def get_model(args,
model_config,
steps_per_epoch,
warmup_steps,
num_labels,
max_seq_length,
is_hub_module=False):
# Get classifier and core model (used to initialize from checkpoint)
if args.init_checkpoint is None and PRETRAINED_MODELS[
args.model_class]['is_tfhub_model']:
# load pretrained model from TF-hub
hub_module_url = f"https://tfhub.dev/{PRETRAINED_MODELS[args.model_class]['hub_url']}"
hub_module_trainable = True
else:
hub_module_url = None
hub_module_trainable = False
classifier_model, core_model = bert_models.classifier_model(
model_config,
num_labels,
max_seq_length,
hub_module_url=hub_module_url,
hub_module_trainable=hub_module_trainable)
# Optimizer
optimizer = utils.optimizer.create_optimizer(
args.learning_rate, steps_per_epoch * args.num_epochs, warmup_steps,
args.end_lr, args.optimizer_type)
classifier_model.optimizer = configure_optimizer(optimizer,
use_float16=False,
use_graph_rewrite=False)
return classifier_model, core_model
def export_classifier(model_export_path, input_meta_data, bert_config,
model_dir):
"""Exports a trained model as a `SavedModel` for inference.
Args:
model_export_path: a string specifying the path to the SavedModel directory.
input_meta_data: dictionary containing meta data about input and model.
bert_config: Bert configuration file to define core bert layers.
model_dir: The directory where the model weights and training/evaluation
summaries are stored.
Raises:
Export path is not specified, got an empty string or None.
"""
if not model_export_path:
raise ValueError('Export path is not specified: %s' %
model_export_path)
if not model_dir:
raise ValueError('Export path is not specified: %s' % model_dir)
# Export uses float32 for now, even if training uses mixed precision.
tf.keras.mixed_precision.experimental.set_policy('float32')
classifier_model = bert_models.classifier_model(
bert_config,
input_meta_data.get('num_labels', 1),
hub_module_url=FLAGS.hub_module_url,
hub_module_trainable=False)[0]
model_saving_utils.export_bert_model(model_export_path,
model=classifier_model,
checkpoint_dir=model_dir)
def predict(strategy, albert_config, input_meta_data, predict_input_fn):
"""Function outputs both the ground truth predictions as .tsv files."""
with strategy.scope():
classifier_model = bert_models.classifier_model(
albert_config, input_meta_data['num_labels'])[0]
checkpoint = tf.train.Checkpoint(model=classifier_model)
latest_checkpoint_file = (FLAGS.predict_checkpoint_path or
tf.train.latest_checkpoint(FLAGS.model_dir))
assert latest_checkpoint_file
logging.info(
'Checkpoint file %s found and restoring from '
'checkpoint', latest_checkpoint_file)
checkpoint.restore(
latest_checkpoint_file).assert_existing_objects_matched()
preds, ground_truth = run_classifier_bert.get_predictions_and_labels(
strategy, classifier_model, predict_input_fn, return_probs=True)
output_predict_file = os.path.join(FLAGS.model_dir, 'test_results.tsv')
with tf.io.gfile.GFile(output_predict_file, 'w') as writer:
logging.info('***** Predict results *****')
for probabilities in preds:
output_line = '\t'.join(
str(class_probability)
for class_probability in probabilities) + '\n'
writer.write(output_line)
ground_truth_labels_file = os.path.join(FLAGS.model_dir,
'output_labels.tsv')
with tf.io.gfile.GFile(ground_truth_labels_file, 'w') as writer:
logging.info('***** Ground truth results *****')
for label in ground_truth:
output_line = '\t'.join(str(label)) + '\n'
writer.write(output_line)
return
def _get_classifier_model():
"""Gets a classifier model."""
