def main(argv):
del argv # unused arg
tf.io.gfile.makedirs(FLAGS.output_dir)
logging.info('Saving checkpoints at %s', FLAGS.output_dir)
# Set seeds
tf.random.set_seed(FLAGS.seed)
np.random.seed(FLAGS.seed)
torch.manual_seed(FLAGS.seed)
# Resolve CUDA device(s)
if FLAGS.use_gpu and torch.cuda.is_available():
print('Running model with CUDA.')
device = 'cuda:0'
else:
print('Running model on CPU.')
device = 'cpu'
train_batch_size = FLAGS.train_batch_size
eval_batch_size = FLAGS.eval_batch_size // FLAGS.num_dropout_samples_eval
# As per the Kaggle challenge, we have split sizes:
# train: 35,126
# validation: 10,906
# test: 42,670
ds_info = tfds.builder('diabetic_retinopathy_detection').info
steps_per_epoch = ds_info.splits['train'].num_examples // train_batch_size
steps_per_validation_eval = (ds_info.splits['validation'].num_examples //
eval_batch_size)
steps_per_test_eval = ds_info.splits['test'].num_examples // eval_batch_size
data_dir = FLAGS.data_dir
dataset_train_builder = ub.datasets.get('diabetic_retinopathy_detection',
split='train',
data_dir=data_dir)
dataset_train = dataset_train_builder.load(batch_size=train_batch_size)
dataset_validation_builder = ub.datasets.get(
'diabetic_retinopathy_detection',
split='validation',
data_dir=data_dir,
is_training=not FLAGS.use_validation)
validation_batch_size = (eval_batch_size
if FLAGS.use_validation else train_batch_size)
dataset_validation = dataset_validation_builder.load(
batch_size=validation_batch_size)
if not FLAGS.use_validation:
# Note that this will not create any mixed batches of train and validation
# images.
dataset_train = dataset_train.concatenate(dataset_validation)
dataset_test_builder = ub.datasets.get('diabetic_retinopathy_detection',
split='test',
data_dir=data_dir)
dataset_test = dataset_test_builder.load(batch_size=eval_batch_size)
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.output_dir, 'summaries'))
# MC Dropout ResNet50 based on PyTorch Vision implementation
logging.info('Building Torch ResNet-50 MC Dropout model.')
model = ub.models.resnet50_dropout_torch(num_classes=1,
dropout_rate=FLAGS.dropout_rate)
logging.info('Model number of weights: %s',
torch_utils.count_parameters(model))
# Linearly scale learning rate and the decay epochs by vanilla settings.
base_lr = FLAGS.base_learning_rate
optimizer = torch.optim.SGD(model.parameters(),
lr=base_lr,
momentum=1.0 - FLAGS.one_minus_momentum,
nesterov=True)
steps_to_lr_peak = int(steps_per_epoch * FLAGS.lr_warmup_epochs)
scheduler = torch.optim.lr_scheduler.CosineAnnealingWarmRestarts(
optimizer, steps_to_lr_peak, T_mult=2)
model = model.to(device)
metrics = utils.get_diabetic_retinopathy_base_metrics(
use_tpu=False,
num_bins=FLAGS.num_bins,
use_validation=FLAGS.use_validation)
# Define additional metrics that would fail in a TF TPU implementation.
metrics.update(
utils.get_diabetic_retinopathy_cpu_metrics(
use_validation=FLAGS.use_validation))
# Initialize loss function based on class reweighting setting
loss_fn = torch.nn.BCELoss()
sigmoid = torch.nn.Sigmoid()
max_steps = steps_per_epoch * FLAGS.train_epochs
image_h = 512
image_w = 512
def run_train_epoch(iterator):
def train_step(inputs):
images = inputs['features']
labels = inputs['labels']
images = torch.from_numpy(images._numpy()).view(
train_batch_size,
3, # pylint: disable=protected-access
image_h,
image_w).to(device)
labels = torch.from_numpy(labels._numpy()).to(device).float() # pylint: disable=protected-access
# Zero the parameter gradients
optimizer.zero_grad()
# Forward
logits = model(images)
probs = sigmoid(logits).squeeze(-1)
# Add L2 regularization loss to NLL
negative_log_likelihood = loss_fn(probs, labels)
l2_loss = sum(p.pow(2.0).sum() for p in model.parameters())
loss = negative_log_likelihood + (FLAGS.l2 * l2_loss)
# Backward/optimizer
loss.backward()
optimizer.step()
# Convert to NumPy for metrics updates
loss = loss.detach()
negative_log_likelihood = negative_log_likelihood.detach()
labels = labels.detach()
probs = probs.detach()
if device != 'cpu':
loss = loss.cpu()
negative_log_likelihood = negative_log_likelihood.cpu()
labels = labels.cpu()
probs = probs.cpu()
loss = loss.numpy()
negative_log_likelihood = negative_log_likelihood.numpy()
labels = labels.numpy()
probs = probs.numpy()
metrics['train/loss'].update_state(loss)
metrics['train/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['train/accuracy'].update_state(labels, probs)
metrics['train/auprc'].update_state(labels, probs)
metrics['train/auroc'].update_state(labels, probs)
metrics['train/ece'].add_batch(probs, label=labels)
for step in range(steps_per_epoch):
train_step(next(iterator))
if step % 100 == 0:
current_step = (epoch + 1) * step
time_elapsed = time.time() - start_time
steps_per_sec = float(current_step) / time_elapsed
eta_seconds = (max_steps - current_step
) / steps_per_sec if steps_per_sec else 0
message = (
'{:.1%} completion: epoch {:d}/{:d}. {:.1f} steps/s. '
'ETA: {:.0f} min. Time elapsed: {:.0f} min'.format(
current_step / max_steps, epoch + 1,
FLAGS.train_epochs, steps_per_sec, eta_seconds / 60,
time_elapsed / 60))
logging.info(message)
def run_eval_epoch(iterator, dataset_split, num_steps):
def eval_step(inputs, model):
images = inputs['features']
labels = inputs['labels']
images = torch.from_numpy(images._numpy()).view(
eval_batch_size,
3, # pylint: disable=protected-access
image_h,
image_w).to(device)
labels = torch.from_numpy(
labels._numpy()).to(device).float().unsqueeze(-1) # pylint: disable=protected-access
with torch.no_grad():
logits = torch.stack([
model(images)
for _ in range(FLAGS.num_dropout_samples_eval)
],
dim=-1)
# Logits dimension is (batch_size, 1, num_dropout_samples).
logits = logits.squeeze()
# It is now (batch_size, num_dropout_samples).
probs = sigmoid(logits)
# labels_tiled shape is (batch_size, num_dropout_samples).
labels_tiled = torch.tile(labels,
(1, FLAGS.num_dropout_samples_eval))
log_likelihoods = -loss_fn(probs, labels_tiled)
negative_log_likelihood = torch.mean(
-torch.logsumexp(log_likelihoods, dim=-1) +
torch.log(torch.tensor(float(FLAGS.num_dropout_samples_eval))))
probs = torch.mean(probs, dim=-1)
# Convert to NumPy for metrics updates
negative_log_likelihood = negative_log_likelihood.detach()
labels = labels.detach()
probs = probs.detach()
if device != 'cpu':
negative_log_likelihood = negative_log_likelihood.cpu()
labels = labels.cpu()
probs = probs.cpu()
negative_log_likelihood = negative_log_likelihood.numpy()
labels = labels.numpy()
probs = probs.numpy()
metrics[dataset_split + '/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics[dataset_split + '/accuracy'].update_state(labels, probs)
metrics[dataset_split + '/auprc'].update_state(labels, probs)
metrics[dataset_split + '/auroc'].update_state(labels, probs)
metrics[dataset_split + '/ece'].add_batch(probs, label=labels)
for _ in range(num_steps):
eval_step(next(iterator), model=model)
metrics.update({'test/ms_per_example': tf.keras.metrics.Mean()})
start_time = time.time()
initial_epoch = 0
train_iterator = iter(dataset_train)
model.train()
for epoch in range(initial_epoch, FLAGS.train_epochs):
logging.info('Starting to run epoch: %s', epoch + 1)
run_train_epoch(train_iterator)
if FLAGS.use_validation:
validation_iterator = iter(dataset_validation)
logging.info('Starting to run validation eval at epoch: %s',
epoch + 1)
run_eval_epoch(validation_iterator, 'validation',
steps_per_validation_eval)
test_iterator = iter(dataset_test)
logging.info('Starting to run test eval at epoch: %s', epoch + 1)
test_start_time = time.time()
run_eval_epoch(test_iterator, 'test', steps_per_test_eval)
ms_per_example = (time.time() -
test_start_time) * 1e6 / eval_batch_size
metrics['test/ms_per_example'].update_state(ms_per_example)
# Step scheduler
scheduler.step()
# Log and write to summary the epoch metrics
utils.log_epoch_metrics(metrics=metrics, use_tpu=False)
total_results = {
name: metric.result()
for name, metric in metrics.items()
}
# Metrics from Robustness Metrics (like ECE) will return a dict with a
# single key/value, instead of a scalar.
total_results = {
k: (list(v.values())[0] if isinstance(v, dict) else v)
for k, v in total_results.items()
}
with summary_writer.as_default():
for name, result in total_results.items():
tf.summary.scalar(name, result, step=epoch + 1)
for metric in metrics.values():
metric.reset_states()
if (FLAGS.checkpoint_interval > 0
and (epoch + 1) % FLAGS.checkpoint_interval == 0):
checkpoint_path = os.path.join(FLAGS.output_dir,
f'model_{epoch + 1}.pt')
torch_utils.checkpoint_torch_model(model=model,
optimizer=optimizer,
epoch=epoch + 1,
checkpoint_path=checkpoint_path)
logging.info('Saved Torch checkpoint to %s', checkpoint_path)
final_checkpoint_path = os.path.join(FLAGS.output_dir,
f'model_{FLAGS.train_epochs}.pt')
torch_utils.checkpoint_torch_model(model=model,
optimizer=optimizer,
epoch=FLAGS.train_epochs,
checkpoint_path=final_checkpoint_path)
logging.info('Saved last checkpoint to %s', final_checkpoint_path)
with summary_writer.as_default():
hp.hparams({
'base_learning_rate': FLAGS.base_learning_rate,
'one_minus_momentum': FLAGS.one_minus_momentum,
'dropout_rate': FLAGS.dropout_rate,
'l2': FLAGS.l2,
'lr_warmup_epochs': FLAGS.lr_warmup_epochs
})
def main(argv):
del argv # unused arg
tf.io.gfile.makedirs(FLAGS.output_dir)
logging.info('Saving checkpoints at %s', FLAGS.output_dir)
tf.random.set_seed(FLAGS.seed)
if FLAGS.use_gpu:
logging.info('Use GPU')
strategy = tf.distribute.MirroredStrategy()
else:
logging.info('Use TPU at %s',
FLAGS.tpu if FLAGS.tpu is not None else 'local')
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=FLAGS.tpu)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.experimental.TPUStrategy(resolver)
train_input_fn = utils.load_input_fn(
split=tfds.Split.TRAIN,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size // FLAGS.batch_repetitions,
use_bfloat16=FLAGS.use_bfloat16)
clean_test_input_fn = utils.load_input_fn(
split=tfds.Split.TEST,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size,
use_bfloat16=FLAGS.use_bfloat16)
train_dataset = strategy.experimental_distribute_datasets_from_function(
train_input_fn)
test_datasets = {
'clean':
strategy.experimental_distribute_datasets_from_function(
clean_test_input_fn),
}
if FLAGS.corruptions_interval > 0:
if FLAGS.dataset == 'cifar10':
load_c_input_fn = utils.load_cifar10_c_input_fn
else:
load_c_input_fn = functools.partial(utils.load_cifar100_c_input_fn,
path=FLAGS.cifar100_c_path)
corruption_types, max_intensity = utils.load_corrupted_test_info(
FLAGS.dataset)
for corruption in corruption_types:
for intensity in range(1, max_intensity + 1):
input_fn = load_c_input_fn(
corruption_name=corruption,
corruption_intensity=intensity,
batch_size=FLAGS.per_core_batch_size,
use_bfloat16=FLAGS.use_bfloat16)
test_datasets['{0}_{1}'.format(corruption, intensity)] = (
strategy.experimental_distribute_datasets_from_function(
input_fn))
ds_info = tfds.builder(FLAGS.dataset).info
train_batch_size = FLAGS.per_core_batch_size * FLAGS.num_cores // FLAGS.batch_repetitions
test_batch_size = FLAGS.per_core_batch_size * FLAGS.num_cores
train_dataset_size = ds_info.splits['train'].num_examples
steps_per_epoch = train_dataset_size // train_batch_size
steps_per_eval = ds_info.splits['test'].num_examples // test_batch_size
num_classes = ds_info.features['label'].num_classes
if FLAGS.use_bfloat16:
policy = tf.keras.mixed_precision.experimental.Policy('mixed_bfloat16')
tf.keras.mixed_precision.experimental.set_policy(policy)
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.output_dir, 'summaries'))
with strategy.scope():
logging.info('Building Keras model')
model = cifar_model.wide_resnet(
input_shape=[FLAGS.ensemble_size] +
list(ds_info.features['image'].shape),
depth=28,
width_multiplier=FLAGS.width_multiplier,
num_classes=num_classes,
ensemble_size=FLAGS.ensemble_size)
logging.info('Model input shape: %s', model.input_shape)
logging.info('Model output shape: %s', model.output_shape)
logging.info('Model number of weights: %s', model.count_params())
# Linearly scale learning rate and the decay epochs by vanilla settings.
base_lr = FLAGS.base_learning_rate * train_batch_size / 128
lr_decay_epochs = [(int(start_epoch_str) * FLAGS.train_epochs) // 200
for start_epoch_str in FLAGS.lr_decay_epochs]
lr_schedule = utils.LearningRateSchedule(steps_per_epoch, base_lr,
FLAGS.lr_decay_ratio,
lr_decay_epochs,
FLAGS.lr_warmup_epochs)
optimizer = tf.keras.optimizers.SGD(lr_schedule,
momentum=0.9,
nesterov=True)
metrics = {
'train/negative_log_likelihood': tf.keras.metrics.Mean(),
'train/accuracy': tf.keras.metrics.SparseCategoricalAccuracy(),
'train/loss': tf.keras.metrics.Mean(),
'train/ece': um.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'test/negative_log_likelihood': tf.keras.metrics.Mean(),
'test/accuracy': tf.keras.metrics.SparseCategoricalAccuracy(),
'test/ece': um.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
}
if FLAGS.corruptions_interval > 0:
corrupt_metrics = {}
for intensity in range(1, max_intensity + 1):
for corruption in corruption_types:
dataset_name = '{0}_{1}'.format(corruption, intensity)
corrupt_metrics['test/nll_{}'.format(dataset_name)] = (
tf.keras.metrics.Mean())
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
corrupt_metrics['test/ece_{}'.format(dataset_name)] = (
um.ExpectedCalibrationError(num_bins=FLAGS.num_bins))
for i in range(FLAGS.ensemble_size):
metrics['test/nll_member_{}'.format(i)] = tf.keras.metrics.Mean()
metrics['test/accuracy_member_{}'.format(i)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
test_diversity = {
'test/disagreement': tf.keras.metrics.Mean(),
'test/average_kl': tf.keras.metrics.Mean(),
'test/cosine_similarity': tf.keras.metrics.Mean(),
}
checkpoint = tf.train.Checkpoint(model=model, optimizer=optimizer)
latest_checkpoint = tf.train.latest_checkpoint(FLAGS.output_dir)
initial_epoch = 0
if latest_checkpoint:
# checkpoint.restore must be within a strategy.scope() so that optimizer
# slot variables are mirrored.
checkpoint.restore(latest_checkpoint)
logging.info('Loaded checkpoint %s', latest_checkpoint)
initial_epoch = optimizer.iterations.numpy() // steps_per_epoch
@tf.function
def train_step(iterator):
"""Training StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
batch_size = tf.shape(images)[0]
main_shuffle = tf.random.shuffle(
tf.tile(tf.range(batch_size), [FLAGS.batch_repetitions]))
to_shuffle = tf.cast(
tf.cast(tf.shape(main_shuffle)[0], tf.float32) *
(1. - FLAGS.input_repetition_probability), tf.int32)
shuffle_indices = [
tf.concat([
tf.random.shuffle(main_shuffle[:to_shuffle]),
main_shuffle[to_shuffle:]
],
axis=0) for _ in range(FLAGS.ensemble_size)
]
images = tf.stack([
tf.gather(images, indices, axis=0)
for indices in shuffle_indices
],
axis=1)
labels = tf.stack([
tf.gather(labels, indices, axis=0)
for indices in shuffle_indices
],
axis=1)
with tf.GradientTape() as tape:
logits = model(images, training=True)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
negative_log_likelihood = tf.reduce_mean(
tf.reduce_sum(
tf.keras.losses.sparse_categorical_crossentropy(
labels, logits, from_logits=True),
axis=1))
filtered_variables = []
for var in model.trainable_variables:
# Apply l2 on the BN parameters and bias terms.
if ('kernel' in var.name or 'batch_norm' in var.name
or 'bias' in var.name):
filtered_variables.append(tf.reshape(var, (-1, )))
l2_loss = FLAGS.l2 * 2 * tf.nn.l2_loss(
tf.concat(filtered_variables, axis=0))
# Scale the loss given the TPUStrategy will reduce sum all gradients.
loss = negative_log_likelihood + l2_loss
scaled_loss = loss / strategy.num_replicas_in_sync
grads = tape.gradient(scaled_loss, model.trainable_variables)
optimizer.apply_gradients(zip(grads, model.trainable_variables))
probs = tf.nn.softmax(tf.reshape(logits, [-1, num_classes]))
flat_labels = tf.reshape(labels, [-1])
metrics['train/ece'].update_state(flat_labels, probs)
metrics['train/loss'].update_state(loss)
metrics['train/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['train/accuracy'].update_state(flat_labels, probs)
strategy.run(step_fn, args=(next(iterator), ))
@tf.function
def test_step(iterator, dataset_name):
"""Evaluation StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
images = tf.tile(tf.expand_dims(images, 1),
[1, FLAGS.ensemble_size, 1, 1, 1])
logits = model(images, training=False)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
probs = tf.nn.softmax(logits)
if dataset_name == 'clean':
per_probs = tf.transpose(probs, perm=[1, 0, 2])
diversity_results = um.average_pairwise_diversity(
per_probs, FLAGS.ensemble_size)
for k, v in diversity_results.items():
test_diversity['test/' + k].update_state(v)
for i in range(FLAGS.ensemble_size):
member_probs = probs[:, i]
member_loss = tf.keras.losses.sparse_categorical_crossentropy(
labels, member_probs)
metrics['test/nll_member_{}'.format(i)].update_state(
member_loss)
metrics['test/accuracy_member_{}'.format(i)].update_state(
labels, member_probs)
# Negative log marginal likelihood computed in a numerically-stable way.
labels_tiled = tf.tile(tf.expand_dims(labels, 1),
[1, FLAGS.ensemble_size])
log_likelihoods = -tf.keras.losses.sparse_categorical_crossentropy(
labels_tiled, logits, from_logits=True)
negative_log_likelihood = tf.reduce_mean(
-tf.reduce_logsumexp(log_likelihoods, axis=[1]) +
tf.math.log(float(FLAGS.ensemble_size)))
probs = tf.math.reduce_mean(probs, axis=1) # marginalize
if dataset_name == 'clean':
metrics['test/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['test/accuracy'].update_state(labels, probs)
metrics['test/ece'].update_state(labels, probs)
else:
corrupt_metrics['test/nll_{}'.format(
dataset_name)].update_state(negative_log_likelihood)
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)].update_state(labels, probs)
corrupt_metrics['test/ece_{}'.format(
dataset_name)].update_state(labels, probs)
strategy.run(step_fn, args=(next(iterator), ))
metrics.update({'test/ms_per_example': tf.keras.metrics.Mean()})
train_iterator = iter(train_dataset)
start_time = time.time()
for epoch in range(initial_epoch, FLAGS.train_epochs):
logging.info('Starting to run epoch: %s', epoch)
for step in range(steps_per_epoch):
train_step(train_iterator)
current_step = epoch * steps_per_epoch + (step + 1)
max_steps = steps_per_epoch * (FLAGS.train_epochs)
time_elapsed = time.time() - start_time
steps_per_sec = float(current_step) / time_elapsed
eta_seconds = (max_steps - current_step) / steps_per_sec
message = ('{:.1%} completion: epoch {:d}/{:d}. {:.1f} steps/s. '
'ETA: {:.0f} min. Time elapsed: {:.0f} min'.format(
current_step / max_steps, epoch + 1,
FLAGS.train_epochs, steps_per_sec, eta_seconds / 60,
time_elapsed / 60))
if step % 20 == 0:
logging.info(message)
datasets_to_evaluate = {'clean': test_datasets['clean']}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
datasets_to_evaluate = test_datasets
for dataset_name, test_dataset in datasets_to_evaluate.items():
test_iterator = iter(test_dataset)
logging.info('Testing on dataset %s', dataset_name)
for step in range(steps_per_eval):
if step % 20 == 0:
logging.info('Starting to run eval step %s of epoch: %s',
step, epoch)
test_start_time = time.time()
test_step(test_iterator, dataset_name)
ms_per_example = (time.time() -
test_start_time) * 1e6 / test_batch_size
metrics['test/ms_per_example'].update_state(ms_per_example)
logging.info('Done with testing on %s', dataset_name)
corrupt_results = {}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
corrupt_results = utils.aggregate_corrupt_metrics(
corrupt_metrics, corruption_types, max_intensity)
logging.info('Train Loss: %.4f, Accuracy: %.2f%%',
metrics['train/loss'].result(),
metrics['train/accuracy'].result() * 100)
logging.info('Test NLL: %.4f, Accuracy: %.2f%%',
metrics['test/negative_log_likelihood'].result(),
metrics['test/accuracy'].result() * 100)
for i in range(FLAGS.ensemble_size):
logging.info(
'Member %d Test Loss: %.4f, Accuracy: %.2f%%', i,
metrics['test/nll_member_{}'.format(i)].result(),
metrics['test/accuracy_member_{}'.format(i)].result() * 100)
metrics.update(test_diversity)
total_results = {
name: metric.result()
for name, metric in metrics.items()
}
total_results.update(corrupt_results)
with summary_writer.as_default():
for name, result in total_results.items():
tf.summary.scalar(name, result, step=epoch + 1)
for metric in metrics.values():
metric.reset_states()
if (FLAGS.checkpoint_interval > 0
and (epoch + 1) % FLAGS.checkpoint_interval == 0):
checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved checkpoint to %s', checkpoint_name)
final_checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved last checkpoint to %s', final_checkpoint_name)
def run(flags_obj, datasets_override=None, strategy_override=None):
"""Run MNIST model training and eval loop using native Keras APIs.
