def main():
args = get_config()
world_size = flow.env.get_world_size()
if args.train_global_batch_size is None:
args.train_global_batch_size = args.train_batch_size * world_size
else:
assert args.train_global_batch_size % args.train_batch_size == 0
if args.val_global_batch_size is None:
args.val_global_batch_size = args.val_batch_size * world_size
else:
assert args.val_global_batch_size % args.val_batch_size == 0
flow.boxing.nccl.set_fusion_threshold_mbytes(args.nccl_fusion_threshold_mb)
flow.boxing.nccl.set_fusion_max_ops_num(args.nccl_fusion_max_ops)
if args.with_cuda:
device = "cuda"
else:
device = "cpu"
print("Device is: ", device)
print("Creating Dataloader")
train_data_loader = OfRecordDataLoader(
ofrecord_dir=args.ofrecord_path,
mode="train",
dataset_size=args.train_dataset_size,
batch_size=args.train_global_batch_size,
data_part_num=args.train_data_part,
seq_length=args.seq_length,
max_predictions_per_seq=args.max_predictions_per_seq,
consistent=args.use_consistent,
)
test_data_loader = OfRecordDataLoader(
ofrecord_dir=args.ofrecord_path,
mode="test",
dataset_size=1024,
batch_size=args.val_global_batch_size,
data_part_num=4,
seq_length=args.seq_length,
max_predictions_per_seq=args.max_predictions_per_seq,
consistent=args.use_consistent,
)
print("Building BERT Model")
hidden_size = 64 * args.num_attention_heads
intermediate_size = 4 * hidden_size
bert_model = BertForPreTraining(
args.vocab_size,
args.seq_length,
hidden_size,
args.num_hidden_layers,
args.num_attention_heads,
intermediate_size,
nn.GELU(),
args.hidden_dropout_prob,
args.attention_probs_dropout_prob,
args.max_position_embeddings,
args.type_vocab_size,
)
# Load the same initial parameters with lazy model.
# from utils.compare_lazy_outputs import load_params_from_lazy
# load_params_from_lazy(
# bert_model.state_dict(),
# "../../OneFlow-Benchmark/LanguageModeling/BERT/initial_model",
# )
assert id(bert_model.cls.predictions.decoder.weight) == id(
bert_model.bert.embeddings.word_embeddings.weight
)
ns_criterion = nn.CrossEntropyLoss(reduction="mean")
mlm_criterion = nn.CrossEntropyLoss(reduction="none")
if args.use_consistent:
placement = flow.env.all_device_placement("cuda")
bert_model = bert_model.to_consistent(
placement=placement, sbp=flow.sbp.broadcast
)
else:
bert_model.to(device)
ns_criterion.to(device)
mlm_criterion.to(device)
optimizer = build_optimizer(
args.optim_name,
bert_model,
args.lr,
args.weight_decay,
weight_decay_excludes=["bias", "LayerNorm", "layer_norm"],
clip_grad_max_norm=1,
clip_grad_norm_type=2.0,
)
steps = args.epochs * len(train_data_loader)
warmup_steps = int(steps * args.warmup_proportion)
lr_scheduler = PolynomialLR(optimizer, steps=steps, end_learning_rate=0.0)
lr_scheduler = flow.optim.lr_scheduler.WarmUpLR(
lr_scheduler, warmup_factor=0, warmup_iters=warmup_steps, warmup_method="linear"
)
def get_masked_lm_loss(
logit, masked_lm_labels, label_weights, max_predictions_per_seq,
):
label_id = flow.reshape(masked_lm_labels, [-1])