classifier_model, core_model = (
bert_models.classifier_model(
bert_config, num_classes, self.seq_len, hub_module_url=self.uri))
classifier_model.optimizer = optimization.create_optimizer(
initial_lr, steps_per_epoch * epochs, warmup_steps)
return classifier_model, core_model
def get_model(args, model_config, num_labels, max_seq_length, is_hub_module=False):
classifier_model, _ = bert_models.classifier_model(
model_config,
num_labels,
max_seq_length,
hub_module_url=None,
hub_module_trainable=False)
return classifier_model
def load_tf_model(tf_config_path, num_labels=3, max_seq_length=96):
config = bert_configs.BertConfig.from_json_file(tf_config_path)
classifier_model, _ = bert_models.classifier_model(
config,
num_labels,
max_seq_length,
hub_module_url=None,
hub_module_trainable=False)
return classifier_model
def get_model(args, model_config, num_labels, max_seq_length):
if args.use_tf_hub and PRETRAINED_MODELS[
args.model_class]['is_tfhub_model']:
hub_module_url = f"https://tfhub.dev/{PRETRAINED_MODELS[args.model_class]['hub_url']}"
hub_module_trainable = True
else:
hub_module_url = None
hub_module_trainable = False
classifier_model, _ = bert_models.classifier_model(
model_config,
num_labels,
max_seq_length,
hub_module_url=hub_module_url,
hub_module_trainable=hub_module_trainable)
return classifier_model
def _get_classifier_model():
"""Gets a classifier model."""
classifier_model, core_model = (bert_models.classifier_model(
bert_config,
num_classes,
max_seq_length,
hub_module_url=FLAGS.hub_module_url,
hub_module_trainable=FLAGS.hub_module_trainable))
optimizer = optimization.create_optimizer(initial_lr,
steps_per_epoch * epochs,
warmup_steps, FLAGS.end_lr,
FLAGS.optimizer_type)
classifier_model.optimizer = performance.configure_optimizer(
optimizer, use_float16=common_flags.use_float16())
return classifier_model, core_model
def _get_classifier_model():
"""Gets a classifier model."""
bert_config = bert_configs.BertConfig.from_json_file(
FLAGS.bert_config_file)
num_classes = input_meta_data['num_labels']
classifier_model, core_model = (bert_models.classifier_model(
bert_config,
num_classes,
input_meta_data['max_seq_length'],
hub_module_url=FLAGS.hub_module_url,
hub_module_trainable=False))
classifier_model.optimizer = optimization.create_optimizer(
initial_lr, steps_per_epoch * epochs, warmup_steps)
if FLAGS.fp16_implementation == 'graph_rewrite':
classifier_model.optimizer = tf.train.experimental.enable_mixed_precision_graph_rewrite(
classifier_model.optimizer)
return classifier_model, core_model
def test_classifier_model(self):
model, core_model = bert_models.classifier_model(
self._bert_test_config,
num_labels=3,
max_seq_length=5,
final_layer_initializer=None,
hub_module_url=None,
hub_module_trainable=None)
self.assertIsInstance(model, tf.keras.Model)
self.assertIsInstance(core_model, tf.keras.Model)
# model has one classification output with num_labels=3.
self.assertEqual(model.output.shape.as_list(), [None, 3])
# Expect two output from core_model: sequence and classification output.
self.assertIsInstance(core_model.output, list)
self.assertLen(core_model.output, 2)
def _get_model():
"""Gets a siamese model."""
if FLAGS.model_type == 'siamese':
model, core_model = (siamese_bert.siamese_model(
bert_config, num_classes, siamese_type=FLAGS.siamese_type))
else:
model, core_model = (bert_models.classifier_model(
bert_config, num_classes, max_seq_length))
optimizer = optimization.create_optimizer(initial_lr,
steps_per_epoch * epochs,
warmup_steps, FLAGS.end_lr,
FLAGS.optimizer_type)
model.optimizer = performance.configure_optimizer(
optimizer,
use_float16=common_flags.use_float16(),
use_graph_rewrite=common_flags.use_graph_rewrite())
return model, core_model
def _get_classifier_model():
"""Gets a classifier model."""
