class EmmentalLearner(object):
"""A class for emmental multi-task learning.
"""
def __init__(self, name=None):
self.name = name if name is not None else type(self).__name__
def _set_logging_manager(self):
"""Set logging manager."""
self.logging_manager = LoggingManager(self.n_batches_per_epoch)
def _set_optimizer(self, model):
"""Set optimizer for learning process."""
# TODO: add more optimizer support and fp16
optimizer_config = Meta.config["learner_config"]["optimizer_config"]
opt = optimizer_config["optimizer"]
parameters = filter(lambda p: p.requires_grad, model.parameters())
if opt == "sgd":
optimizer = optim.SGD(
parameters,
lr=optimizer_config["lr"],
**optimizer_config["sgd_config"],
weight_decay=optimizer_config["l2"],
)
elif opt == "adam":
optimizer = optim.Adam(
parameters,
lr=optimizer_config["lr"],
**optimizer_config["adam_config"],
weight_decay=optimizer_config["l2"],
)
elif opt == "adamax":
optimizer = optim.Adamax(
parameters,
lr=optimizer_config["lr"],
**optimizer_config["adamax_config"],
weight_decay=optimizer_config["l2"],
)
elif opt == "bert_adam":
optimizer = BertAdam(
parameters,
lr=optimizer_config["lr"],
**optimizer_config["bert_adam_config"],
weight_decay=optimizer_config["l2"],
)
else:
raise ValueError(f"Unrecognized optimizer option '{opt}'")
logger.info(f"Using optimizer {optimizer}")
self.optimizer = optimizer
def _set_lr_scheduler(self, model):
"""Set learning rate scheduler for learning process."""
# Set warmup scheduler
self._set_warmup_scheduler(model)
# Set lr scheduler
# TODO: add more lr scheduler support
opt = Meta.config["learner_config"]["lr_scheduler_config"][
"lr_scheduler"]
lr_scheduler_config = Meta.config["learner_config"][
"lr_scheduler_config"]
if opt is None:
lr_scheduler = None
elif opt == "linear":
total_steps = (self.n_batches_per_epoch *
Meta.config["learner_config"]["n_epochs"])
linear_decay_func = lambda x: (total_steps - self.warmup_steps - x
) / (total_steps - self.warmup_steps
)
lr_scheduler = optim.lr_scheduler.LambdaLR(self.optimizer,
linear_decay_func)
elif opt == "exponential":
lr_scheduler = optim.lr_scheduler.ExponentialLR(
self.optimizer, **lr_scheduler_config["exponential_config"])
elif opt == "step":
lr_scheduler = optim.lr_scheduler.StepLR(
self.optimizer, **lr_scheduler_config["step_config"])
elif opt == "multi_step":
lr_scheduler = optim.lr_scheduler.MultiStepLR(
self.optimizer, **lr_scheduler_config["multi_step_config"])
# elif opt == "reduce_on_plateau":
# lr_scheduler = optim.lr_scheduler.ReduceLROnPlateau(
# self.optimizer,
# min_lr=lr_scheduler_config["min_lr"],
# **lr_scheduler_config["plateau_config"],
# )
else:
raise ValueError(f"Unrecognized lr scheduler option '{opt}'")
self.lr_scheduler = lr_scheduler
def _set_warmup_scheduler(self, model):
"""Set warmup learning rate scheduler for learning process."""
if Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_steps"]:
warmup_steps = Meta.config["learner_config"][
"lr_scheduler_config"]["warmup_steps"]
if warmup_steps < 0:
raise ValueError(f"warmup_steps much greater or equal than 0.")
warmup_unit = Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_unit"]
if warmup_unit == "epoch":
self.warmup_steps = int(warmup_steps *
self.n_batches_per_epoch)
elif warmup_unit == "batch":
self.warmup_steps = int(warmup_steps)
else:
raise ValueError(
f"warmup_unit must be 'batch' or 'epoch', but {warmup_unit} found."
)
linear_warmup_func = lambda x: x / self.warmup_steps
warmup_scheduler = optim.lr_scheduler.LambdaLR(
self.optimizer, linear_warmup_func)
logger.info(f"Warmup {self.warmup_steps} batchs.")
elif Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_percentage"]:
warmup_percentage = Meta.config["learner_config"][
"lr_scheduler_config"]["warmup_percentage"]
self.warmup_steps = int(warmup_percentage *
Meta.config["learner_config"]["n_epochs"] *
self.n_batches_per_epoch)
linear_warmup_func = lambda x: x / self.warmup_steps
warmup_scheduler = optim.lr_scheduler.LambdaLR(
self.optimizer, linear_warmup_func)
logger.info(f"Warmup {self.warmup_steps} batchs.")
else:
warmup_scheduler = None
self.warmup_steps = 0
self.warmup_scheduler = warmup_scheduler
def _update_lr_scheduler(self, model, step):
"""Update the lr using lr_scheduler with each batch."""
if self.warmup_scheduler and step < self.warmup_steps:
self.warmup_scheduler.step()
elif self.lr_scheduler is not None:
self.lr_scheduler.step()
min_lr = Meta.config["learner_config"]["lr_scheduler_config"][
"min_lr"]
if min_lr and self.optimizer.param_groups[0]["lr"] < min_lr:
self.optimizer.param_groups[0]["lr"] = min_lr
def _set_task_scheduler(self, model, dataloaders):
"""Set task scheduler for learning process"""
# TODO: add more task scheduler support
opt = Meta.config["learner_config"]["task_scheduler"]
if opt == "sequential":
self.task_scheduler = SequentialScheduler()
elif opt == "round_robin":
self.task_scheduler = RoundRobinScheduler()
else:
raise ValueError(f"Unrecognized task scheduler option '{opt}'")
def _evaluate(self, model, dataloaders, split):
if not isinstance(split, list):
valid_split = [split]
else:
valid_split = split
valid_dataloaders = [
dataloader for dataloader in dataloaders
if dataloader.split in valid_split
]
return model.score(valid_dataloaders)
def _logging(self, model, dataloaders, batch_size):
"""Checking if it's time to evaluting or checkpointing"""
# Switch to eval mode for evaluation
model.eval()
metric_dict = dict()
self.logging_manager.update(batch_size)
# Log the loss and lr
metric_dict.update(self._aggregate_losses())
# Evaluate the model and log the metric
if self.logging_manager.trigger_evaluation():
# Log task specific metric
metric_dict.update(
self._evaluate(model, dataloaders,
Meta.config["learner_config"]["valid_split"]))
self.logging_manager.write_log(metric_dict)
self._reset_losses()
# Checkpoint the model
if self.logging_manager.trigger_checkpointing():
self.logging_manager.checkpoint_model(model, self.optimizer,
self.lr_scheduler,
metric_dict)
self.logging_manager.write_log(metric_dict)
self._reset_losses()
# Switch to train mode
model.train()
return metric_dict
def _aggregate_losses(self):
"""Calculate the task specific loss, average micro loss and learning rate."""
