def train_dino(args):
utils.init_distributed_mode(args)
utils.fix_random_seeds(args.seed)
print("git:\n {}\n".format(utils.get_sha()))
print("\n".join("%s: %s" % (k, str(v))
for k, v in sorted(dict(vars(args)).items())))
cudnn.benchmark = True
# ============ preparing data ... ============
transform = DataAugmentationDINO(
args.global_crops_scale,
args.local_crops_scale,
args.local_crops_number,
)
#dataset = datasets.ImageFolder(args.data_path, transform=transform)
from sen12ms import get_transform
dataset = AllSen12MSDataset(args.data_path,
"train",
transform=transform,
tansform_coord=None,
classes=None,
seasons=None,
split_by_region=True,
download=False)
sampler = torch.utils.data.DistributedSampler(dataset, shuffle=True)
data_loader = torch.utils.data.DataLoader(
dataset,
sampler=sampler,
batch_size=args.batch_size_per_gpu,
num_workers=args.num_workers,
pin_memory=True,
drop_last=True,
)
print(f"Data loaded: there are {len(dataset)} images.")
# ============ building student and teacher networks ... ============
# if the network is a vision transformer (i.e. deit_tiny, deit_small, vit_base)
if args.arch in vits.__dict__.keys():
student = vits.__dict__[args.arch](
patch_size=args.patch_size,
drop_path_rate=0.1, # stochastic depth
)
teacher = vits.__dict__[args.arch](patch_size=args.patch_size)
embed_dim = student.embed_dim
student = utils.replace_input_layer(student, inchannels=13)
teacher = utils.replace_input_layer(teacher, inchannels=13)
# otherwise, we check if the architecture is in torchvision models
elif args.arch in torchvision_models.__dict__.keys():
student = torchvision_models.__dict__[args.arch]()
teacher = torchvision_models.__dict__[args.arch]()
embed_dim = student.fc.weight.shape[1]
else:
print(f"Unknow architecture: {args.arch}")
# multi-crop wrapper handles forward with inputs of different resolutions
student = utils.MultiCropWrapper(
student,
DINOHead(
embed_dim,
args.out_dim,
use_bn=args.use_bn_in_head,
norm_last_layer=args.norm_last_layer,
))
teacher = utils.MultiCropWrapper(
teacher,
DINOHead(embed_dim, args.out_dim, args.use_bn_in_head),
)
# move networks to gpu
student, teacher = student.cuda(), teacher.cuda()
# synchronize batch norms (if any)
if utils.has_batchnorms(student):
student = nn.SyncBatchNorm.convert_sync_batchnorm(student)
teacher = nn.SyncBatchNorm.convert_sync_batchnorm(teacher)
# we need DDP wrapper to have synchro batch norms working...
teacher = nn.parallel.DistributedDataParallel(teacher,
device_ids=[args.gpu])
teacher_without_ddp = teacher.module
else:
# teacher_without_ddp and teacher are the same thing
teacher_without_ddp = teacher
student = nn.parallel.DistributedDataParallel(student,
device_ids=[args.gpu])
# teacher and student start with the same weights
teacher_without_ddp.load_state_dict(student.module.state_dict())
# there is no backpropagation through the teacher, so no need for gradients
for p in teacher.parameters():
p.requires_grad = False
print(f"Student and Teacher are built: they are both {args.arch} network.")
# ============ preparing loss ... ============
dino_loss = DINOLoss(
args.out_dim,
args.local_crops_number +
2, # total number of crops = 2 global crops + local_crops_number
args.warmup_teacher_temp,
args.teacher_temp,
args.warmup_teacher_temp_epochs,
args.epochs,
).cuda()
# ============ preparing optimizer ... ============
params_groups = utils.get_params_groups(student)
if args.optimizer == "adamw":
optimizer = torch.optim.AdamW(params_groups) # to use with ViTs
elif args.optimizer == "sgd":
optimizer = torch.optim.SGD(params_groups, lr=0,
momentum=0.9) # lr is set by scheduler
elif args.optimizer == "lars":
optimizer = utils.LARS(
params_groups) # to use with convnet and large batches
# for mixed precision training
fp16_scaler = None
if args.use_fp16:
fp16_scaler = torch.cuda.amp.GradScaler()
# ============ init schedulers ... ============
lr_schedule = utils.cosine_scheduler(
args.lr * (args.batch_size_per_gpu * utils.get_world_size()) /
256., # linear scaling rule
args.min_lr,
args.epochs,
len(data_loader),
warmup_epochs=args.warmup_epochs,
)
wd_schedule = utils.cosine_scheduler(
args.weight_decay,
args.weight_decay_end,
args.epochs,
len(data_loader),
)
# momentum parameter is increased to 1. during training with a cosine schedule
momentum_schedule = utils.cosine_scheduler(args.momentum_teacher, 1,
args.epochs, len(data_loader))
print(f"Loss, optimizer and schedulers ready.")
