def train_loop(
run_id,
dataset_dir,
ckpt_run_dir,
output_dir,
validation_only=False,
use_cuda=False,
light_target=False,
seed=42,
):
"""Train loop"""
train_epochs = 10
math_mode = "fp16"
rank = dist.get_rank()
world_size = dist.get_world_size()
# Dataset arguments
train_global_batch_size = 2**17 # Global batch size
max_bs = 2**13 # Max batch size for used hardware
update_freq = int(max(1, train_global_batch_size // (max_bs * world_size)))
max_tokens = int(train_global_batch_size // (world_size * update_freq))
max_source_positions, max_target_positions = 80, 80
seq_len_multiple = 2
left_pad = (True, False)
lang = ("en", "de")
# specific arch
model_args = deepcopy(DEFAULT_TRANSFORMER_ARCH)
model_args["max_source_positions"] = max_source_positions
model_args["max_target_positions"] = max_target_positions
model_args["share_all_embeddings"] = True
model_args["dropout"] = 0.1
model_args["softmax_type"] = "fast_fill"
lr = 1.976e-3
optimizer_args = {
"lr": lr,
"eps": 1e-9,
"betas": (0.9, 0.98),
}
scheduler_args = {
"base_lr": lr,
"warmup_init_lr": 0.0,
"warmup_steps": 1000
}
loss_scaling_fp16 = {
"init_scale": 2.0**7,
"scale_factor": 2,
"scale_window": 2000,
}
criterion_args = {"smoothing": 0.1, "fast_xentropy": True}
# Horovod stuff
use_horovod = (math_mode
== "fp16") and dist.get_backend() == dist.Backend.MPI
if use_horovod:
hvd.init()
logger.info("Using horovod rank={}".format(hvd.rank()))
tensor = torch.tensor([1])
res = hvd.allreduce(tensor, op=hvd.Sum)
assert res[0] == world_size
# Load train and validation datasets
train_set = WMT17Dataset(
dataset_dir,
download=True,
train=True,
shuffle=True,
lang=lang,
left_pad=left_pad,
max_positions=(max_source_positions, max_target_positions),
seq_len_multiple=seq_len_multiple,
)
validation_set = WMT17Dataset(
dataset_dir,
download=False,
test=True,
shuffle=True,
lang=lang,
left_pad=left_pad,
max_positions=(max_source_positions, max_target_positions),
seq_len_multiple=seq_len_multiple,
)
src_dict, trg_dict = train_set.src_dict, train_set.trg_dict
train_batches = get_batches(train_set,
max_tokens=max_tokens,
bsz_mult=8,
shuffle=True,
seed=seed)
val_batches = get_batches(validation_set,
max_tokens=max_tokens,
bsz_mult=8,
shuffle=False)
train_batches = equalize_batches(train_batches, world_size, seed=seed)
# Partition by rank
train_batches = partition_dataset_by_rank(train_batches, rank, world_size)
val_batches = partition_dataset_by_rank(val_batches, rank, world_size)
total_train_points = sum(len(b) for b in train_batches)
validate_every = update_freq * round(
len(train_batches) * 0.30 / update_freq) # Validate every 30%
assert (validate_every % update_freq) == 0
logger.info("Using {} total train points, {} batches".format(
total_train_points, len(train_batches)))
train_loader = DataLoader(
train_set,
num_workers=1,
pin_memory=False,
collate_fn=train_set.collater,
batch_sampler=train_batches,
)
val_loader = DataLoader(
validation_set,
num_workers=1,
pin_memory=False,
collate_fn=validation_set.collater,
batch_sampler=val_batches,
)
model = TransformerModel(Arguments(model_args), src_dict, trg_dict)
criterion = LabelSmoothing(padding_idx=src_dict.pad(), **criterion_args)
if use_cuda:
model = model.cuda()
criterion = criterion.cuda()
fp_optimizer, optimizer, model = build_optimizer(
model,
optimizer_args,
math_mode=math_mode,
scaling_args=loss_scaling_fp16,
use_horovod=use_horovod,
use_cuda=use_cuda,
)
scheduler = SQRTTimeDecayLRWithWarmup(optimizer, **scheduler_args)
metrics = [BLEUScore(use_raw=True)]
checkpointer = Checkpointer(ckpt_run_dir=ckpt_run_dir,
rank=rank,
freq=CheckpointFreq.BEST)
translator = SequenceGenerator(
model,
src_dict=deepcopy(src_dict),
trg_dict=deepcopy(trg_dict),
beam_size=4,
stop_early=True,
normalize_scores=True,
len_penalty=0.6,
sampling=False,
sampling_topk=-1,
minlen=1,
)
if not validation_only:
if light_target:
goal = task4_time_to_bleu_goal(20)
else:
goal = task4_time_to_bleu_goal(25)
num_batches_per_device_train = len(train_loader)
tracker = Tracker(metrics, run_id, rank, goal=goal)
dist.barrier()
tracker.start()
for epoch in range(0, train_epochs):
if torch.cuda.is_available():
torch.cuda.empty_cache()
model.train()
tracker.train()
iter_sample_size = 0
for batch_idx, sample in enumerate(train_loader):
tracker.batch_start()
sample = prepare_batch(sample, use_cuda=use_cuda)
tracker.record_batch_load()
is_last = batch_idx == len(train_loader)