metric_dict = dict()
# Log task specific loss
for identifier in self.running_losses.keys():
if self.running_counts[identifier] > 0:
metric_dict[identifier] = (self.running_losses[identifier] /
self.running_counts[identifier])
# Calculate average micro loss
total_loss = sum(self.running_losses.values())
total_count = sum(self.running_counts.values())
if total_count > 0:
metric_dict["model/train/all/loss"] = total_loss / total_count
# Log the learning rate
metric_dict["model/train/all/lr"] = self.optimizer.param_groups[0][
"lr"]
return metric_dict
def _reset_losses(self):
self.running_losses = defaultdict(float)
self.running_counts = defaultdict(int)
def learn(self, model, dataloaders):
"""The learning procedure of emmental MTL
:param model: The emmental model that needs to learn
:type model: emmental.model
:param dataloaders: a list of dataloaders used to learn the model
:type dataloaders: list
"""
# Generate the list of dataloaders for learning process
train_split = Meta.config["learner_config"]["train_split"]
if isinstance(train_split, str):
train_split = [train_split]
train_dataloaders = [
dataloader for dataloader in dataloaders
if dataloader.split in train_split
]
if not train_dataloaders:
raise ValueError(
f"Cannot find the specified train_split "
f'{Meta.config["learner_config"]["train_split"]} in dataloaders.'
)
# Calculate the total number of batches per epoch
self.n_batches_per_epoch = sum(
[len(dataloader) for dataloader in train_dataloaders])
# Set up logging manager
self._set_logging_manager()
# Set up optimizer
self._set_optimizer(model)
# Set up lr_scheduler
self._set_lr_scheduler(model)
# Set up task_scheduler
self._set_task_scheduler(model, dataloaders)
# Set to training mode
model.train()
logger.info(f"Start learning...")
self.metrics = dict()
self._reset_losses()
for epoch_num in range(Meta.config["learner_config"]["n_epochs"]):
batches = tqdm(
enumerate(self.task_scheduler.get_batches(train_dataloaders)),
total=self.n_batches_per_epoch,
disable=(not Meta.config["meta_config"]["verbose"]),
desc=f"Epoch {epoch_num}:",
)
for batch_num, (batch, task_to_label_dict, data_name,
split) in batches:
X_dict, Y_dict = batch
total_batch_num = epoch_num * self.n_batches_per_epoch + batch_num
batch_size = len(next(iter(Y_dict.values())))
# Update lr using lr scheduler
self._update_lr_scheduler(model, total_batch_num)
# Set gradients of all model parameters to zero
self.optimizer.zero_grad()
# Perform forward pass and calcualte the loss and count
loss_dict, count_dict = model.calculate_loss(
X_dict, Y_dict, task_to_label_dict, data_name, split)
# Update running loss and count
for identifier in loss_dict.keys():
self.running_losses[identifier] += (
loss_dict[identifier].item() * count_dict[identifier])
self.running_counts[identifier] += count_dict[identifier]
# Skip the backward pass if no loss is calcuated
if not loss_dict:
continue
# Calculate the average loss
loss = sum(loss_dict.values())
# Perform backward pass to calculate gradients
loss.backward()
# Clip gradient norm
if Meta.config["learner_config"]["optimizer_config"][
"grad_clip"]:
torch.nn.utils.clip_grad_norm_(
model.parameters(),
Meta.config["learner_config"]["optimizer_config"]
["grad_clip"],
)
# Update the parameters
self.optimizer.step()
self.metrics.update(
self._logging(model, dataloaders, batch_size))
batches.set_postfix(self.metrics)
model = self.logging_manager.close(model)
class EmmentalLearner(object):
r"""A class for emmental multi-task learning.
Args:
name(str, optional): Name of the learner, defaults to None.
"""
def __init__(self, name: Optional[str] = None) -> None:
self.name = name if name is not None else type(self).__name__
def _set_logging_manager(self) -> None:
r"""Set logging manager."""
self.logging_manager = LoggingManager(self.n_batches_per_epoch)
def _set_optimizer(self, model: EmmentalModel) -> None:
r"""Set optimizer for learning process.
Args:
model(EmmentalModel): The model to set up the optimizer.
"""
optimizer_config = Meta.config["learner_config"]["optimizer_config"]
opt = optimizer_config["optimizer"]
parameters = filter(lambda p: p.requires_grad, model.parameters())
optim_dict = {
# PyTorch optimizer
"asgd": optim.ASGD, # type: ignore
"adadelta": optim.Adadelta, # type: ignore
"adagrad": optim.Adagrad, # type: ignore
"adam": optim.Adam, # type: ignore
"adamw": optim.AdamW, # type: ignore
"adamax": optim.Adamax, # type: ignore
"lbfgs": optim.LBFGS, # type: ignore
"rms_prop": optim.RMSprop, # type: ignore
"r_prop": optim.Rprop, # type: ignore
"sgd": optim.SGD, # type: ignore
"sparse_adam": optim.SparseAdam, # type: ignore
# Customize optimizer
"bert_adam": BertAdam,
}
if opt in ["lbfgs", "r_prop", "sparse_adam"]:
optimizer = optim_dict[opt](
parameters,
lr=optimizer_config["lr"],
**optimizer_config[f"{opt}_config"],
)
elif opt in optim_dict.keys():
optimizer = optim_dict[opt](
parameters,
lr=optimizer_config["lr"],
weight_decay=optimizer_config["l2"],
**optimizer_config[f"{opt}_config"],
)
elif isinstance(opt, optim.Optimizer): # type: ignore
optimizer = opt(parameters)
else:
raise ValueError(f"Unrecognized optimizer option '{opt}'")
self.optimizer = optimizer
if Meta.config["meta_config"]["verbose"]:
logger.info(f"Using optimizer {self.optimizer}")
def _set_lr_scheduler(self, model: EmmentalModel) -> None:
r"""Set learning rate scheduler for learning process.
Args:
model(EmmentalModel): The model to set up lr scheduler.