# ============ optionally resume training ... ============
to_restore = {"epoch": 0}
utils.restart_from_checkpoint(
os.path.join(args.output_dir, "checkpoint.pth"),
run_variables=to_restore,
student=student,
teacher=teacher,
optimizer=optimizer,
fp16_scaler=fp16_scaler,
dino_loss=dino_loss,
)
start_epoch = to_restore["epoch"]
start_time = time.time()
print("Starting DINO training !")
for epoch in range(start_epoch, args.epochs):
data_loader.sampler.set_epoch(epoch)
# ============ training one epoch of DINO ... ============
train_stats = train_one_epoch(student, teacher, teacher_without_ddp,
dino_loss, data_loader, optimizer,
lr_schedule, wd_schedule,
momentum_schedule, epoch, fp16_scaler,
args)
# ============ writing logs ... ============
save_dict = {
'student': student.state_dict(),
'teacher': teacher.state_dict(),
'optimizer': optimizer.state_dict(),
'epoch': epoch + 1,
'args': args,
'dino_loss': dino_loss.state_dict(),
}
if fp16_scaler is not None:
save_dict['fp16_scaler'] = fp16_scaler.state_dict()
utils.save_on_master(save_dict,
os.path.join(args.output_dir, 'checkpoint.pth'))
if args.saveckp_freq and epoch % args.saveckp_freq == 0:
utils.save_on_master(
save_dict,
os.path.join(args.output_dir, f'checkpoint{epoch:04}.pth'))
log_stats = {
**{f'train_{k}': v
for k, v in train_stats.items()}, 'epoch': epoch
}
if utils.is_main_process():
with (Path(args.output_dir) / "log.txt").open("a") as f:
f.write(json.dumps(log_stats) + "\n")
total_time = time.time() - start_time
total_time_str = str(datetime.timedelta(seconds=int(total_time)))
print('Training time {}'.format(total_time_str))
def eval_linear(args):
utils.init_distributed_mode(args)
print("git:\n {}\n".format(utils.get_sha()))
print("\n".join("%s: %s" % (k, str(v)) for k, v in sorted(dict(vars(args)).items())))
cudnn.benchmark = True
# ============ preparing data ... ============
train_transform = pth_transforms.Compose([
pth_transforms.RandomResizedCrop(224),
pth_transforms.RandomHorizontalFlip(),
pth_transforms.ToTensor(),
pth_transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225)),
])
val_transform = pth_transforms.Compose([
pth_transforms.Resize(256, interpolation=3),
pth_transforms.CenterCrop(224),
pth_transforms.ToTensor(),
pth_transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225)),
])
dataset_train = datasets.ImageFolder(os.path.join(args.data_path, "train"), transform=train_transform)
dataset_val = datasets.ImageFolder(os.path.join(args.data_path, "val"), transform=val_transform)
sampler = torch.utils.data.distributed.DistributedSampler(dataset_train)
train_loader = torch.utils.data.DataLoader(
dataset_train,
sampler=sampler,
batch_size=args.batch_size_per_gpu,
num_workers=args.num_workers,
pin_memory=True,
)
val_loader = torch.utils.data.DataLoader(
dataset_val,
batch_size=args.batch_size_per_gpu,
num_workers=args.num_workers,
pin_memory=True,
)
print(f"Data loaded with {len(dataset_train)} train and {len(dataset_val)} val imgs.")
# ============ building network ... ============
model = vits.__dict__[args.arch](patch_size=args.patch_size, num_classes=0)
model.cuda()
model.eval()
print(f"Model {args.arch} {args.patch_size}x{args.patch_size} built.")
