def _create_dataset(self, dataset_name):
"""Helper function for creating a dataset."""
return dataset_factory.create_dataset(
dataset_name,
self._batch_size,
self._batch_size_test,
shuffle_buffer_size=self._shuffle_buffer_size)
def setUp(self):
super().setUp()
self._batch_size = 128 # Note: Tests are run on GPU/TPU.
self._batch_size_test = 128
self._shuffle_buffer_size = 1024
self._rng = jax.random.PRNGKey(42)
self._input_shape = ((self._batch_size, 28, 28, 1), jnp.float32)
self._num_classes = 10
self._num_epochs = 1
self._learning_rate_fn = lambda _: 0.01
self._weight_decay = 0.0001
self._momentum = 0.9
self._rng = jax.random.PRNGKey(42)
self._min_loss = jnp.finfo(float).eps
self._max_loss = 2.0 * math.log(self._num_classes)
self._dataset_name = 'MNIST'
self._model_name = 'MNIST_CNN'
self._summarywriter = tensorboard.SummaryWriter('/tmp/')
self._dataset = dataset_factory.create_dataset(
self._dataset_name,
self._batch_size,
self._batch_size_test,
shuffle_buffer_size=self._shuffle_buffer_size)
self._model, self._state = model_factory.create_model(
self._model_name,
self._rng, (self._input_shape, ),
num_classes=self._num_classes)
self._optimizer = flax.optim.Momentum(
learning_rate=self._learning_rate_fn(0),
beta=self._momentum,
weight_decay=self._weight_decay)
experiment_dir = path.join(FLAGS.experiment_dir, str(work_unit_id))
logging.info('Saving experimental results to %s', experiment_dir)
host_count = jax.host_count()
local_device_count = jax.local_device_count()
logging.info('Device count: %d, host count: %d, local device count: %d',
jax.device_count(), host_count, local_device_count)
if jax.host_id() == 0:
summary_writer = tensorboard.SummaryWriter(experiment_dir)
dataset = dataset_factory.create_dataset(
FLAGS.dataset,
FLAGS.batch_size,
FLAGS.batch_size_test,
shuffle_buffer_size=FLAGS.shuffle_buffer_size)
logging.info('Training %s on the %s dataset...', FLAGS.model, FLAGS.dataset)
rng = jax.random.PRNGKey(FLAGS.random_seed)
input_shape = (1,) + dataset.shape
base_model, _ = model_factory.create_model(
FLAGS.model,
rng, ((input_shape, jnp.float32),),
num_classes=dataset.num_classes)
initial_model, initial_state = model_factory.create_model(
FLAGS.model,
def run_training():
"""Trains a model."""
print('Logging to {}'.format(FLAGS.log_dir))
work_unit_id = uuid.uuid4()
experiment_dir = path.join(FLAGS.experiment_dir, str(work_unit_id))
logging.info('Saving experimental results to %s', experiment_dir)
host_count = jax.host_count()
local_device_count = jax.local_device_count()
logging.info('Device count: %d, host count: %d, local device count: %d',
jax.device_count(), host_count, local_device_count)
if jax.host_id() == 0:
summary_writer = tensorboard.SummaryWriter(experiment_dir)
dataset = dataset_factory.create_dataset(
FLAGS.dataset,
FLAGS.batch_size,
FLAGS.batch_size_test,
shuffle_buffer_size=FLAGS.shuffle_buffer_size)
logging.info('Training %s on the %s dataset...', FLAGS.model,
FLAGS.dataset)
rng = jax.random.PRNGKey(FLAGS.random_seed)
input_shape = (1, ) + dataset.shape
model, initial_state = model_factory.create_model(
FLAGS.model,
rng, ((input_shape, np.float32), ),
num_classes=dataset.num_classes)
if FLAGS.optimizer == 'Adam':
optimizer = flax.optim.Adam(learning_rate=FLAGS.lr,
weight_decay=FLAGS.weight_decay)
elif FLAGS.optimizer == 'Momentum':
optimizer = flax.optim.Momentum(learning_rate=FLAGS.lr,
beta=FLAGS.momentum,
weight_decay=FLAGS.weight_decay,
nesterov=False)
steps_per_epoch = dataset.get_train_len() // FLAGS.batch_size
if FLAGS.lr_schedule == 'constant':
lr_fn = lr_schedule.create_constant_learning_rate_schedule(
FLAGS.lr, steps_per_epoch)
elif FLAGS.lr_schedule == 'stepped':
lr_schedule_steps = ast.literal_eval(FLAGS.lr_schedule_steps)
lr_fn = lr_schedule.create_stepped_learning_rate_schedule(
FLAGS.lr, steps_per_epoch, lr_schedule_steps)
elif FLAGS.lr_schedule == 'cosine':
lr_fn = lr_schedule.create_cosine_learning_rate_schedule(
FLAGS.lr, steps_per_epoch, FLAGS.epochs)
else:
raise ValueError('Unknown LR schedule type {}'.format(
FLAGS.lr_schedule))
if jax.host_id() == 0:
trainer = training.Trainer(
optimizer,
model,
initial_state,
dataset,
rng,
summary_writer=summary_writer,
)
else:
trainer = training.Trainer(optimizer, model, initial_state, dataset,
rng)
_, best_metrics = trainer.train(FLAGS.epochs,
lr_fn=lr_fn,
update_iter=FLAGS.update_iterations,
update_epoch=FLAGS.update_epoch)
logging.info('Best metrics: %s', str(best_metrics))
if jax.host_id() == 0:
for label, value in best_metrics.items():
summary_writer.scalar('best/{}'.format(label), value,
FLAGS.epochs * steps_per_epoch)
summary_writer.close()