"""
# Set warmup scheduler
self._set_warmup_scheduler(model)
# Set lr scheduler
lr_scheduler_dict = {
"exponential": optim.lr_scheduler.ExponentialLR,
"plateau": optim.lr_scheduler.ReduceLROnPlateau,
"step": optim.lr_scheduler.StepLR,
"multi_step": optim.lr_scheduler.MultiStepLR,
"cyclic": optim.lr_scheduler.CyclicLR,
"one_cycle": optim.lr_scheduler.OneCycleLR, # type: ignore
"cosine_annealing": optim.lr_scheduler.CosineAnnealingLR,
}
opt = Meta.config["learner_config"]["lr_scheduler_config"]["lr_scheduler"]
lr_scheduler_config = Meta.config["learner_config"]["lr_scheduler_config"]
if opt is None:
lr_scheduler = None
elif opt == "linear":
total_steps = (
self.n_batches_per_epoch * Meta.config["learner_config"]["n_epochs"]
)
linear_decay_func = lambda x: (total_steps - self.warmup_steps - x) / (
total_steps - self.warmup_steps
)
lr_scheduler = optim.lr_scheduler.LambdaLR(
self.optimizer, linear_decay_func # type: ignore
)
elif opt in ["exponential", "step", "multi_step", "cyclic"]:
lr_scheduler = lr_scheduler_dict[opt]( # type: ignore
self.optimizer, **lr_scheduler_config[f"{opt}_config"]
)
elif opt == "one_cycle":
total_steps = (
self.n_batches_per_epoch * Meta.config["learner_config"]["n_epochs"]
)
lr_scheduler = lr_scheduler_dict[opt]( # type: ignore
self.optimizer,
total_steps=total_steps,
epochs=Meta.config["learner_config"]["n_epochs"],
steps_per_epoch=self.n_batches_per_epoch,
**lr_scheduler_config[f"{opt}_config"],
)
elif opt == "cosine_annealing":
total_steps = (
self.n_batches_per_epoch * Meta.config["learner_config"]["n_epochs"]
)
lr_scheduler = lr_scheduler_dict[opt]( # type: ignore
self.optimizer,
total_steps,
eta_min=lr_scheduler_config["min_lr"],
**lr_scheduler_config[f"{opt}_config"],
)
elif opt == "plateau":
plateau_config = copy.deepcopy(lr_scheduler_config["plateau_config"])
del plateau_config["metric"]
lr_scheduler = lr_scheduler_dict[opt](
self.optimizer,
verbose=Meta.config["meta_config"]["verbose"],
min_lr=lr_scheduler_config["min_lr"],
**plateau_config,
)
elif isinstance(opt, _LRScheduler):
lr_scheduler = opt(self.optimizer) # type: ignore
else:
raise ValueError(f"Unrecognized lr scheduler option '{opt}'")
self.lr_scheduler = lr_scheduler
self.lr_scheduler_step_unit = Meta.config["learner_config"][
"lr_scheduler_config"
]["lr_scheduler_step_unit"]
self.lr_scheduler_step_freq = Meta.config["learner_config"][
"lr_scheduler_config"
]["lr_scheduler_step_freq"]
if Meta.config["meta_config"]["verbose"]:
logger.info(
f"Using lr_scheduler {repr(self.lr_scheduler)} with step every "
f"{self.lr_scheduler_step_freq} {self.lr_scheduler_step_unit}."
)
def _set_warmup_scheduler(self, model: EmmentalModel) -> None:
r"""Set warmup learning rate scheduler for learning process.
Args:
model(EmmentalModel): The model to set up warmup scheduler.
"""
self.warmup_steps = 0
if Meta.config["learner_config"]["lr_scheduler_config"]["warmup_steps"]:
warmup_steps = Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_steps"
]
if warmup_steps < 0:
raise ValueError(f"warmup_steps much greater or equal than 0.")
warmup_unit = Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_unit"
]
if warmup_unit == "epoch":
self.warmup_steps = int(warmup_steps * self.n_batches_per_epoch)
elif warmup_unit == "batch":
self.warmup_steps = int(warmup_steps)
else:
raise ValueError(
f"warmup_unit must be 'batch' or 'epoch', but {warmup_unit} found."
)
linear_warmup_func = lambda x: x / self.warmup_steps
warmup_scheduler = optim.lr_scheduler.LambdaLR(
self.optimizer, linear_warmup_func # type: ignore
)
if Meta.config["meta_config"]["verbose"]:
logger.info(f"Warmup {self.warmup_steps} batchs.")
elif Meta.config["learner_config"]["lr_scheduler_config"]["warmup_percentage"]:
warmup_percentage = Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_percentage"
]
self.warmup_steps = int(
warmup_percentage
* Meta.config["learner_config"]["n_epochs"]
* self.n_batches_per_epoch
)
linear_warmup_func = lambda x: x / self.warmup_steps
warmup_scheduler = optim.lr_scheduler.LambdaLR(
self.optimizer, linear_warmup_func # type: ignore
)
if Meta.config["meta_config"]["verbose"]:
logger.info(f"Warmup {self.warmup_steps} batchs.")
else:
warmup_scheduler = None
self.warmup_scheduler = warmup_scheduler
def _update_lr_scheduler(
self, model: EmmentalModel, step: int, metric_dict: Dict[str, float]
) -> None:
r"""Update the lr using lr_scheduler with each batch.
Args:
model(EmmentalModel): The model to update lr scheduler.
step(int): The current step.
"""
cur_lr = self.optimizer.param_groups[0]["lr"]
if self.warmup_scheduler and step < self.warmup_steps:
self.warmup_scheduler.step() # type: ignore
elif self.lr_scheduler is not None:
lr_step_cnt = (
self.lr_scheduler_step_freq
if self.lr_scheduler_step_unit == "batch"
else self.lr_scheduler_step_freq * self.n_batches_per_epoch
)
if (step + 1) % lr_step_cnt == 0:
if (
Meta.config["learner_config"]["lr_scheduler_config"]["lr_scheduler"]
!= "plateau"
):
self.lr_scheduler.step() # type: ignore
elif (
Meta.config["learner_config"]["lr_scheduler_config"][
"plateau_config"
]["metric"]
in metric_dict
):
self.lr_scheduler.step(
metric_dict[ # type: ignore
Meta.config["learner_config"]["lr_scheduler_config"][
"plateau_config"
]["metric"]
]
)
min_lr = Meta.config["learner_config"]["lr_scheduler_config"]["min_lr"]
if min_lr and self.optimizer.param_groups[0]["lr"] < min_lr:
self.optimizer.param_groups[0]["lr"] = min_lr
if (
Meta.config["learner_config"]["lr_scheduler_config"]["reset_state"]
and cur_lr != self.optimizer.param_groups[0]["lr"]
):
logger.info("Reset the state of the optimizer.")
self.optimizer.state = collections.defaultdict(dict) # Reset state
def _set_task_scheduler(self) -> None:
r"""Set task scheduler for learning process"""
opt = Meta.config["learner_config"]["task_scheduler_config"]["task_scheduler"]
if opt in ["sequential", "round_robin", "mixed"]:
self.task_scheduler = SCHEDULERS[opt]( # type: ignore
**Meta.config["learner_config"]["task_scheduler_config"][
f"{opt}_scheduler_config"
]
)
elif isinstance(opt, Scheduler):
self.task_scheduler = opt
else:
raise ValueError(f"Unrecognized task scheduler option '{opt}'")
def _evaluate(
self,
model: EmmentalModel,
dataloaders: List[EmmentalDataLoader],
split: Union[List[str], str],
) -> Dict[str, float]:
r"""Evaluate the model.
