def _parse_losses(self, losses):
"""Parse the raw outputs (losses) of the network.
Args:
losses (dict): Raw output of the network, which usually contain
losses and other necessary infomation.
Returns:
tuple[Tensor, dict]: (loss, log_vars), loss is the loss tensor \
which may be a weighted sum of all losses, log_vars contains \
all the variables to be sent to the logger.
"""
log_vars = OrderedDict()
for loss_name, loss_value in losses.items():
if isinstance(loss_value, torch.Tensor):
log_vars[loss_name] = loss_value.mean()
elif isinstance(loss_value, list):
log_vars[loss_name] = sum(_loss.mean() for _loss in loss_value)
else:
raise TypeError(
f'{loss_name} is not a tensor or list of tensors')
loss = sum(_value for _key, _value in log_vars.items()
if 'loss' in _key)
log_vars['loss'] = loss
for loss_name, loss_value in log_vars.items():
# reduce loss when distributed training
if dist.is_available() and dist.is_initialized():
loss_value = loss_value.data.clone()
dist.all_reduce(loss_value.div_(dist.get_world_size()))
log_vars[loss_name] = loss_value.item()
return loss, log_vars
def __init__(self,
dataset,
samples_per_gpu=1,
num_replicas=None,
rank=None):
_rank, _num_replicas = dist.get_rank(), dist.get_world_size()
if num_replicas is None:
num_replicas = _num_replicas
if rank is None:
rank = _rank
self.dataset = dataset
self.samples_per_gpu = samples_per_gpu
self.num_replicas = num_replicas
self.rank = rank
self.epoch = 0
assert hasattr(self.dataset, 'flag')
self.flag = self.dataset.flag
self.group_sizes = np.bincount(self.flag)
self.num_samples = 0
for i, j in enumerate(self.group_sizes):
self.num_samples += int(
math.ceil(self.group_sizes[i] * 1.0 / self.samples_per_gpu /
self.num_replicas)) * self.samples_per_gpu
self.total_size = self.num_samples * self.num_replicas
def get_world_size():
if run_herring:
return herring.get_world_size()
else:
if not dist.is_available():
return 1
if not dist.is_initialized():
return 1
return dist.get_world_size()
def allreduce_grads(params, coalesce=True, bucket_size_mb=-1):
"""Allreduce gradients.
Args:
params (list[torch.Parameters]): List of parameters of a model
coalesce (bool, optional): Whether allreduce parameters as a whole.
Defaults to True.
bucket_size_mb (int, optional): Size of bucket, the unit is MB.
Defaults to -1.
"""
grads = [
param.grad.data for param in params
if param.requires_grad and param.grad is not None
]
world_size = dist.get_world_size()
if coalesce:
_allreduce_coalesced(grads, world_size, bucket_size_mb)
else:
for tensor in grads:
dist.all_reduce(tensor.div_(world_size))
def __init__(self, dataset, num_replicas=None, rank=None, shuffle=True):
if num_replicas is None:
if run_herring:
num_replicas = herring.get_world_size()
else:
if not dist.is_available():
raise RuntimeError("Requires distributed package to be available")
num_replicas = dist.get_world_size()
if rank is None:
if run_herring:
rank = herring.get_rank()
else:
if not dist.is_available():
raise RuntimeError("Requires distributed package to be available")
rank = dist.get_rank()
self.dataset = dataset
self.num_replicas = num_replicas
self.rank = rank
self.epoch = 0
self.num_samples = int(math.ceil(len(self.dataset) * 1.0 / self.num_replicas))
self.total_size = self.num_samples * self.num_replicas
self.shuffle = shuffle
def main():
configure_logger(constants.MASKRCNN)
log_start(key=constants.INIT_START)
parser = argparse.ArgumentParser(
description="PyTorch Object Detection Training")
parser.add_argument(
"--config-file",
default="",
metavar="FILE",
help="path to config file",
type=str,
)
parser.add_argument("--local_rank",
type=int,
default=herring.get_local_rank())
parser.add_argument(
"opts",
help="Modify config options using the command-line",
default=None,
nargs=argparse.REMAINDER,
)
args = parser.parse_args()
num_gpus = herring.get_world_size()
args.distributed = num_gpus > 1
args.local_rank = herring.get_local_rank()
# if is_main_process:
# # Setting logging file parameters for compliance logging
# os.environ["COMPLIANCE_FILE"] = '/MASKRCNN_complVv0.5.0_' + str(datetime.datetime.now())
# constants.LOG_FILE = os.getenv("COMPLIANCE_FILE")
# constants._FILE_HANDLER = logging.FileHandler(constants.LOG_FILE)
# constants._FILE_HANDLER.setLevel(logging.DEBUG)
# constants.LOGGER.addHandler(constants._FILE_HANDLER)
if args.distributed:
torch.cuda.set_device(args.local_rank)