Args:
flags_obj: An object containing parsed flag values.
datasets_override: A pair of `tf.data.Dataset` objects to train the model,
representing the train and test sets.
strategy_override: A `tf.distribute.Strategy` object to use for model.
Returns:
Dictionary of training and eval stats.
"""
strategy = strategy_override or distribute_utils.get_distribution_strategy(
distribution_strategy=flags_obj.distribution_strategy,
num_gpus=flags_obj.num_gpus,
tpu_address=flags_obj.tpu)
strategy_scope = distribute_utils.get_strategy_scope(strategy)
mnist = tfds.builder('mnist', data_dir=flags_obj.data_dir)
if flags_obj.download:
mnist.download_and_prepare()
mnist_train, mnist_test = datasets_override or mnist.as_dataset(
split=['train', 'test'],
decoders={'image': decode_image()}, # pylint: disable=no-value-for-parameter
as_supervised=True)
train_input_dataset = mnist_train.cache().repeat().shuffle(
buffer_size=50000).batch(flags_obj.batch_size)
eval_input_dataset = mnist_test.cache().repeat().batch(
flags_obj.batch_size)
with strategy_scope:
lr_schedule = tf.keras.optimizers.schedules.ExponentialDecay(
0.05, decay_steps=100000, decay_rate=0.96)
optimizer = tf.keras.optimizers.SGD(learning_rate=lr_schedule)
model = build_model()
model.compile(optimizer=optimizer,
loss='sparse_categorical_crossentropy',
metrics=['sparse_categorical_accuracy'])
num_train_examples = mnist.info.splits['train'].num_examples
train_steps = num_train_examples // flags_obj.batch_size
train_epochs = flags_obj.train_epochs
ckpt_full_path = os.path.join(flags_obj.model_dir,
'model.ckpt-{epoch:04d}')
callbacks = [
tf.keras.callbacks.ModelCheckpoint(ckpt_full_path,
save_weights_only=True),
tf.keras.callbacks.TensorBoard(log_dir=flags_obj.model_dir),
]
num_eval_examples = mnist.info.splits['test'].num_examples
num_eval_steps = num_eval_examples // flags_obj.batch_size
history = model.fit(train_input_dataset,
epochs=train_epochs,
steps_per_epoch=train_steps,
callbacks=callbacks,
validation_steps=num_eval_steps,
validation_data=eval_input_dataset,
validation_freq=flags_obj.epochs_between_evals)
export_path = os.path.join(flags_obj.model_dir, 'saved_model')
model.save(export_path, include_optimizer=False)
eval_output = model.evaluate(eval_input_dataset,
steps=num_eval_steps,
verbose=2)
stats = common.build_stats(history, eval_output, callbacks)
return stats
from config import Config
output_dir = Config['output_dir']
en_vocab_file = os.path.join(output_dir, 'en_vocab')
zh_vocab_file = os.path.join(output_dir, 'zh_vocab')
checkpoint_path = os.path.join(output_dir, 'checkpoints')
log_dir = os.path.join(output_dir, 'logs')
if not os.path.exists(output_dir):
os.makedirs(output_dir)
ds_config = tfds.translate.wmt.WmtConfig(
version='1.0.0',
language_pair=('zh', 'en'),
subsets={tfds.Split.TRAIN: ['newscommentary_v14']})
builder = tfds.builder('wmt_translate', config=ds_config)
builder.download_and_prepare()
train_examples, val_examples = builder.as_dataset(
split=['train[:30%]', 'train[30%:31%]'], as_supervised=True)
print('-' * 50)
try:
subword_encoder_en = tfds.features.text.SubwordTextEncoder.load_from_file(
en_vocab_file)
print(f'Load builded corpus: {en_vocab_file}')
except:
print(f'Build corpus: {en_vocab_file}')
subword_encoder_en = tfds.features.text.SubwordTextEncoder.build_from_corpus(
(en.numpy() for en, _ in train_examples), target_vocab_size=2**13)
subword_encoder_en.save_to_file(en_vocab_file)
def fetch_data_via_tf_datasets(dataset_name):
builder = tfds.builder(name=dataset_name)
builder.download_and_prepare()
data = builder.as_dataset(shuffle_files=False)
return data
def main(argv):
if len(argv) > 1:
raise app.UsageError('Too many command-line arguments.')
# Enable training summary.
if FLAGS.train_summary_steps > 0:
tf.config.set_soft_device_placement(True)
builder = tfds.builder(FLAGS.dataset, data_dir=FLAGS.data_dir)
builder.download_and_prepare()
num_train_examples = builder.info.splits[FLAGS.train_split].num_examples
num_eval_examples = builder.info.splits[FLAGS.eval_split].num_examples
num_classes = builder.info.features['label'].num_classes
train_steps = model_util.get_train_steps(num_train_examples)
eval_steps = int(math.ceil(num_eval_examples / FLAGS.eval_batch_size))
epoch_steps = int(round(num_train_examples / FLAGS.train_batch_size))
resnet.BATCH_NORM_DECAY = FLAGS.batch_norm_decay
model = resnet.resnet_v1(resnet_depth=FLAGS.resnet_depth,
width_multiplier=FLAGS.width_multiplier,
cifar_stem=FLAGS.image_size <= 32)
checkpoint_steps = (FLAGS.checkpoint_steps
or (FLAGS.checkpoint_epochs * epoch_steps))
cluster = None
if FLAGS.use_tpu and FLAGS.master is None:
if FLAGS.tpu_name:
cluster = tf.distribute.cluster_resolver.TPUClusterResolver(
FLAGS.tpu_name, zone=FLAGS.tpu_zone, project=FLAGS.gcp_project)
else:
cluster = tf.distribute.cluster_resolver.TPUClusterResolver()
tf.config.experimental_connect_to_cluster(cluster)
tf.tpu.experimental.initialize_tpu_system(cluster)
default_eval_mode = tf.estimator.tpu.InputPipelineConfig.PER_HOST_V1
sliced_eval_mode = tf.estimator.tpu.InputPipelineConfig.SLICED
run_config = tf.estimator.tpu.RunConfig(
tpu_config=tf.estimator.tpu.TPUConfig(
iterations_per_loop=checkpoint_steps,
eval_training_input_configuration=sliced_eval_mode
if FLAGS.use_tpu else default_eval_mode),
model_dir=FLAGS.model_dir,
save_summary_steps=checkpoint_steps,
save_checkpoints_steps=checkpoint_steps,
keep_checkpoint_max=FLAGS.keep_checkpoint_max,
master=FLAGS.master,
cluster=cluster)
estimator = tf.estimator.tpu.TPUEstimator(
model_lib.build_model_fn(model, num_classes, num_train_examples),
config=run_config,
train_batch_size=FLAGS.train_batch_size,
eval_batch_size=FLAGS.eval_batch_size,
use_tpu=FLAGS.use_tpu)
if FLAGS.mode == 'eval':
for ckpt in tf.train.checkpoints_iterator(run_config.model_dir,
min_interval_secs=15):
try:
result = perform_evaluation(estimator=estimator,
input_fn=data_lib.build_input_fn(
builder, False),
eval_steps=eval_steps,
model=model,
num_classes=num_classes,
checkpoint_path=ckpt)
except tf.errors.NotFoundError:
continue
if result['global_step'] >= train_steps:
return
else:
estimator.train(data_lib.build_input_fn(builder, True),
max_steps=train_steps)
if FLAGS.mode == 'train_then_eval':
perform_evaluation(estimator=estimator,
input_fn=data_lib.build_input_fn(
builder, False),
eval_steps=eval_steps,
model=model,
num_classes=num_classes)
def get_uniform_size_builder(num_points=1024):
if num_points != 1024:
raise NotImplementedError()
return tfds.builder('modelnet40/cloud1024')
def __init__(self,
params: cfg.DataConfig,
dataset_fn=tf.data.TFRecordDataset,
decoder_fn: Optional[Callable[..., Any]] = None,
combine_fn: Optional[Callable[..., Any]] = None,
sample_fn: Optional[Callable[..., Any]] = None,
parser_fn: Optional[Callable[..., Any]] = None,
transform_and_batch_fn: Optional[Callable[
[tf.data.Dataset, Optional[tf.distribute.InputContext]],
tf.data.Dataset]] = None,
postprocess_fn: Optional[Callable[..., Any]] = None):
"""Initializes an InputReader instance.
Args:
params: A config_definitions.DataConfig object.
dataset_fn: A `tf.data.Dataset` that consumes the input files. For
example, it can be `tf.data.TFRecordDataset`.
decoder_fn: An optional `callable` that takes the serialized data string
and decodes them into the raw tensor dictionary.
combine_fn: An optional `callable` that takes a dictionarty of
`tf.data.Dataset` objects as input and outputs a combined dataset. It
will be executed after the decoder_fn and before the sample_fn.
sample_fn: An optional `callable` that takes a `tf.data.Dataset` object as
input and outputs the transformed dataset. It performs sampling on the
decoded raw tensors dict before the parser_fn.
parser_fn: An optional `callable` that takes the decoded raw tensors dict
and parse them into a dictionary of tensors that can be consumed by the
model. It will be executed after decoder_fn.
transform_and_batch_fn: An optional `callable` that takes a
`tf.data.Dataset` object and an optional `tf.distribute.InputContext` as
input, and returns a `tf.data.Dataset` object. It will be executed after
`parser_fn` to transform and batch the dataset; if None, after
`parser_fn` is executed, the dataset will be batched into per-replica
batch size.
postprocess_fn: A optional `callable` that processes batched tensors. It
will be executed after batching.
"""
if params.input_path and params.tfds_name:
raise ValueError(
'At most one of `input_path` and `tfds_name` can be '
'specified, but got %s and %s.' %
(params.input_path, params.tfds_name))
if isinstance(params.input_path,
cfg.base_config.Config) and combine_fn is None:
raise ValueError(
'A `combine_fn` is required if the `input_path` is a dictionary.'
)
self._tfds_builder = None
self._matched_files = None
if not params.input_path:
# Read dataset from TFDS.
if not params.tfds_split:
raise ValueError(
'`tfds_name` is %s, but `tfds_split` is not specified.' %
params.tfds_name)
self._tfds_builder = tfds.builder(params.tfds_name,
data_dir=params.tfds_data_dir)
else:
self._matched_files = self.get_files(params.input_path)
self._global_batch_size = params.global_batch_size
self._is_training = params.is_training
self._drop_remainder = params.drop_remainder
self._shuffle_buffer_size = params.shuffle_buffer_size
self._cache = params.cache
self._cycle_length = params.cycle_length
self._block_length = params.block_length
self._deterministic = params.deterministic
self._sharding = params.sharding
self._tfds_split = params.tfds_split
self._tfds_as_supervised = params.tfds_as_supervised
self._tfds_skip_decoding_feature = params.tfds_skip_decoding_feature
self._dataset_fn = dataset_fn
self._decoder_fn = decoder_fn
self._combine_fn = combine_fn
self._sample_fn = sample_fn
self._parser_fn = parser_fn
self._transform_and_batch_fn = transform_and_batch_fn
self._postprocess_fn = postprocess_fn
self._seed = params.seed
# When tf.data service is enabled, each data service worker should get
# different random seeds. Thus, we set `seed` to None.
# Sharding should also be disabled because tf data service handles how
# each worker shard data with `processing_mode` in distribute method.
if params.enable_tf_data_service:
self._seed = None
self._sharding = False
self._enable_tf_data_service = (params.enable_tf_data_service
and params.tf_data_service_address)
self._tf_data_service_address = params.tf_data_service_address
if self._enable_tf_data_service:
# Add a random seed as the tf.data service job name suffix, so tf.data
# service doesn't reuse the previous state if TPU worker gets preempted.
# It's necessary to add global batch size into the tf data service job
# name because when tuning batch size with vizier and tf data service is
# also enable, the tf data servce job name should be different for
# different vizier trials since once batch size is changed, from the
# tf.data perspective, the dataset is a different instance, and a
# different job name should be used for tf data service. Otherwise, the
# model would read tensors from the incorrect tf data service job, which
# would causes dimension mismatch on the batch size dimension.
self._tf_data_service_job_name = (
f'{params.tf_data_service_job_name}_bs{params.global_batch_size}_'
f'{self.static_randnum}')
self._enable_round_robin_tf_data_service = params.get(
'enable_round_robin_tf_data_service', False)
def main(argv):
del argv
builder = tfds.builder('imagenet2012', version='5.1.0')
decoders = {'image': tfds.decode.SkipDecoding()}
read_config = tfds.ReadConfig(interleave_cycle_length=96,
interleave_block_length=2)
train_dataset_size = builder.info.splits[tfds.Split.TRAIN].num_examples
train_split = tfds.Split.TRAIN
if FLAGS.subsample:
train_dataset_size = int(round(train_dataset_size * FLAGS.subsample))
train_split = tfds.core.ReadInstruction(train_split,
to=FLAGS.subsample * 100,
unit='%')
train_dataset = builder.as_dataset(train_split,
decoders=decoders,
shuffle_files=False,
read_config=read_config).cache()
train_dataset = train_dataset.shuffle(train_dataset_size).repeat()
train_dataset = train_dataset.map(
functools.partial(preprocess_data, is_training=True),
num_parallel_calls=tf.data.experimental.AUTOTUNE)
train_dataset = train_dataset.batch(FLAGS.batch_size, drop_remainder=True)
train_dataset = train_dataset.prefetch(tf.data.experimental.AUTOTUNE)
test_dataset = builder.as_dataset(tfds.Split.VALIDATION, decoders=decoders)
test_dataset = test_dataset.map(
functools.partial(preprocess_data, is_training=False),
num_parallel_calls=tf.data.experimental.AUTOTUNE).cache()
test_dataset = test_dataset.batch(FLAGS.batch_size)
test_dataset = test_dataset.prefetch(tf.data.experimental.AUTOTUNE)
test_dataset_size = builder.info.splits[tfds.Split.VALIDATION].num_examples
steps_per_epoch = train_dataset_size // FLAGS.batch_size
steps_between_evals = int(FLAGS.epochs_between_evals * steps_per_epoch)
train_steps = FLAGS.epochs * steps_per_epoch
eval_steps = ((test_dataset_size - 1) // FLAGS.batch_size) + 1
model_dir_name = (
'%s-depth-%s-width-%s-bs-%d-lr-%f-reg-%f-dropout-%f-aa-%s' % \
(FLAGS.model, FLAGS.depth_multiplier, FLAGS.width_multiplier,
FLAGS.batch_size, FLAGS.learning_rate, FLAGS.weight_decay,
FLAGS.dropout_rate, FLAGS.use_autoaugment))
if FLAGS.copy > 0:
model_dir_name += '-copy-%d' % FLAGS.copy
experiment_dir = os.path.join(FLAGS.base_dir, model_dir_name)
def model_optimizer_fn():
schedule = tf.keras.experimental.CosineDecay(FLAGS.learning_rate,
train_steps)
if FLAGS.model == 'efficientnet':
config = efficientnet_model.ModelConfig.from_args(
width_coefficient=FLAGS.width_multiplier,
depth_coefficient=FLAGS.depth_multiplier,
resolution=224,
weight_decay=FLAGS.weight_decay,
dropout_rate=FLAGS.dropout_rate)
model = efficientnet_model.EfficientNet(config)
elif FLAGS.model == 'resnet':
model = alt_resnet.Resnet(
block_fn=alt_resnet.BottleneckBlock,
layers=[3, 4, int(round(FLAGS.depth_multiplier * 6)), 3],
width_multipliers=[1, 1, 1, FLAGS.width_multiplier, 1],
num_classes=1000,
kernel_regularizer=tf.keras.regularizers.l2(
FLAGS.weight_decay))
elif FLAGS.model == 'resnet_scale_all':
model = alt_resnet.Resnet(
block_fn=alt_resnet.BottleneckBlock,
layers=[
int(round(FLAGS.depth_multiplier * x))
for x in [3, 4, 6, 3]
],
width_multipliers=[1] + [FLAGS.width_multiplier] * 4,
num_classes=1000,
kernel_regularizer=tf.keras.regularizers.l2(
FLAGS.weight_decay))
else:
raise ValueError('Unknown model {}'.format(FLAGS.model))
optimizer = tf.keras.optimizers.SGD(schedule, momentum=0.9)
return model, optimizer
train_lib.train(model_optimizer_fn=model_optimizer_fn,
train_steps=train_steps,
eval_steps=eval_steps,
steps_between_evals=steps_between_evals,
train_dataset=train_dataset,
test_dataset=test_dataset,
experiment_dir=experiment_dir)
seed = np.random.randint(0, 100000, 10000)
data = data[0][seed]
TIM = data
data = 1
TIM = np.reshape(TIM, [10000, 64, 64, 3]) / 255.
TIM1 = []
for i in range(len(TIM)):
im = cv2.resize(TIM[i], dsize=(32, 32), interpolation=cv2.INTER_CUBIC)
TIM1.append(im)
TIM1 = np.array(TIM1)
np.save("TIM", TIM1)
TIM1 = 1
#TIM = np.load("./TIM.npy")
# get LSUN data
data, info = tfds.load("lsun", with_info=True)
train_data = data['train']
builder = tfds.builder("lsun")
builder.download_and_prepare()
datasets = builder.as_dataset()
np_datasets = tfds.as_numpy(datasets)
np_datasets
LSUN = []
for example in np_datasets["train"]:
image = example['image']
res = cv2.resize(image, dsize=(32, 32), interpolation=cv2.INTER_CUBIC)
LSUN.append(res)
LSUN = np.array(LSUN)
np.save("LSUN.npy", LSUN[:10000])
def _train_and_eval_dataset(dataset_name,
data_dir,
eval_holdout_size,
train_shuffle_files=True,
eval_shuffle_files=False):
"""Return train and evaluation datasets, feature info and supervised keys.
Args:
dataset_name: a string, the name of the dataset; if it starts with 't2t_'
then we'll search T2T Problem registry for it, otherwise we assume it
is a dataset from TFDS and load it from there.
data_dir: directory where the data is located.
eval_holdout_size: float from 0 to <1; if >0 use this much of training data
for evaluation (instead of looking for a pre-specified VALIDATION split).
train_shuffle_files: Boolean determining whether or not to shuffle the train
files at startup. Set to False if you want data determinism.
eval_shuffle_files: Boolean determining whether or not to shuffle the test
files at startup. Set to False if you want data determinism.
Returns:
a 4-tuple consisting of:
* the train tf.Dataset
* the eval tf.Dataset
* information about features: a python dictionary with feature names
as keys and an object as value that provides .shape and .n_classes.
* supervised_keys: information what's the input and what's the target,
ie., a pair of lists with input and target feature names.