Args:
model(EmmentalModel): The model to evaluate.
dataloaders(List[EmmentalDataLoader]): The data to evaluate.
split(str): The split to evaluate.
Returns:
dict: The score dict.
"""
if not isinstance(split, list):
valid_split = [split]
else:
valid_split = split
valid_dataloaders = [
dataloader for dataloader in dataloaders if dataloader.split in valid_split
]
return model.score(valid_dataloaders)
def _logging(
self,
model: EmmentalModel,
dataloaders: List[EmmentalDataLoader],
batch_size: int,
) -> Dict[str, float]:
r"""Checking if it's time to evaluting or checkpointing.
Args:
model(EmmentalModel): The model to log.
dataloaders(List[EmmentalDataLoader]): The data to evaluate.
batch_size(int): Batch size.
Returns:
dict: The score dict.
"""
# Switch to eval mode for evaluation
model.eval()
metric_dict = dict()
self.logging_manager.update(batch_size)
# Log the loss and lr
metric_dict.update(self._aggregate_running_metrics(model))
# Evaluate the model and log the metric
trigger_evaluation = self.logging_manager.trigger_evaluation()
if trigger_evaluation:
# Log task specific metric
metric_dict.update(
self._evaluate(
model, dataloaders, Meta.config["learner_config"]["valid_split"]
)
)
self.logging_manager.write_log(metric_dict)
self._reset_losses()
# Log metric dict every trigger evaluation time or full epoch
if Meta.config["meta_config"]["verbose"] and (
trigger_evaluation
or self.logging_manager.epoch_total == int(self.logging_manager.epoch_total)
):
logger.info(
f"{self.logging_manager.counter_unit.capitalize()}: "
f"{self.logging_manager.unit_total:.2f} {metric_dict}"
)
# Checkpoint the model
if self.logging_manager.trigger_checkpointing():
self.logging_manager.checkpoint_model(
model, self.optimizer, self.lr_scheduler, metric_dict
)
self.logging_manager.write_log(metric_dict)
self._reset_losses()
# Switch to train mode
model.train()
return metric_dict
def _aggregate_running_metrics(self, model: EmmentalModel) -> Dict[str, float]:
r"""Calculate the running overall and task specific metrics.
Args:
model(EmmentalModel): The model to evaluate.
Returns:
dict: The score dict.
"""
metric_dict = dict()
total_count = 0
# Log task specific loss
for identifier in self.running_uids.keys():
count = len(self.running_uids[identifier])
if count > 0:
metric_dict[identifier + "/loss"] = (
self.running_losses[identifier] / count
)
total_count += count
# Calculate average micro loss
if total_count > 0:
total_loss = sum(self.running_losses.values())
metric_dict["model/all/train/loss"] = total_loss / total_count
micro_score_dict: Dict[str, List[ndarray]] = defaultdict(list)
macro_score_dict: Dict[str, List[ndarray]] = defaultdict(list)
# Calculate training metric
for identifier in self.running_uids.keys():
task_name, data_name, split = identifier.split("/")
metric_score = model.scorers[task_name].score(
self.running_golds[identifier],
self.running_probs[identifier],
prob_to_pred(self.running_probs[identifier]),
self.running_uids[identifier],
)
for metric_name, metric_value in metric_score.items():
metric_dict[f"{identifier}/{metric_name}"] = metric_value
# Collect average score
identifier = construct_identifier(task_name, data_name, split, "average")
metric_dict[identifier] = np.mean(list(metric_score.values()))
micro_score_dict[split].extend(list(metric_score.values()))
macro_score_dict[split].append(metric_dict[identifier])
# Collect split-wise micro/macro average score
for split in micro_score_dict.keys():
identifier = construct_identifier("model", "all", split, "micro_average")
metric_dict[identifier] = np.mean(micro_score_dict[split])
identifier = construct_identifier("model", "all", split, "macro_average")
metric_dict[identifier] = np.mean(macro_score_dict[split])
# Log the learning rate
metric_dict["model/all/train/lr"] = self.optimizer.param_groups[0]["lr"]
return metric_dict
def _reset_losses(self) -> None:
r"""Reset running logs."""
self.running_uids: Dict[str, List[str]] = defaultdict(list)
self.running_losses: Dict[str, ndarray] = defaultdict(float)
self.running_probs: Dict[str, List[ndarray]] = defaultdict(list)
self.running_golds: Dict[str, List[ndarray]] = defaultdict(list)
def learn(
self, model: EmmentalModel, dataloaders: List[EmmentalDataLoader]
) -> None:
r"""The learning procedure of emmental MTL.
Args:
model(EmmentalModel): The emmental model that needs to learn.
dataloaders(List[EmmentalDataLoader]): a list of dataloaders used to
learn the model.
"""
# Generate the list of dataloaders for learning process
train_split = Meta.config["learner_config"]["train_split"]
if isinstance(train_split, str):
train_split = [train_split]
train_dataloaders = [
dataloader for dataloader in dataloaders if dataloader.split in train_split
]
if not train_dataloaders:
raise ValueError(
f"Cannot find the specified train_split "
f'{Meta.config["learner_config"]["train_split"]} in dataloaders.'