update = (batch_idx % update_freq) == update_freq - 1
init = (batch_idx % update_freq) == 0
# Clear gradients in the optimizer.
if init:
fp_optimizer.zero_grad()
iter_sample_size = 0
tracker.record_batch_init()
# Compute the output
output = model(**sample["net_input"])
tracker.record_batch_fwd_pass()
loss, sample_size = compute_loss(sample, output, criterion)
loss_per_sample = loss.item() / sample_size
iter_sample_size += sample_size
tracker.record_batch_comp_loss()
# Backprop
fp_optimizer.backward_loss(loss)
tracker.record_batch_backprop()
if update or is_last:
# Get batch size over all workers
full_bs = get_full_batch_size(iter_sample_size,
world_size=world_size,
use_cuda=use_cuda)
updated = opt_step(
fp_optimizer,
tracker,
full_bs,
update_freq,
math_mode,
world_size,
)
if updated:
scheduler.step()
tracker.batch_end()
record_train_batch_stats(
batch_idx=batch_idx,
loss=loss_per_sample,
output=torch.Tensor([0]),
metric_results={},
tracker=tracker,
num_batches_per_device_train=num_batches_per_device_train,
)
if (batch_idx + 1) % validate_every == 0:
if torch.cuda.is_available():
torch.cuda.empty_cache()
metric_values, loss = validation_round(
val_loader,
metrics,
criterion,
translator,
tracker=tracker,
use_cuda=use_cuda,
)
record_validation_stats(metric_values, loss, tracker, rank)
if tracker.goal_reached:
break
model.train()
tracker.train()
if torch.cuda.is_available():
torch.cuda.empty_cache()
metric_values, loss = validation_round(
val_loader,
metrics,
criterion,
translator,
tracker=tracker,
use_cuda=use_cuda,
)
is_best = record_validation_stats(metric_values, loss, tracker,
rank)
checkpointer.save(
tracker,
model,
optimizer,
scheduler,
tracker.current_epoch,
is_best,
)
tracker.epoch_end()
if tracker.goal_reached:
print("Goal Reached!")
time.sleep(10)
return
else:
cecf = CheckpointsEvaluationControlFlow(
ckpt_dir=ckpt_run_dir,
rank=rank,
world_size=world_size,
checkpointer=checkpointer,
model=model,
epochs=train_epochs,
loss_function=criterion,
metrics=metrics,
use_cuda=use_cuda,
dtype="fp32",
max_batch_per_epoch=None,
)
train_stats = cecf.evaluate_by_epochs(train_loader)
with open(os.path.join(output_dir, "train_stats.json"), "w") as f:
json.dump(train_stats, f)
def test_tracker():
tracker = Tracker([TopKAccuracy(5)], 1, 0)
assert tracker is not None
class TrainValidation(object):
r"""Train and validate a model.
Args:
model (:obj:`torch.nn.Module`): a pytorch model to be trained and validated.
optimizer (:obj:`torch.optim.Optimizer`): an optimizer for the given model.
loss_function (:obj:`torch.nn.modules.loss._Loss`): loss function.
metrics (:obj:`list` of :obj:`mlbench_core.evaluation.pytorch.*`): metrics like TopKAccuracy.
scheduler (:obj:`mlbench_core.lr_scheduler.pytorch.lr.*`): a scheduler for hyperparameters.