"""
if dataset_name.startswith('t2t_'):
return _train_and_eval_dataset_v1(dataset_name[4:], data_dir,
train_shuffle_files,
eval_shuffle_files)
dataset_builder = tfds.builder(dataset_name, data_dir=data_dir)
info = dataset_builder.info
splits = dataset_builder.info.splits
if tfds.Split.TRAIN not in splits:
raise ValueError('To train we require a train split in the dataset.')
train_split = tfds.Split.TRAIN
if eval_holdout_size > 0:
holdout_percentage = int(eval_holdout_size * 100.0)
train_percentage = 100 - holdout_percentage
train_split = f'train[:{train_percentage}%]'
eval_split = f'train[{train_percentage}%:]'
else:
if tfds.Split.VALIDATION not in splits and 'test' not in splits:
raise ValueError(
'We require a validation or test split in the dataset.')
eval_split = tfds.Split.VALIDATION
if tfds.Split.VALIDATION not in splits:
eval_split = tfds.Split.TEST
train = tfds.load(name=dataset_name,
split=train_split,
data_dir=data_dir,
shuffle_files=train_shuffle_files)
valid = tfds.load(name=dataset_name,
split=eval_split,
data_dir=data_dir,
shuffle_files=eval_shuffle_files)
keys = None
if info.supervised_keys:
keys = ([info.supervised_keys[0]], [info.supervised_keys[1]])
return train, valid, keys
def main(argv):
del argv # unused arg
tf.io.gfile.makedirs(FLAGS.output_dir)
logging.info('Saving checkpoints at %s', FLAGS.output_dir)
tf.random.set_seed(FLAGS.seed)
ds_info = tfds.builder(FLAGS.dataset).info
per_core_batch_size = FLAGS.per_core_batch_size // FLAGS.ensemble_size
batch_size = per_core_batch_size * FLAGS.num_cores
# Train_proportion is a float so need to convert steps_per_epoch to int.
steps_per_epoch = int(
(ds_info.splits['train'].num_examples * FLAGS.train_proportion) //
batch_size)
steps_per_eval = ds_info.splits['test'].num_examples // batch_size
num_classes = ds_info.features['label'].num_classes
if FLAGS.use_gpu:
logging.info('Use GPU')
strategy = tf.distribute.MirroredStrategy()
else:
logging.info('Use TPU at %s',
FLAGS.tpu if FLAGS.tpu is not None else 'local')
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=FLAGS.tpu)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
train_dataset = utils.load_dataset(split=tfds.Split.TRAIN,
name=FLAGS.dataset,
batch_size=batch_size,
use_bfloat16=FLAGS.use_bfloat16,
proportion=FLAGS.train_proportion)
clean_test_dataset = utils.load_dataset(split=tfds.Split.TEST,
name=FLAGS.dataset,
batch_size=batch_size,
use_bfloat16=FLAGS.use_bfloat16)
train_dataset = strategy.experimental_distribute_dataset(train_dataset)
test_datasets = {
'clean': strategy.experimental_distribute_dataset(clean_test_dataset),
}
if FLAGS.corruptions_interval > 0:
if FLAGS.dataset == 'cifar10':
load_c_dataset = utils.load_cifar10_c
else:
load_c_dataset = functools.partial(utils.load_cifar100_c,
path=FLAGS.cifar100_c_path)
corruption_types, max_intensity = utils.load_corrupted_test_info(
FLAGS.dataset)
for corruption in corruption_types:
for intensity in range(1, max_intensity + 1):
dataset = load_c_dataset(corruption_name=corruption,
corruption_intensity=intensity,
batch_size=batch_size,
use_bfloat16=FLAGS.use_bfloat16)
test_datasets['{0}_{1}'.format(corruption, intensity)] = (
strategy.experimental_distribute_dataset(dataset))
if FLAGS.use_bfloat16:
policy = tf.keras.mixed_precision.experimental.Policy('mixed_bfloat16')
tf.keras.mixed_precision.experimental.set_policy(policy)
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.output_dir, 'summaries'))
with strategy.scope():
logging.info('Building Keras model')
model = ub.models.wide_resnet_sngp_be(
input_shape=ds_info.features['image'].shape,
batch_size=batch_size,
depth=28,
width_multiplier=10,
num_classes=num_classes,
ensemble_size=FLAGS.ensemble_size,
random_sign_init=FLAGS.random_sign_init,
l2=FLAGS.l2,
use_gp_layer=FLAGS.use_gp_layer,
gp_input_dim=FLAGS.gp_input_dim,
gp_hidden_dim=FLAGS.gp_hidden_dim,
gp_scale=FLAGS.gp_scale,
gp_bias=FLAGS.gp_bias,
gp_input_normalization=FLAGS.gp_input_normalization,
gp_cov_discount_factor=FLAGS.gp_cov_discount_factor,
gp_cov_ridge_penalty=FLAGS.gp_cov_ridge_penalty,
use_spec_norm=FLAGS.use_spec_norm,
spec_norm_iteration=FLAGS.spec_norm_iteration,
spec_norm_bound=FLAGS.spec_norm_bound)
logging.info('Model input shape: %s', model.input_shape)
logging.info('Model output shape: %s', model.output_shape)
logging.info('Model number of weights: %s', model.count_params())
# Linearly scale learning rate and the decay epochs by vanilla settings.
base_lr = FLAGS.base_learning_rate * batch_size / 128
lr_decay_epochs = [(int(start_epoch_str) * FLAGS.train_epochs) // 200
for start_epoch_str in FLAGS.lr_decay_epochs]
lr_schedule = utils.LearningRateSchedule(
steps_per_epoch,
base_lr,
decay_ratio=FLAGS.lr_decay_ratio,
decay_epochs=lr_decay_epochs,
warmup_epochs=FLAGS.lr_warmup_epochs)
optimizer = tf.keras.optimizers.SGD(lr_schedule,
momentum=0.9,
nesterov=True)
metrics = {
'train/negative_log_likelihood': tf.keras.metrics.Mean(),
'train/accuracy': tf.keras.metrics.SparseCategoricalAccuracy(),
'train/loss': tf.keras.metrics.Mean(),
'train/ece': um.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'test/negative_log_likelihood': tf.keras.metrics.Mean(),
'test/accuracy': tf.keras.metrics.SparseCategoricalAccuracy(),
'test/ece': um.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'test/stddev': tf.keras.metrics.Mean(),
}
for i in range(FLAGS.ensemble_size):
metrics['test/nll_member_{}'.format(i)] = tf.keras.metrics.Mean()
metrics['test/accuracy_member_{}'.format(i)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
if FLAGS.corruptions_interval > 0:
corrupt_metrics = {}
for intensity in range(1, max_intensity + 1):
for corruption in corruption_types:
dataset_name = '{0}_{1}'.format(corruption, intensity)
corrupt_metrics['test/nll_{}'.format(dataset_name)] = (
tf.keras.metrics.Mean())
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
corrupt_metrics['test/ece_{}'.format(dataset_name)] = (
um.ExpectedCalibrationError(num_bins=FLAGS.num_bins))
corrupt_metrics['test/stddev_{}'.format(dataset_name)] = (
tf.keras.metrics.Mean())
checkpoint = tf.train.Checkpoint(model=model, optimizer=optimizer)
latest_checkpoint = tf.train.latest_checkpoint(FLAGS.output_dir)
initial_epoch = 0
if latest_checkpoint:
# checkpoint.restore must be within a strategy.scope() so that optimizer
# slot variables are mirrored.
checkpoint.restore(latest_checkpoint)
logging.info('Loaded checkpoint %s', latest_checkpoint)
initial_epoch = optimizer.iterations.numpy() // steps_per_epoch
@tf.function
def train_step(iterator):
"""Training StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
images = tf.tile(images, [FLAGS.ensemble_size, 1, 1, 1])
labels = tf.tile(labels, [FLAGS.ensemble_size])
with tf.GradientTape() as tape:
logits = model(images, training=True)
if isinstance(logits, tuple):
# If model returns a tuple of (logits, covmat), extract logits
logits, _ = logits
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(
labels, logits, from_logits=True))
l2_loss = sum(model.losses)
loss = negative_log_likelihood + l2_loss
# Scale the loss given the TPUStrategy will reduce sum all gradients.
scaled_loss = loss / strategy.num_replicas_in_sync
grads = tape.gradient(scaled_loss, model.trainable_variables)
# Separate learning rate implementation.
if FLAGS.fast_weight_lr_multiplier != 1.0:
grads_and_vars = []
for grad, var in zip(grads, model.trainable_variables):
# Apply different learning rate on the fast weight approximate
# posterior/prior parameters. This is excludes BN and slow weights,
# but pay caution to the naming scheme.
if ('batch_norm' not in var.name
and 'kernel' not in var.name):
grads_and_vars.append(
(grad * FLAGS.fast_weight_lr_multiplier, var))
else:
grads_and_vars.append((grad, var))
optimizer.apply_gradients(grads_and_vars)
else:
optimizer.apply_gradients(zip(grads,
model.trainable_variables))
probs = tf.nn.softmax(logits)
metrics['train/ece'].update_state(labels, probs)
metrics['train/loss'].update_state(loss)
metrics['train/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['train/accuracy'].update_state(labels, logits)
strategy.run(step_fn, args=(next(iterator), ))
@tf.function
def test_step(iterator, dataset_name):
"""Evaluation StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
logits_list = []
stddev_list = []
for i in range(FLAGS.ensemble_size):
logits = model(images, training=False)
if isinstance(logits, tuple):
# If model returns a tuple of (logits, covmat), extract both
logits, covmat = logits
else:
covmat = tf.eye(FLAGS.per_core_batch_size)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
logits = mean_field_logits(
logits,
covmat,
mean_field_factor=FLAGS.gp_mean_field_factor)
stddev = tf.sqrt(tf.linalg.diag_part(covmat))
stddev_list.append(stddev)
logits_list.append(logits)
member_probs = tf.nn.softmax(logits)
member_loss = tf.keras.losses.sparse_categorical_crossentropy(
labels, member_probs)
metrics['test/nll_member_{}'.format(i)].update_state(
member_loss)
metrics['test/accuracy_member_{}'.format(i)].update_state(
labels, member_probs)
# Logits dimension is (num_samples, batch_size, num_classes).
logits_list = tf.stack(logits_list, axis=0)
stddev_list = tf.stack(stddev_list, axis=0)
stddev = tf.reduce_mean(stddev_list, axis=0)
probs_list = tf.nn.softmax(logits_list)
probs = tf.reduce_mean(probs_list, axis=0)
labels_broadcasted = tf.broadcast_to(
labels, [FLAGS.ensemble_size, labels.shape[0]])
log_likelihoods = -tf.keras.losses.sparse_categorical_crossentropy(
labels_broadcasted, logits_list, from_logits=True)
negative_log_likelihood = tf.reduce_mean(
-tf.reduce_logsumexp(log_likelihoods, axis=[0]) +
tf.math.log(float(FLAGS.ensemble_size)))
if dataset_name == 'clean':
metrics['test/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['test/accuracy'].update_state(labels, probs)
metrics['test/ece'].update_state(labels, probs)
metrics['test/stddev'].update_state(stddev)
else:
corrupt_metrics['test/nll_{}'.format(
dataset_name)].update_state(negative_log_likelihood)
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)].update_state(labels, probs)
corrupt_metrics['test/ece_{}'.format(
dataset_name)].update_state(labels, probs)
corrupt_metrics['test/stddev_{}'.format(
dataset_name)].update_state(stddev)
strategy.run(step_fn, args=(next(iterator), ))
metrics.update({'test/ms_per_example': tf.keras.metrics.Mean()})
train_iterator = iter(train_dataset)
start_time = time.time()
for epoch in range(initial_epoch, FLAGS.train_epochs):
logging.info('Starting to run epoch: %s', epoch)
for step in range(steps_per_epoch):
train_step(train_iterator)
current_step = epoch * steps_per_epoch + (step + 1)
max_steps = steps_per_epoch * FLAGS.train_epochs
time_elapsed = time.time() - start_time
steps_per_sec = float(current_step) / time_elapsed
eta_seconds = (max_steps - current_step) / steps_per_sec
message = ('{:.1%} completion: epoch {:d}/{:d}. {:.1f} steps/s. '
'ETA: {:.0f} min. Time elapsed: {:.0f} min'.format(
current_step / max_steps, epoch + 1,
FLAGS.train_epochs, steps_per_sec, eta_seconds / 60,
time_elapsed / 60))
if step % 20 == 0:
logging.info(message)
datasets_to_evaluate = {'clean': test_datasets['clean']}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
datasets_to_evaluate = test_datasets
for dataset_name, test_dataset in datasets_to_evaluate.items():
test_iterator = iter(test_dataset)
logging.info('Testing on dataset %s', dataset_name)
for step in range(steps_per_eval):
if step % 20 == 0:
logging.info('Starting to run eval step %s of epoch: %s',
step, epoch)
test_start_time = time.time()
test_step(test_iterator, dataset_name)
ms_per_example = (time.time() -
test_start_time) * 1e6 / batch_size
metrics['test/ms_per_example'].update_state(ms_per_example)
logging.info('Done with testing on %s', dataset_name)
corrupt_results = {}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
corrupt_results = utils.aggregate_corrupt_metrics(
corrupt_metrics, corruption_types, max_intensity)
logging.info('Train Loss: %.4f, Accuracy: %.2f%%',
metrics['train/loss'].result(),
metrics['train/accuracy'].result() * 100)
logging.info('Test NLL: %.4f, Accuracy: %.2f%%',
metrics['test/negative_log_likelihood'].result(),
metrics['test/accuracy'].result() * 100)
for i in range(FLAGS.ensemble_size):
logging.info(
'Member %d Test Loss: %.4f, Accuracy: %.2f%%', i,
metrics['test/nll_member_{}'.format(i)].result(),
metrics['test/accuracy_member_{}'.format(i)].result() * 100)
total_results = {
name: metric.result()
for name, metric in metrics.items()
}
total_results.update(corrupt_results)
with summary_writer.as_default():
for name, result in total_results.items():
tf.summary.scalar(name, result, step=epoch + 1)
for metric in metrics.values():
metric.reset_states()
if (FLAGS.checkpoint_interval > 0
and (epoch + 1) % FLAGS.checkpoint_interval == 0):
checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved checkpoint to %s', checkpoint_name)
final_checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved last checkpoint to %s', final_checkpoint_name)
def info(self):
if not hasattr(self, "_info"):
self._info = tfds.builder(self.name, data_dir=self.data_dir).info
return self._info
import tensorflow as tf
import tensorflow_datasets as tfds
import pickle
import time
import os
import datetime
# Imports with different functions to preprocess the dataset:
from snli_utils import get_vocab, gen_to_encoded_list, encoded_list_to_dataset
# Remember to set your own pickle directories as well as checkpoint and summary directories if you wish different ones.
# Get the dataset: -----------------------------------------------------------------------------------------------------
builder_obj = tfds.builder('snli')
print(builder_obj.info)
datasets_splits_dict = builder_obj.as_dataset() # returns all splits in a dict
train_dataset, val_dataset, test_dataset = datasets_splits_dict["train"], datasets_splits_dict["validation"], \
datasets_splits_dict["test"]
# Get the iterators to encode the elements into lists of integers representing the words for each sentence:
train_np, val_np, test_np = tfds.as_numpy(train_dataset), tfds.as_numpy(val_dataset), tfds.as_numpy(test_dataset)
# We first need the vocab ----------------------------------------------------------------------------------------------
if not os.path.isfile(r'./generator_vocab.pickle'):
# Get the vocabulary for the first time:
vocab = list(get_vocab([train_np, val_np, test_np]))
print("\nVocab ready!")
else:
# Get the vocab (obtained by 'get_vocab' function in snli_utils) from the pickle:
def main(argv):
del argv # unused arg
tf.io.gfile.makedirs(FLAGS.output_dir)
logging.info('Saving checkpoints at %s', FLAGS.output_dir)
tf.random.set_seed(FLAGS.seed)
if FLAGS.use_gpu:
logging.info('Use GPU')
strategy = tf.distribute.MirroredStrategy()
else:
logging.info('Use TPU at %s',
FLAGS.tpu if FLAGS.tpu is not None else 'local')
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=FLAGS.tpu)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
aug_params = {
'augmix': FLAGS.augmix,
'aug_count': FLAGS.aug_count,
'augmix_depth': FLAGS.augmix_depth,
'augmix_prob_coeff': FLAGS.augmix_prob_coeff,
'augmix_width': FLAGS.augmix_width,
'label_smoothing': FLAGS.label_smoothing,
'ensemble_size': FLAGS.ensemble_size,
'mixup_alpha': FLAGS.mixup_alpha,
'random_augment': FLAGS.random_augment,
'adaptive_mixup': FLAGS.adaptive_mixup,
'forget_mixup': FLAGS.forget_mixup,
'num_cores': FLAGS.num_cores,
'threshold': FLAGS.forget_threshold,
'cutmix': FLAGS.cutmix,
}
batch_size = ((FLAGS.per_core_batch_size // FLAGS.ensemble_size) *
FLAGS.num_cores)
train_input_fn = data_utils.load_input_fn(
split=tfds.Split.TRAIN,
name=FLAGS.dataset,
batch_size=batch_size,
use_bfloat16=FLAGS.use_bfloat16,
proportion=FLAGS.train_proportion,
validation_set=FLAGS.validation,
aug_params=aug_params)
if FLAGS.validation:
validation_input_fn = data_utils.load_input_fn(
split=tfds.Split.VALIDATION,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size,
use_bfloat16=FLAGS.use_bfloat16,
validation_set=True)
val_dataset = strategy.experimental_distribute_datasets_from_function(
validation_input_fn)
clean_test_input_fn = data_utils.load_input_fn(
split=tfds.Split.TEST,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size // FLAGS.ensemble_size,
use_bfloat16=FLAGS.use_bfloat16)
train_dataset = strategy.experimental_distribute_dataset(train_input_fn())
test_datasets = {
'clean':
strategy.experimental_distribute_datasets_from_function(
clean_test_input_fn),
}
if FLAGS.corruptions_interval > 0:
if FLAGS.dataset == 'cifar10':
load_c_dataset = utils.load_cifar10_c
else:
load_c_dataset = functools.partial(utils.load_cifar100_c,
path=FLAGS.cifar100_c_path)
corruption_types, max_intensity = utils.load_corrupted_test_info(
FLAGS.dataset)
for corruption in corruption_types:
for intensity in range(1, max_intensity + 1):
dataset = load_c_dataset(corruption_name=corruption,
corruption_intensity=intensity,
batch_size=batch_size,
use_bfloat16=FLAGS.use_bfloat16)
test_datasets['{0}_{1}'.format(corruption, intensity)] = (
strategy.experimental_distribute_dataset(dataset))
ds_info = tfds.builder(FLAGS.dataset).info
num_train_examples = ds_info.splits['train'].num_examples
# Train_proportion is a float so need to convert steps_per_epoch to int.
if FLAGS.validation:
# TODO(ywenxu): Remove hard-coding validation images.
steps_per_epoch = int(
(num_train_examples * FLAGS.train_proportion - 2500) // batch_size)
steps_per_val = 2500 // (FLAGS.per_core_batch_size * FLAGS.num_cores)
else:
steps_per_epoch = int(
num_train_examples * FLAGS.train_proportion) // batch_size
steps_per_eval = ds_info.splits['test'].num_examples // batch_size
num_classes = ds_info.features['label'].num_classes
if FLAGS.use_bfloat16:
policy = tf.keras.mixed_precision.experimental.Policy('mixed_bfloat16')
tf.keras.mixed_precision.experimental.set_policy(policy)
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.output_dir, 'summaries'))
with strategy.scope():
logging.info('Building Keras model')
model = batchensemble_model.wide_resnet(
input_shape=ds_info.features['image'].shape,
depth=28,
width_multiplier=10,
num_classes=num_classes,
ensemble_size=FLAGS.ensemble_size,
random_sign_init=FLAGS.random_sign_init,
l2=FLAGS.l2,
use_ensemble_bn=FLAGS.use_ensemble_bn)
logging.info('Model input shape: %s', model.input_shape)
logging.info('Model output shape: %s', model.output_shape)
logging.info('Model number of weights: %s', model.count_params())