# load weights to evaluate
utils.load_pretrained_weights(model, args.pretrained_weights, args.checkpoint_key, args.arch, args.patch_size)
linear_classifier = LinearClassifier(model.embed_dim * (args.n_last_blocks + int(args.avgpool_patchtokens)), num_labels=args.num_labels)
linear_classifier = linear_classifier.cuda()
linear_classifier = nn.parallel.DistributedDataParallel(linear_classifier, device_ids=[args.gpu])
# set optimizer
optimizer = torch.optim.SGD(
linear_classifier.parameters(),
args.lr * (args.batch_size_per_gpu * utils.get_world_size()) / 256., # linear scaling rule
momentum=0.9,
weight_decay=0, # we do not apply weight decay
)
scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(optimizer, args.epochs, eta_min=0)
# Optionally resume from a checkpoint
to_restore = {"epoch": 0, "best_acc": 0.}
utils.restart_from_checkpoint(
os.path.join(args.output_dir, "checkpoint.pth.tar"),
run_variables=to_restore,
state_dict=linear_classifier,
optimizer=optimizer,
scheduler=scheduler,
)
start_epoch = to_restore["epoch"]
best_acc = to_restore["best_acc"]
for epoch in range(start_epoch, args.epochs):
train_loader.sampler.set_epoch(epoch)
train_stats = train(model, linear_classifier, optimizer, train_loader, epoch, args.n_last_blocks, args.avgpool_patchtokens)
scheduler.step()
log_stats = {**{f'train_{k}': v for k, v in train_stats.items()},
'epoch': epoch}
if epoch % args.val_freq == 0 or epoch == args.epochs - 1:
test_stats = validate_network(val_loader, model, linear_classifier, args.n_last_blocks, args.avgpool_patchtokens)
print(f"Accuracy at epoch {epoch} of the network on the {len(dataset_val)} test images: {test_stats['acc1']:.1f}%")
best_acc = max(best_acc, test_stats["acc1"])
print(f'Max accuracy so far: {best_acc:.2f}%')
log_stats = {**{k: v for k, v in log_stats.items()},
**{f'test_{k}': v for k, v in test_stats.items()}}
if utils.is_main_process():
with (Path(args.output_dir) / "log.txt").open("a") as f:
f.write(json.dumps(log_stats) + "\n")
save_dict = {
"epoch": epoch + 1,
"state_dict": linear_classifier.state_dict(),
"optimizer": optimizer.state_dict(),
"scheduler": scheduler.state_dict(),
"best_acc": best_acc,
}
torch.save(save_dict, os.path.join(args.output_dir, "checkpoint.pth.tar"))
print("Training of the supervised linear classifier on frozen features completed.\n"
"Top-1 test accuracy: {acc:.1f}".format(acc=best_acc))
def main():
# parse arguments
global args
parser = parse_arguments()
args = parser.parse_args()
# exp setup: logger, distributed mode and seeds
init_distributed_mode(args)
init_signal_handler()
fix_random_seeds(args.seed)
logger, training_stats = initialize_exp(args, "epoch", "loss")
if args.rank == 0:
writer = SummaryWriter(args.dump_path)
else:
writer = None
# build data
train_dataset = AVideoDataset(
ds_name=args.ds_name,
root_dir=args.root_dir,
mode='train',
path_to_data_dir=args.data_path,
num_frames=args.num_frames,
target_fps=args.target_fps,
sample_rate=args.sample_rate,
num_train_clips=args.num_train_clips,
train_crop_size=args.train_crop_size,
test_crop_size=args.test_crop_size,
num_data_samples=args.num_data_samples,
colorjitter=args.colorjitter,
use_grayscale=args.use_grayscale,
use_gaussian=args.use_gaussian,
temp_jitter=True,
decode_audio=True,
aug_audio=None,
num_sec=args.num_sec_aud,
aud_sample_rate=args.aud_sample_rate,
aud_spec_type=args.aud_spec_type,
use_volume_jittering=args.use_volume_jittering,
use_temporal_jittering=args.use_audio_temp_jittering,
z_normalize=args.z_normalize,
dual_data=args.dual_data
)
sampler = torch.utils.data.distributed.DistributedSampler(train_dataset)
train_loader = torch.utils.data.DataLoader(
train_dataset,
sampler=sampler,
batch_size=args.batch_size,
num_workers=args.workers,
pin_memory=True,
drop_last=True
)
logger.info("Loaded data with {} videos.".format(len(train_dataset)))
# Load model
model = load_model(
vid_base_arch=args.vid_base_arch,
aud_base_arch=args.aud_base_arch,
use_mlp=args.use_mlp,
num_classes=args.mlp_dim,
pretrained=False,
norm_feat=False,
use_max_pool=False,
headcount=args.headcount,
)
# synchronize batch norm layers
if args.sync_bn == "pytorch":
model = nn.SyncBatchNorm.convert_sync_batchnorm(model)
elif args.sync_bn == "apex":
process_group = None
if args.world_size // 8 > 0:
process_group = apex.parallel.create_syncbn_process_group(args.world_size // 8)
model = apex.parallel.convert_syncbn_model(model, process_group=process_group)
# copy model to GPU
model = model.cuda()
if args.rank == 0:
logger.info(model)
logger.info("Building model done.")
