NET_LAYERS.domain.values[0],
HP_PRED_NET_SIZE: HP_PRED_NET_SIZE.domain.values[0],
HP_JOINT_NET_SIZE: HP_JOINT_NET_SIZE.domain.values[0],
HP_LEARNING_RATE: HP_LEARNING_RATE.domain.values[0]
}
with tf.summary.create_file_writer(
os.path.join(FLAGS.tb_log_dir, 'hparams_tuning')).as_default():
hp.hparams_config(
hparams=[
HP_TOKEN_TYPE, HP_VOCAB_SIZE, HP_EMBEDDING_SIZE,
HP_ENCODER_LAYERS, HP_ENCODER_SIZE, HP_PROJECTION_SIZE,
HP_TIME_REDUCT_INDEX, HP_TIME_REDUCT_FACTOR,
HP_PRED_NET_LAYERS, HP_PRED_NET_SIZE, HP_JOINT_NET_SIZE
],
metrics=[
hp.Metric(METRIC_ACCURACY, display_name='Accuracy'),
hp.Metric(METRIC_CER, display_name='CER'),
hp.Metric(METRIC_WER, display_name='WER'),
],
)
_hparams = {k.name: v for k, v in hparams.items()}
if len(FLAGS) == 0:
gpus = [
x.name.strip('/physical_device:')
for x in tf.config.experimental.list_physical_devices('GPU')
]
else:
gpus = ['GPU:' + str(gpu_id) for gpu_id in FLAGS.gpus]
strategy = tf.distribute.MirroredStrategy(devices=gpus)
# strategy = None
dtype = tf.float32
if FLAGS.fp16_run:
dtype = tf.float16
# initializer = tf.keras.initializers.RandomUniform(
# minval=-0.1, maxval=0.1)
initializer = None
if FLAGS.checkpoint is not None:
checkpoint_dir = os.path.dirname(os.path.realpath(FLAGS.checkpoint))
_hparams = model_utils.load_hparams(checkpoint_dir)
encoder_fn, idx_to_text, vocab_size = encoding.load_encoder(
checkpoint_dir, hparams=_hparams)
if strategy is not None:
with strategy.scope():
model = build_keras_model(_hparams,
initializer=initializer,
dtype=dtype)
model.load_weights(FLAGS.checkpoint)
else:
model = build_keras_model(_hparams,
initializer=initializer,
dtype=dtype)
model.load_weights(FLAGS.checkpoint)
logging.info('Restored weights from {}.'.format(FLAGS.checkpoint))
else:
os.makedirs(FLAGS.output_dir, exist_ok=True)
shutil.copy(os.path.join(FLAGS.data_dir, 'encoder.subwords'),
os.path.join(FLAGS.output_dir, 'encoder.subwords'))
encoder_fn, idx_to_text, vocab_size = encoding.load_encoder(
FLAGS.output_dir, hparams=_hparams)
_hparams[HP_VOCAB_SIZE.name] = vocab_size
if strategy is not None:
with strategy.scope():
model = build_keras_model(_hparams,
initializer=initializer,
dtype=dtype)
else:
model = build_keras_model(_hparams,
initializer=initializer,
dtype=dtype)
model_utils.save_hparams(_hparams, FLAGS.output_dir)
logging.info('Using {} encoder with vocab size: {}'.format(
_hparams[HP_TOKEN_TYPE.name], vocab_size))
loss_fn = get_loss_fn(
reduction_factor=_hparams[HP_TIME_REDUCT_FACTOR.name])
start_token = encoder_fn('')[0]
decode_fn = decoding.greedy_decode_fn(model, start_token=start_token)
accuracy_fn = metrics.build_accuracy_fn(decode_fn)
cer_fn = metrics.build_cer_fn(decode_fn, idx_to_text)
wer_fn = metrics.build_wer_fn(decode_fn, idx_to_text)
optimizer = tf.keras.optimizers.SGD(_hparams[HP_LEARNING_RATE.name],
momentum=0.9)
if FLAGS.fp16_run:
optimizer = mixed_precision.LossScaleOptimizer(optimizer,
loss_scale='dynamic')
encoder = model.layers[2]
prediction_network = model.layers[3]
encoder.summary()
prediction_network.summary()
model.summary()