# Linearly scale learning rate and the decay epochs by vanilla settings.
base_lr = FLAGS.base_learning_rate * batch_size / 128
lr_decay_epochs = [(int(start_epoch_str) * FLAGS.train_epochs) // 200
for start_epoch_str in FLAGS.lr_decay_epochs]
lr_schedule = utils.LearningRateSchedule(
steps_per_epoch,
base_lr,
decay_ratio=FLAGS.lr_decay_ratio,
decay_epochs=lr_decay_epochs,
warmup_epochs=FLAGS.lr_warmup_epochs)
optimizer = tf.keras.optimizers.SGD(lr_schedule,
momentum=0.9,
nesterov=True)
diversity_schedule = tf.keras.optimizers.schedules.ExponentialDecay(
FLAGS.diversity_coeff,
FLAGS.diversity_decay_epoch * steps_per_epoch,
decay_rate=0.97,
staircase=True)
metrics = {
'train/negative_log_likelihood':
tf.keras.metrics.Mean(),
'train/accuracy':
tf.keras.metrics.SparseCategoricalAccuracy(),
'train/loss':
tf.keras.metrics.Mean(),
'train/similarity':
tf.keras.metrics.Mean(),
'train/l2':
tf.keras.metrics.Mean(),
'train/ece':
um.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'test/negative_log_likelihood':
tf.keras.metrics.Mean(),
'test/accuracy':
tf.keras.metrics.SparseCategoricalAccuracy(),
'test/member_accuracy_mean':
(tf.keras.metrics.SparseCategoricalAccuracy()),
'test/ece':
um.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'test/member_ece_mean':
um.ExpectedCalibrationError(num_bins=FLAGS.num_bins)
}
for i in range(FLAGS.ensemble_size):
metrics['test/nll_member_{}'.format(i)] = tf.keras.metrics.Mean()
metrics['test/accuracy_member_{}'.format(i)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
metrics['test/ece_member_{}'.format(i)] = (
um.ExpectedCalibrationError(num_bins=FLAGS.num_bins))
test_diversity = {}
training_diversity = {}
corrupt_diversity = {}
if FLAGS.ensemble_size > 1:
test_diversity = {
'test/disagreement': tf.keras.metrics.Mean(),
'test/average_kl': tf.keras.metrics.Mean(),
'test/cosine_similarity': tf.keras.metrics.Mean(),
}
training_diversity = {
'train/disagreement': tf.keras.metrics.Mean(),
'train/average_kl': tf.keras.metrics.Mean(),
'train/cosine_similarity': tf.keras.metrics.Mean(),
}
if FLAGS.corruptions_interval > 0:
corrupt_metrics = {}
for intensity in range(1, max_intensity + 1):
for corruption in corruption_types:
dataset_name = '{0}_{1}'.format(corruption, intensity)
corrupt_metrics['test/nll_{}'.format(dataset_name)] = (
tf.keras.metrics.Mean())
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
corrupt_metrics['test/ece_{}'.format(dataset_name)] = (
um.ExpectedCalibrationError(num_bins=FLAGS.num_bins))
corrupt_metrics['test/member_acc_mean_{}'.format(
dataset_name)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
corrupt_metrics['test/member_ece_mean_{}'.format(
dataset_name)] = (um.ExpectedCalibrationError(
num_bins=FLAGS.num_bins))
corrupt_diversity['corrupt_diversity/average_kl_{}'.format(
dataset_name)] = tf.keras.metrics.Mean()
corrupt_diversity[
'corrupt_diversity/cosine_similarity_{}'.format(
dataset_name)] = tf.keras.metrics.Mean()
corrupt_diversity[
'corrupt_diversity/disagreement_{}'.format(
dataset_name)] = tf.keras.metrics.Mean()
checkpoint = tf.train.Checkpoint(model=model, optimizer=optimizer)
latest_checkpoint = tf.train.latest_checkpoint(FLAGS.output_dir)
initial_epoch = 0
if latest_checkpoint:
# checkpoint.restore must be within a strategy.scope() so that optimizer
# slot variables are mirrored.
checkpoint.restore(latest_checkpoint)
logging.info('Loaded checkpoint %s', latest_checkpoint)
initial_epoch = optimizer.iterations.numpy() // steps_per_epoch
@tf.function
def train_step(iterator):
"""Training StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
if FLAGS.forget_mixup:
images, labels, idx = inputs
else:
images, labels = inputs
if FLAGS.adaptive_mixup or FLAGS.forget_mixup:
images = tf.identity(images)
elif FLAGS.augmix or FLAGS.random_augment:
images_shape = tf.shape(images)
images = tf.reshape(
tf.transpose(images, [1, 0, 2, 3, 4]),
[-1, images_shape[2], images_shape[3], images_shape[4]])
else:
images = tf.tile(images, [FLAGS.ensemble_size, 1, 1, 1])
# Augmix, adaptive mixup, forget mixup preprocessing gives tiled labels.
if FLAGS.mixup_alpha > 0 or FLAGS.label_smoothing > 0 or FLAGS.cutmix:
if FLAGS.augmix or FLAGS.adaptive_mixup or FLAGS.forget_mixup:
labels = tf.identity(labels)
else:
labels = tf.tile(labels, [FLAGS.ensemble_size, 1])
else:
labels = tf.tile(labels, [FLAGS.ensemble_size])
def _is_batch_norm(v):
"""Decide whether a variable belongs to `batch_norm`."""
keywords = ['batchnorm', 'batch_norm', 'bn']
return any([k in v.name.lower() for k in keywords])
def _normalize(x):
"""Normalize an input with l2 norm."""
l2 = tf.norm(x, ord=2, axis=-1)
return x / tf.expand_dims(l2, axis=-1)
# Taking the sum of upper triangular of XX^T and divided by ensemble size.
def pairwise_cosine_distance(x):
"""Compute the pairwise distance in a matrix."""
normalized_x = _normalize(x)
return (tf.reduce_sum(
tf.matmul(normalized_x, normalized_x, transpose_b=True)) -
FLAGS.ensemble_size) / (2.0 * FLAGS.ensemble_size)
with tf.GradientTape() as tape:
logits = model(images, training=True)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
if FLAGS.mixup_alpha > 0 or FLAGS.label_smoothing > 0 or FLAGS.cutmix:
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.categorical_crossentropy(
labels, logits, from_logits=True))
else:
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(
labels, logits, from_logits=True))
l2_loss = sum(model.losses)
fast_weights = [
var for var in model.trainable_variables
if not _is_batch_norm(var) and (
'alpha' in var.name or 'gamma' in var.name)
]
pairwise_distance_loss = tf.add_n(
[pairwise_cosine_distance(var) for var in fast_weights])
diversity_start_iter = steps_per_epoch * FLAGS.diversity_start_epoch
diversity_iterations = optimizer.iterations - diversity_start_iter
if diversity_iterations > 0:
diversity_coeff = diversity_schedule(diversity_iterations)
diversity_loss = diversity_coeff * pairwise_distance_loss
loss = negative_log_likelihood + l2_loss + diversity_loss
else:
loss = negative_log_likelihood + l2_loss
# Scale the loss given the TPUStrategy will reduce sum all gradients.
scaled_loss = loss / strategy.num_replicas_in_sync
grads = tape.gradient(scaled_loss, model.trainable_variables)
# Separate learning rate implementation.
if FLAGS.fast_weight_lr_multiplier != 1.0:
grads_and_vars = []
for grad, var in zip(grads, model.trainable_variables):
# Apply different learning rate on the fast weight approximate
# posterior/prior parameters. This is excludes BN and slow weights,
# but pay caution to the naming scheme.
if (not _is_batch_norm(var) and 'kernel' not in var.name):
grads_and_vars.append(
(grad * FLAGS.fast_weight_lr_multiplier, var))
else:
grads_and_vars.append((grad, var))
optimizer.apply_gradients(grads_and_vars)
else:
optimizer.apply_gradients(zip(grads,
model.trainable_variables))
probs = tf.nn.softmax(logits)
if FLAGS.ensemble_size > 1:
per_probs = tf.reshape(
probs,
tf.concat([[FLAGS.ensemble_size, -1], probs.shape[1:]], 0))
diversity_results = um.average_pairwise_diversity(
per_probs, FLAGS.ensemble_size)
for k, v in diversity_results.items():
training_diversity['train/' + k].update_state(v)
if FLAGS.mixup_alpha > 0 or FLAGS.label_smoothing > 0 or FLAGS.cutmix:
labels = tf.argmax(labels, axis=-1)
metrics['train/ece'].update_state(labels, probs)
metrics['train/similarity'].update_state(pairwise_distance_loss)
metrics['train/l2'].update_state(l2_loss)
metrics['train/loss'].update_state(loss)
metrics['train/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['train/accuracy'].update_state(labels, logits)
if FLAGS.forget_mixup:
train_predictions = tf.argmax(probs, -1)
labels = tf.cast(labels, train_predictions.dtype)
# For each ensemble member, we accumulate the accuracy counts.
accuracy_counts = tf.cast(
tf.reshape((train_predictions == labels),
[FLAGS.ensemble_size, -1]), tf.float32)
return accuracy_counts, idx
if FLAGS.forget_mixup:
return strategy.run(step_fn, args=(next(iterator), ))
else:
strategy.run(step_fn, args=(next(iterator), ))
@tf.function
def test_step(iterator, dataset_name):
"""Evaluation StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
images = tf.tile(images, [FLAGS.ensemble_size, 1, 1, 1])
logits = model(images, training=False)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
probs = tf.nn.softmax(logits)
per_probs = tf.split(probs,
num_or_size_splits=FLAGS.ensemble_size,
axis=0)
for i in range(FLAGS.ensemble_size):
member_probs = per_probs[i]
if dataset_name == 'clean':
member_loss = tf.keras.losses.sparse_categorical_crossentropy(
labels, member_probs)
metrics['test/nll_member_{}'.format(i)].update_state(
member_loss)
metrics['test/accuracy_member_{}'.format(i)].update_state(
labels, member_probs)
metrics['test/member_accuracy_mean'].update_state(
labels, member_probs)
metrics['test/ece_member_{}'.format(i)].update_state(
labels, member_probs)
metrics['test/member_ece_mean'].update_state(
labels, member_probs)
elif dataset_name != 'validation':
corrupt_metrics['test/member_acc_mean_{}'.format(
dataset_name)].update_state(labels, member_probs)
corrupt_metrics['test/member_ece_mean_{}'.format(
dataset_name)].update_state(labels, member_probs)
if FLAGS.ensemble_size > 1:
per_probs_tensor = tf.reshape(
probs,
tf.concat([[FLAGS.ensemble_size, -1], probs.shape[1:]], 0))
diversity_results = um.average_pairwise_diversity(
per_probs_tensor, FLAGS.ensemble_size)
if dataset_name == 'clean':
for k, v in diversity_results.items():
test_diversity['test/' + k].update_state(v)
elif dataset_name != 'validation':
for k, v in diversity_results.items():
corrupt_diversity['corrupt_diversity/{}_{}'.format(
k, dataset_name)].update_state(v)
probs = tf.reduce_mean(per_probs, axis=0)
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(labels, probs))
if dataset_name == 'clean':
metrics['test/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['test/accuracy'].update_state(labels, probs)
metrics['test/ece'].update_state(labels, probs)
elif dataset_name != 'validation':
corrupt_metrics['test/nll_{}'.format(
dataset_name)].update_state(negative_log_likelihood)
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)].update_state(labels, probs)
corrupt_metrics['test/ece_{}'.format(
dataset_name)].update_state(labels, probs)
if dataset_name == 'validation':
return per_probs_tensor, labels
if dataset_name == 'validation':
return strategy.run(step_fn, args=(next(iterator), ))
else:
strategy.run(step_fn, args=(next(iterator), ))
train_iterator = iter(train_dataset)
start_time = time.time()
forget_counts_history = []
for epoch in range(initial_epoch, FLAGS.train_epochs):
logging.info('Starting to run epoch: %s', epoch)
acc_counts_list = []
idx_list = []
for step in range(steps_per_epoch):
if FLAGS.forget_mixup:
temp_accuracy_counts, temp_idx = train_step(train_iterator)
acc_counts_list.append(temp_accuracy_counts)
idx_list.append(temp_idx)
else:
train_step(train_iterator)
current_step = epoch * steps_per_epoch + (step + 1)
max_steps = steps_per_epoch * FLAGS.train_epochs
time_elapsed = time.time() - start_time
steps_per_sec = float(current_step) / time_elapsed
eta_seconds = (max_steps - current_step) / steps_per_sec
message = ('{:.1%} completion: epoch {:d}/{:d}. {:.1f} steps/s. '
'ETA: {:.0f} min. Time elapsed: {:.0f} min'.format(
current_step / max_steps, epoch + 1,
FLAGS.train_epochs, steps_per_sec, eta_seconds / 60,
time_elapsed / 60))
if step % 20 == 0:
logging.info(message)
# Only one of the forget_mixup and adaptive_mixup can be true.
if FLAGS.forget_mixup:
current_acc = [
tf.concat(list(acc_counts_list[i].values), axis=1)
for i in range(len(acc_counts_list))
]
total_idx = [
tf.concat(list(idx_list[i].values), axis=0)
for i in range(len(idx_list))
]
current_acc = tf.cast(tf.concat(current_acc, axis=1), tf.int32)
total_idx = tf.concat(total_idx, axis=0)
current_forget_path = os.path.join(FLAGS.output_dir,
'forget_counts.npy')
last_acc_path = os.path.join(FLAGS.output_dir, 'last_acc.npy')
if epoch == 0:
forget_counts = tf.zeros(
[FLAGS.ensemble_size, num_train_examples], dtype=tf.int32)
last_acc = tf.zeros([FLAGS.ensemble_size, num_train_examples],
dtype=tf.int32)
else:
if 'last_acc' not in locals():
with tf.io.gfile.GFile(last_acc_path, 'rb') as f:
last_acc = np.load(f)
last_acc = tf.cast(tf.convert_to_tensor(last_acc),
tf.int32)
if 'forget_counts' not in locals():
with tf.io.gfile.GFile(current_forget_path, 'rb') as f:
forget_counts = np.load(f)
forget_counts = tf.cast(
tf.convert_to_tensor(forget_counts), tf.int32)
selected_last_acc = tf.gather(last_acc, total_idx, axis=1)
forget_this_epoch = tf.cast(current_acc < selected_last_acc,
tf.int32)
forget_this_epoch = tf.transpose(forget_this_epoch)
target_shape = tf.constant(
[num_train_examples, FLAGS.ensemble_size])
current_forget_counts = tf.scatter_nd(
tf.reshape(total_idx, [-1, 1]), forget_this_epoch,
target_shape)
current_forget_counts = tf.transpose(current_forget_counts)
acc_this_epoch = tf.transpose(current_acc)
last_acc = tf.scatter_nd(tf.reshape(total_idx, [-1, 1]),
acc_this_epoch, target_shape)
# This is lower bound of true acc.
last_acc = tf.transpose(last_acc)
# TODO(ywenxu): We count the dropped examples as forget. Fix this later.
forget_counts += current_forget_counts
forget_counts_history.append(forget_counts)
logging.info('forgetting counts')
logging.info(tf.stack(forget_counts_history, 0))
with tf.io.gfile.GFile(
os.path.join(FLAGS.output_dir,
'forget_counts_history.npy'), 'wb') as f:
np.save(f, tf.stack(forget_counts_history, 0).numpy())
with tf.io.gfile.GFile(current_forget_path, 'wb') as f:
np.save(f, forget_counts.numpy())
with tf.io.gfile.GFile(last_acc_path, 'wb') as f:
np.save(f, last_acc.numpy())
aug_params['forget_counts_dir'] = current_forget_path
train_input_fn = data_utils.load_input_fn(
split=tfds.Split.TRAIN,
name=FLAGS.dataset,
batch_size=FLAGS.num_cores *
(FLAGS.per_core_batch_size // FLAGS.ensemble_size),
use_bfloat16=FLAGS.use_bfloat16,
validation_set=FLAGS.validation,
aug_params=aug_params)
train_dataset = strategy.experimental_distribute_dataset(
train_input_fn())
train_iterator = iter(train_dataset)
if FLAGS.adaptive_mixup:
val_iterator = iter(val_dataset)
logging.info('Testing on validation dataset')
predictions_list = []
labels_list = []
for step in range(steps_per_val):
temp_predictions, temp_labels = test_step(
val_iterator, 'validation')
predictions_list.append(temp_predictions)
labels_list.append(temp_labels)
predictions = [
tf.concat(list(predictions_list[i].values), axis=1)
for i in range(len(predictions_list))
]
labels = [
tf.concat(list(labels_list[i].values), axis=0)
for i in range(len(labels_list))
]
predictions = tf.concat(predictions, axis=1)
labels = tf.cast(tf.concat(labels, axis=0), tf.int64)
def compute_acc_conf(preds, label, focus_class):
class_preds = tf.boolean_mask(preds,
label == focus_class,
axis=1)
class_pred_labels = tf.argmax(class_preds, axis=-1)
confidence = tf.reduce_mean(
tf.reduce_max(class_preds, axis=-1), -1)
accuracy = tf.reduce_mean(tf.cast(
class_pred_labels == focus_class, tf.float32),
axis=-1)
return accuracy - confidence
calibration_per_class = [
compute_acc_conf(predictions, labels, i)
for i in range(num_classes)
]
calibration_per_class = tf.stack(calibration_per_class, axis=1)
logging.info('calibration per class')
logging.info(calibration_per_class)
mixup_coeff = tf.where(calibration_per_class > 0, 1.0,
FLAGS.mixup_alpha)
mixup_coeff = tf.clip_by_value(mixup_coeff, 0, 1)
logging.info('mixup coeff')
logging.info(mixup_coeff)
aug_params['mixup_coeff'] = mixup_coeff
train_input_fn = data_utils.load_input_fn(
split=tfds.Split.TRAIN,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size // FLAGS.ensemble_size,
use_bfloat16=FLAGS.use_bfloat16,
validation_set=True,
aug_params=aug_params)
train_dataset = strategy.experimental_distribute_datasets_from_function(
train_input_fn)
train_iterator = iter(train_dataset)
datasets_to_evaluate = {'clean': test_datasets['clean']}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
datasets_to_evaluate = test_datasets
for dataset_name, test_dataset in datasets_to_evaluate.items():
test_iterator = iter(test_dataset)
logging.info('Testing on dataset %s', dataset_name)
for step in range(steps_per_eval):
if step % 20 == 0:
logging.info('Starting to run eval step %s of epoch: %s',
step, epoch)
test_step(test_iterator, dataset_name)
logging.info('Done with testing on %s', dataset_name)
corrupt_results = {}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
# This includes corrupt_diversity whose disagreement normalized by its
# corrupt mean error rate.
corrupt_results = utils.aggregate_corrupt_metrics(
corrupt_metrics,
corruption_types,
max_intensity,
corrupt_diversity=corrupt_diversity,
output_dir=FLAGS.output_dir)
logging.info('Train Loss: %.4f, Accuracy: %.2f%%',
metrics['train/loss'].result(),
metrics['train/accuracy'].result() * 100)
logging.info('Test NLL: %.4f, Accuracy: %.2f%%',
metrics['test/negative_log_likelihood'].result(),
metrics['test/accuracy'].result() * 100)
for i in range(FLAGS.ensemble_size):
logging.info(
'Member %d Test Loss: %.4f, Accuracy: %.2f%%', i,
metrics['test/nll_member_{}'.format(i)].result(),
metrics['test/accuracy_member_{}'.format(i)].result() * 100)
total_metrics = metrics.copy()
total_metrics.update(training_diversity)
total_metrics.update(test_diversity)
total_results = {
name: metric.result()
for name, metric in total_metrics.items()
}
total_results.update(corrupt_results)
# Normalize all disagreement metrics (training, testing) by test accuracy.
# Disagreement on corrupt dataset is normalized by their own error rate.
test_acc = total_metrics['test/accuracy'].result()
for name, metric in total_metrics.items():
if 'disagreement' in name:
total_results[name] = metric.result() / test_acc
with summary_writer.as_default():
for name, result in total_results.items():
tf.summary.scalar(name, result, step=epoch + 1)
if FLAGS.forget_mixup:
tf.summary.histogram('forget_counts',
forget_counts,
step=epoch + 1)
for metric in total_metrics.values():
metric.reset_states()
if (FLAGS.checkpoint_interval > 0
and (epoch + 1) % FLAGS.checkpoint_interval == 0):
checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved checkpoint to %s', checkpoint_name)
# Need to store the last but one checkpoint in adaptive mixup setup.
if FLAGS.adaptive_mixup and epoch == (FLAGS.train_epochs - 2):
checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'last_but_one_checkpoint'))
logging.info('Saved checkpoint to %s', checkpoint_name)
final_checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved last checkpoint to %s', final_checkpoint_name)
final_save_name = os.path.join(FLAGS.output_dir, 'model')
model.save(final_save_name)
logging.info('Saved model to %s', final_save_name)
def get_dataset(data_dir, config, dataset_name=None):
"""The training dataset for the code model for fault localization.
Args:
data_dir: The data directory to use with tfds.load.
config: The config for the model.
dataset_name: If set, use this dataset name in place of the one from the
config.
Returns:
train_dataset: The tf.data.Dataset with batched examples.
info: The DatasetInfo object containing the feature connectors and other
info about the dataset.