classifier_model, core_model = (bert_models.classifier_model(
bert_config,
num_classes,
max_seq_length,
hub_module_url=FLAGS.hub_module_url))
classifier_model.optimizer = optimization.create_optimizer(
initial_lr, steps_per_epoch * epochs, warmup_steps)
if FLAGS.fp16_implementation == 'graph_rewrite':
# Note: when flags_obj.fp16_implementation == "graph_rewrite", dtype as
# determined by flags_core.get_tf_dtype(flags_obj) would be 'float32'
# which will ensure tf.compat.v2.keras.mixed_precision and
# tf.train.experimental.enable_mixed_precision_graph_rewrite do not double
# up.
classifier_model.optimizer = tf.train.experimental.enable_mixed_precision_graph_rewrite(
classifier_model.optimizer)
return classifier_model, core_model
def _get_classifier_model():
"""Gets a classifier model."""
bert_config = bert_configs.BertConfig.from_json_file(FLAGS.bert_config_file)
classifier_model, core_model = (
bert_models.classifier_model(
bert_config,
num_classes,
input_meta_data['max_seq_length'],
hub_module_url=FLAGS.hub_module_url,
hub_module_trainable=False))
epochs = FLAGS.num_train_epochs
steps_per_epoch = int(70000 / 32)
warmup_steps = int(2 * 70000 * 0.1 / 32)
classifier_model.optimizer = optimization.create_optimizer(
2e-5, steps_per_epoch * 2, warmup_steps)
return classifier_model, core_model
def export_classifier(model_export_path, input_meta_data,
restore_model_using_load_weights, bert_config,
model_dir):
"""Exports a trained model as a `SavedModel` for inference.
Args:
model_export_path: a string specifying the path to the SavedModel directory.
input_meta_data: dictionary containing meta data about input and model.
restore_model_using_load_weights: Whether to use checkpoint.restore() API
for custom checkpoint or to use model.load_weights() API. There are 2
different ways to save checkpoints. One is using tf.train.Checkpoint and
another is using Keras model.save_weights(). Custom training loop
implementation uses tf.train.Checkpoint API and Keras ModelCheckpoint
callback internally uses model.save_weights() API. Since these two API's
cannot be used together, model loading logic must be take into account how
model checkpoint was saved.
bert_config: Bert configuration file to define core bert layers.
model_dir: The directory where the model weights and training/evaluation
summaries are stored.
Raises:
Export path is not specified, got an empty string or None.
"""
if not model_export_path:
raise ValueError('Export path is not specified: %s' %
model_export_path)
if not model_dir:
raise ValueError('Export path is not specified: %s' % model_dir)
# Export uses float32 for now, even if training uses mixed precision.
tf.keras.mixed_precision.experimental.set_policy('float32')
classifier_model = bert_models.classifier_model(
bert_config, input_meta_data['num_labels'],
input_meta_data['max_seq_length'])[0]
model_saving_utils.export_bert_model(
model_export_path,
model=classifier_model,
checkpoint_dir=model_dir,
restore_model_using_load_weights=restore_model_using_load_weights)
def custom_main(custom_callbacks=None, custom_metrics=None):
"""Run classification or regression.
Args:
custom_callbacks: list of tf.keras.Callbacks passed to training loop.
custom_metrics: list of metrics passed to the training loop.
