def main():
args = parse_option()
if args.gpu is not None:
print("Use GPU: {} for training".format(args.gpu))
# set the data loader
data_folder = os.path.join(args.data_folder, 'train')
image_size = 224
mean = [0.485, 0.456, 0.406]
std = [0.229, 0.224, 0.225]
normalize = transforms.Normalize(mean=mean, std=std)
if args.aug == 'NULL':
train_transform = transforms.Compose([
transforms.RandomResizedCrop(image_size, scale=(args.crop, 1.)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
])
elif args.aug == 'CJ':
train_transform = transforms.Compose([
transforms.RandomResizedCrop(image_size, scale=(args.crop, 1.)),
transforms.RandomGrayscale(p=0.2),
transforms.ColorJitter(0.4, 0.4, 0.4, 0.4),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
])
else:
raise NotImplemented('augmentation not supported: {}'.format(args.aug))
train_dataset = ImageFolderInstance(data_folder,
transform=train_transform,
two_crop=args.moco)
print(len(train_dataset))
train_sampler = None
train_loader = torch.utils.data.DataLoader(train_dataset,
batch_size=args.batch_size,
shuffle=(train_sampler is None),
num_workers=args.num_workers,
pin_memory=True,
sampler=train_sampler)
# create model and optimizer
n_data = len(train_dataset)
if args.model == 'resnet50':
model = InsResNet50()
if args.moco:
model_ema = InsResNet50()
elif args.model == 'resnet50x2':
model = InsResNet50(width=2)
if args.moco:
model_ema = InsResNet50(width=2)
elif args.model == 'resnet50x4':
model = InsResNet50(width=4)
if args.moco:
model_ema = InsResNet50(width=4)
else:
raise NotImplementedError('model not supported {}'.format(args.model))
# copy weights from `model' to `model_ema'
if args.moco:
moment_update(model, model_ema, 0)
# set the contrast memory and criterion
if args.moco:
contrast = MemoryMoCo(128, n_data, args.nce_k, args.nce_t,
args.softmax).cuda(args.gpu)
else:
contrast = MemoryInsDis(128, n_data, args.nce_k, args.nce_t,
args.nce_m, args.softmax).cuda(args.gpu)
criterion = NCESoftmaxLoss() if args.softmax else NCECriterion(n_data)
criterion = criterion.cuda(args.gpu)
model = model.cuda()
if args.moco:
model_ema = model_ema.cuda()
optimizer = torch.optim.SGD(model.parameters(),
lr=args.learning_rate,
momentum=args.momentum,
weight_decay=args.weight_decay)
cudnn.benchmark = True
if args.amp:
model, optimizer = amp.initialize(model,
optimizer,
opt_level=args.opt_level)
if args.moco:
optimizer_ema = torch.optim.SGD(model_ema.parameters(),
lr=0,
momentum=0,
weight_decay=0)
model_ema, optimizer_ema = amp.initialize(model_ema,
optimizer_ema,
opt_level=args.opt_level)
# optionally resume from a checkpoint
args.start_epoch = 1
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(args.resume, map_location='cpu')
# checkpoint = torch.load(args.resume)
args.start_epoch = checkpoint['epoch'] + 1
model.load_state_dict(checkpoint['model'])
optimizer.load_state_dict(checkpoint['optimizer'])
contrast.load_state_dict(checkpoint['contrast'])
if args.moco:
model_ema.load_state_dict(checkpoint['model_ema'])
if args.amp and checkpoint['opt'].amp:
print('==> resuming amp state_dict')
amp.load_state_dict(checkpoint['amp'])
print("=> loaded successfully '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
del checkpoint
torch.cuda.empty_cache()
else:
print("=> no checkpoint found at '{}'".format(args.resume))
# tensorboard
logger = tb_logger.Logger(logdir=args.tb_folder, flush_secs=2)
# routine
for epoch in range(args.start_epoch, args.epochs + 1):
adjust_learning_rate(epoch, args, optimizer)
print("==> training...")
time1 = time.time()
if args.moco:
loss, prob = train_moco(epoch, train_loader, model, model_ema,
contrast, criterion, optimizer, args)
else:
loss, prob = train_ins(epoch, train_loader, model, contrast,
criterion, optimizer, args)
time2 = time.time()
print('epoch {}, total time {:.2f}'.format(epoch, time2 - time1))
# tensorboard logger
logger.log_value('ins_loss', loss, epoch)
logger.log_value('ins_prob', prob, epoch)
logger.log_value('learning_rate', optimizer.param_groups[0]['lr'],
epoch)
# save model
if epoch % args.save_freq == 0:
print('==> Saving...')
state = {
'opt': args,
'model': model.state_dict(),
'contrast': contrast.state_dict(),
'optimizer': optimizer.state_dict(),
'epoch': epoch,
}
if args.moco:
state['model_ema'] = model_ema.state_dict()
if args.amp:
state['amp'] = amp.state_dict()
save_file = os.path.join(
args.model_folder,
'ckpt_epoch_{epoch}.pth'.format(epoch=epoch))
torch.save(state, save_file)
# help release GPU memory
del state
# saving the model
print('==> Saving...')