"""
dataset_name = dataset_name or config.dataset.name
split = get_split(config)
version = (None if config.dataset.version == 'default' else
config.dataset.version)
# If in interact mode, use an interactive dataset.
if config.runner.mode == 'interact':
dbuilder = tfds.builder(dataset_name,
data_dir=data_dir,
version=version)
unused_split_generators = dbuilder._split_generators(dl_manager=None) # pylint: disable=protected-access
info = dbuilder.info
info._builder.set_representation(config.dataset.representation) # pylint: disable=protected-access
assert config.dataset.batch_size == 1
dataset = make_interactive_dataset(info, config)
if config.dataset.batch:
dataset = apply_batching(dataset, info, config)
set_task = cannot_set_task
return DatasetInfo(dataset=dataset, info=info, set_task=set_task)
# Load the dataset.
if config.dataset.in_memory:
dbuilder = tfds.builder(dataset_name,
data_dir=data_dir,
version=version)
unused_split_generators = dbuilder._split_generators(dl_manager=None) # pylint: disable=protected-access
dataset, set_task = dbuilder.as_in_memory_dataset(split='all')
info = dbuilder.info
else:
name = dataset_name
if version is not None:
name = f'{name}:{version}'
dataset, info = tfds.load(
name=name,
split=split,
data_dir=data_dir,
# batch_size=config.dataset.batch_size,
with_info=True)
set_task = cannot_set_task
info._builder.set_representation(config.dataset.representation) # pylint: disable=protected-access
verify_reasonable_dataset(dataset_name, info, config)
dataset = dataset.repeat()
dataset = apply_filtering(dataset, info, config)
if config.dataset.batch:
dataset = apply_batching(dataset, info, config)
return DatasetInfo(
dataset=dataset,
info=info,
set_task=set_task,
)
import tensorflow as tf
import tensorflow_datasets as tfds
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd
import seaborn as sns
mnist_bldr = tfds.builder('mnist')
mnist_bldr.download_and_prepare()
datasets = mnist_bldr.as_dataset(shuffle_files=False)
mnist_train_orig = datasets['train']
mnist_test_orig = datasets['test']
BUFFER_SIZE = 10000
BATCH_SIZE = 64
NUM_EPOCHS = 20
mnist_train = mnist_train_orig.map(lambda item: (tf.cast(
item['image'], tf.float32) / 255.0, tf.cast(item['label'], tf.int32)))
mnist_test = mnist_train_orig.map(lambda item: (tf.cast(
item['image'], tf.float32) / 255.0, tf.cast(item['label'], tf.int32)))
tf.random.set_seed(1)
mnist_train = mnist_train.shuffle(buffer_size=BUFFER_SIZE,
reshuffle_each_iteration=False)
mnist_valid = mnist_train.take(10000).batch(BATCH_SIZE)
mnist_train = mnist_train.skip(10000).batch(BATCH_SIZE)
model = tf.keras.Sequential()
model.add(
def train(pooling = 'global',
backbonetype='mobilenetv2',
output_stride = 8,
residual_shortcut = False,
height_image = 448,
width_image = 448,
channels = 3,
crop_enable = False,
height_crop = 448,
width_crop = 448,
debug_en = False,
dataset_name = 'freiburg_forest',
class_imbalance_correction = False,
data_augmentation = True,
multigpu_enable = True,
batch_size = 32,
epochs = 300,
initial_epoch = -1,
continue_traning = False,
fine_tune_last = False,
base_learning_rate = 0.007,
learning_power = 0.98,
decay_steps = 1,
learning_rate_decay_step = 300,
decay = 5**(-4),
validation_enable=False
):
## Check the number of labels
if dataset_name == 'cityscape':
classes = cityscape.classes
elif dataset_name == 'citysmall':
classes = citysmall.classes
elif dataset_name == 'off_road_small':
classes = off_road_small.classes
elif dataset_name == 'freiburg_forest':
classes = freiburg_forest.classes
n_classes = len(classes)
ignore_label = classes[-1]['name']=='ignore'
ignore_label = False
#n_classes = 12
if crop_enable:
assert(height_crop == width_crop,
"When crop is enable height_crop should be equals to width_crop")
assert(height_crop <= height_image,
"When crop is enable height_crop should be less than or equals to height_image")
assert(width_crop <= width_image,
"When crop is enable height_crop should be less than or equals to width_image")
else:
height_crop = height_image
width_crop = width_image
# Construct a tf.data.Dataset
info = tfds.builder(dataset_name).info
print(info)
# if validation_enable : #7%
# ds_train, ds_val, ds_test = tfds.load(name=dataset_name, split=['train[:-10%]', 'train[-10%:]', 'test'], as_supervised=True)
# else:
# ds_train, ds_test = tfds.load(name=dataset_name, split=["train", 'test'], as_supervised=True)
train, ds_val, ds_test = tfds.load(name=dataset_name,
split=[tfds.Split.TRAIN,
tfds.Split.VALIDATION,
tfds.Split.TEST],
as_supervised=True)
height_ds = info.features['image'].shape[-3]
width_ds = info.features['image'].shape[-2]
# Add normalize
def _normalize_img(image, label):
image = tf.cast(image, tf.float32)/127.5 - 1
if crop_enable:
y1 = tf.random.uniform(shape=[], minval=0., maxval=(height_image-height_crop)/height_image, dtype=tf.float32)
x1 = tf.random.uniform(shape=[], minval=0., maxval=(width_image-width_crop)/width_image, dtype=tf.float32)
y2 = y1 + (height_crop/height_image)
x2 = x1 + (width_crop/width_image)
boxes = [[y1, x1, y2, x2]]
image = tf.image.crop_and_resize([image], boxes, box_indices=[0], crop_size=(height_crop, width_crop), method=tf.image.ResizeMethod.BILINEAR)[0]
label = tf.cast(tf.image.crop_and_resize([label], boxes, box_indices=[0], crop_size=(height_crop, width_crop), method=tf.image.ResizeMethod.NEAREST_NEIGHBOR)[0],dtype=tf.uint8)
else:
image = tf.image.resize(image, (height_image,width_image), method=tf.image.ResizeMethod.BILINEAR)
label = tf.image.resize(label, (height_image,width_image), method=tf.image.ResizeMethod.NEAREST_NEIGHBOR)
return (image, label)
# ds_train = ds_train.map(_normalize_img, num_parallel_calls=tf.data.experimental.AUTOTUNE)
# if validation_enable :
# ds_val = ds_val.map(_normalize_img, num_parallel_calls=tf.data.experimental.AUTOTUNE)
if validation_enable :
ds_train = train
train_size = info.splits['train'].num_examples
else:
ds_train = train.concatenate(ds_val)
train_size = info.splits['train'].num_examples + info.splits['validation'].num_examples
# ds_train = ds_train.take(100)
ds_train = ds_train.map(_normalize_img, num_parallel_calls=tf.data.experimental.AUTOTUNE)
ds_val = ds_val.map(_normalize_img, num_parallel_calls=tf.data.experimental.AUTOTUNE)
########################################################debug
# ds_test = ds_test.map(_normalize_img, num_parallel_calls=tf.data.experimental.AUTOTUNE)
# ds_test = ds_test.shuffle(124).batch(batch_size).prefetch(10)
########################################################debug
if data_augmentation:
# Add augmentations
augmentations = [aug.flip, aug.color, aug.zoom, aug.rotate]
for f in augmentations:
ds_train = ds_train.map(lambda x, y: tf.cond(tf.random.uniform([], 0, 1) > 0.75, lambda: f(x, y), lambda: (x, y)),
num_parallel_calls=tf.data.experimental.AUTOTUNE)
ds_train = ds_train.map(lambda x, y: (tf.clip_by_value(x, -1, 1), y), num_parallel_calls=tf.data.experimental.AUTOTUNE)
if debug_en:
aug.plot_images(ds_train, n_images=8, samples_per_image=10, classes = classes)
# Build your input pipeline
ds_train = ds_train.repeat().shuffle(124).batch(batch_size).prefetch(10)
ds_val = ds_val.shuffle(124).batch(batch_size).prefetch(10)
# ds_train = ds_train.shuffle(124).batch(batch_size).prefetch(10)
# if validation_enable :
# ds_val = ds_val.shuffle(124).batch(batch_size).prefetch(10)
# else:
# ds_val = None
# validation_steps=int(round(info.splits['test'].num_examples/batch_size))
steps_per_epoch=int(round(train_size/batch_size))
step_size = steps_per_epoch
class MIoU(MeanIoU):
def __init__(self, num_classes, name=None, dtype=None):
super(MIoU, self).__init__(num_classes=num_classes, name=name, dtype=dtype)
def update_state(self, y_true, y_pred, sample_weight=None):
return super(MIoU, self).update_state(
y_true=y_true,
y_pred=tf.math.argmax(input=y_pred, axis=-1, output_type=tf.dtypes.int64),
sample_weight=sample_weight)
# class_imbalance_correction
fold_name = (backbonetype+'s'+str(output_stride)+'_pooling_' + pooling
+('_residual_shortcut' if residual_shortcut else '')+'_ep'+str(epochs)
+('_crop_'+str(height_crop)+'x'+str(width_crop) if crop_enable else '_')
+('from' if crop_enable else '')+str(height_image)+'x'+str(width_image)
+'_'+('wda_' if data_augmentation else 'nda_')
+('wcic_' if class_imbalance_correction else 'ncic_')
+('wft_' if fine_tune_last else 'nft_')+dataset_name+'_b'
+str(batch_size)+('_n' if multigpu_enable else '_1')+'gpu')
# multigpu_enable = False
if multigpu_enable:
strategy = tf.distribute.MirroredStrategy()
with strategy.scope():
cmsnet = CMSNet(dl_input_shape=(None, height_crop, width_crop, channels),
num_classes=n_classes, output_stride=output_stride,
pooling=pooling, residual_shortcut=residual_shortcut,
backbonetype=backbonetype)
cmsnet.summary()
#cmsnet.mySummary()
optimizer = SGD(momentum=0.9, nesterov=True)
#optimizer = RMSprop(lr=0.001, rho=0.9, epsilon=1e-6)
#optimizer = Adadelta(lr=0.008, rho=0.95, epsilon=None, decay=0.0)
# optimizer = Adamax(lr=0.002, beta_1=0.9, beta_2=0.999, epsilon=None, decay=0.0)
#optimizer = Nadam(lr=0.002, beta_1=0.9, beta_2=0.999, epsilon=None, schedule_decay=0.004)
miou = MIoU(num_classes=n_classes)
cmsnet.compile(loss='sparse_categorical_crossentropy', optimizer=optimizer,
metrics=['accuracy', miou]
)
else:
cmsnet = CMSNet(dl_input_shape=(None, height_crop, width_crop, channels),
num_classes=n_classes, output_stride=output_stride, pooling=pooling,
residual_shortcut=residual_shortcut, backbonetype=backbonetype)
cmsnet.summary()
optimizer = SGD(momentum=0.9, nesterov=True)
#optimizer = RMSprop(lr=0.001, rho=0.9, epsilon=1e-6)
#optimizer = Adadelta(lr=0.008, rho=0.95, epsilon=None, decay=0.0)
# optimizer = Adamax(lr=0.002, beta_1=0.9, beta_2=0.999, epsilon=None, decay=0.0)
#optimizer = Nadam(lr=0.002, beta_1=0.9, beta_2=0.999, epsilon=None, schedule_decay=0.004)
miou = MIoU(num_classes=n_classes)
cmsnet.compile(loss='sparse_categorical_crossentropy', optimizer=optimizer,
metrics=['accuracy', miou])
#fold_name = 's16_wda_ncic_nft_off_road_small_b8_ngpu_ep300_483x769_pooling_aspp_20190815-151551'
# Define the Keras TensorBoard callback.
if continue_traning:
logdir=build_path+"logs/fit/" + fold_name #Continue
if initial_epoch == -1: #get last checkpoint epoch
names = glob.glob(logdir+'*/weights.*')
names.sort()
initial_epoch = int(names[-1].split('.')[-4].split('-')[0])
#weights_path = glob.glob(logdir+'*/weights.*'+str(initial_epoch)+'-*')[0]
weights_path = glob.glob(logdir+'*/weights.last*')[0]
logdir = weights_path[:weights_path.find('/weights.')]
print('Continuing train from '+ weights_path)
if multigpu_enable:
with strategy.scope():
cmsnet.load_weights(weights_path)
else:
cmsnet.load_weights(weights_path)
else:
logdir=build_path+"logs/fit/" + fold_name+'_'+datetime.now().strftime("%Y%m%d-%H%M%S")
initial_epoch = 0
# if validation_enable : #7%
# ckp = ModelCheckpoint(logdir+"/weights.{epoch:03d}-{val_loss:.2f}-{val_m_io_u:.2f}.hdf5",
# monitor='val_m_io_u', mode='max', verbose=0, save_best_only=True,
# save_weights_only=True, period=1)
# else:
# ckp = ModelCheckpoint(logdir+"/weights.{epoch:03d}-{loss:.2f}-{m_io_u:.2f}.hdf5",
# monitor='val_m_io_u', mode='max', verbose=0, save_best_only=True,
# save_weights_only=True, period=1)
# ckp = ModelCheckpoint(logdir+"/weights.{epoch:03d}.hdf5",
# mode='max', verbose=0, save_best_only=True,
# save_weights_only=True, period=1)
ckp = ModelCheckpoint(logdir+"/weights.{epoch:03d}-{val_loss:.2f}-{val_m_io_u:.2f}.hdf5",
monitor='val_m_io_u', mode='max', verbose=0, save_best_only=True,
save_weights_only=True, period=1)
ckp_last = ModelCheckpoint(logdir+"/weights.last.hdf5", verbose=0, save_best_only=False,
save_weights_only=True, period=1)
tensorboard_callback = LRTensorBoard(log_dir=logdir, histogram_freq=0,
write_graph=True, write_images=True,
update_freq='epoch', profile_batch=2,
embeddings_freq=0)
#if aplay balance
# from sklearn.utils import class_weight
# class_weight = class_weight.compute_class_weight('balanced'
# ,np.unique(Y_train)
# ,Y_train)
# class_weight = {cls:1 for cls in range(n_classes)}
# #ignore the last label
# if ignore_label:
# class_weight[n_classes-1] = 0
if class_imbalance_correction:
class_weight = np.ones(n_classes) #TODO: insert inbalance equalizer
elif ignore_label:
class_weight = np.ones(n_classes)
else:
class_weight = None
#ignore the last label
if ignore_label:
class_weight[-1] = 0
class_weight=None
if fine_tune_last:
base_learning_rate = 0.0001
cmsnet.setFineTuning(lavel='fromSPPool')
# learning = lambda epoch: polynomial_decay(epoch, initial_lrate = base_learning_rate,
# learning_rate_decay_step=learning_rate_decay_step, learning_power=learning_power,
# end_learning_rate=0.0001, cycle=False)
learning = lambda epoch: exponential_decay(learning_rate=base_learning_rate, global_step=epoch, decay_steps=decay_steps, decay_rate=learning_power)
lrate = LearningRateScheduler(learning)
hist1 = cmsnet.fit(ds_train, validation_data=ds_val, epochs=epochs,
callbacks=[tensorboard_callback, lrate, ckp],
initial_epoch=initial_epoch, class_weight=class_weight)
else:
cmsnet.setFineTuning(lavel='fromAll')
# learning = lambda epoch: polynomial_decay(epoch, initial_lrate = base_learning_rate,
# learning_rate_decay_step=learning_rate_decay_step, learning_power=learning_power,
# end_learning_rate=0, cycle=False)
learning = lambda epoch: exponential_decay(learning_rate=base_learning_rate, global_step=epoch, decay_steps=decay_steps, decay_rate=learning_power)
lrate = LearningRateScheduler(learning)
cmsnet.fit(ds_train, validation_data = ds_val,
epochs = round(epochs*steps_per_epoch/step_size),
steps_per_epoch = step_size,
callbacks = [tensorboard_callback, lrate, ckp, ckp_last],
initial_epoch = initial_epoch,
class_weight = class_weight,
use_multiprocessing = True)
########################################################debug
# result = cmsnet.evaluate(ds_train, use_multiprocessing=True)
# import json
# with open(build_path+'reslut0.txt', 'w') as file:
# file.write(json.dumps(result))
# classes_ids = [1, 2, 3, 4, 0]
# from evaluation.trained import print_result2
# print(result['name'])
# print("Params: "+str(result['count_params']))
# print_result2(result['classes'], np.array(result['confusion_matrix']), classes_ids)
########################################################debug
# ########################################################debug
# result = cmsnet.evaluate(ds_test, use_multiprocessing=True)
# import json
# with open(build_path+'reslut0.txt', 'w') as file:
# file.write(json.dumps(result))
# classes_ids = [1, 2, 3, 4, 0]
# from evaluation.trained import print_result2
# print(result['name'])
# print("Params: "+str(result['count_params']))
# print_result2(result['classes'], np.array(result['confusion_matrix']), classes_ids)
# ########################################################debug
cmsnet.save_weights(logdir+"/weights.300-n.nn-n.nn.hdf5")
import time
import numpy as np
# import matplotlib as mpl
# import matplotlib.pyplot as plt
from pprint import pprint
import tensorflow as tf
import tensorflow_datasets as tfds
print(tf.__version__)
output_dir = "nmt"
en_vocab_file = os.path.join(output_dir, "en_vocab")
zh_vocab_file = os.path.join(output_dir, "zh_vocab")
checkpoint_path = os.path.join(output_dir, "checkpoints")
log_dir = os.path.join(output_dir, 'logs')
download_dir = "tensorflow-datasets/downloads"
if not os.path.exists(output_dir):
os.makedirs(output_dir)
tmp_builder = tfds.builder("wmt19_translate/zh-en")
pprint(tmp_builder.subsets)
config = tfds.translate.wmt.WmtConfig(
version=tfds.core.Version('0.0.3',
experiments={tfds.core.Experiment.S3: False}),
language_pair=("zh", "en"),
subsets={tfds.Split.TRAIN: ["newscommentary_v14"]})
builder = tfds.builder("wmt_translate", config=config)
builder.download_and_prepare(download_dir=download_dir)
def main(argv):
del argv # unused arg
tf.enable_v2_behavior()
tf.io.gfile.makedirs(FLAGS.output_dir)
logging.info('Saving checkpoints at %s', FLAGS.output_dir)
tf.random.set_seed(FLAGS.seed)
if FLAGS.use_gpu:
logging.info('Use GPU')
strategy = tf.distribute.MirroredStrategy()
else:
logging.info('Use TPU at %s',
FLAGS.tpu if FLAGS.tpu is not None else 'local')
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=FLAGS.tpu)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.experimental.TPUStrategy(resolver)
train_input_fn = utils.load_input_fn(split=tfds.Split.TRAIN,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size,
use_bfloat16=FLAGS.use_bfloat16)
clean_test_input_fn = utils.load_input_fn(
split=tfds.Split.TEST,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size,
use_bfloat16=FLAGS.use_bfloat16)
train_dataset = strategy.experimental_distribute_datasets_from_function(
train_input_fn)
test_datasets = {
'clean':
strategy.experimental_distribute_datasets_from_function(
clean_test_input_fn),
}
if FLAGS.corruptions_interval > 0:
if FLAGS.dataset == 'cifar10':
load_c_input_fn = utils.load_cifar10_c_input_fn
else:
load_c_input_fn = functools.partial(utils.load_cifar100_c_input_fn,
path=FLAGS.cifar100_c_path)
corruption_types, max_intensity = utils.load_corrupted_test_info(
FLAGS.dataset)
for corruption in corruption_types:
for intensity in range(1, max_intensity + 1):
input_fn = load_c_input_fn(
corruption_name=corruption,
corruption_intensity=intensity,
batch_size=FLAGS.per_core_batch_size,
use_bfloat16=FLAGS.use_bfloat16)
test_datasets['{0}_{1}'.format(corruption, intensity)] = (
strategy.experimental_distribute_datasets_from_function(
input_fn))
ds_info = tfds.builder(FLAGS.dataset).info
batch_size = FLAGS.per_core_batch_size * FLAGS.num_cores
train_dataset_size = ds_info.splits['train'].num_examples
steps_per_epoch = train_dataset_size // batch_size
steps_per_eval = ds_info.splits['test'].num_examples // batch_size
num_classes = ds_info.features['label'].num_classes
if FLAGS.use_bfloat16:
policy = tf.keras.mixed_precision.experimental.Policy('mixed_bfloat16')
tf.keras.mixed_precision.experimental.set_policy(policy)
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.output_dir, 'summaries'))
with strategy.scope():
logging.info('Building ResNet model')
model = wide_resnet(input_shape=ds_info.features['image'].shape,
depth=28,
width_multiplier=10,
num_classes=num_classes,
prior_stddev=FLAGS.prior_stddev,
dataset_size=train_dataset_size,
stddev_init=FLAGS.stddev_init)
logging.info('Model input shape: %s', model.input_shape)
logging.info('Model output shape: %s', model.output_shape)
logging.info('Model number of weights: %s', model.count_params())