# The `positions` tensor might be zero-padded (if the sequence is too
# short to have the maximum number of predictions). The `label_weights`
# tensor has a value of 1.0 for every real prediction and 0.0 for the
# padding predictions.
pre_example_loss = mlm_criterion(logit, label_id)
pre_example_loss = flow.reshape(pre_example_loss, [-1, max_predictions_per_seq])
numerator = flow.sum(pre_example_loss * label_weights)
denominator = flow.sum(label_weights) + 1e-5
loss = numerator / denominator
return loss
class BertGraph(nn.Graph):
def __init__(self):
super().__init__()
self.bert = bert_model
self.ns_criterion = ns_criterion
self.masked_lm_criterion = partial(
get_masked_lm_loss, max_predictions_per_seq=args.max_predictions_per_seq
)
self.add_optimizer(optimizer, lr_sch=lr_scheduler)
self._train_data_loader = train_data_loader
if args.grad_acc_steps > 1:
self.config.set_gradient_accumulation_steps(args.grad_acc_steps)
if args.use_fp16:
self.config.enable_amp(True)
grad_scaler = flow.amp.GradScaler(
init_scale=2 ** 30,
growth_factor=2.0,
backoff_factor=0.5,
growth_interval=2000,
)
self.set_grad_scaler(grad_scaler)
self.config.allow_fuse_add_to_output(True)
self.config.allow_fuse_model_update_ops(True)
def build(self):
(
input_ids,
next_sentence_labels,
input_mask,
segment_ids,
masked_lm_ids,
masked_lm_positions,
masked_lm_weights,
) = self._train_data_loader()
input_ids = input_ids.to(device=device)
input_mask = input_mask.to(device=device)
segment_ids = segment_ids.to(device=device)
next_sentence_labels = next_sentence_labels.to(device=device)
masked_lm_ids = masked_lm_ids.to(device=device)
masked_lm_positions = masked_lm_positions.to(device=device)
masked_lm_weights = masked_lm_weights.to(device=device)
# 1. forward the next_sentence_prediction and masked_lm model
prediction_scores, seq_relationship_scores = self.bert(
input_ids, segment_ids, input_mask, masked_lm_positions
)
# 2-1. loss of is_next classification result
next_sentence_loss = self.ns_criterion(
seq_relationship_scores.reshape(-1, 2), next_sentence_labels.reshape(-1)
)
masked_lm_loss = self.masked_lm_criterion(
prediction_scores, masked_lm_ids, masked_lm_weights
)
total_loss = masked_lm_loss + next_sentence_loss
total_loss.backward()
return (
seq_relationship_scores,
next_sentence_labels,
total_loss,
masked_lm_loss,
next_sentence_loss,
)
bert_graph = BertGraph()
class BertEvalGraph(nn.Graph):
def __init__(self):
super().__init__()
self.bert = bert_model
self._test_data_loader = test_data_loader
self.config.allow_fuse_add_to_output(True)
def build(self):
(
input_ids,
next_sent_labels,
input_masks,
segment_ids,
masked_lm_ids,
masked_lm_positions,
masked_lm_weights,
) = self._test_data_loader()
input_ids = input_ids.to(device=device)
input_masks = input_masks.to(device=device)
segment_ids = segment_ids.to(device=device)
next_sent_labels = next_sent_labels.to(device=device)
masked_lm_ids = masked_lm_ids.to(device=device)
masked_lm_positions = masked_lm_positions.to(device)
with flow.no_grad():
# 1. forward the next_sentence_prediction and masked_lm model
_, seq_relationship_scores = self.bert(
input_ids, input_masks, segment_ids
)
return seq_relationship_scores, next_sent_labels
bert_eval_graph = BertEvalGraph()
train_total_losses = []
for epoch in range(args.epochs):
metric = Metric(
desc="bert pretrain",
print_steps=args.loss_print_every_n_iters,
batch_size=args.train_global_batch_size * args.grad_acc_steps,
keys=["total_loss", "mlm_loss", "nsp_loss", "pred_acc"],
)
# Train
bert_model.train()
for step in range(len(train_data_loader)):
bert_outputs = pretrain(bert_graph, args.metric_local)
if flow.env.get_rank() == 0:
metric.metric_cb(step, epoch=epoch)(bert_outputs)
train_total_losses.append(bert_outputs["total_loss"])
# Eval
bert_model.eval()
val_acc = validation(
epoch,
len(test_data_loader),
bert_eval_graph,
args.val_print_every_n_iters,
args.metric_local,
)
save_model(bert_model, args.checkpoint_path, epoch, val_acc, args.use_consistent)
def main():
args = get_config()
if args.with_cuda:
device = flow.device("cuda")
else:
device = flow.device("cpu")
print("Creating Dataloader")
train_data_loader = OfRecordDataLoader(
ofrecord_dir=args.ofrecord_path,
mode="train",
dataset_size=args.train_dataset_size,
batch_size=args.train_batch_size,
data_part_num=args.train_data_part,
seq_length=args.seq_length,
max_predictions_per_seq=args.max_predictions_per_seq,
consistent=False,
)
test_data_loader = OfRecordDataLoader(
ofrecord_dir=args.ofrecord_path,
mode="test",
dataset_size=1024,
batch_size=args.val_batch_size,
data_part_num=4,
seq_length=args.seq_length,
max_predictions_per_seq=args.max_predictions_per_seq,
consistent=False,
)
print("Building BERT Model")
hidden_size = 64 * args.num_attention_heads
intermediate_size = 4 * hidden_size
bert_model = BertForPreTraining(
args.vocab_size,
args.seq_length,
hidden_size,
args.num_hidden_layers,
args.num_attention_heads,
intermediate_size,
nn.GELU(),
args.hidden_dropout_prob,
args.attention_probs_dropout_prob,
args.max_position_embeddings,
args.type_vocab_size,
)