dev_dataset, _ = get_dataset(FLAGS.data_dir,
'dev',
batch_size=FLAGS.batch_size,
n_epochs=FLAGS.n_epochs,
strategy=strategy,
max_size=FLAGS.eval_size)
# dev_steps = dev_specs['size'] // FLAGS.batch_size
log_dir = os.path.join(FLAGS.tb_log_dir,
datetime.now().strftime('%Y%m%d-%H%M%S'))
with tf.summary.create_file_writer(log_dir).as_default():
hp.hparams(hparams)
if FLAGS.mode == 'train':
train_dataset, _ = get_dataset(FLAGS.data_dir,
'train',
batch_size=FLAGS.batch_size,
n_epochs=FLAGS.n_epochs,
strategy=strategy)
# train_steps = train_specs['size'] // FLAGS.batch_size
os.makedirs(FLAGS.output_dir, exist_ok=True)
checkpoint_template = os.path.join(
FLAGS.output_dir, 'checkpoint_{step}_{val_loss:.4f}.hdf5')
run_training(model=model,
optimizer=optimizer,
loss_fn=loss_fn,
train_dataset=train_dataset,
batch_size=FLAGS.batch_size,
n_epochs=FLAGS.n_epochs,
checkpoint_template=checkpoint_template,
strategy=strategy,
steps_per_log=FLAGS.steps_per_log,
steps_per_checkpoint=FLAGS.steps_per_checkpoint,
eval_dataset=dev_dataset,
train_metrics=[],
eval_metrics=[accuracy_fn, cer_fn, wer_fn],
gpus=gpus)
elif FLAGS.mode == 'eval' or FLAGS.mode == 'test':
if FLAGS.checkpoint is None:
raise Exception(
'You must provide a checkpoint to perform eval.')
if FLAGS.mode == 'test':
dataset, test_specs = get_dataset(FLAGS.data_dir,
'test',
batch_size=FLAGS.batch_size,
n_epochs=FLAGS.n_epochs)
else:
dataset = dev_dataset
eval_start_time = time.time()
eval_loss, eval_metrics_results = run_evaluate(
model=model,
optimizer=optimizer,
loss_fn=loss_fn,
eval_dataset=dataset,
batch_size=FLAGS.batch_size,
strategy=strategy,
metrics=[accuracy_fn, cer_fn, wer_fn],
gpus=gpus)
validation_log_str = 'VALIDATION RESULTS: Time: {:.4f}, Loss: {:.4f}'.format(
time.time() - eval_start_time, eval_loss)
for metric_name, metric_result in eval_metrics_results.items():
validation_log_str += ', {}: {:.4f}'.format(
metric_name, metric_result)
print(validation_log_str)
def main(_):
strategy, dtype = configure_environment(
gpu_names=FLAGS.gpus,
fp16_run=FLAGS.fp16_run)
hparams, tb_hparams = setup_hparams(
log_dir=FLAGS.tb_log_dir,
checkpoint=FLAGS.checkpoint)
os.makedirs(FLAGS.output_dir, exist_ok=True)
if FLAGS.checkpoint is None:
encoder_dir = FLAGS.data_dir
else:
encoder_dir = os.path.dirname(os.path.realpath(FLAGS.checkpoint))
shutil.copy(
os.path.join(encoder_dir, 'encoder.subwords'),
os.path.join(FLAGS.output_dir, 'encoder.subwords'))
encoder_fn, idx_to_text, vocab_size = encoding.get_encoder(
encoder_dir=FLAGS.output_dir,
hparams=hparams)
if HP_VOCAB_SIZE.name not in hparams:
hparams[HP_VOCAB_SIZE.name] = vocab_size
with strategy.scope():
model = build_keras_model(hparams,
dtype=dtype)
if FLAGS.checkpoint is not None:
model.load_weights(FLAGS.checkpoint)
logging.info('Restored weights from {}.'.format(FLAGS.checkpoint))
model_utils.save_hparams(hparams, FLAGS.output_dir)
optimizer = tf.keras.optimizers.SGD(hparams[HP_LEARNING_RATE.name],
momentum=0.9)
if FLAGS.fp16_run:
optimizer = mixed_precision.LossScaleOptimizer(optimizer,
loss_scale='dynamic')