# Linearly scale learning rate and the decay epochs by vanilla settings.
base_lr = FLAGS.base_learning_rate * batch_size / 128
lr_decay_epochs = [(start_epoch * FLAGS.train_epochs) // 200
for start_epoch in FLAGS.lr_decay_epochs]
lr_schedule = utils.LearningRateSchedule(
steps_per_epoch,
base_lr,
decay_ratio=FLAGS.lr_decay_ratio,
decay_epochs=lr_decay_epochs,
warmup_epochs=FLAGS.lr_warmup_epochs)
optimizer = tf.keras.optimizers.SGD(lr_schedule,
momentum=0.9,
nesterov=True)
metrics = {
'train/negative_log_likelihood':
tf.keras.metrics.Mean(),
'train/accuracy':
tf.keras.metrics.SparseCategoricalAccuracy(),
'train/loss':
tf.keras.metrics.Mean(),
'train/ece':
ed.metrics.ExpectedCalibrationError(num_classes=num_classes,
num_bins=FLAGS.num_bins),
'train/kl':
tf.keras.metrics.Mean(),
'train/kl_scale':
tf.keras.metrics.Mean(),
'test/negative_log_likelihood':
tf.keras.metrics.Mean(),
'test/accuracy':
tf.keras.metrics.SparseCategoricalAccuracy(),
'test/ece':
ed.metrics.ExpectedCalibrationError(num_classes=num_classes,
num_bins=FLAGS.num_bins),
}
if FLAGS.corruptions_interval > 0:
corrupt_metrics = {}
for intensity in range(1, max_intensity + 1):
for corruption in corruption_types:
dataset_name = '{0}_{1}'.format(corruption, intensity)
corrupt_metrics['test/nll_{}'.format(dataset_name)] = (
tf.keras.metrics.Mean())
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
corrupt_metrics['test/ece_{}'.format(dataset_name)] = (
ed.metrics.ExpectedCalibrationError(
num_classes=num_classes, num_bins=FLAGS.num_bins))
global_step = tf.Variable(
0,
trainable=False,
name='global_step',
dtype=tf.int64,
aggregation=tf.VariableAggregation.ONLY_FIRST_REPLICA)
checkpoint = tf.train.Checkpoint(model=model,
optimizer=optimizer,
global_step=global_step)
latest_checkpoint = tf.train.latest_checkpoint(FLAGS.output_dir)
initial_epoch = 0
if latest_checkpoint:
# checkpoint.restore must be within a strategy.scope() so that optimizer
# slot variables are mirrored.
checkpoint.restore(latest_checkpoint)
logging.info('Loaded checkpoint %s', latest_checkpoint)
initial_epoch = optimizer.iterations.numpy() // steps_per_epoch
@tf.function
def train_step(iterator):
"""Training StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
with tf.GradientTape() as tape:
logits = model(images, training=True)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(
labels, logits, from_logits=True))
filtered_variables = []
for var in model.trainable_variables:
# Apply l2 on the BN parameters and bias terms. This
# excludes only fast weight approximate posterior/prior parameters,
# but pay caution to their naming scheme.
if 'batch_norm' in var.name or 'bias' in var.name:
filtered_variables.append(tf.reshape(var, (-1, )))
l2_loss = FLAGS.l2 * 2 * tf.nn.l2_loss(
tf.concat(filtered_variables, axis=0))
kl = sum(model.losses)
kl_scale = tf.cast(global_step + 1, tf.float32)
kl_scale /= steps_per_epoch * FLAGS.kl_annealing_epochs
kl_scale = tf.minimum(1., kl_scale)
kl_loss = kl_scale * kl
# Scale the loss given the TPUStrategy will reduce sum all gradients.
loss = negative_log_likelihood + l2_loss + kl_loss
scaled_loss = loss / strategy.num_replicas_in_sync
grads = tape.gradient(scaled_loss, model.trainable_variables)
optimizer.apply_gradients(zip(grads, model.trainable_variables))
probs = tf.nn.softmax(logits)
metrics['train/ece'].update_state(labels, probs)
metrics['train/loss'].update_state(loss)
metrics['train/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['train/kl'].update_state(kl)
metrics['train/kl_scale'].update_state(kl_scale)
metrics['train/accuracy'].update_state(labels, logits)
global_step.assign_add(1)
strategy.experimental_run_v2(step_fn, args=(next(iterator), ))
@tf.function
def test_step(iterator, dataset_name):
"""Evaluation StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
# TODO(trandustin): Use more eval samples only on corrupted predictions;
# it's expensive but a one-time compute if scheduled post-training.
if FLAGS.num_eval_samples > 1 and dataset_name != 'clean':
logits = tf.stack([
model(images, training=False)
for _ in range(FLAGS.num_eval_samples)
],
axis=0)
else:
logits = model(images, training=False)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
probs = tf.nn.softmax(logits)
if FLAGS.num_eval_samples > 1 and dataset_name != 'clean':
probs = tf.reduce_mean(probs, axis=0)
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(labels, probs))
if dataset_name == 'clean':
metrics['test/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['test/accuracy'].update_state(labels, probs)
metrics['test/ece'].update_state(labels, probs)
else:
corrupt_metrics['test/nll_{}'.format(
dataset_name)].update_state(negative_log_likelihood)
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)].update_state(labels, probs)
corrupt_metrics['test/ece_{}'.format(
dataset_name)].update_state(labels, probs)
strategy.experimental_run_v2(step_fn, args=(next(iterator), ))
train_iterator = iter(train_dataset)
start_time = time.time()
for epoch in range(initial_epoch, FLAGS.train_epochs):
logging.info('Starting to run epoch: %s', epoch)
for step in range(steps_per_epoch):
train_step(train_iterator)
current_step = epoch * steps_per_epoch + (step + 1)
max_steps = steps_per_epoch * FLAGS.train_epochs
time_elapsed = time.time() - start_time
steps_per_sec = float(current_step) / time_elapsed
eta_seconds = (max_steps - current_step) / steps_per_sec
message = ('{:.1%} completion: epoch {:d}/{:d}. {:.1f} steps/s. '
'ETA: {:.0f} min. Time elapsed: {:.0f} min'.format(
current_step / max_steps, epoch + 1,
FLAGS.train_epochs, steps_per_sec, eta_seconds / 60,
time_elapsed / 60))
if step % 20 == 0:
logging.info(message)
datasets_to_evaluate = {'clean': test_datasets['clean']}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
datasets_to_evaluate = test_datasets
for dataset_name, test_dataset in datasets_to_evaluate.items():
test_iterator = iter(test_dataset)
logging.info('Testing on dataset %s', dataset_name)
for step in range(steps_per_eval):
if step % 20 == 0:
logging.info('Starting to run eval step %s of epoch: %s',
step, epoch)
test_step(test_iterator, dataset_name)
logging.info('Done with testing on %s', dataset_name)
corrupt_results = {}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
corrupt_results = utils.aggregate_corrupt_metrics(
corrupt_metrics, corruption_types, max_intensity)
logging.info('Train Loss: %.4f, Accuracy: %.2f%%',
metrics['train/loss'].result(),
metrics['train/accuracy'].result() * 100)
logging.info('Test NLL: %.4f, Accuracy: %.2f%%',
metrics['test/negative_log_likelihood'].result(),
metrics['test/accuracy'].result() * 100)
total_results = {
name: metric.result()
for name, metric in metrics.items()
}
total_results.update(corrupt_results)
with summary_writer.as_default():
for name, result in total_results.items():
tf.summary.scalar(name, result, step=epoch + 1)
for metric in metrics.values():
metric.reset_states()
if (FLAGS.checkpoint_interval > 0
and (epoch + 1) % FLAGS.checkpoint_interval == 0):
checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved checkpoint to %s', checkpoint_name)
def main(_):
if FLAGS.module_import:
import_modules(FLAGS.module_import)
if FLAGS.debug_start:
pdb.set_trace()
if FLAGS.sleep_start:
time.sleep(60 * 60 * 3)
if FLAGS.disable_tqdm:
logging.info("Disabling tqdm.")
tfds.disable_progress_bar()
if FLAGS.checksums_dir:
tfds.download.add_checksums_dir(FLAGS.checksums_dir)
datasets_to_build = set(FLAGS.datasets and FLAGS.datasets.split(",")
or tfds.list_builders())
datasets_to_build -= set(FLAGS.exclude_datasets.split(","))
version = "experimental_latest" if FLAGS.experimental_latest_version else None
logging.info("Running download_and_prepare for datasets:\n%s",
"\n".join(datasets_to_build))
logging.info('Version: "%s"', version)
builders = {
name: tfds.builder(name, data_dir=FLAGS.data_dir, version=version)
for name in datasets_to_build
}
if FLAGS.builder_config_id is not None:
# Requesting a single config of a single dataset
if len(builders) > 1:
raise ValueError(
"--builder_config_id can only be used when building a single dataset"
)
builder = builders[list(builders.keys())[0]]
if not builder.BUILDER_CONFIGS:
raise ValueError(
"--builder_config_id can only be used with datasets with configs"
)
config = builder.BUILDER_CONFIGS[FLAGS.builder_config_id]
logging.info("Running download_and_prepare for config: %s",
config.name)
builder_for_config = tfds.builder(builder.name,
data_dir=FLAGS.data_dir,
config=config,
version=version)
download_and_prepare(builder_for_config)
else:
for name, builder in builders.items():
if builder.BUILDER_CONFIGS and "/" not in name:
# If builder has multiple configs, and no particular config was
# requested, then compute all.
for config in builder.BUILDER_CONFIGS:
builder_for_config = tfds.builder(builder.name,
data_dir=FLAGS.data_dir,
config=config,
version=version)
download_and_prepare(builder_for_config)
else:
# If there is a slash in the name, then user requested a specific
# dataset configuration.
download_and_prepare(builder)
def main(argv):
del argv # unused arg
tf.enable_v2_behavior()
tf.io.gfile.makedirs(FLAGS.output_dir)
logging.info('Saving checkpoints at %s', FLAGS.output_dir)
tf.random.set_seed(FLAGS.seed)
if FLAGS.use_gpu:
logging.info('Use GPU')
strategy = tf.distribute.MirroredStrategy()
else:
logging.info('Use TPU at %s',
FLAGS.tpu if FLAGS.tpu is not None else 'local')
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=FLAGS.tpu)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.experimental.TPUStrategy(resolver)
def train_input_fn(ctx):
"""Sets up local (per-core) dataset batching."""
dataset = utils.load_distributed_dataset(
split=tfds.Split.TRAIN,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size // FLAGS.num_models,
drop_remainder=True,
use_bfloat16=FLAGS.use_bfloat16,
proportion=FLAGS.train_proportion)
if ctx and ctx.num_input_pipelines > 1:
dataset = dataset.shard(ctx.num_input_pipelines,
ctx.input_pipeline_id)
return dataset
# No matter what percentage of training proportion, we still evaluate the
# model on the full test dataset.
def test_input_fn(ctx):
"""Sets up local (per-core) dataset batching."""
dataset = utils.load_distributed_dataset(
split=tfds.Split.TEST,
name=FLAGS.dataset,
batch_size=FLAGS.per_core_batch_size // FLAGS.num_models,
drop_remainder=True,
use_bfloat16=FLAGS.use_bfloat16)
if ctx and ctx.num_input_pipelines > 1:
dataset = dataset.shard(ctx.num_input_pipelines,
ctx.input_pipeline_id)
return dataset
train_dataset = strategy.experimental_distribute_datasets_from_function(
train_input_fn)
test_dataset = strategy.experimental_distribute_datasets_from_function(
test_input_fn)
ds_info = tfds.builder(FLAGS.dataset).info
batch_size = ((FLAGS.per_core_batch_size // FLAGS.num_models) *
FLAGS.num_cores)
# Train_proportion is a float so need to convert steps_per_epoch to int.
steps_per_epoch = int(
(ds_info.splits['train'].num_examples * FLAGS.train_proportion) //
batch_size)
steps_per_eval = ds_info.splits['test'].num_examples // batch_size
if FLAGS.use_bfloat16:
policy = tf.keras.mixed_precision.experimental.Policy('mixed_bfloat16')
tf.keras.mixed_precision.experimental.set_policy(policy)
with strategy.scope():
logging.info('Building Keras ResNet-32 model')
model = batchensemble_model.ensemble_resnet_v1(
input_shape=ds_info.features['image'].shape,
depth=32,
num_classes=ds_info.features['label'].num_classes,
width_multiplier=4,
num_models=FLAGS.num_models,
random_sign_init=FLAGS.random_sign_init,
dropout_rate=FLAGS.dropout_rate,
l2=FLAGS.l2)
logging.info('Model input shape: %s', model.input_shape)
logging.info('Model output shape: %s', model.output_shape)
logging.info('Model number of weights: %s', model.count_params())
base_lr = FLAGS.base_learning_rate * batch_size / 128
lr_schedule = utils.ResnetLearningRateSchedule(steps_per_epoch,
base_lr, _LR_SCHEDULE)
optimizer = tf.keras.optimizers.SGD(lr_schedule,
momentum=0.9,
nesterov=True)
train_loss = tf.keras.metrics.Mean('train_loss', dtype=tf.float32)
train_nll = tf.keras.metrics.Mean('train_nll', dtype=tf.float32)
train_accuracy = tf.keras.metrics.SparseCategoricalAccuracy(
'train_accuracy', dtype=tf.float32)
test_nll = tf.keras.metrics.Mean('test_nll', dtype=tf.float32)
test_accuracy = tf.keras.metrics.SparseCategoricalAccuracy(
'test_accuracy', dtype=tf.float32)
test_nlls = []
test_accs = []
for i in range(FLAGS.num_models):
test_nlls.append(
tf.keras.metrics.Mean('test_nll_{}'.format(i),
dtype=tf.float32))
test_accs.append(
tf.keras.metrics.SparseCategoricalAccuracy(
'test_accuracy_{}'.format(i), dtype=tf.float32))
checkpoint = tf.train.Checkpoint(model=model, optimizer=optimizer)
latest_checkpoint = tf.train.latest_checkpoint(FLAGS.output_dir)
initial_epoch = 0
if latest_checkpoint:
# checkpoint.restore must be within a strategy.scope() so that optimizer
# slot variables are mirrored.
checkpoint.restore(latest_checkpoint)
logging.info('Loaded checkpoint %s', latest_checkpoint)
initial_epoch = optimizer.iterations.numpy() // steps_per_epoch
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.output_dir, 'summaries/'))
@tf.function
def train_step(iterator):
"""Training StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
if FLAGS.version2:
images = tf.tile(images, [FLAGS.num_models, 1, 1, 1])
labels = tf.tile(labels, [FLAGS.num_models])
with tf.GradientTape() as tape:
logits = model(images, training=True)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(
labels, logits, from_logits=True))
l2_loss = sum(model.losses)
loss = negative_log_likelihood + l2_loss
# Scale the loss given the TPUStrategy will reduce sum all gradients.
scaled_loss = loss / strategy.num_replicas_in_sync
grads = tape.gradient(scaled_loss, model.trainable_variables)
# Separate learning rate implementation.
if FLAGS.fast_weight_lr_multiplier != 1.0:
grads_and_vars = []
for grad, var in zip(grads, model.trainable_variables):
# Apply different learning rate on the fast weight approximate
# posterior/prior parameters. This is excludes BN and slow weights,
# but pay caution to the naming scheme.
if ('batch_norm' not in var.name
and 'kernel' not in var.name):
grads_and_vars.append(
(grad * FLAGS.fast_weight_lr_multiplier, var))
else:
grads_and_vars.append((grad, var))
optimizer.apply_gradients(grads_and_vars)
else:
optimizer.apply_gradients(zip(grads,
model.trainable_variables))
train_loss.update_state(loss)
train_nll.update_state(negative_log_likelihood)
train_accuracy.update_state(labels, logits)
strategy.experimental_run_v2(step_fn, args=(next(iterator), ))
@tf.function
def test_step(iterator):
"""Evaluation StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images, labels = inputs
images = tf.tile(images, [FLAGS.num_models, 1, 1, 1])
logits = model(images, training=False)
if FLAGS.use_bfloat16:
logits = tf.cast(logits, tf.float32)
probs = tf.nn.softmax(logits)
per_probs = tf.split(probs,
num_or_size_splits=FLAGS.num_models,
axis=0)
for i in range(FLAGS.num_models):
member_probs = per_probs[i]
member_loss = tf.keras.losses.sparse_categorical_crossentropy(
labels, member_probs)
test_nlls[i].update_state(member_loss)
test_accs[i].update_state(labels, member_probs)
probs = tf.reduce_mean(per_probs, axis=0)
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(labels, probs))
test_nll.update_state(negative_log_likelihood)
test_accuracy.update_state(labels, probs)
strategy.experimental_run_v2(step_fn, args=(next(iterator), ))
train_iterator = iter(train_dataset)
start_time = time.time()
for epoch in range(initial_epoch, FLAGS.train_epochs):
logging.info('Starting to run epoch: %s', epoch)
with summary_writer.as_default():
for step in range(steps_per_epoch):
train_step(train_iterator)
current_step = epoch * steps_per_epoch + (step + 1)
max_steps = steps_per_epoch * FLAGS.train_epochs
time_elapsed = time.time() - start_time
steps_per_sec = float(current_step) / time_elapsed
eta_seconds = (max_steps - current_step) / steps_per_sec
message = (
'{:.1%} completion: epoch {:d}/{:d}. {:.1f} steps/s. '
'ETA: {:.0f} min. Time elapsed: {:.0f} min'.format(
current_step / max_steps, epoch + 1,
FLAGS.train_epochs, steps_per_sec, eta_seconds / 60,
time_elapsed / 60))
if step % 20 == 0:
logging.info(message)
tf.summary.scalar('train/loss',
train_loss.result(),
step=epoch + 1)
tf.summary.scalar('train/negative_log_likelihood',
train_nll.result(),
step=epoch + 1)
tf.summary.scalar('train/accuracy',
train_accuracy.result(),
step=epoch + 1)
logging.info('Train Loss: %s, Accuracy: %s%%',
round(float(train_loss.result()), 4),
round(float(train_accuracy.result() * 100), 2))
train_loss.reset_states()
train_nll.reset_states()
train_accuracy.reset_states()
test_iterator = iter(test_dataset)
for step in range(steps_per_eval):
if step % 20 == 0:
logging.info('Starting to run eval step %s of epoch: %s',
step, epoch)
test_step(test_iterator)
tf.summary.scalar('test/negative_log_likelihood',
test_nll.result(),
step=epoch + 1)
tf.summary.scalar('test/accuracy',
test_accuracy.result(),
step=epoch + 1)
logging.info('Test NLL: %s, Accuracy: %s%%',
round(float(test_nll.result()), 4),
round(float(test_accuracy.result() * 100), 2))
test_nll.reset_states()
test_accuracy.reset_states()
for i in range(FLAGS.num_models):
tf.summary.scalar('test/ensemble_nll_member{}'.format(i),
test_nlls[i].result(),
step=epoch + 1)
tf.summary.scalar('test/ensemble_accuracy_member{}'.format(i),
test_accs[i].result(),
step=epoch + 1)
logging.info('Member %d Test loss: %s, accuracy: %s%%', i,
round(float(test_nlls[i].result()), 4),
round(float(test_accs[i].result() * 100), 2))
test_nlls[i].reset_states()
test_accs[i].reset_states()
if (epoch + 1) % 20 == 0:
checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved checkpoint to %s', checkpoint_name)
def load_dataset(split,
batch_size,
name,
use_bfloat16,
normalize=True,
drop_remainder=True,
repeat=False,
proportion=1.0,
data_dir=None):
"""Loads CIFAR dataset for training or testing.
Args:
split: tfds.Split.
batch_size: The global batch size to use.
name: A string indicates whether it is cifar10 or cifar100.
use_bfloat16: data type, bfloat16 precision or float32.
normalize: Whether to apply mean-std normalization on features.
drop_remainder: bool.
repeat: bool.
proportion: float, the proportion of dataset to be used.
data_dir: Directory where the dataset is stored to be loaded via tfds.load.
Optional, useful for loading datasets stored on GCS.
Returns:
Input function which returns a locally-sharded dataset batch.
"""
if use_bfloat16:
dtype = tf.bfloat16
else:
dtype = tf.float32
ds_info = tfds.builder(name).info
image_shape = ds_info.features['image'].shape
dataset_size = ds_info.splits['train'].num_examples
def preprocess(image, label):
"""Image preprocessing function."""
if split == tfds.Split.TRAIN:
image = tf.image.resize_with_crop_or_pad(
image, image_shape[0] + 4, image_shape[1] + 4)
image = tf.image.random_crop(image, image_shape)
image = tf.image.random_flip_left_right(image)
image = tf.image.convert_image_dtype(image, dtype)
if normalize:
mean = tf.constant([0.4914, 0.4822, 0.4465], dtype=dtype)
std = tf.constant([0.2023, 0.1994, 0.2010], dtype=dtype)
image = (image - mean) / std
label = tf.cast(label, dtype)
return image, label
if proportion == 1.0:
dataset = tfds.load(
name, split=split, data_dir=data_dir, as_supervised=True)
else:
new_name = '{}:3.*.*'.format(name)
if split == tfds.Split.TRAIN:
# use round instead of floor to resolve bug when e.g. using
# proportion = 1 - 0.8 = 0.19999999
new_split = 'train[:{}%]'.format(round(100 * proportion))
elif split == tfds.Split.VALIDATION:
new_split = 'train[-{}%:]'.format(round(100 * proportion))
elif split == tfds.Split.TEST:
new_split = 'test[:{}%]'.format(round(100 * proportion))
else:
raise ValueError('Provide valid split.')
dataset = tfds.load(new_name, split=new_split, as_supervised=True)
if split == tfds.Split.TRAIN or repeat:
dataset = dataset.shuffle(buffer_size=dataset_size).repeat()
dataset = dataset.map(preprocess,
num_parallel_calls=tf.data.experimental.AUTOTUNE)
dataset = dataset.batch(batch_size, drop_remainder=drop_remainder)
dataset = dataset.prefetch(tf.data.experimental.AUTOTUNE)
return dataset
def train_and_evaluate(config, workdir, vocab_filepath):
"""Runs a training and evaluation loop.