# Load the same initial parameters with lazy model.
# from utils.compare_lazy_outputs import load_params_from_lazy
# load_params_from_lazy(
# bert_model.state_dict(),
# "../../OneFlow-Benchmark/LanguageModeling/BERT/initial_model",
# )
bert_model = bert_model.to(device)
if args.use_ddp:
bert_model = ddp(bert_model)
optimizer = build_optimizer(
args.optim_name,
bert_model,
args.lr,
args.weight_decay,
weight_decay_excludes=["bias", "LayerNorm", "layer_norm"],
clip_grad_max_norm=1,
clip_grad_norm_type=2.0,
)
steps = args.epochs * len(train_data_loader)
warmup_steps = int(steps * args.warmup_proportion)
lr_scheduler = PolynomialLR(optimizer, steps=steps, end_learning_rate=0.0)
lr_scheduler = flow.optim.lr_scheduler.WarmUpLR(lr_scheduler,
warmup_factor=0,
warmup_iters=warmup_steps,
warmup_method="linear")
ns_criterion = nn.CrossEntropyLoss(reduction="mean")
mlm_criterion = nn.CrossEntropyLoss(reduction="none")
def get_masked_lm_loss(
logit_blob,
masked_lm_positions,
masked_lm_labels,
label_weights,
max_prediction_per_seq,
):
# gather valid position indices
logit_blob = flow.gather(
logit_blob,
index=masked_lm_positions.unsqueeze(2).repeat(
1, 1, args.vocab_size),
dim=1,
)
logit_blob = flow.reshape(logit_blob, [-1, args.vocab_size])
label_id_blob = flow.reshape(masked_lm_labels, [-1])
# The `positions` tensor might be zero-padded (if the sequence is too
# short to have the maximum number of predictions). The `label_weights`
# tensor has a value of 1.0 for every real prediction and 0.0 for the
# padding predictions.
pre_example_loss = mlm_criterion(logit_blob, label_id_blob)
pre_example_loss = flow.reshape(pre_example_loss,
[-1, max_prediction_per_seq])
numerator = flow.sum(pre_example_loss * label_weights)
denominator = flow.sum(label_weights) + 1e-5
loss = numerator / denominator
return loss
train_total_losses = []
for epoch in range(args.epochs):
metric = Metric(
desc="bert pretrain",
print_steps=args.loss_print_every_n_iters,
batch_size=args.train_batch_size,
keys=["total_loss", "mlm_loss", "nsp_loss", "pred_acc"],
)
# Train
bert_model.train()
for step in range(len(train_data_loader)):
bert_outputs = pretrain(
train_data_loader,
bert_model,
ns_criterion,
partial(
get_masked_lm_loss,
max_prediction_per_seq=args.max_predictions_per_seq,
),
optimizer,
lr_scheduler,
)
if flow.env.get_rank() == 0:
metric.metric_cb(step, epoch=epoch)(bert_outputs)
train_total_losses.append(bert_outputs["total_loss"])
# Eval
bert_model.eval()
val_acc = validation(epoch, test_data_loader, bert_model,
args.val_print_every_n_iters)
save_model(bert_model, args.checkpoint_path, epoch, val_acc, False)
def main():
hidden_size = 64 * args.num_attention_heads # H = 64, size per head
intermediate_size = hidden_size * 4
print("Create Bert model for SQuAD")
squad_model = SQuAD(
args.vocab_size,
seq_length=args.seq_length,
hidden_size=hidden_size,
hidden_layers=args.num_hidden_layers,
atten_heads=args.num_attention_heads,
intermediate_size=intermediate_size,
hidden_act=nn.GELU(),
hidden_dropout_prob=args.hidden_dropout_prob,
attention_probs_dropout_prob=args.attention_probs_dropout_prob,
max_position_embeddings=args.max_position_embeddings,
type_vocab_size=args.type_vocab_size,
initializer_range=0.02,
