def validate(args, trainer, task, epoch_itr, subsets):
"""Evaluate the model on the validation set(s) and return the losses."""
if args.fixed_validation_seed is not None:
# set fixed seed for every validation
utils.set_torch_seed(args.fixed_validation_seed)
valid_losses = []
for subset in subsets:
logger.info('begin validation on "{}" subset'.format(subset))
# Initialize data iterator
itr = trainer.get_valid_iterator(subset).next_epoch_itr(shuffle=False)
progress = progress_bar.progress_bar(
itr,
log_format=args.log_format,
log_interval=args.log_interval,
epoch=epoch_itr.epoch,
prefix=f"valid on '{subset}' subset",
tensorboard_logdir=(
args.tensorboard_logdir if distributed_utils.is_master(args) else None
),
default_log_format=("tqdm" if not args.no_progress_bar else "simple"),
)
# create a new root metrics aggregator so validation metrics
# don't pollute other aggregators (e.g., train meters)
with metrics.aggregate(new_root=True) as agg:
for sample in progress:
trainer.valid_step(sample)
# log validation stats
stats = get_valid_stats(args, trainer, agg.get_smoothed_values())
progress.print(stats, tag=subset, step=trainer.get_num_updates())
valid_losses.append(stats[args.best_checkpoint_metric])
return valid_losses
def is_data_parallel_master(self):
return distributed_utils.is_master(self.args)
def main(args):
utils.import_user_module(args)
assert (
args.max_tokens is not None or args.max_sentences is not None
), "Must specify batch size either with --max-tokens or --max-sentences"
metrics.reset()
np.random.seed(args.seed)
utils.set_torch_seed(args.seed)
if distributed_utils.is_master(args):
checkpoint_utils.verify_checkpoint_directory(args.save_dir)
# Print args
logger.info(args)
# Setup task, e.g., translation, language modeling, etc.
task = tasks.setup_task(args)
# Load valid dataset (we load training data below, based on the latest checkpoint)
for valid_sub_split in args.valid_subset.split(","):
task.load_dataset(valid_sub_split, combine=False, epoch=1)
# Build model and criterion
model = task.build_model(args)
criterion = task.build_criterion(args)
logger.info(model)
logger.info("task: {} ({})".format(args.task, task.__class__.__name__))
logger.info("model: {} ({})".format(args.arch, model.__class__.__name__))
logger.info(
"criterion: {} ({})".format(args.criterion, criterion.__class__.__name__)
)
logger.info(
"num. model params: {} (num. trained: {})".format(
sum(p.numel() for p in model.parameters()),
sum(p.numel() for p in model.parameters() if p.requires_grad),
)
)
# (optionally) Configure quantization
if args.quantization_config_path is not None:
quantizer = quantization_utils.Quantizer(
config_path=args.quantization_config_path,
max_epoch=args.max_epoch,
max_update=args.max_update,
)
else:
quantizer = None
# Build trainer
if args.model_parallel_size == 1:
trainer = Trainer(args, task, model, criterion, quantizer)
else:
raise NotImplementedError('here')
logger.info(
"training on {} devices (GPUs/TPUs)".format(args.distributed_world_size)
)
logger.info(
"max tokens per GPU = {} and max sentences per GPU = {}".format(
args.max_tokens, args.max_sentences
)
)
# Load the latest checkpoint if one is available and restore the
# corresponding train iterator
extra_state, epoch_itr = checkpoint_utils.load_checkpoint(args, trainer)
# Train until the learning rate gets too small
max_epoch = args.max_epoch or math.inf
lr = trainer.get_lr()
train_meter = meters.StopwatchMeter()
train_meter.start()
while lr > args.min_lr and epoch_itr.next_epoch_idx <= max_epoch:
# train for one epoch
valid_losses, should_stop = train(args, trainer, task, epoch_itr)
if should_stop:
break
# only use first validation loss to update the learning rate
lr = trainer.lr_step(epoch_itr.epoch, valid_losses[0])
epoch_itr = trainer.get_train_iterator(
epoch_itr.next_epoch_idx,
# sharded data: get train iterator for next epoch
load_dataset=task.has_sharded_data("train"),
)
train_meter.stop()
logger.info("done training in {:.1f} seconds".format(train_meter.sum))
def train(args, trainer, task, epoch_itr):
"""Train the model for one epoch and return validation losses."""
# Initialize data iterator
itr = epoch_itr.next_epoch_itr(
fix_batches_to_gpus=args.fix_batches_to_gpus,
shuffle=(epoch_itr.next_epoch_idx > args.curriculum),
)
update_freq = (
args.update_freq[epoch_itr.epoch - 1]
if epoch_itr.epoch <= len(args.update_freq)
else args.update_freq[-1]
)
itr = iterators.GroupedIterator(itr, update_freq)
progress = progress_bar.progress_bar(
itr,
log_format=args.log_format,
log_interval=args.log_interval,
epoch=epoch_itr.epoch,
tensorboard_logdir=(
args.tensorboard_logdir if distributed_utils.is_master(args) else None
),
default_log_format=("tqdm" if not args.no_progress_bar else "simple"),
)
trainer.begin_epoch(epoch_itr.epoch)
valid_subsets = args.valid_subset.split(",")
should_stop = False
num_updates = trainer.get_num_updates()
for i, samples in enumerate(progress):
with metrics.aggregate("train_inner"), torch.autograd.profiler.record_function(
"train_step-%d" % i
):
log_output = trainer.train_step(samples)
if log_output is not None: # not OOM, overflow, ...
# log mid-epoch stats
num_updates = trainer.get_num_updates()
if num_updates % args.log_interval == 0:
stats = get_training_stats(metrics.get_smoothed_values("train_inner"))
progress.log(stats, tag="train_inner", step=num_updates)
# reset mid-epoch stats after each log interval
# the end-of-epoch stats will still be preserved
metrics.reset_meters("train_inner")
end_of_epoch = not itr.has_next()
valid_losses, should_stop = validate_and_save(
args, trainer, task, epoch_itr, valid_subsets, end_of_epoch
)
if should_stop:
break
# log end-of-epoch stats
logger.info("end of epoch {} (average epoch stats below)".format(epoch_itr.epoch))
stats = get_training_stats(metrics.get_smoothed_values("train"))
progress.print(stats, tag="train", step=num_updates)
# reset epoch-level meters
metrics.reset_meters("train")
return valid_losses, should_stop