logging.info('Using {} encoder with vocab size: {}'.format(
hparams[HP_TOKEN_TYPE.name], vocab_size))
loss_fn = get_loss_fn(
reduction_factor=hparams[HP_TIME_REDUCT_FACTOR.name])
decode_fn = decoding.greedy_decode_fn(model, hparams)
accuracy_fn = metrics.build_accuracy_fn(decode_fn)
wer_fn = metrics.build_wer_fn(decode_fn, idx_to_text)
encoder = model.layers[2]
prediction_network = model.layers[3]
encoder.summary()
prediction_network.summary()
model.summary()
dev_dataset = None
if FLAGS.eval_size != 0:
dev_dataset = get_dataset(FLAGS.data_dir, 'dev',
batch_size=FLAGS.batch_size, n_epochs=FLAGS.n_epochs,
strategy=strategy, max_size=FLAGS.eval_size)
log_dir = os.path.join(FLAGS.tb_log_dir,
datetime.now().strftime('%Y%m%d-%H%M%S'))
with tf.summary.create_file_writer(log_dir).as_default():
hp.hparams(tb_hparams)
if FLAGS.mode == 'train':
train_dataset = get_dataset(FLAGS.data_dir, 'train',
batch_size=FLAGS.batch_size, n_epochs=FLAGS.n_epochs,
strategy=strategy)
os.makedirs(FLAGS.output_dir, exist_ok=True)
checkpoint_template = os.path.join(FLAGS.output_dir,
'checkpoint_{step}_{val_loss:.4f}.hdf5')
run_training(
model=model,
optimizer=optimizer,
loss_fn=loss_fn,
train_dataset=train_dataset,
batch_size=FLAGS.batch_size,
n_epochs=FLAGS.n_epochs,
checkpoint_template=checkpoint_template,
hparams=hparams,
strategy=strategy,
steps_per_log=FLAGS.steps_per_log,
steps_per_checkpoint=FLAGS.steps_per_checkpoint,
eval_dataset=dev_dataset,
train_metrics=[],
eval_metrics=[accuracy_fn, wer_fn])
elif FLAGS.mode == 'eval' or FLAGS.mode == 'test':
if FLAGS.checkpoint is None:
raise Exception('You must provide a checkpoint to perform eval.')
if FLAGS.mode == 'test':
dataset = get_dataset(FLAGS.data_dir, 'test',
batch_size=FLAGS.batch_size, n_epochs=FLAGS.n_epochs)
else:
dataset = dev_dataset
eval_start_time = time.time()
eval_loss, eval_metrics_results = run_evaluate(
model=model,
optimizer=optimizer,
loss_fn=loss_fn,
eval_dataset=dataset,
batch_size=FLAGS.batch_size,
hparams=hparams,
strategy=strategy,
metrics=[accuracy_fn, wer_fn],
gpus=gpus)
validation_log_str = 'VALIDATION RESULTS: Time: {:.4f}, Loss: {:.4f}'.format(
time.time() - eval_start_time, eval_loss)
for metric_name, metric_result in eval_metrics_results.items():
validation_log_str += ', {}: {:.4f}'.format(metric_name, metric_result)
print(validation_log_str)
def _run_experiment(num, hparams):
run_dir = os.path.join(FLAGS.tb_log_dir, 'hparam_tuning', str(num))
with tf.summary.create_file_writer(run_dir).as_default():
hp.hparams(hparams)
hparams = {h.name: hparams[h] for h in hparams}
logging.info(
'Running experiment {} with hyperparameters:\n{}'.format(
num, json.dumps(hparams, indent=4)))
tokenizer_fn = preprocessing.get_tokenizer_fn(hparams)
vocab, unk_id = vocabulary.build_vocab(all_texts,
tokenizer_fn=tokenizer_fn,
hparams=hparams)
vocab_table = preprocessing.build_lookup_table(
vocab, default_value=unk_id)
candidates_table = preprocessing.build_lookup_table(candidates)
vocab_size = len(vocab)
num_candidates = len(candidates)
logging.info('Vocabulary size: {}'.format(vocab_size))