"""
gin.parse_config_files_and_bindings(FLAGS.gin_file, FLAGS.gin_param)
with tf.io.gfile.GFile(FLAGS.input_meta_data_path, 'rb') as reader:
input_meta_data = json.loads(reader.read().decode('utf-8'))
label_type = LABEL_TYPES_MAP[input_meta_data.get('label_type', 'int')]
include_sample_weights = input_meta_data.get('has_sample_weights', False)
if not FLAGS.model_dir:
FLAGS.model_dir = '/tmp/bert20/'
bert_config = bert_configs.BertConfig.from_json_file(
FLAGS.bert_config_file)
if FLAGS.mode == 'export_only':
export_classifier(FLAGS.model_export_path, input_meta_data,
bert_config, FLAGS.model_dir)
return
strategy = distribution_utils.get_distribution_strategy(
distribution_strategy=FLAGS.distribution_strategy,
num_gpus=FLAGS.num_gpus,
tpu_address=FLAGS.tpu)
eval_input_fn = get_dataset_fn(
FLAGS.eval_data_path,
input_meta_data['max_seq_length'],
FLAGS.eval_batch_size,
is_training=False,
label_type=label_type,
include_sample_weights=include_sample_weights)
if FLAGS.mode == 'predict':
with strategy.scope():
classifier_model = bert_models.classifier_model(
bert_config, input_meta_data['num_labels'])[0]
checkpoint = tf.train.Checkpoint(model=classifier_model)
latest_checkpoint_file = (FLAGS.predict_checkpoint_path
or tf.train.latest_checkpoint(
FLAGS.model_dir))
assert latest_checkpoint_file
logging.info(
'Checkpoint file %s found and restoring from '
'checkpoint', latest_checkpoint_file)
checkpoint.restore(
latest_checkpoint_file).assert_existing_objects_matched()
preds, _ = get_predictions_and_labels(strategy,
classifier_model,
eval_input_fn,
return_probs=True)
output_predict_file = os.path.join(FLAGS.model_dir, 'test_results.tsv')
with tf.io.gfile.GFile(output_predict_file, 'w') as writer:
logging.info('***** Predict results *****')
for probabilities in preds:
output_line = '\t'.join(
str(class_probability)
for class_probability in probabilities) + '\n'
writer.write(output_line)
return
if FLAGS.mode != 'train_and_eval':
raise ValueError('Unsupported mode is specified: %s' % FLAGS.mode)
train_input_fn = get_dataset_fn(
FLAGS.train_data_path,
input_meta_data['max_seq_length'],
FLAGS.train_batch_size,
is_training=True,
label_type=label_type,
include_sample_weights=include_sample_weights)
run_bert(strategy,
input_meta_data,
bert_config,
train_input_fn,
eval_input_fn,
custom_callbacks=custom_callbacks,
custom_metrics=custom_metrics)
max_seq_length = input_meta_data['max_seq_length']
num_classes = input_meta_data['num_labels']
batch_size = 32
eval_batch_size = 32
train_input_fn = run_classifier.get_dataset_fn(train_data_path, max_seq_length, batch_size, is_training=True)
eval_input_fn = run_classifier.get_dataset_fn(eval_data_path, max_seq_length, eval_batch_size, is_training=False)
strategy = distribution_utils.get_distribution_strategy(
distribution_strategy='one_device', num_gpus=2)
with strategy.scope():
training_dataset = train_input_fn()
evaluation_dataset = eval_input_fn()
bert_config = bert_configs.BertConfig.from_json_file(bert_config_file)
classifier_model, encoder = bert_models.classifier_model(
bert_config, num_classes, max_seq_length)
checkpoint = tf.train.Checkpoint(model=encoder)
#checkpoint.restore(ckpt_path).assert_consumed()
epochs = 3
train_data_size = input_meta_data['train_data_size']
eval_data_size = input_meta_data['eval_data_size']
steps_per_epoch = int(train_data_size / batch_size)
warmup_steps = int(epochs * train_data_size * 0.1 / batch_size)
optimizer = optimization.create_optimizer(
2e-5, num_train_steps=steps_per_epoch * epochs, num_warmup_steps=warmup_steps)
def metric_fn():
return tf.keras.metrics.SparseCategoricalAccuracy(
'test_accuracy', dtype=tf.float32)
def custom_main(custom_callbacks=None, custom_metrics=None):
"""Run classification or regression.
Args:
custom_callbacks: list of tf.keras.Callbacks passed to training loop.
custom_metrics: list of metrics passed to the training loop.