)
# Set up task_scheduler
self._set_task_scheduler()
# Calculate the total number of batches per epoch
self.n_batches_per_epoch = self.task_scheduler.get_num_batches(
train_dataloaders
)
# Set up logging manager
self._set_logging_manager()
# Set up optimizer
self._set_optimizer(model)
# Set up lr_scheduler
self._set_lr_scheduler(model)
# Set to training mode
model.train()
if Meta.config["meta_config"]["verbose"]:
logger.info(f"Start learning...")
self.metrics: Dict[str, float] = dict()
self._reset_losses()
for epoch_num in range(Meta.config["learner_config"]["n_epochs"]):
batches = tqdm(
enumerate(self.task_scheduler.get_batches(train_dataloaders, model)),
total=self.n_batches_per_epoch,
disable=(not Meta.config["meta_config"]["verbose"]),
desc=f"Epoch {epoch_num}:",
)
for batch_num, batch in batches:
# Covert single batch into a batch list
if not isinstance(batch, list):
batch = [batch]
total_batch_num = epoch_num * self.n_batches_per_epoch + batch_num
batch_size = 0
# Set gradients of all model parameters to zero
self.optimizer.zero_grad()
for uids, X_dict, Y_dict, task_to_label_dict, data_name, split in batch:
batch_size += len(next(iter(Y_dict.values())))
# Perform forward pass and calcualte the loss and count
uid_dict, loss_dict, prob_dict, gold_dict = model(
uids, X_dict, Y_dict, task_to_label_dict
)
# Update running loss and count
for task_name in uid_dict.keys():
identifier = f"{task_name}/{data_name}/{split}"
self.running_uids[identifier].extend(uid_dict[task_name])
self.running_losses[identifier] += (
loss_dict[task_name].item() * len(uid_dict[task_name])
if len(loss_dict[task_name].size()) == 0
else torch.sum(loss_dict[task_name]).item()
)
self.running_probs[identifier].extend(prob_dict[task_name])
self.running_golds[identifier].extend(gold_dict[task_name])
# Skip the backward pass if no loss is calcuated
if not loss_dict:
continue
# Calculate the average loss
loss = sum(
[
model.weights[task_name] * task_loss
if len(task_loss.size()) == 0
else torch.mean(model.weights[task_name] * task_loss)
for task_name, task_loss in loss_dict.items()
]
)
# Perform backward pass to calculate gradients
loss.backward() # type: ignore
# Clip gradient norm
if Meta.config["learner_config"]["optimizer_config"]["grad_clip"]:
torch.nn.utils.clip_grad_norm_(
model.parameters(),
Meta.config["learner_config"]["optimizer_config"]["grad_clip"],
)
# Update the parameters
self.optimizer.step()
self.metrics.update(self._logging(model, dataloaders, batch_size))
batches.set_postfix(self.metrics)
# Update lr using lr scheduler
self._update_lr_scheduler(model, total_batch_num, self.metrics)
model = self.logging_manager.close(model)
class EmmentalLearner(object):
"""A class for emmental multi-task learning.
Args:
name: Name of the learner, defaults to None.
"""
def __init__(self, name: Optional[str] = None) -> None:
"""Initialize EmmentalLearner."""
self.name = name if name is not None else type(self).__name__
def _set_logging_manager(self) -> None:
"""Set logging manager."""
if Meta.config["learner_config"]["local_rank"] in [-1, 0]:
if self.use_step_base_counter:
self.logging_manager = LoggingManager(self.n_batches_per_epoch,
0, self.start_step)
else:
self.logging_manager = LoggingManager(
self.n_batches_per_epoch,
self.start_epoch,
self.start_epoch * self.n_batches_per_epoch,
)
def _set_optimizer(self, model: EmmentalModel) -> None:
"""Set optimizer for learning process.
Args:
model: The model to set up the optimizer.
"""
optimizer_config = Meta.config["learner_config"]["optimizer_config"]
opt = optimizer_config["optimizer"]
# If Meta.config["learner_config"]["optimizer_config"]["parameters"] is None,
# create a parameter group with all parameters in the model, else load user
# specified parameter groups.
if optimizer_config["parameters"] is None:
parameters = filter(lambda p: p.requires_grad, model.parameters())
else:
parameters = optimizer_config["parameters"](model)
optim_dict = {
# PyTorch optimizer
"asgd": optim.ASGD,
"adadelta": optim.Adadelta,
"adagrad": optim.Adagrad,
"adam": optim.Adam,
"adamw": optim.AdamW,
"adamax": optim.Adamax,
"lbfgs": optim.LBFGS,
"rms_prop": optim.RMSprop,
"r_prop": optim.Rprop,
"sgd": optim.SGD,
"sparse_adam": optim.SparseAdam,
# Customized optimizer
"bert_adam": BertAdam,
}
if opt in ["lbfgs", "r_prop", "sparse_adam"]:
optimizer = optim_dict[opt](
parameters,
lr=optimizer_config["lr"],
**optimizer_config[f"{opt}_config"],
)
elif opt in optim_dict.keys():
optimizer = optim_dict[opt](
parameters,
lr=optimizer_config["lr"],
weight_decay=optimizer_config["l2"],
**optimizer_config[f"{opt}_config"],
)
elif (isinstance(opt, type) and issubclass(opt, optim.Optimizer)) or (
isinstance(opt, partial)
and issubclass(opt.func, optim.Optimizer) # type: ignore
):
optimizer = opt(parameters) # type: ignore
else:
raise ValueError(f"Unrecognized optimizer option '{opt}'")
self.optimizer = optimizer
if Meta.config["meta_config"]["verbose"]:
logger.info(f"Using optimizer {self.optimizer}")
if Meta.config["learner_config"]["optimizer_path"]:
try:
self.optimizer.load_state_dict(
torch.load(
Meta.config["learner_config"]["optimizer_path"],
map_location=torch.device("cpu"),
)["optimizer"])
logger.info(
f"Optimizer state loaded from "
f"{Meta.config['learner_config']['optimizer_path']}")
except BaseException:
logger.error(
f"Loading failed... Cannot load optimizer state from "
f"{Meta.config['learner_config']['optimizer_path']}, "
f"continuing anyway.")
def _set_lr_scheduler(self, model: EmmentalModel) -> None:
"""Set learning rate scheduler for learning process.
Args:
model: The model to set up lr scheduler.
"""
# Set warmup scheduler
self._set_warmup_scheduler(model)
# Set lr scheduler
lr_scheduler_dict = {
"exponential": optim.lr_scheduler.ExponentialLR,
"plateau": optim.lr_scheduler.ReduceLROnPlateau,
"step": optim.lr_scheduler.StepLR,
"multi_step": optim.lr_scheduler.MultiStepLR,
"cyclic": optim.lr_scheduler.CyclicLR,
"one_cycle": optim.lr_scheduler.OneCycleLR, # type: ignore
"cosine_annealing": optim.lr_scheduler.CosineAnnealingLR,
}
opt = Meta.config["learner_config"]["lr_scheduler_config"][
"lr_scheduler"]
lr_scheduler_config = Meta.config["learner_config"][
"lr_scheduler_config"]
if opt is None:
lr_scheduler = None
elif opt == "linear":
linear_decay_func = lambda x: (self.total_steps - self.warmup_steps
- x) / (self.total_steps - self.