Args:
config: Model and training configuration.
workdir: Working directory for checkpoints and Tensorboard summaries. If
this contains a checkpoint, training will be resumed from the latest
checkpoint.
vocab_filepath: Absolute path to SentencePiece vocab model.
Raises:
ValueError: If training or eval batch sizes won't fit number of processes
and devices, or config is underspecified.
"""
n_processes = jax.process_count() # Number of processes
n_devices = jax.local_device_count() # Number of local devices per process
if config.train_batch_size % (n_processes * n_devices) > 0:
raise ValueError(
"Training batch size must be divisible by the total number of devices, "
"but training batch size = %d, while total number of devices = %d "
"(%d processes, each with %d devices)" %
(config.train_batch_size, n_processes * n_devices, n_processes,
n_devices))
if config.eval_batch_size % (n_processes * n_devices) > 0:
raise ValueError(
"Eval batch size must be divisible by the total number of devices, "
"but eval batch size = %d, while total number of devices = %d "
"(%d processes, each with %d devices)" %
(config.eval_batch_size, n_processes * n_devices, n_processes,
n_devices))
per_process_train_batch_size = config.train_batch_size // n_processes
per_process_eval_batch_size = config.eval_batch_size // n_processes
if jax.process_index() == 0:
train_summary_writer = tensorboard.SummaryWriter(
os.path.join(workdir, "train"))
eval_summary_writer = tensorboard.SummaryWriter(
os.path.join(workdir, "eval"))
else:
train_summary_writer = None
eval_summary_writer = None
rng = random.PRNGKey(config.seed)
rng, init_rng = random.split(rng)
ds_info = tfds.builder(config.dataset_name).info
num_train_examples = ds_info.splits[tfds.Split.TRAIN].num_examples
num_train_steps = int(num_train_examples * config.num_train_epochs //
config.train_batch_size)
num_warmup_steps = int(config.warmup_proportion * num_train_steps)
# Round up evaluation frequency to power of 10.
eval_frequency = int(
math.ceil(config.eval_proportion * num_train_steps / 10)) * 10
is_regression_task = config.dataset_name == "glue/stsb"
num_classes = (1 if is_regression_task else
ds_info.features["label"].num_classes)
tokenizer = spm.SentencePieceProcessor()
tokenizer.Load(vocab_filepath)
with config.unlocked():
config.vocab_size = tokenizer.GetPieceSize()
frozen_config = ml_collections.FrozenConfigDict(config)
model = models.SequenceClassificationModel(config=frozen_config,
n_classes=num_classes)
params = _init_params(model, init_rng, config)
optimizer = _create_adam_optimizer(config.learning_rate, params)
# In case current job restarts, ensure that we continue from where we left
# off.
optimizer = checkpoints.restore_checkpoint(workdir, optimizer)
start_step = int(optimizer.state.step)
# Otherwise, try to restore optimizer and model state from config checkpoint.
if (start_step == 0 and "init_checkpoint_dir" in config
and config.init_checkpoint_dir):
optimizer = _restore_pretrained_model(optimizer, params, config)
# We access model state only from optimizer via optimizer.target.
del params
optimizer = jax_utils.replicate(optimizer)
if is_regression_task:
compute_stats = functools.partial(_compute_regression_stats,
model=model,
pad_id=tokenizer.pad_id())
else:
compute_stats = functools.partial(_compute_classification_stats,
model=model,
pad_id=tokenizer.pad_id())
learning_rate_fn = train_utils.create_learning_rate_scheduler(
factors="constant * linear_warmup * linear_decay",
base_learning_rate=config.learning_rate,
warmup_steps=num_warmup_steps,
decay_steps=num_train_steps - num_warmup_steps,
)
glue_inputs = functools.partial(input_pipeline.glue_inputs,
dataset_name=config.dataset_name,
max_seq_length=config.max_seq_length,
tokenizer=tokenizer)
train_ds = glue_inputs(split=tfds.Split.TRAIN,
batch_size=per_process_train_batch_size,
training=True)
train_iter = iter(train_ds)
if config.dataset_name == "glue/mnli":
# MNLI contains two validation and test datasets.
split_suffixes = ["_matched", "_mismatched"]
else:
split_suffixes = [""]
# We init the first set of dropout PRNG keys, but update it afterwards inside
# the main pmap'd training update for performance.
rngs = random.split(rng, n_devices)
loss_and_metrics_fn = functools.partial(_compute_loss_and_metrics,
model=model,
pad_id=tokenizer.pad_id())
p_train_step = jax.pmap(functools.partial(
train_utils.train_step,
loss_and_metrics_fn=loss_and_metrics_fn,
learning_rate_fn=learning_rate_fn),
axis_name="batch")
p_eval_step = jax.pmap(functools.partial(train_utils.eval_step,
metric_fn=compute_stats),
axis_name="batch")
eval_metrics_fn = _create_eval_metrics_fn(config.dataset_name,
is_regression_task)
train_metrics = []
logging.info("Starting training loop.")
logging.info("====================")
for step in range(start_step, num_train_steps):
with jax.profiler.StepTraceContext("train", step_num=step):
train_batch = next(train_iter)
train_batch = common_utils.shard(train_batch)
optimizer, train_step_metrics, rngs = p_train_step(optimizer,
train_batch,
rng=rngs)
train_metrics.append(train_step_metrics)
if ((step > 0 and config.save_checkpoints_steps
and step % config.save_checkpoints_steps == 0)
or step == num_train_steps - 1) and jax.process_index() == 0:
# Save un-replicated optimizer and model state.
checkpoints.save_checkpoint(workdir,
jax_utils.unreplicate(optimizer),
step,
keep=2)
# Periodic metric handling.
if step % eval_frequency != 0 and step < num_train_steps - 1:
continue
logging.info("Gathering training metrics at step: %d", step)
train_metrics = common_utils.get_metrics(train_metrics)
train_summary = {
"loss":
jnp.sum(train_metrics["loss"]) /
jnp.sum(train_metrics["num_labels"]),
"learning_rate":
learning_rate_fn(step)
}
if not is_regression_task:
train_summary["accuracy"] = jnp.sum(
train_metrics["correct_predictions"]) / jnp.sum(
train_metrics["num_labels"])
if jax.process_index() == 0:
assert train_summary_writer
for key, val in train_summary.items():
train_summary_writer.scalar(key, val, step)
train_summary_writer.flush()
# Reset metric accumulation for next evaluation cycle.
train_metrics = []
logging.info("Gathering validation metrics at step: %d", step)
for split_suffix in split_suffixes:
eval_ds = glue_inputs(split=tfds.Split.VALIDATION + split_suffix,
batch_size=per_process_eval_batch_size,
training=False)
all_stats = []
for _, eval_batch in zip(range(config.max_num_eval_steps),
eval_ds):
all_stats.append(
_evaluate(p_eval_step, optimizer.target, eval_batch,
n_devices))
flat_stats = {}
for k in all_stats[
0]: # All batches of output stats are the same size
flat_stats[k] = np.concatenate([stat[k] for stat in all_stats],
axis=0)
eval_summary = eval_metrics_fn(flat_stats)
if jax.process_index() == 0:
assert eval_summary_writer
for key, val in eval_summary.items():
eval_summary_writer.scalar(f"{key}{split_suffix}", val,
step)
eval_summary_writer.flush()
def get_dataset_from_tf(name: str):
builder = tfds.builder(name=name)
builder.download_and_prepare()
ds = builder.as_dataset(shuffle_files=False)
ds_numpy = tfds.as_numpy(dataset=ds)
return ds_numpy
def main(argv):
del argv # unused arg
tf.io.gfile.makedirs(FLAGS.output_dir)
logging.info('Saving checkpoints at %s', FLAGS.output_dir)
tf.random.set_seed(FLAGS.seed)
ds_info = tfds.builder(FLAGS.dataset).info
batch_size = FLAGS.total_batch_size // FLAGS.ensemble_size
# Train_proportion is a float so need to convert steps_per_epoch to int.
steps_per_epoch = int(
(ds_info.splits['train'].num_examples * FLAGS.train_proportion) //
batch_size)
steps_per_eval = ds_info.splits['test'].num_examples // batch_size
num_classes = ds_info.features['label'].num_classes
data_dir = FLAGS.data_dir
if FLAGS.use_gpu:
logging.info('Use GPU')
strategy = tf.distribute.MirroredStrategy()
else:
logging.info('Use TPU at %s',
FLAGS.tpu if FLAGS.tpu is not None else 'local')
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=FLAGS.tpu)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
train_builder = ub.datasets.get(FLAGS.dataset,
data_dir=data_dir,
download_data=FLAGS.download_data,
split=tfds.Split.TRAIN,
validation_percent=1. -
FLAGS.train_proportion)
train_dataset = train_builder.load(batch_size=batch_size)
validation_dataset = None
steps_per_validation = 0
if FLAGS.train_proportion < 1.0:
validation_builder = ub.datasets.get(
FLAGS.dataset,
data_dir=data_dir,
download_data=FLAGS.download_data,
split=tfds.Split.VALIDATION,
validation_percent=1. - FLAGS.train_proportion,
drop_remainder=FLAGS.drop_remainder_for_eval)
validation_dataset = validation_builder.load(batch_size=batch_size)
validation_dataset = strategy.experimental_distribute_dataset(
validation_dataset)
steps_per_validation = validation_builder.num_examples // batch_size
clean_test_builder = ub.datasets.get(
FLAGS.dataset,
data_dir=data_dir,
download_data=FLAGS.download_data,
split=tfds.Split.TEST,
drop_remainder=FLAGS.drop_remainder_for_eval)
clean_test_dataset = clean_test_builder.load(batch_size=batch_size)
train_dataset = strategy.experimental_distribute_dataset(train_dataset)
test_datasets = {
'clean': strategy.experimental_distribute_dataset(clean_test_dataset),
}
steps_per_epoch = train_builder.num_examples // batch_size
steps_per_eval = clean_test_builder.num_examples // batch_size
num_classes = 100 if FLAGS.dataset == 'cifar100' else 10
if FLAGS.eval_on_ood:
ood_dataset_names = FLAGS.ood_dataset
ood_ds, steps_per_ood = ood_utils.load_ood_datasets(
ood_dataset_names,
clean_test_builder,
1 - FLAGS.train_proportion,
batch_size,
drop_remainder=FLAGS.drop_remainder_for_eval)
ood_datasets = {
name: strategy.experimental_distribute_dataset(ds)
for name, ds in ood_ds.items()
}
if FLAGS.corruptions_interval > 0:
extra_kwargs = {}
if FLAGS.dataset == 'cifar100':
data_dir = FLAGS.cifar100_c_path
corruption_types, _ = utils.load_corrupted_test_info(FLAGS.dataset)
for corruption_type in corruption_types:
for severity in range(1, 6):
dataset = ub.datasets.get(
f'{FLAGS.dataset}_corrupted',
corruption_type=corruption_type,
data_dir=data_dir,
severity=severity,
split=tfds.Split.TEST,
drop_remainder=FLAGS.drop_remainder_for_eval**
extra_kwargs).load(batch_size=batch_size)
test_datasets[f'{corruption_type}_{severity}'] = (
strategy.experimental_distribute_dataset(dataset))
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.output_dir, 'summaries'))
with strategy.scope():
logging.info('Building Keras model')
model = ub.models.wide_resnet_sngp_be(
input_shape=(32, 32, 3),
batch_size=batch_size,
depth=28,
width_multiplier=10,
num_classes=num_classes,
ensemble_size=FLAGS.ensemble_size,
random_sign_init=FLAGS.random_sign_init,
l2=FLAGS.l2,
use_gp_layer=FLAGS.use_gp_layer,
gp_input_dim=FLAGS.gp_input_dim,
gp_hidden_dim=FLAGS.gp_hidden_dim,
gp_scale=FLAGS.gp_scale,
gp_bias=FLAGS.gp_bias,
gp_input_normalization=FLAGS.gp_input_normalization,
gp_cov_discount_factor=FLAGS.gp_cov_discount_factor,
gp_cov_ridge_penalty=FLAGS.gp_cov_ridge_penalty,
use_spec_norm=FLAGS.use_spec_norm,
spec_norm_iteration=FLAGS.spec_norm_iteration,
spec_norm_bound=FLAGS.spec_norm_bound)
logging.info('Model input shape: %s', model.input_shape)
logging.info('Model output shape: %s', model.output_shape)
logging.info('Model number of weights: %s', model.count_params())
# Linearly scale learning rate and the decay epochs by vanilla settings.
base_lr = FLAGS.base_learning_rate * batch_size / 128
lr_decay_epochs = [(int(start_epoch_str) * FLAGS.train_epochs) // 200
for start_epoch_str in FLAGS.lr_decay_epochs]
lr_schedule = ub.schedules.WarmUpPiecewiseConstantSchedule(
steps_per_epoch,
base_lr,
decay_ratio=FLAGS.lr_decay_ratio,
decay_epochs=lr_decay_epochs,
warmup_epochs=FLAGS.lr_warmup_epochs)
optimizer = tf.keras.optimizers.SGD(lr_schedule,
momentum=1.0 -
FLAGS.one_minus_momentum,
nesterov=True)
metrics = {
'train/negative_log_likelihood':
tf.keras.metrics.Mean(),
'train/accuracy':
tf.keras.metrics.SparseCategoricalAccuracy(),
'train/loss':
tf.keras.metrics.Mean(),
'train/ece':
rm.metrics.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'test/negative_log_likelihood':
tf.keras.metrics.Mean(),
'test/accuracy':
tf.keras.metrics.SparseCategoricalAccuracy(),
'test/ece':
rm.metrics.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'test/stddev':
tf.keras.metrics.Mean(),
}
eval_dataset_splits = ['test']
if validation_dataset:
metrics.update({
'validation/negative_log_likelihood':
tf.keras.metrics.Mean(),
'validation/accuracy':
tf.keras.metrics.SparseCategoricalAccuracy(),
'validation/ece':
rm.metrics.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'validation/stddev':
tf.keras.metrics.Mean(),
})
eval_dataset_splits += ['validation']
if FLAGS.eval_on_ood:
ood_metrics = ood_utils.create_ood_metrics(
ood_dataset_names, tpr_list=FLAGS.ood_tpr_threshold)
metrics.update(ood_metrics)
for i in range(FLAGS.ensemble_size):
for dataset_split in eval_dataset_splits:
metrics[
f'{dataset_split}/nll_member_{i}'] = tf.keras.metrics.Mean(
)
metrics[f'{dataset_split}/accuracy_member_{i}'] = (
tf.keras.metrics.SparseCategoricalAccuracy())
if FLAGS.corruptions_interval > 0:
corrupt_metrics = {}
for intensity in range(1, 6):
for corruption in corruption_types:
dataset_name = '{0}_{1}'.format(corruption, intensity)
corrupt_metrics['test/nll_{}'.format(dataset_name)] = (
tf.keras.metrics.Mean())
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
corrupt_metrics['test/ece_{}'.format(dataset_name)] = (
rm.metrics.ExpectedCalibrationError(
num_bins=FLAGS.num_bins))
corrupt_metrics['test/stddev_{}'.format(dataset_name)] = (
tf.keras.metrics.Mean())
checkpoint = tf.train.Checkpoint(model=model, optimizer=optimizer)
latest_checkpoint = tf.train.latest_checkpoint(FLAGS.output_dir)
initial_epoch = 0
if latest_checkpoint:
# checkpoint.restore must be within a strategy.scope() so that optimizer
# slot variables are mirrored.
checkpoint.restore(latest_checkpoint)
logging.info('Loaded checkpoint %s', latest_checkpoint)
initial_epoch = optimizer.iterations.numpy() // steps_per_epoch
if FLAGS.saved_model_dir:
logging.info('Saved model dir : %s', FLAGS.saved_model_dir)
latest_checkpoint = tf.train.latest_checkpoint(
FLAGS.saved_model_dir)
checkpoint.restore(latest_checkpoint)
logging.info('Loaded checkpoint %s', latest_checkpoint)
if FLAGS.eval_only:
initial_epoch = FLAGS.train_epochs - 1 # Run just one epoch of eval
@tf.function
def train_step(iterator):
"""Training StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images = inputs['features']
labels = inputs['labels']
images = tf.tile(images, [FLAGS.ensemble_size, 1, 1, 1])
labels = tf.tile(labels, [FLAGS.ensemble_size])
with tf.GradientTape() as tape:
logits = model(images, training=True)
if isinstance(logits, (list, tuple)):
# If model returns a tuple of (logits, covmat), extract logits
logits, _ = logits
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(
labels, logits, from_logits=True))
l2_loss = sum(model.losses)
loss = negative_log_likelihood + l2_loss
# Scale the loss given the TPUStrategy will reduce sum all gradients.
scaled_loss = loss / strategy.num_replicas_in_sync
grads = tape.gradient(scaled_loss, model.trainable_variables)
# Separate learning rate implementation.
if FLAGS.fast_weight_lr_multiplier != 1.0:
grads_and_vars = []
for grad, var in zip(grads, model.trainable_variables):
# Apply different learning rate on the fast weight approximate
# posterior/prior parameters. This is excludes BN and slow weights,
# but pay caution to the naming scheme.
if ('batch_norm' not in var.name
and 'kernel' not in var.name):
grads_and_vars.append(
(grad * FLAGS.fast_weight_lr_multiplier, var))
else:
grads_and_vars.append((grad, var))
optimizer.apply_gradients(grads_and_vars)
else:
optimizer.apply_gradients(zip(grads,
model.trainable_variables))
probs = tf.nn.softmax(logits)
metrics['train/ece'].add_batch(probs, label=labels)
metrics['train/loss'].update_state(loss)
metrics['train/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['train/accuracy'].update_state(labels, logits)
for _ in tf.range(tf.cast(steps_per_epoch, tf.int32)):
strategy.run(step_fn, args=(next(iterator), ))
@tf.function
def test_step(iterator, dataset_split, dataset_name, num_steps):
"""Evaluation StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images = inputs['features']
labels = inputs['labels']
logits_list = []
stddev_list = []
for i in range(FLAGS.ensemble_size):
logits = model(images, training=False)
if isinstance(logits, (list, tuple)):
# If model returns a tuple of (logits, covmat), extract both
logits, covmat = logits
logits = mean_field_logits(
logits,
covmat,
mean_field_factor=FLAGS.gp_mean_field_factor)
else:
covmat = tf.eye(logits.shape[0])
stddev = tf.sqrt(tf.linalg.diag_part(covmat))
stddev_list.append(stddev)
logits_list.append(logits)
member_probs = tf.nn.softmax(logits)
member_loss = tf.keras.losses.sparse_categorical_crossentropy(
labels, member_probs)
metrics[f'{dataset_split}/nll_member_{i}'].update_state(
member_loss)
metrics[f'{dataset_split}/accuracy_member_{i}'].update_state(
labels, member_probs)