"""
gin.parse_config_files_and_bindings(FLAGS.gin_file, FLAGS.gin_param)
with tf.io.gfile.GFile(FLAGS.input_meta_data_path, 'rb') as reader:
input_meta_data = json.loads(reader.read().decode('utf-8'))
label_type = LABEL_TYPES_MAP[input_meta_data.get('label_type', 'int')]
include_sample_weights = input_meta_data.get('has_sample_weights', False)
if not FLAGS.model_dir:
FLAGS.model_dir = '/tmp/type-bert-finetune/'
bert_config = bert_configs.BertConfig.from_json_file(
FLAGS.bert_config_file)
if FLAGS.mode == 'export_only':
export_classifier(FLAGS.model_export_path, input_meta_data,
bert_config, FLAGS.model_dir)
return
strategy = distribution_utils.get_distribution_strategy(
distribution_strategy=FLAGS.distribution_strategy,
num_gpus=FLAGS.num_gpus,
tpu_address=FLAGS.tpu)
eval_input_fn = get_dataset_fn(
FLAGS.eval_data_path,
input_meta_data['max_seq_length'],
FLAGS.eval_batch_size,
is_training=False,
label_type=label_type,
include_sample_weights=include_sample_weights)
if FLAGS.mode == 'predict':
num_labels = input_meta_data.get('num_labels', 1)
with strategy.scope():
classifier_model = bert_models.classifier_model(
bert_config, num_labels)[0]
checkpoint = tf.train.Checkpoint(model=classifier_model)
latest_checkpoint_file = (FLAGS.predict_checkpoint_path
or tf.train.latest_checkpoint(
FLAGS.model_dir))
assert latest_checkpoint_file
logging.info(
'Checkpoint file %s found and restoring from '
'checkpoint', latest_checkpoint_file)
checkpoint.restore(
latest_checkpoint_file).assert_existing_objects_matched()
preds, labels, indices, probs, user_def_bool, filelist, input_seqs, seq_indices, times = get_predictions_and_labels(
strategy,
classifier_model,
eval_input_fn,
is_regression=(num_labels == 1),
return_probs=True)
ckpt = FLAGS.predict_checkpoint_path.split('-')[-1]
output_predict_file = os.path.join(
FLAGS.model_dir, 'test_results_{0}.tsv'.format(ckpt))
output_probs_file = os.path.join(
FLAGS.model_dir, 'test_probs_results_{0}.nps'.format(ckpt))
output_indices_file = os.path.join(
FLAGS.model_dir, 'test_indices_results_{0}.nps'.format(ckpt))
with tf.io.gfile.GFile(output_predict_file, 'w') as writer:
logging.info('***** Predict results *****')
for pred, label, is_user_def in zip(preds, labels,
user_def_bool):
output_line = '\t'.join(
[str(label), str(pred),
str(is_user_def)]) + '\n'
writer.write(output_line)
indices = np.concatenate(indices, axis=0)
probs = np.concatenate(probs, axis=0)
np.save(output_probs_file, probs)
np.save(output_indices_file, indices)
return
if FLAGS.mode != 'train_and_eval':
raise ValueError('Unsupported mode is specified: %s' % FLAGS.mode)
train_input_fn = get_dataset_fn(
FLAGS.train_data_path,
input_meta_data['max_seq_length'],
FLAGS.train_batch_size,
is_training=True,
label_type=label_type,
include_sample_weights=include_sample_weights)
if FLAGS.checkpoint_path:
with strategy.scope():
num_labels = input_meta_data.get('num_labels', 1)
classifier_model = bert_models.classifier_model(
bert_config, num_labels)[0]
checkpoint = tf.train.Checkpoint(model=classifier_model)
latest_checkpoint_file = (FLAGS.checkpoint_path
or tf.train.latest_checkpoint(
FLAGS.model_dir))
assert latest_checkpoint_file
logging.info(
'Checkpoint file %s found and restoring from '
'checkpoint', latest_checkpoint_file)
checkpoint.restore(
latest_checkpoint_file).assert_existing_objects_matched()
run_bert(strategy,
input_meta_data,
bert_config,
train_input_fn,
eval_input_fn,
custom_callbacks=custom_callbacks,
custom_metrics=custom_metrics)