batch_size (int): The size of batches provided by the dataloader
train_epochs (int): The number of epochs to train for
rank (int): The rank of the current workers
world_size (int): The total number of workers
run_id (str): The id of the current run
dtype (str): The datatype to use for the dataloader data
validate (bool): Whether to run validation on the val dataset. Default: `True`
schedule_per (str): When to perform a step for the lr scheduler, one of
`epoch` or `batch`. Default: `epoch`
checkpoint (:obj:`Checkpointer`): Class that handles checkpointing. Default: `None`
transform_target_type (str): dtype to transform the target to. Not used. Default: `None`
average_models (bool): Whether to average models together. Default: `False`
use_cuda (bool): Whether to train on GPU or not. Default: `False`
max_batch_per_epoch (int): Maximum number of batches per epoch. Whole dataset
is used if not specified. Default: `None`
tracker (:obj:`mlbench_core.utils.Tracker`): Tracker for the controlflow. Default: `None`
"""
def __init__(self, model, optimizer, loss_function, metrics, scheduler,
batch_size, train_epochs, rank, world_size, run_id, dtype,
validate=True, schedule_per='epoch', checkpoint=None,
transform_target_type=None, average_models=False,
use_cuda=False, max_batch_per_epoch=None, tracker=None):
self.batch_size = batch_size
self.train_epochs = train_epochs
self.model = model
self.optimizer = optimizer
self.scheduler = scheduler
self.schedule_per = schedule_per
self.perform_validation = validate
self.checkpoint = checkpoint
self.model = model
self.optimizer = optimizer
self.loss_function = loss_function
self.metrics = metrics
self.scheduler = scheduler
self.batch_size = batch_size
self.rank = rank
self.run_id = run_id
self.dtype = dtype
self.schedule_per = schedule_per
self.transform_target_type = transform_target_type
self.use_cuda = use_cuda
self.max_batch_per_epoch = max_batch_per_epoch
if tracker:
self.tracker = tracker
else:
self.tracker = Tracker(metrics, run_id, rank)
def _get_dataloader_stats(self, dataloader_train, dataloader_val):
""" Sets the stats for the supplied dataloaders
Args:
dataloader_train (:obj:`torch.utils.data.DataLoader`): The train set
dataloader_val (:obj:`torch.utils.data.DataLoader`): The validation set
"""
self.num_batches_per_device_train = len(dataloader_train)
self.num_batches_per_device_val = len(dataloader_val)
def run(self, dataloader_train=None, dataloader_val=None,
dataloader_train_fn=None, dataloader_val_fn=None, resume=False,
repartition_per_epoch=False):
"""Execute training and (possibly) validation
`dataloader_train` and `dataloader_train_fn` are mutually exclusive.
`dataloader_val` and `dataloader_val_fn` are mutually exclusive.
Args:
dataloader_train (:obj:`torch.utils.data.DataLoader`): A dataloader for the train set.
Default: `None`
dataloader_val (:obj:`torch.utils.data.DataLoader`): A dataloader for the val set.
Default: `None`
dataloader_train_fn (:func:`Function`): A function returning a :obj:`torch.utils.data.DataLoader`
for the train set. Default: `None`
dataloader_val_fn (:func:`Function`): A function returning a :obj:`torch.utils.data.DataLoader`
for the val set. Default: `None`
resume (bool): Whether this is a resume of a previous run or not. Default: `False`
repartition_per_epoch (bool): Whether to repartition the dataset again every epoch.
Requires dataloader_train_fn and/or dataloader_val_fn to be set. Default: `False`
"""
if not dataloader_train_fn and not dataloader_train:
raise ValueError(
"One of dataloader_train_fn or dataloader_train must be set")
if not dataloader_val_fn and not dataloader_val:
raise ValueError(
"One of dataloader_val_fn or dataloader_val must be set")
if dataloader_train_fn:
dataloader_train = dataloader_train_fn()
if dataloader_val_fn:
dataloader_val = dataloader_val_fn()
self._get_dataloader_stats(dataloader_train, dataloader_val)
# define some parameters for training.
logger.info("There are {train_epochs} epochs, {num_batches} "
"mini-batches per epoch (batch size: {batch_size})."
.format(
train_epochs=self.train_epochs,
num_batches=self.num_batches_per_device_train,
batch_size=self.batch_size))
# Initialize Tracker or resume from checkpoint
if resume:
start_epoch = self.tracker.current_epoch + 1
else:
start_epoch = 0
dist.barrier()
for epoch in range(start_epoch, self.train_epochs):
# Per epoch information.
logger.info("Current epoch : {} : lr={}"
.format(epoch, self.scheduler.get_lr()))
train_round(dataloader_train, self.model, self.optimizer,
self.loss_function, self.metrics, self.scheduler,
self.dtype, self.schedule_per,
self.transform_target_type, self.use_cuda,
self.max_batch_per_epoch, self.tracker)
is_best = False
if self.perform_validation:
is_best = validation_round(dataloader_val, self.model,
self.loss_function, self.metrics,
self.run_id, self.rank, self.dtype,
self.transform_target_type,
self.use_cuda,
self.max_batch_per_epoch,
self.tracker)
if self.checkpoint:
self.checkpoint.save(self.tracker, self.model,
self.optimizer, self.scheduler,
self.tracker.current_epoch, is_best)
# Shuffle the dataset across nodes
if repartition_per_epoch:
if dataloader_train_fn:
dataloader_train = dataloader_train_fn()
if dataloader_val_fn:
dataloader_val = dataloader_val_fn()
self._get_dataloader_stats(dataloader_train, dataloader_val)
self.tracker.epoch_end()
