def evaluation(cfg, ckpt, distributed):
logger = logging.getLogger("DSSD.inference")
model = build_detection_model(cfg)
checkpointer = CheckPointer(model, save_dir=cfg.OUTPUT_DIR, logger=logger)
device = torch.device(cfg.MODEL.DEVICE)
model.to(device)
checkpointer.load(ckpt, use_latest=ckpt is None)
do_evaluation(cfg, model, distributed)
def do_train(cfg, model,
data_loader,
optimizer,
scheduler,
checkpointer,
device,
arguments,
args):
logger = logging.getLogger("DSSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
#what does this do?
model.train()
save_to_disk = dist_util.get_rank() == 0
# implement logging here
if args.use_tensorboard and save_to_disk:
import tensorboardX
summary_writer = tensorboardX.SummaryWriter(log_dir=os.path.join(cfg.OUTPUT_DIR, 'tf_logs'))
else:
summary_writer = None
max_iter = len(data_loader)
start_iter = arguments["iteration"]
start_training_time = time.time()
end = time.time()
for iteration, (images, targets, _) in enumerate(data_loader, start_iter):
iteration = iteration + 1
arguments["iteration"] = iteration
if iteration > start_iter + 1 or torch.__version__[:3] <= '1.1':
scheduler.step()
images = images.to(device)
targets = targets.to(device)
loss_dict = model(images, targets=targets)
loss = sum(loss for loss in loss_dict.values())
# reduce losses over all GPUs for logging purposes
loss_dict_reduced = reduce_loss_dict(loss_dict)
losses_reduced = sum(loss for loss in loss_dict_reduced.values())
meters.update(total_loss=losses_reduced, **loss_dict_reduced)
# main work happens here
optimizer.zero_grad()
loss.backward()
optimizer.step()
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
if iteration % args.log_step == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
'{meters}',
"eta: {eta}",
'mem: {mem}M',
]).format(
iter=iteration,
lr=optimizer.param_groups[0]['lr'],
meters=str(meters),
eta=eta_string,
mem=round(torch.cuda.max_memory_allocated() / 1024.0 / 1024.0),
)
)
if summary_writer:
global_step = iteration
summary_writer.add_scalar('losses/total_loss', losses_reduced, global_step=global_step)
for loss_name, loss_item in loss_dict_reduced.items():
summary_writer.add_scalar('losses/{}'.format(loss_name), loss_item, global_step=global_step)
summary_writer.add_scalar('lr', optimizer.param_groups[0]['lr'], global_step=global_step)
if iteration % args.save_step == 0:
checkpointer.save("model_{:06d}".format(iteration), **arguments)
if args.eval_step > 0 and iteration % args.eval_step == 0 and not iteration == max_iter:
eval_results = do_evaluation(cfg, model, distributed=args.distributed, mode='val', iteration=iteration)
if dist_util.get_rank() == 0 and summary_writer:
for eval_result, dataset in zip(eval_results, cfg.DATASETS.VAL):
write_metric(eval_result['metrics'], 'metrics/' + dataset, summary_writer, iteration)
model.train() # *IMPORTANT*: change to train mode after eval.
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(total_time_str, total_training_time / max_iter))
return model
def main():
parser = argparse.ArgumentParser(
description=
'DSSD: Deconvolutional Single Shot MultiBox Detector Training With PyTorch'
)
parser.add_argument(
"--config-file",
default="",
metavar="FILE",
help="path to config file",
type=str,
)
parser.add_argument("--local_rank", type=int, default=0)
parser.add_argument('--log_step',
default=10,
type=int,
help='Print logs every log_step')
parser.add_argument('--save_step',
default=10000,
type=int,
help='Save checkpoint every save_step')
parser.add_argument(
'--eval_step',
default=10000,
type=int,
help='Evaluate dataset every eval_step, disabled when eval_step < 0')
parser.add_argument('--use_tensorboard', default=True, type=str2bool)
parser.add_argument(
"--skip-test",
dest="skip_test",
help="Do not test the final model",
action="store_true",
)
parser.add_argument(
"opts",
help="Modify config options using the command-line",
default=None,
nargs=argparse.REMAINDER,
)
args = parser.parse_args()
num_gpus = int(
os.environ["WORLD_SIZE"]) if "WORLD_SIZE" in os.environ else 1
args.distributed = num_gpus > 1
args.num_gpus = num_gpus
if torch.cuda.is_available():
# This flag allows you to enable the inbuilt cudnn auto-tuner to
# find the best algorithm to use for your hardware.
torch.backends.cudnn.benchmark = True
if args.distributed:
torch.cuda.set_device(args.local_rank)
torch.distributed.init_process_group(backend="nccl",
init_method="env://")
synchronize()
cfg.merge_from_file(args.config_file)
cfg.merge_from_list(args.opts)
cfg.freeze()
if cfg.OUTPUT_DIR:
mkdir(cfg.OUTPUT_DIR)
logger = setup_logger("DSSD", dist_util.get_rank(), cfg.OUTPUT_DIR)
logger.info("Using {} GPUs".format(num_gpus))
logger.info(args)
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))
model = train(cfg, args)
if not args.skip_test:
logger.info('Start evaluating...')
torch.cuda.empty_cache() # speed up evaluating after training finished
do_evaluation(cfg, model, distributed=args.distributed)