)
# Load pretrain model from lazy trained model
load_params_from_lazy(squad_model.state_dict(), args.model_load_dir)
squad_model.to(device)
if args.do_train:
print("Create SQuAD training data decoders")
train_decoders = SquadDecoder(
args.train_data_dir, batch_size, args.train_data_part_num, args.seq_length
)
optimizer = build_adamW_optimizer(
squad_model,
args.learning_rate,
args.weight_decay_rate,
weight_decay_excludes=["bias", "LayerNorm", "layer_norm"],
)
lr_scheduler = PolynomialLR(
optimizer, steps=args.iter_num, end_learning_rate=0.0
)
warmup_batches = int(args.iter_num * args.warmup_proportion)
lr_scheduler = flow.optim.lr_scheduler.WarmUpLR(
lr_scheduler,
warmup_factor=0,
warmup_iters=warmup_batches,
warmup_method="linear",
)
class SQuADGraph(nn.Graph):
def __init__(self):
super().__init__()
self.squad_model = squad_model
self.criterion = nn.CrossEntropyLoss()
self.add_optimizer(optimizer, lr_sch=lr_scheduler)
self._decoders = train_decoders
if args.use_fp16:
self.config.enable_amp(True)
grad_scaler = flow.amp.GradScaler(
init_scale=2 ** 30,
growth_factor=2.0,
backoff_factor=0.5,
growth_interval=2000,
)
self.set_grad_scaler(grad_scaler)
def build(self):
(
input_ids,
input_mask,
segment_ids,
start_positions,
end_positions,
) = self._decoders()
input_ids = input_ids.to(device=device)
input_mask = input_mask.to(device=device)
segment_ids = segment_ids.to(device=device)
start_positions = start_positions.to(device=device)
end_positions = end_positions.to(device=device)
start_logits, end_logits = self.squad_model(
input_ids, segment_ids, input_mask
)
start_logits = flow.reshape(start_logits, [-1, args.seq_length])
end_logits = flow.reshape(end_logits, [-1, args.seq_length])
start_loss = self.criterion(start_logits, start_positions.squeeze(1))
end_loss = self.criterion(end_logits, end_positions.squeeze(1))
total_loss = (start_loss + end_loss) * 0.5
total_loss.backward()
return total_loss
squad_graph = SQuADGraph()
for epoch in range(args.num_epochs):
squad_model.train()
metric = Metric(
desc="train",
print_steps=args.loss_print_every_n_iter,
batch_size=batch_size,
keys=["total_loss"],
)
for step in range(epoch_size):
metric.metric_cb(step, epoch=epoch)(squad_finetune(squad_graph))
if args.save_last_snapshot:
save_model(squad_model, args.model_save_dir, "last_snapshot")
if args.do_eval:
assert os.path.isdir(args.eval_data_dir)
print("Create SQuAD testing data decoders")
test_decoders = SquadDecoder(
args.eval_data_dir,
eval_batch_size,
args.eval_data_part_num,
args.seq_length,
is_train=False,
)
squad_model.eval()
class SQuADEvalGraph(nn.Graph):
def __init__(self):
super().__init__()
self.squad_model = squad_model
self._decoders = test_decoders
def build(self):
(input_ids, input_mask, segment_ids, unique_ids) = self._decoders()
input_ids = input_ids.to(device=device)
input_mask = input_mask.to(device=device)
segment_ids = segment_ids.to(device=device)
unique_ids = unique_ids.to(device=device)
with flow.no_grad():
start_logits, end_logits = self.squad_model(
input_ids, segment_ids, input_mask
)
return unique_ids, start_logits, end_logits
squad_eval_graph = SQuADEvalGraph()
squad_eval(num_eval_steps, squad_eval_graph, args.loss_print_every_n_iter)