def prepare_task(
config: PyTextConfig,
dist_init_url: str = None,
device_id: int = 0,
rank: int = 0,
world_size: int = 1,
metric_channels: Optional[List[Channel]] = None,
metadata: CommonMetadata = None,
) -> Task:
if dist_init_url and world_size > 1:
assert metadata is not None
dist_init(rank, world_size, dist_init_url)
print("\nParameters: {}\n".format(config))
_set_cuda(config.use_cuda_if_available, device_id, world_size)
_set_fp16(config.use_fp16 and world_size == 1)
if config.random_seed is not None:
set_random_seeds(config.random_seed)
if config.load_snapshot_path and os.path.isfile(config.load_snapshot_path):
task = load(config.load_snapshot_path)
else:
task = create_task(config.task, metadata=metadata)
for mc in metric_channels or []:
task.metric_reporter.add_channel(mc)
return task
def _set_distributed(
rank: int, world_size: int, dist_init_url: str, device_id: int, gpu_streams: int = 1
) -> None:
if dist_init_url and world_size > 1:
distributed.dist_init(
rank, world_size, dist_init_url, device_id, gpu_streams=gpu_streams
)
def _set_distributed(
rank: int,
world_size: int,
dist_init_url: str,
device_id: int,
) -> None:
if dist_init_url and world_size > 1:
distributed.dist_init(rank, world_size, dist_init_url, device_id)
def _set_distributed(
rank: int,
world_size: int,
dist_init_url: str,
device_id: int,
metadata: CommonMetadata,
) -> None:
if dist_init_url and world_size > 1:
assert metadata is not None
distributed.dist_init(rank, world_size, dist_init_url, device_id)
def train(
self, config: PyTextConfig, rank: int = 0, world_size: int = 1, dist_init_url=""
):
# TODO: move dist_init back to prepare_task in pytext/workflow.py
# when processing time between dist_init and first loss.backward() is short
if dist_init_url and world_size > 1:
distributed.dist_init(rank, world_size, dist_init_url)
return self.trainer.train(
self.data.batches(Stage.TRAIN),
self.data.batches(Stage.EVAL),
self.model,
self.metric_reporter,
config,
rank=rank,
)
def train_single_model(
self, train_config, model_id, rank=0, world_size=1, dist_init_url=""
):
assert model_id >= 0 and model_id < len(self.model.models)
train_iter = self.data_handler.get_train_iter(rank, world_size)
eval_iter = self.data_handler.get_eval_iter()
if dist_init_url and world_size > 1:
distributed.dist_init(rank, world_size, dist_init_url)
return self.trainer.train_single_model(
train_iter,
eval_iter,
self.model.models[model_id],
self.metric_reporter,
train_config,
)
def train(self, train_config, rank=0, world_size=1, dist_init_url=""):
"""
Wrapper method to train the model using :class:`~Trainer` object.
Args:
train_config (PyTextConfig): config for training
rank (int): for distributed training only, rank of the gpu, default is 0
world_size (int): for distributed training only, total gpu to use, default
is 1
"""
train_iter = self.data_handler.get_train_iter(rank, world_size)
eval_iter = self.data_handler.get_eval_iter()
if dist_init_url and world_size > 1:
distributed.dist_init(rank, world_size, dist_init_url)
result = self.trainer.train(
train_iter,
eval_iter,
self.model,
self.metric_reporter,
train_config,
rank=rank,
)
return result