warmup_steps)
lr_scheduler = optim.lr_scheduler.LambdaLR(self.optimizer,
linear_decay_func)
elif opt in ["exponential", "step", "multi_step", "cyclic"]:
lr_scheduler = lr_scheduler_dict[opt](
self.optimizer, **lr_scheduler_config[f"{opt}_config"])
elif opt == "one_cycle":
lr_scheduler = lr_scheduler_dict[opt](
self.optimizer,
total_steps=self.total_steps,
epochs=Meta.config["learner_config"]["n_epochs"]
if not self.use_step_base_counter else 1,
steps_per_epoch=self.n_batches_per_epoch
if not self.use_step_base_counter else self.total_steps,
**lr_scheduler_config[f"{opt}_config"],
)
elif opt == "cosine_annealing":
lr_scheduler = lr_scheduler_dict[opt](
self.optimizer,
self.total_steps,
eta_min=lr_scheduler_config["min_lr"],
**lr_scheduler_config[f"{opt}_config"],
)
elif opt == "plateau":
plateau_config = copy.deepcopy(
lr_scheduler_config["plateau_config"])
del plateau_config["metric"]
lr_scheduler = lr_scheduler_dict[opt](
self.optimizer,
verbose=Meta.config["meta_config"]["verbose"],
min_lr=lr_scheduler_config["min_lr"],
**plateau_config,
)
elif isinstance(opt, _LRScheduler):
lr_scheduler = opt(self.optimizer) # type: ignore
else:
raise ValueError(f"Unrecognized lr scheduler option '{opt}'")
self.lr_scheduler = lr_scheduler
self.lr_scheduler_step_unit = Meta.config["learner_config"][
"lr_scheduler_config"]["lr_scheduler_step_unit"]
self.lr_scheduler_step_freq = Meta.config["learner_config"][
"lr_scheduler_config"]["lr_scheduler_step_freq"]
if Meta.config["meta_config"]["verbose"]:
logger.info(
f"Using lr_scheduler {repr(self.lr_scheduler)} with step every "
f"{self.lr_scheduler_step_freq} {self.lr_scheduler_step_unit}."
)
if Meta.config["learner_config"]["scheduler_path"]:
try:
scheduler_state = torch.load(
Meta.config["learner_config"]
["scheduler_path"])["lr_scheduler"]
if scheduler_state:
self.lr_scheduler.load_state_dict(scheduler_state)
logger.info(
f"Lr scheduler state loaded from "
f"{Meta.config['learner_config']['scheduler_path']}")
except BaseException:
logger.error(
f"Loading failed... Cannot load lr scheduler state from "
f"{Meta.config['learner_config']['scheduler_path']}, "
f"continuing anyway.")
def _set_warmup_scheduler(self, model: EmmentalModel) -> None:
"""Set warmup learning rate scheduler for learning process.
Args:
model: The model to set up warmup scheduler.
"""
self.warmup_steps = 0
if Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_steps"]:
warmup_steps = Meta.config["learner_config"][
"lr_scheduler_config"]["warmup_steps"]
if warmup_steps < 0:
raise ValueError("warmup_steps must greater than 0.")
warmup_unit = Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_unit"]
if warmup_unit == "epoch":
self.warmup_steps = int(warmup_steps *
self.n_batches_per_epoch)
elif warmup_unit == "batch":
self.warmup_steps = int(warmup_steps)
else:
raise ValueError(
f"warmup_unit must be 'batch' or 'epoch', but {warmup_unit} found."
)
linear_warmup_func = lambda x: x / self.warmup_steps
warmup_scheduler = optim.lr_scheduler.LambdaLR(
self.optimizer, linear_warmup_func)
if Meta.config["meta_config"]["verbose"]:
logger.info(f"Warmup {self.warmup_steps} batchs.")
elif Meta.config["learner_config"]["lr_scheduler_config"][
"warmup_percentage"]:
warmup_percentage = Meta.config["learner_config"][
"lr_scheduler_config"]["warmup_percentage"]
self.warmup_steps = math.ceil(warmup_percentage * self.total_steps)
linear_warmup_func = lambda x: x / self.warmup_steps
warmup_scheduler = optim.lr_scheduler.LambdaLR(
self.optimizer, linear_warmup_func)
if Meta.config["meta_config"]["verbose"]:
logger.info(f"Warmup {self.warmup_steps} batchs.")
else:
warmup_scheduler = None
self.warmup_scheduler = warmup_scheduler
def _update_lr_scheduler(self, model: EmmentalModel, step: int,
metric_dict: Dict[str, float]) -> None:
"""Update the lr using lr_scheduler with each batch.
Args:
model: The model to update lr scheduler.
step: The current step.
"""
cur_lr = self.optimizer.param_groups[0]["lr"]
if self.warmup_scheduler and step < self.warmup_steps:
self.warmup_scheduler.step()
elif self.lr_scheduler is not None:
lr_step_cnt = (self.lr_scheduler_step_freq
if self.lr_scheduler_step_unit == "batch" else
self.lr_scheduler_step_freq *
self.n_batches_per_epoch)
if (step + 1) % lr_step_cnt == 0:
if (Meta.config["learner_config"]["lr_scheduler_config"]
["lr_scheduler"] != "plateau"):
self.lr_scheduler.step()
elif (Meta.config["learner_config"]["lr_scheduler_config"]
["plateau_config"]["metric"] in metric_dict):
self.lr_scheduler.step(metric_dict[ # type: ignore
Meta.config["learner_config"]["lr_scheduler_config"]
["plateau_config"]["metric"]])
min_lr = Meta.config["learner_config"]["lr_scheduler_config"][
"min_lr"]
if min_lr and self.optimizer.param_groups[0]["lr"] < min_lr:
self.optimizer.param_groups[0]["lr"] = min_lr
if (Meta.config["learner_config"]["lr_scheduler_config"]["reset_state"]
and cur_lr != self.optimizer.param_groups[0]["lr"]):
logger.info("Reset the state of the optimizer.")
self.optimizer.state = collections.defaultdict(dict) # Reset state
def _set_task_scheduler(self) -> None:
"""Set task scheduler for learning process."""
opt = Meta.config["learner_config"]["task_scheduler_config"][
"task_scheduler"]
if opt in ["sequential", "round_robin", "mixed"]:
self.task_scheduler = SCHEDULERS[opt]( # type: ignore
**Meta.config["learner_config"]["task_scheduler_config"]
[f"{opt}_scheduler_config"])
elif isinstance(opt, Scheduler):
self.task_scheduler = opt
else:
raise ValueError(f"Unrecognized task scheduler option '{opt}'")
def _evaluate(
self,
model: EmmentalModel,
dataloaders: List[EmmentalDataLoader],
split: Union[List[str], str],
) -> Dict[str, float]:
"""Evaluate the model.
Args:
model: The model to evaluate.
dataloaders: The data to evaluate.
split: The split to evaluate.