# build optimizer
optimizer = torch.optim.SGD(
model.parameters(),
lr=args.base_lr,
momentum=0.9,
weight_decay=args.wd,
)
if args.use_warmup_scheduler:
lr_scheduler = GradualWarmupScheduler(
optimizer,
multiplier=args.world_size,
total_epoch=args.warmup_epochs,
after_scheduler=None
)
else:
lr_scheduler = None
logger.info("Building optimizer done.")
# init mixed precision
if args.use_fp16:
model, optimizer = apex.amp.initialize(model, optimizer, opt_level="O1")
logger.info("Initializing mixed precision done.")
# wrap model
model = nn.parallel.DistributedDataParallel(
model,
device_ids=[args.gpu_to_work_on],
find_unused_parameters=True,
)
# SK-Init
N_dl = len(train_loader)
N = len(train_loader.dataset)
N_distr = N_dl * train_loader.batch_size
selflabels = torch.zeros((N, args.headcount), dtype=torch.long, device='cuda')
global sk_schedule
sk_schedule = (args.epochs * N_dl * (np.linspace(0, 1, args.nopts) ** args.schedulepower)[::-1]).tolist()
# to make sure we don't make it empty
sk_schedule = [(args.epochs + 2) * N_dl] + sk_schedule
logger.info(f'remaining SK opts @ epochs {[np.round(1.0 * t / N_dl, 2) for t in sk_schedule]}')
# optionally resume from a checkpoint
to_restore = {"epoch": 0, 'selflabels': selflabels, 'dist':args.dist}
restart_from_checkpoint(
os.path.join(args.dump_path, "checkpoint.pth.tar"),
run_variables=to_restore,
model=model,
optimizer=optimizer,
amp=apex.amp if args.use_fp16 else None,
)
start_epoch = to_restore["epoch"]
selflabels = to_restore["selflabels"]
args.dist = to_restore["dist"]
# Set CuDNN benhcmark
cudnn.benchmark = True
# Restart schedule correctly
if start_epoch != 0:
include = [(qq / N_dl > start_epoch) for qq in sk_schedule]
# (total number of sk-opts) - (number of sk-opts outstanding)
global sk_counter
sk_counter = len(sk_schedule) - sum(include)
sk_schedule = (np.array(sk_schedule)[include]).tolist()
if lr_scheduler:
[lr_scheduler.step() for _ in range(to_restore['epoch'])]
if start_epoch == 0:
train_loader.sampler.set_epoch(999)
warmup_batchnorm(args, model, train_loader, batches=20, group=group)
for epoch in range(start_epoch, args.epochs):
# train the network for one epoch
logger.info("============ Starting epoch %i ... ============" % epoch)
if writer:
writer.add_scalar('train/epoch', epoch, epoch)
# set sampler
train_loader.sampler.set_epoch(epoch)
# train the network
scores, selflabels = train(
train_loader, model, optimizer, epoch, writer, selflabels)
training_stats.update(scores)
# Update LR scheduler
if lr_scheduler:
lr_scheduler.step()
# save checkpoints
if args.rank == 0:
save_dict = {
"epoch": epoch + 1,
"dist": args.dist,
"model": model.state_dict(),
"optimizer": optimizer.state_dict(),
"selflabels": selflabels
}
if args.use_fp16:
save_dict["amp"] = apex.amp.state_dict()
torch.save(
save_dict,
os.path.join(args.dump_path, "checkpoint.pth.tar"),
)
if epoch % args.checkpoint_freq == 0 or epoch == args.epochs - 1:
shutil.copyfile(
os.path.join(args.dump_path, "checkpoint.pth.tar"),
os.path.join(args.dump_checkpoints, "ckp-" + str(epoch) + ".pth")
)