# setting seeds - needs to be timed, so after RUN_START
if is_main_process():
master_seed = random.SystemRandom().randint(0, 2**32 - 1)
seed_tensor = torch.tensor(master_seed,
dtype=torch.float32,
device=torch.device("cuda"))
else:
seed_tensor = torch.tensor(0,
dtype=torch.float32,
device=torch.device("cuda"))
herring.broadcast(seed_tensor, 0)
master_seed = int(seed_tensor.item())
else:
# random master seed, random.SystemRandom() uses /dev/urandom on Unix
master_seed = random.SystemRandom().randint(0, 2**32 - 1)
# actually use the random seed
args.seed = master_seed
# random number generator with seed set to master_seed
random_number_generator = random.Random(master_seed)
log_event(key=constants.SEED, value=master_seed)
cfg.merge_from_file(args.config_file)
cfg.merge_from_list(args.opts)
cfg.freeze()
output_dir = cfg.OUTPUT_DIR
if output_dir:
mkdir(output_dir)
logger = setup_logger("maskrcnn_benchmark", output_dir, get_rank())
logger.info("Using {} GPUs".format(num_gpus))
logger.info(args)
# generate worker seeds, one seed for every distributed worker
worker_seeds = generate_seeds(random_number_generator,
herring.get_world_size())
# todo sharath what if CPU
# broadcast seeds from rank=0 to other workers
worker_seeds = broadcast_seeds(worker_seeds, device='cuda')
# Setting worker seeds
logger.info("Worker {}: Setting seed {}".format(
args.local_rank, worker_seeds[args.local_rank]))
torch.manual_seed(worker_seeds[args.local_rank])
logger.info("Collecting env info (might take some time)")
logger.info("\n" + collect_env_info())
logger.info("Loaded configuration file {}".format(args.config_file))
with open(args.config_file, "r") as cf:
config_str = "\n" + cf.read()
logger.info(config_str)
logger.info("Running with config:\n{}".format(cfg))
# Initialise async eval
init()
model, success = train(cfg, args.local_rank, args.distributed,
random_number_generator)
if success is not None:
if success:
log_end(key=constants.RUN_STOP, metadata={"status": "success"})
else:
log_end(key=constants.RUN_STOP, metadata={"status": "aborted"})
def build_dataloader(dataset,
samples_per_gpu,
workers_per_gpu,
num_gpus=1,
dist=True,
shuffle=True,
seed=None,
**kwargs):
"""Build PyTorch DataLoader.
In distributed training, each GPU/process has a dataloader.
In non-distributed training, there is only one dataloader for all GPUs.
Args:
dataset (Dataset): A PyTorch dataset.
samples_per_gpu (int): Number of training samples on each GPU, i.e.,
batch size of each GPU.
workers_per_gpu (int): How many subprocesses to use for data loading
for each GPU.
num_gpus (int): Number of GPUs. Only used in non-distributed training.
dist (bool): Distributed training/test or not. Default: True.
shuffle (bool): Whether to shuffle the data at every epoch.
Default: True.
kwargs: any keyword argument to be used to initialize DataLoader
Returns:
DataLoader: A PyTorch dataloader.
"""
rank, world_size = dist.get_rank(), dist.get_world_size()
if dist:
# DistributedGroupSampler will definitely shuffle the data to satisfy
# that images on each GPU are in the same group
if shuffle:
sampler = DistributedGroupSampler(dataset, samples_per_gpu,
world_size, rank)
else:
sampler = DistributedSampler(dataset,
world_size,
rank,
shuffle=False)
batch_size = samples_per_gpu
num_workers = workers_per_gpu
else:
sampler = GroupSampler(dataset, samples_per_gpu) if shuffle else None
batch_size = num_gpus * samples_per_gpu
num_workers = num_gpus * workers_per_gpu
init_fn = partial(
worker_init_fn, num_workers=num_workers, rank=rank,
seed=seed) if seed is not None else None
data_loader = DataLoader(dataset,
batch_size=batch_size,
sampler=sampler,
num_workers=num_workers,
collate_fn=partial(
collate, samples_per_gpu=samples_per_gpu),
pin_memory=False,
worker_init_fn=init_fn,
**kwargs)
return data_loader
def reduce_mean(tensor):
if not (dist.is_available() and dist.is_initialized()):
return tensor
tensor = tensor.clone()
dist.all_reduce(tensor.div_(dist.get_world_size()), op=dist.ReduceOp.SUM)
return tensor
def make_data_sampler(dataset, shuffle, distributed):
if distributed:
if run_herring:
return samplers.DistributedSampler(dataset, shuffle=shuffle, num_replicas=herring.get_world_size(),
rank=herring.get_rank())
else:
return samplers.DistributedSampler(dataset, shuffle=shuffle)
if shuffle:
sampler = torch.utils.data.sampler.RandomSampler(dataset)
else:
sampler = torch.utils.data.sampler.SequentialSampler(dataset)
return sampler