Returns:
The score dict.
"""
if not isinstance(split, list):
valid_split = [split]
else:
valid_split = split
valid_dataloaders = [
dataloader for dataloader in dataloaders
if dataloader.split in valid_split
]
return model.score(valid_dataloaders)
def _logging(
self,
model: EmmentalModel,
dataloaders: List[EmmentalDataLoader],
batch_size: int,
) -> Dict[str, float]:
"""Check if it's time to evaluting or checkpointing.
Args:
model: The model to log.
dataloaders: The data to evaluate.
batch_size: Batch size.
Returns:
The score dict.
"""
# Switch to eval mode for evaluation
model.eval()
metric_dict = dict()
self.logging_manager.update(batch_size)
trigger_evaluation = self.logging_manager.trigger_evaluation()
# Log the loss and lr
metric_dict.update(
self._aggregate_running_metrics(
model,
trigger_evaluation
and Meta.config["learner_config"]["online_eval"],
))
# Evaluate the model and log the metric
if trigger_evaluation:
# Log task specific metric
metric_dict.update(
self._evaluate(model, dataloaders,
Meta.config["learner_config"]["valid_split"]))
self.logging_manager.write_log(metric_dict)
self._reset_losses()
elif Meta.config["logging_config"]["writer_config"][
"write_loss_per_step"]:
self.logging_manager.write_log(metric_dict)
# Log metric dict every trigger evaluation time or full epoch
if Meta.config["meta_config"]["verbose"] and (
trigger_evaluation or self.logging_manager.epoch_total == int(
self.logging_manager.epoch_total)):
logger.info(f"{self.logging_manager.counter_unit.capitalize()}: "
f"{self.logging_manager.unit_total:.2f} {metric_dict}")
# Checkpoint the model
if self.logging_manager.trigger_checkpointing():
self.logging_manager.checkpoint_model(model, self.optimizer,
self.lr_scheduler,
metric_dict)
self.logging_manager.write_log(metric_dict)
self._reset_losses()
# Switch to train mode
model.train()
return metric_dict
def _aggregate_running_metrics(
self,
model: EmmentalModel,
calc_running_scores: bool = False) -> Dict[str, float]:
"""Calculate the running overall and task specific metrics.
Args:
model: The model to evaluate.
calc_running_scores: Whether to calc running scores
Returns:
The score dict.
"""
metric_dict: Dict[str, float] = dict()
total_count = 0
# Log task specific loss
for identifier in self.running_uids.keys():
count = len(self.running_uids[identifier])
if count > 0:
metric_dict[identifier + "/loss"] = float(
self.running_losses[identifier] / count)
total_count += count
# Calculate average micro loss
if total_count > 0:
total_loss = sum(self.running_losses.values())
metric_dict["model/all/train/loss"] = float(total_loss /
total_count)
if calc_running_scores:
micro_score_dict: Dict[str, List[float]] = defaultdict(list)
macro_score_dict: Dict[str, List[float]] = defaultdict(list)
# Calculate training metric
for identifier in self.running_uids.keys():
task_name, data_name, split = identifier.split("/")
if (model.scorers[task_name] and self.running_golds[identifier]
and self.running_probs[identifier]):
metric_score = model.scorers[task_name].score(
self.running_golds[identifier],
self.running_probs[identifier],
prob_to_pred(self.running_probs[identifier]),
self.running_uids[identifier],
)
for metric_name, metric_value in metric_score.items():
metric_dict[
f"{identifier}/{metric_name}"] = metric_value
# Collect average score
identifier = construct_identifier(task_name, data_name,
split, "average")
metric_dict[identifier] = np.mean(
list(metric_score.values()))
micro_score_dict[split].extend(
list(metric_score.values()) # type: ignore
)
macro_score_dict[split].append(metric_dict[identifier])
# Collect split-wise micro/macro average score
for split in micro_score_dict.keys():
identifier = construct_identifier("model", "all", split,
"micro_average")
metric_dict[identifier] = np.mean(
micro_score_dict[split] # type: ignore
)
identifier = construct_identifier("model", "all", split,
"macro_average")
metric_dict[identifier] = np.mean(
macro_score_dict[split] # type: ignore
)
# Log the learning rate
metric_dict["model/all/train/lr"] = self.optimizer.param_groups[0][
"lr"]
return metric_dict
def _set_learning_counter(self) -> None:
if Meta.config["learner_config"]["n_steps"]:
if Meta.config["learner_config"]["skip_learned_data"]:
self.start_epoch = 0
self.start_step = 0
self.start_train_epoch = 0
self.start_train_step = Meta.config["learner_config"][
"steps_learned"]
else:
self.start_epoch = 0
self.start_step = Meta.config["learner_config"][
"steps_learned"]
self.start_train_epoch = 0
self.start_train_step = Meta.config["learner_config"][
"steps_learned"]
self.end_epoch = 1
self.end_step = Meta.config["learner_config"]["n_steps"]
self.use_step_base_counter = True
self.total_steps = Meta.config["learner_config"]["n_steps"]
else:
if Meta.config["learner_config"]["skip_learned_data"]:
self.start_epoch = 0
self.start_step = 0
self.start_train_epoch = Meta.config["learner_config"][
"epochs_learned"]
self.start_train_step = Meta.config["learner_config"][
"steps_learned"]
else:
self.start_epoch = Meta.config["learner_config"][
"epochs_learned"]
self.start_step = Meta.config["learner_config"][
"steps_learned"]
self.start_train_epoch = Meta.config["learner_config"][
"epochs_learned"]
self.start_train_step = Meta.config["learner_config"][
"steps_learned"]
self.end_epoch = Meta.config["learner_config"]["n_epochs"]
self.end_step = self.n_batches_per_epoch
self.use_step_base_counter = False
self.total_steps = (Meta.config["learner_config"]["n_epochs"] *
self.n_batches_per_epoch)
def _reset_losses(self) -> None:
"""Reset running logs."""
self.running_uids: Dict[str, List[str]] = defaultdict(list)
self.running_losses: Dict[str,
ndarray] = defaultdict(float) # type: ignore
self.running_probs: Dict[str, List[ndarray]] = defaultdict(list)
self.running_golds: Dict[str, List[ndarray]] = defaultdict(list)
def learn(self, model: EmmentalModel,
dataloaders: List[EmmentalDataLoader]) -> None:
"""Learning procedure of emmental MTL.
Args:
model: The emmental model that needs to learn.
dataloaders: A list of dataloaders used to learn the model.