# Logits dimension is (num_samples, batch_size, num_classes).
logits_list = tf.stack(logits_list, axis=0)
stddev_list = tf.stack(stddev_list, axis=0)
stddev = tf.reduce_mean(stddev_list, axis=0)
probs_list = tf.nn.softmax(logits_list)
probs = tf.reduce_mean(probs_list, axis=0)
labels_broadcasted = tf.broadcast_to(
labels,
[FLAGS.ensemble_size, tf.shape(labels)[0]])
log_likelihoods = -tf.keras.losses.sparse_categorical_crossentropy(
labels_broadcasted, logits_list, from_logits=True)
negative_log_likelihood = tf.reduce_mean(
-tf.reduce_logsumexp(log_likelihoods, axis=[0]) +
tf.math.log(float(FLAGS.ensemble_size)))
if dataset_name == 'clean':
metrics[
f'{dataset_split}/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics[f'{dataset_split}/accuracy'].update_state(
labels, probs)
metrics[f'{dataset_split}/ece'].add_batch(probs, label=labels)
metrics[f'{dataset_split}/stddev'].update_state(stddev)
elif dataset_name.startswith('ood'):
ood_labels = 1 - inputs['is_in_distribution']
if FLAGS.dempster_shafer_ood:
ood_scores = ood_utils.DempsterShaferUncertainty(logits)
else:
ood_scores = 1 - tf.reduce_max(probs, axis=-1)
# Edgecase for if dataset_name contains underscores
ood_dataset_name = '_'.join(dataset_name.split('_')[1:])
for name, metric in metrics.items():
if ood_dataset_name in name:
metric.update_state(ood_labels, ood_scores)
elif FLAGS.corruptions_interval > 0:
corrupt_metrics['test/nll_{}'.format(
dataset_name)].update_state(negative_log_likelihood)
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)].update_state(labels, probs)
corrupt_metrics['test/ece_{}'.format(dataset_name)].add_batch(
probs, label=labels)
corrupt_metrics['test/stddev_{}'.format(
dataset_name)].update_state(stddev)
for _ in tf.range(tf.cast(num_steps, tf.int32)):
strategy.run(step_fn, args=(next(iterator), ))
metrics.update({'test/ms_per_example': tf.keras.metrics.Mean()})
train_iterator = iter(train_dataset)
start_time = time.time()
for epoch in range(initial_epoch, FLAGS.train_epochs):
logging.info('Starting to run epoch: %s', epoch)
train_step(train_iterator)
current_step = (epoch + 1) * steps_per_epoch
max_steps = steps_per_epoch * FLAGS.train_epochs
time_elapsed = time.time() - start_time
steps_per_sec = float(current_step) / time_elapsed
eta_seconds = (max_steps - current_step) / steps_per_sec
message = ('{:.1%} completion: epoch {:d}/{:d}. {:.1f} steps/s. '
'ETA: {:.0f} min. Time elapsed: {:.0f} min'.format(
current_step / max_steps, epoch + 1, FLAGS.train_epochs,
steps_per_sec, eta_seconds / 60, time_elapsed / 60))
logging.info(message)
if validation_dataset:
validation_iterator = iter(validation_dataset)
test_step(validation_iterator, 'validation', 'clean',
steps_per_validation)
datasets_to_evaluate = {'clean': test_datasets['clean']}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
datasets_to_evaluate = test_datasets
for dataset_name, test_dataset in datasets_to_evaluate.items():
test_iterator = iter(test_dataset)
logging.info('Testing on dataset %s', dataset_name)
logging.info('Starting to run eval at epoch: %s', epoch)
test_start_time = time.time()
test_step(test_iterator, 'test', dataset_name, steps_per_eval)
ms_per_example = (time.time() - test_start_time) * 1e6 / batch_size
metrics['test/ms_per_example'].update_state(ms_per_example)
logging.info('Done with testing on %s', dataset_name)
if FLAGS.eval_on_ood:
for dataset_name in ood_dataset_names:
ood_iterator = iter(
ood_datasets['ood_{}'.format(dataset_name)])
logging.info('Calculating OOD on dataset %s', dataset_name)
logging.info('Running OOD eval at epoch: %s', epoch)
test_step(ood_iterator, 'test', 'ood_{}'.format(dataset_name),
steps_per_ood[dataset_name])
logging.info('Done with OOD eval on %s', dataset_name)
corrupt_results = {}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
corrupt_results = utils.aggregate_corrupt_metrics(
corrupt_metrics, corruption_types)
logging.info('Train Loss: %.4f, Accuracy: %.2f%%',
metrics['train/loss'].result(),
metrics['train/accuracy'].result() * 100)
logging.info('Test NLL: %.4f, Accuracy: %.2f%%',
metrics['test/negative_log_likelihood'].result(),
metrics['test/accuracy'].result() * 100)
for i in range(FLAGS.ensemble_size):
logging.info(
'Member %d Test Loss: %.4f, Accuracy: %.2f%%', i,
metrics['test/nll_member_{}'.format(i)].result(),
metrics['test/accuracy_member_{}'.format(i)].result() * 100)
total_results = {
name: metric.result()
for name, metric in metrics.items()
}
total_results.update(corrupt_results)
# Metrics from Robustness Metrics (like ECE) will return a dict with a
# single key/value, instead of a scalar.
total_results = {
k: (list(v.values())[0] if isinstance(v, dict) else v)
for k, v in total_results.items()
}
with summary_writer.as_default():
for name, result in total_results.items():
tf.summary.scalar(name, result, step=epoch + 1)
for metric in metrics.values():
metric.reset_states()
if FLAGS.corruptions_interval > 0:
for metric in corrupt_metrics.values():
metric.reset_states()
if (FLAGS.checkpoint_interval > 0
and (epoch + 1) % FLAGS.checkpoint_interval == 0):
checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved checkpoint to %s', checkpoint_name)
final_checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved last checkpoint to %s', final_checkpoint_name)
with summary_writer.as_default():
hp.hparams({
'base_learning_rate': FLAGS.base_learning_rate,
'one_minus_momentum': FLAGS.one_minus_momentum,
'l2': FLAGS.l2,
'gp_mean_field_factor': FLAGS.gp_mean_field_factor,
'gp_input_dim': FLAGS.gp_input_dim,
'gp_scale': FLAGS.gp_scale,
'gp_hidden_dim': FLAGS.gp_hidden_dim,
'fast_weight_lr_multiplier': FLAGS.fast_weight_lr_multiplier,
'random_sign_init': FLAGS.random_sign_init,
})
def main(argv):
fmt = '[%(filename)s:%(lineno)s] %(message)s'
formatter = logging.PythonFormatter(fmt)
logging.get_absl_handler().setFormatter(formatter)
del argv # unused arg
tf.io.gfile.makedirs(FLAGS.output_dir)
logging.info('Saving checkpoints at %s', FLAGS.output_dir)
tf.random.set_seed(FLAGS.seed)
data_dir = None
if FLAGS.use_gpu:
logging.info('Use GPU')
strategy = tf.distribute.MirroredStrategy()
else:
logging.info('Use TPU at %s',
FLAGS.tpu if FLAGS.tpu is not None else 'local')
data_dir = FLAGS.data_dir
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=FLAGS.tpu)
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
ds_info = tfds.builder(FLAGS.dataset).info
batch_size = FLAGS.per_core_batch_size * FLAGS.num_cores
train_dataset_size = (ds_info.splits['train'].num_examples *
FLAGS.train_proportion)
steps_per_epoch = int(train_dataset_size / batch_size)
logging.info('Steps per epoch %s', steps_per_epoch)
logging.info('Size of the dataset %s',
ds_info.splits['train'].num_examples)
logging.info('Train proportion %s', FLAGS.train_proportion)
steps_per_eval = ds_info.splits['test'].num_examples // batch_size
num_classes = ds_info.features['label'].num_classes
train_dataset = ub.datasets.get(
FLAGS.dataset,
split=tfds.Split.TRAIN,
download_data=True,
validation_percent=1. - FLAGS.train_proportion,
data_dir=data_dir).load(batch_size=batch_size)
clean_test_dataset = ub.datasets.get(
FLAGS.dataset, split=tfds.Split.TEST,
data_dir=data_dir).load(batch_size=batch_size)
train_dataset = strategy.experimental_distribute_dataset(train_dataset)
test_datasets = {
'clean': strategy.experimental_distribute_dataset(clean_test_dataset),
}
if FLAGS.corruptions_interval > 0:
if FLAGS.dataset == 'cifar100':
data_dir = FLAGS.cifar100_c_path
corruption_types, _ = utils.load_corrupted_test_info(FLAGS.dataset)
for corruption_type in corruption_types:
for severity in range(1, 6):
dataset = ub.datasets.get(
f'{FLAGS.dataset}_corrupted',
corruption_type=corruption_type,
severity=severity,
split=tfds.Split.TEST,
data_dir=data_dir).load(batch_size=batch_size)
test_datasets[f'{corruption_type}_{severity}'] = (
strategy.experimental_distribute_dataset(dataset))
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.output_dir, 'summaries'))
with strategy.scope():
logging.info('Building ResNet model')
model = ub.models.wide_resnet(
input_shape=ds_info.features['image'].shape,
depth=28,
width_multiplier=10,
num_classes=num_classes,
l2=FLAGS.l2,
hps=_extract_hyperparameter_dictionary(),
version=2)
logging.info('Model input shape: %s', model.input_shape)
logging.info('Model output shape: %s', model.output_shape)
logging.info('Model number of weights: %s', model.count_params())
# Linearly scale learning rate and the decay epochs by vanilla settings.
base_lr = FLAGS.base_learning_rate * batch_size / 128
lr_decay_epochs = [(int(start_epoch_str) * FLAGS.train_epochs) // 200
for start_epoch_str in FLAGS.lr_decay_epochs]
lr_schedule = ub.schedules.WarmUpPiecewiseConstantSchedule(
steps_per_epoch,
base_lr,
decay_ratio=FLAGS.lr_decay_ratio,
decay_epochs=lr_decay_epochs,
warmup_epochs=FLAGS.lr_warmup_epochs)
optimizer = tf.keras.optimizers.SGD(lr_schedule,
momentum=0.9,
nesterov=True)
metrics = {
'train/negative_log_likelihood': tf.keras.metrics.Mean(),
'train/accuracy': tf.keras.metrics.SparseCategoricalAccuracy(),
'train/loss': tf.keras.metrics.Mean(),
'train/ece': um.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
'test/negative_log_likelihood': tf.keras.metrics.Mean(),
'test/accuracy': tf.keras.metrics.SparseCategoricalAccuracy(),
'test/ece': um.ExpectedCalibrationError(num_bins=FLAGS.num_bins),
}
if FLAGS.corruptions_interval > 0:
corrupt_metrics = {}
for intensity in range(1, 6):
for corruption in corruption_types:
dataset_name = '{0}_{1}'.format(corruption, intensity)
corrupt_metrics['test/nll_{}'.format(dataset_name)] = (
tf.keras.metrics.Mean())
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)] = (
tf.keras.metrics.SparseCategoricalAccuracy())
corrupt_metrics['test/ece_{}'.format(dataset_name)] = (
um.ExpectedCalibrationError(num_bins=FLAGS.num_bins))
checkpoint = tf.train.Checkpoint(model=model, optimizer=optimizer)
latest_checkpoint = tf.train.latest_checkpoint(FLAGS.output_dir)
initial_epoch = 0
if latest_checkpoint:
# checkpoint.restore must be within a strategy.scope() so that optimizer
# slot variables are mirrored.
checkpoint.restore(latest_checkpoint)
logging.info('Loaded checkpoint %s', latest_checkpoint)
initial_epoch = optimizer.iterations.numpy() // steps_per_epoch
@tf.function
def train_step(iterator):
"""Training StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images = inputs['features']
labels = inputs['labels']
with tf.GradientTape() as tape:
logits = model(images, training=True)
if FLAGS.label_smoothing == 0.:
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(
labels, logits, from_logits=True))
else:
one_hot_labels = tf.one_hot(tf.cast(labels, tf.int32),
num_classes)
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.categorical_crossentropy(
one_hot_labels,
logits,
from_logits=True,
label_smoothing=FLAGS.label_smoothing))
l2_loss = sum(model.losses)
loss = negative_log_likelihood + l2_loss
# Scale the loss given the TPUStrategy will reduce sum all gradients.
scaled_loss = loss / strategy.num_replicas_in_sync
grads = tape.gradient(scaled_loss, model.trainable_variables)
optimizer.apply_gradients(zip(grads, model.trainable_variables))
probs = tf.nn.softmax(logits)
metrics['train/ece'].update_state(labels, probs)
metrics['train/loss'].update_state(loss)
metrics['train/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['train/accuracy'].update_state(labels, logits)
strategy.run(step_fn, args=(next(iterator), ))
@tf.function
def test_step(iterator, dataset_name):
"""Evaluation StepFn."""
def step_fn(inputs):
"""Per-Replica StepFn."""
images = inputs['features']
labels = inputs['labels']
logits = model(images, training=False)
probs = tf.nn.softmax(logits)
negative_log_likelihood = tf.reduce_mean(
tf.keras.losses.sparse_categorical_crossentropy(labels, probs))
if dataset_name == 'clean':
metrics['test/negative_log_likelihood'].update_state(
negative_log_likelihood)
metrics['test/accuracy'].update_state(labels, probs)
metrics['test/ece'].update_state(labels, probs)
else:
corrupt_metrics['test/nll_{}'.format(
dataset_name)].update_state(negative_log_likelihood)
corrupt_metrics['test/accuracy_{}'.format(
dataset_name)].update_state(labels, probs)
corrupt_metrics['test/ece_{}'.format(
dataset_name)].update_state(labels, probs)
strategy.run(step_fn, args=(next(iterator), ))
metrics.update({'test/ms_per_example': tf.keras.metrics.Mean()})
metrics.update({'train/ms_per_example': tf.keras.metrics.Mean()})
train_iterator = iter(train_dataset)
start_time = time.time()
tb_callback = None
if FLAGS.collect_profile:
tb_callback = tf.keras.callbacks.TensorBoard(profile_batch=(100, 102),
log_dir=os.path.join(
FLAGS.output_dir,
'logs'))
tb_callback.set_model(model)
for epoch in range(initial_epoch, FLAGS.train_epochs):
logging.info('Starting to run epoch: %s', epoch)
for step in range(steps_per_epoch):
if tb_callback:
tb_callback.on_train_batch_begin(step)
train_start_time = time.time()
train_step(train_iterator)
ms_per_example = (time.time() -
train_start_time) * 1e6 / batch_size
metrics['train/ms_per_example'].update_state(ms_per_example)
current_step = epoch * steps_per_epoch + (step + 1)
max_steps = steps_per_epoch * FLAGS.train_epochs
time_elapsed = time.time() - start_time
steps_per_sec = float(current_step) / time_elapsed
eta_seconds = (max_steps - current_step) / steps_per_sec
message = ('{:.1%} completion: epoch {:d}/{:d}. {:.1f} steps/s. '
'ETA: {:.0f} min. Time elapsed: {:.0f} min'.format(
current_step / max_steps, epoch + 1,
FLAGS.train_epochs, steps_per_sec, eta_seconds / 60,
time_elapsed / 60))
if step % 20 == 0:
logging.info(message)
if tb_callback:
tb_callback.on_train_batch_end(step)
datasets_to_evaluate = {'clean': test_datasets['clean']}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
datasets_to_evaluate = test_datasets
for dataset_name, test_dataset in datasets_to_evaluate.items():
test_iterator = iter(test_dataset)
logging.info('Testing on dataset %s', dataset_name)
for step in range(steps_per_eval):
if step % 20 == 0:
logging.info('Starting to run eval step %s of epoch: %s',
step, epoch)
test_start_time = time.time()
test_step(test_iterator, dataset_name)
ms_per_example = (time.time() -
test_start_time) * 1e6 / batch_size
metrics['test/ms_per_example'].update_state(ms_per_example)
logging.info('Done with testing on %s', dataset_name)
corrupt_results = {}
if (FLAGS.corruptions_interval > 0
and (epoch + 1) % FLAGS.corruptions_interval == 0):
corrupt_results = utils.aggregate_corrupt_metrics(
corrupt_metrics, corruption_types)
logging.info('Train Loss: %.4f, Accuracy: %.2f%%',
metrics['train/loss'].result(),
metrics['train/accuracy'].result() * 100)
logging.info('Test NLL: %.4f, Accuracy: %.2f%%',
metrics['test/negative_log_likelihood'].result(),
metrics['test/accuracy'].result() * 100)
total_results = {
name: metric.result()
for name, metric in metrics.items()
}
total_results.update(corrupt_results)
with summary_writer.as_default():
for name, result in total_results.items():
tf.summary.scalar(name, result, step=epoch + 1)
for metric in metrics.values():
metric.reset_states()
if (FLAGS.checkpoint_interval > 0
and (epoch + 1) % FLAGS.checkpoint_interval == 0):
checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved checkpoint to %s', checkpoint_name)
final_checkpoint_name = checkpoint.save(
os.path.join(FLAGS.output_dir, 'checkpoint'))
logging.info('Saved last checkpoint to %s', final_checkpoint_name)
def main(_):
print(len(tfds.builder(FLAGS.dataset).BUILDER_CONFIGS))
def document_single_builder(builder):
"""Doc string for a single builder, with or without configs."""
mod_name = builder.__class__.__module__
cls_name = builder.__class__.__name__
mod_file = sys.modules[mod_name].__file__
if mod_file.endswith("pyc"):
mod_file = mod_file[:-1]
description_prefix = ""
if builder.builder_configs:
# Dataset with configs; document each one
config_docs = []
for config in builder.BUILDER_CONFIGS:
builder = tfds.builder(builder.name, config=config)
info = builder.info
# TODO(rsepassi): document the actual config object
config_doc = SINGLE_CONFIG_ENTRY.format(
builder_name=builder.name,
config_name=config.name,
description=config.description,
version=config.version,
feature_information=make_feature_information(info),
size=tfds.units.size_str(info.size_in_bytes),
)
config_docs.append(config_doc)
out_str = DATASET_WITH_CONFIGS_ENTRY.format(
snakecase_name=builder.name,
module_and_class="%s.%s" % (tfds_mod_name(mod_name), cls_name),
cls_url=cls_url(mod_name),
config_names="\n".join([
CONFIG_BULLET.format(
name=config.name,
description=config.description,
version=config.version,
size=tfds.units.size_str(
tfds.builder(builder.name,
config=config).info.size_in_bytes))
for config in builder.BUILDER_CONFIGS
]),
config_cls="%s.%s" %
(tfds_mod_name(mod_name), type(builder.builder_config).__name__),
configs="\n".join(config_docs),
urls=format_urls(info.urls),
url=url_from_info(info),
supervised_keys=str(info.supervised_keys),
citation=make_citation(info.citation),
statistics_information=make_statistics_information(info),
description=builder.info.description,
description_prefix=description_prefix,
)
else:
info = builder.info
out_str = DATASET_ENTRY.format(
snakecase_name=builder.name,
module_and_class="%s.%s" % (tfds_mod_name(mod_name), cls_name),
cls_url=cls_url(mod_name),
description=info.description,
description_prefix=description_prefix,
version=info.version,
feature_information=make_feature_information(info),
statistics_information=make_statistics_information(info),
urls=format_urls(info.urls),
url=url_from_info(info),
supervised_keys=str(info.supervised_keys),
citation=make_citation(info.citation),
size=tfds.units.size_str(info.size_in_bytes),
)
out_str = schema_org(builder) + "\n" + out_str
return out_str
def __init__(self,
split: str,
validation_percent: float = 0.0,
shuffle_buffer_size: Optional[int] = 16384,
num_parallel_parser_calls: int = 64,
try_gcs: bool = False,
download_data: bool = False,
is_training: Optional[bool] = None,
preprocessing_type: str = 'resnet',
use_bfloat16: bool = False,
normalize_input: bool = False,
image_size: int = 224,
resnet_preprocessing_resize_method: Optional[str] = None,
ensemble_size: int = 1,
one_hot: bool = False,
mixup_params: Dict[str, Any] = None,
run_mixup: bool = False,
**unused_kwargs: Dict[str, Any]):
"""Create an ImageNet tf.data.Dataset builder.
Args:
split: a dataset split, either a custom tfds.Split or one of the
tfds.Split enums [TRAIN, VALIDAITON, TEST] or their lowercase string
names.
validation_percent: the percent of the training set to use as a validation
set.
shuffle_buffer_size: the number of example to use in the shuffle buffer
for tf.data.Dataset.shuffle().
num_parallel_parser_calls: the number of parallel threads to use while
preprocessing in tf.data.Dataset.map().
try_gcs: Whether or not to try to use the GCS stored versions of dataset
files.
download_data: Whether or not to download data before loading.
is_training: Whether or not the given `split` is the training split. Only
required when the passed split is not one of ['train', 'validation',
'test', tfds.Split.TRAIN, tfds.Split.VALIDATION, tfds.Split.TEST].
preprocessing_type: Which type of preprocessing to apply, either
'inception' or 'resnet'.
use_bfloat16: Whether or not to use bfloat16 or float32 images.
normalize_input: Whether or not to normalize images by the ImageNet mean
and stddev.
image_size: The size of the image in pixels.
resnet_preprocessing_resize_method: Optional string for the resize method
to use for resnet preprocessing.
ensemble_size: `int` for number of ensemble members used in Mixup.
one_hot: whether or not to use one-hot labels.
mixup_params: hparams of mixup.
run_mixup: An explicit flag of whether or not to run mixup if
`mixup_params['mixup_alpha'] > 0`. By default, mixup will only be run in
training mode if `mixup_params['mixup_alpha'] > 0`.
**unused_kwargs: Ignored.
"""
name = 'imagenet2012'
dataset_builder = tfds.builder(name, try_gcs=try_gcs)
if is_training is None:
is_training = split in ['train', tfds.Split.TRAIN]
new_split = base.get_validation_percent_split(
dataset_builder,
validation_percent,
split,
test_split=tfds.Split.VALIDATION)
if preprocessing_type == 'inception':
decoders = {
'image': tfds.decode.SkipDecoding(),
}
else:
decoders = None
super(ImageNetDataset, self).__init__(
name=name,
dataset_builder=dataset_builder,
split=new_split,
is_training=is_training,
shuffle_buffer_size=shuffle_buffer_size,
num_parallel_parser_calls=num_parallel_parser_calls,
fingerprint_key='file_name',
download_data=download_data,
decoders=decoders)
self._preprocessing_type = preprocessing_type
self._use_bfloat16 = use_bfloat16
self._normalize_input = normalize_input
self._image_size = image_size
self._resnet_preprocessing_resize_method = resnet_preprocessing_resize_method
self._run_mixup = run_mixup
self.ensemble_size = ensemble_size
self._one_hot = one_hot
if mixup_params is None:
mixup_params = {}
self._mixup_params = mixup_params