logging.info('# of candidates: {}'.format(num_candidates))
candidates_tok = tokenizer_fn(candidates).to_tensor()
candidates_enc = vocab_table.lookup(candidates_tok)
dataset_fn = get_dataset_fn(tokenizer_fn=tokenizer_fn,
vocab_table=vocab_table,
candidates_table=candidates_table,
hparams=hparams)
train_dataset, train_size = dataset_fn(suffix='trn',
base_path=FLAGS.data_dir,
task=FLAGS.task)
dev_dataset, dev_size = dataset_fn(suffix='dev',
base_path=FLAGS.data_dir,
task=FLAGS.task)
keras_model = build_keras_model(vocab_size=vocab_size,
candidates_enc=candidates_enc,
hparams=hparams)
optimizer = tf.keras.optimizers.Adam(
learning_rate=hparams[HP_LEARNING_RATE.name])
keras_model.compile(optimizer=optimizer,
loss='sparse_categorical_crossentropy',
metrics=['accuracy'])
steps_per_epoch = train_size // hparams[HP_BATCH_SIZE.name]
validation_steps = dev_size // hparams[HP_BATCH_SIZE.name]
model_dir = os.path.join(FLAGS.model_dir, str(num))
os.makedirs(model_dir, exist_ok=True)
py_vocab = [tok.decode('utf8') for tok in vocab.numpy()]
vocabulary.save_vocab(py_vocab, model_dir)
hparams_fp = os.path.join(model_dir, 'hparams.json')
with open(hparams_fp, 'w') as hp_json:
json.dump(hparams, hp_json)
keras_model.fit(train_dataset,
epochs=hparams[HP_EPOCHS.name],
steps_per_epoch=steps_per_epoch,
callbacks=[
tf.keras.callbacks.TensorBoard(run_dir),
hp.KerasCallback(run_dir, hparams)
])
export_fp = os.path.join(model_dir, 'saved_model')
keras_model.save(export_fp)
loss, accuracy = keras_model.evaluate(dev_dataset,
steps=validation_steps)
tf.summary.scalar(METRIC_LOSS, loss, step=1)
tf.summary.scalar(METRIC_ACCURACY, accuracy, step=1)
return loss, accuracy
def main(args):
model_dir = os.path.dirname(os.path.realpath(args.checkpoint))
hparams = model_utils.load_hparams(model_dir)
_, tok_to_text, vocab_size = encoding.load_encoder(model_dir,
hparams=hparams)
hparams[HP_VOCAB_SIZE.name] = vocab_size
model = build_keras_model(hparams, stateful=True)
model.load_weights(args.checkpoint)
decoder_fn = decoding.greedy_decode_fn(model)
p = pyaudio.PyAudio()
def listen_callback(in_data, frame_count, time_info, status):
global LAST_OUTPUT
audio = tf.io.decode_raw(in_data, out_type=tf.float32)
mel_specs = preprocessing.compute_mel_spectrograms(
audio_arr=audio,
sample_rate=SAMPLE_RATE,
n_mel_bins=hparams[HP_MEL_BINS.name],
frame_length=hparams[HP_FRAME_LENGTH.name],
frame_step=hparams[HP_FRAME_STEP.name],
hertz_low=hparams[HP_HERTZ_LOW.name],
hertz_high=hparams[HP_HERTZ_HIGH.name])
mel_specs = tf.expand_dims(mel_specs, axis=0)
decoded = decoder_fn(mel_specs, max_length=5)[0]
transcription = LAST_OUTPUT + tok_to_text(decoded)\
.numpy().decode('utf8')
if transcription != LAST_OUTPUT:
LAST_OUTPUT = transcription
print(transcription)
return in_data, pyaudio.paContinue
stream = p.open(format=pyaudio.paFloat32,
channels=NUM_CHANNELS,
rate=SAMPLE_RATE,
input=True,
frames_per_buffer=CHUNK_SIZE,
stream_callback=listen_callback)
print('Listening...')
stream.start_stream()
while stream.is_active():
time.sleep(0.1)
stream.stop_stream()
stream.close()
p.terminate()