"""
start_time = time.time()
# Generate the list of dataloaders for learning process
train_split = Meta.config["learner_config"]["train_split"]
if isinstance(train_split, str):
train_split = [train_split]
train_dataloaders = [
dataloader for dataloader in dataloaders
if dataloader.split in train_split
]
if not train_dataloaders:
raise ValueError(
f"Cannot find the specified train_split "
f'{Meta.config["learner_config"]["train_split"]} in dataloaders.'
)
# Set up task_scheduler
self._set_task_scheduler()
# Calculate the total number of batches per epoch
self.n_batches_per_epoch: int = self.task_scheduler.get_num_batches(
train_dataloaders)
if self.n_batches_per_epoch == 0:
logger.info("No batches in training dataloaders, existing...")
return
# Set up learning counter
self._set_learning_counter()
# Set up logging manager
self._set_logging_manager()
# Set up wandb watch model
if (Meta.config["logging_config"]["writer_config"]["writer"] == "wandb"
and Meta.config["logging_config"]["writer_config"]
["wandb_watch_model"]):
if Meta.config["logging_config"]["writer_config"][
"wandb_model_watch_freq"]:
wandb.watch(
model,
log_freq=Meta.config["logging_config"]["writer_config"]
["wandb_model_watch_freq"],
)
else:
wandb.watch(model)
# Set up optimizer
self._set_optimizer(model)
# Set up lr_scheduler
self._set_lr_scheduler(model)
if Meta.config["learner_config"]["fp16"]:
try:
from apex import amp # type: ignore
except ImportError:
raise ImportError(
"Please install apex from https://www.github.com/nvidia/apex to "
"use fp16 training.")
logger.info(
f"Modeling training with 16-bit (mixed) precision "
f"and {Meta.config['learner_config']['fp16_opt_level']} opt level."
)
model, self.optimizer = amp.initialize(
model,
self.optimizer,
opt_level=Meta.config["learner_config"]["fp16_opt_level"],
)
# Multi-gpu training (after apex fp16 initialization)
if (Meta.config["learner_config"]["local_rank"] == -1
and Meta.config["model_config"]["dataparallel"]):
model._to_dataparallel()
# Distributed training (after apex fp16 initialization)
if Meta.config["learner_config"]["local_rank"] != -1:
model._to_distributed_dataparallel()
# Set to training mode
model.train()
if Meta.config["meta_config"]["verbose"]:
logger.info("Start learning...")
self.metrics: Dict[str, float] = dict()
self._reset_losses()
# Set gradients of all model parameters to zero
self.optimizer.zero_grad()
batch_iterator = self.task_scheduler.get_batches(
train_dataloaders, model)
for epoch_num in range(self.start_epoch, self.end_epoch):
for train_dataloader in train_dataloaders:
# Set epoch for distributed sampler
if isinstance(train_dataloader, DataLoader) and isinstance(
train_dataloader.sampler, DistributedSampler):
train_dataloader.sampler.set_epoch(epoch_num)
step_pbar = tqdm(
range(self.start_step, self.end_step),
desc=f"Step {self.start_step + 1}/{self.end_step}"
if self.use_step_base_counter else
f"Epoch {epoch_num + 1}/{self.end_epoch}",
disable=not Meta.config["meta_config"]["verbose"]
or Meta.config["learner_config"]["local_rank"] not in [-1, 0],
)
for step_num in step_pbar:
if self.use_step_base_counter:
step_pbar.set_description(
f"Step {step_num + 1}/{self.total_steps}")
step_pbar.refresh()
try:
batch = next(batch_iterator)
except StopIteration:
batch_iterator = self.task_scheduler.get_batches(
train_dataloaders, model)
batch = next(batch_iterator)
# Check if skip the current batch
if epoch_num < self.start_train_epoch or (
epoch_num == self.start_train_epoch
and step_num < self.start_train_step):
continue
# Covert single batch into a batch list
if not isinstance(batch, list):
batch = [batch]
total_step_num = epoch_num * self.n_batches_per_epoch + step_num
batch_size = 0
for _batch in batch:
batch_size += len(_batch.uids)
# Perform forward pass and calcualte the loss and count
uid_dict, loss_dict, prob_dict, gold_dict = model(
_batch.uids,
_batch.X_dict,
_batch.Y_dict,
_batch.task_to_label_dict,
return_probs=Meta.config["learner_config"]
["online_eval"],
return_action_outputs=False,
)
# Update running loss and count
for task_name in uid_dict.keys():
identifier = f"{task_name}/{_batch.data_name}/{_batch.split}"
self.running_uids[identifier].extend(
uid_dict[task_name])
self.running_losses[identifier] += (
loss_dict[task_name].item() *
len(uid_dict[task_name])
if len(loss_dict[task_name].size()) == 0 else
torch.sum(loss_dict[task_name]).item()
) * model.task_weights[task_name]
if (Meta.config["learner_config"]["online_eval"]
and prob_dict and gold_dict):
self.running_probs[identifier].extend(
prob_dict[task_name])
self.running_golds[identifier].extend(
gold_dict[task_name])
# Calculate the average loss
loss = sum([
model.task_weights[task_name] *
task_loss if len(task_loss.size()) == 0 else
torch.mean(model.task_weights[task_name] * task_loss)
for task_name, task_loss in loss_dict.items()
])
# Perform backward pass to calculate gradients
if Meta.config["learner_config"]["fp16"]:
with amp.scale_loss(loss,
self.optimizer) as scaled_loss:
scaled_loss.backward()
else:
loss.backward() # type: ignore
if (total_step_num +
1) % Meta.config["learner_config"]["optimizer_config"][
"gradient_accumulation_steps"] == 0 or (
step_num + 1 == self.end_step
and epoch_num + 1 == self.end_epoch):
# Clip gradient norm
if Meta.config["learner_config"]["optimizer_config"][
"grad_clip"]:
if Meta.config["learner_config"]["fp16"]:
torch.nn.utils.clip_grad_norm_(
amp.master_params(self.optimizer),
Meta.config["learner_config"]
["optimizer_config"]["grad_clip"],
)
else:
torch.nn.utils.clip_grad_norm_(
model.parameters(),
Meta.config["learner_config"]
["optimizer_config"]["grad_clip"],
)
# Update the parameters
self.optimizer.step()
# Set gradients of all model parameters to zero
self.optimizer.zero_grad()
if Meta.config["learner_config"]["local_rank"] in [-1, 0]:
self.metrics.update(
self._logging(model, dataloaders, batch_size))
step_pbar.set_postfix(self.metrics)
# Update lr using lr scheduler
self._update_lr_scheduler(model, total_step_num, self.metrics)
step_pbar.close()
if Meta.config["learner_config"]["local_rank"] in [-1, 0]:
model = self.logging_manager.close(model)
logger.info(
f"Total learning time: {time.time() - start_time} seconds.")