state = {
'opt': args,
'model': model.state_dict(),
'contrast': contrast.state_dict(),
'optimizer': optimizer.state_dict(),
'epoch': epoch,
}
if args.moco:
state['model_ema'] = model_ema.state_dict()
if args.amp:
state['amp'] = amp.state_dict()
save_file = os.path.join(args.model_folder, 'current.pth')
torch.save(state, save_file)
if epoch % args.save_freq == 0:
save_file = os.path.join(
args.model_folder,
'ckpt_epoch_{epoch}.pth'.format(epoch=epoch))
torch.save(state, save_file)
# help release GPU memory
del state
torch.cuda.empty_cache()
def main():
args = parse_option()
if args.gpu is not None:
print("Use GPU: {} for training".format(args.gpu))
# set the data loader
data_folder = os.path.join(args.data_folder, 'train')
val_folder = os.path.join(args.data_folder, 'val')
crop_padding = 32
image_size = 224
mean = [0.485, 0.456, 0.406]
std = [0.229, 0.224, 0.225]
normalize = transforms.Normalize(mean=mean, std=std)
if args.aug == 'NULL' and args.dataset == 'imagenet':
train_transform = transforms.Compose([
transforms.RandomResizedCrop(image_size, scale=(args.crop, 1.)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
])
elif args.aug == 'CJ':
train_transform = transforms.Compose([
transforms.RandomResizedCrop(image_size, scale=(args.crop, 1.)),
transforms.RandomGrayscale(p=0.2),
transforms.ColorJitter(0.4, 0.4, 0.4, 0.4),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
])
# elif args.aug == 'NULL' and args.dataset == 'cifar':
# train_transform = transforms.Compose([
# transforms.RandomResizedCrop(size=32, scale=(0.2, 1.)),
# transforms.ColorJitter(0.4, 0.4, 0.4, 0.4),
# transforms.RandomGrayscale(p=0.2),
# transforms.RandomHorizontalFlip(p=0.5),
# transforms.ToTensor(),
# transforms.Normalize((0.4914, 0.4822, 0.4465), (0.2023, 0.1994, 0.2010)),
# ])
#
# test_transform = transforms.Compose([
# transforms.ToTensor(),
# transforms.Normalize((0.4914, 0.4822, 0.4465), (0.2023, 0.1994, 0.2010)),
# ])
elif args.aug == 'simple' and args.dataset == 'imagenet':
train_transform = transforms.Compose([
transforms.RandomResizedCrop(image_size, scale=(args.crop, 1.)),
transforms.RandomHorizontalFlip(),
get_color_distortion(1.0),
transforms.ToTensor(),
normalize,
])
# TODO: Currently follow CMC
test_transform = transforms.Compose([
transforms.Resize(image_size + crop_padding),
transforms.CenterCrop(image_size),
transforms.ToTensor(),
normalize,
])
elif args.aug == 'simple' and args.dataset == 'cifar':
train_transform = transforms.Compose([
transforms.RandomResizedCrop(size=32),
transforms.RandomHorizontalFlip(p=0.5),
get_color_distortion(0.5),
transforms.ToTensor(),
transforms.Normalize((0.4914, 0.4822, 0.4465),
(0.2023, 0.1994, 0.2010)),
])
test_transform = transforms.Compose([
transforms.ToTensor(),
transforms.Normalize((0.4914, 0.4822, 0.4465),
(0.2023, 0.1994, 0.2010)),
])
else:
raise NotImplemented('augmentation not supported: {}'.format(args.aug))
# Get Datasets
if args.dataset == "imagenet":
train_dataset = ImageFolderInstance(data_folder,
transform=train_transform,
two_crop=args.moco)
print(len(train_dataset))
train_sampler = None
train_loader = torch.utils.data.DataLoader(
train_dataset,
batch_size=args.batch_size,
shuffle=(train_sampler is None),
num_workers=args.num_workers,
pin_memory=True,
sampler=train_sampler)
test_dataset = datasets.ImageFolder(val_folder,
transforms=test_transform)
test_loader = torch.utils.data.DataLoader(test_dataset,
batch_size=256,
shuffle=False,
num_workers=args.num_workers,
pin_memory=True)
elif args.dataset == 'cifar':
# cifar-10 dataset
if args.contrastive_model == 'simclr':
train_dataset = CIFAR10Instance_double(root='./data',
train=True,
download=True,
transform=train_transform,
double=True)
else:
train_dataset = CIFAR10Instance(root='./data',
train=True,
download=True,
transform=train_transform)
train_sampler = None
train_loader = torch.utils.data.DataLoader(
train_dataset,
batch_size=args.batch_size,
shuffle=(train_sampler is None),
num_workers=args.num_workers,
pin_memory=True,
sampler=train_sampler,
drop_last=True)
test_dataset = CIFAR10Instance(root='./data',
train=False,
download=True,
transform=test_transform)
test_loader = torch.utils.data.DataLoader(test_dataset,
batch_size=100,
shuffle=False,
num_workers=args.num_workers)
# create model and optimizer
n_data = len(train_dataset)
if args.model == 'resnet50':
model = InsResNet50()
if args.contrastive_model == 'moco':
model_ema = InsResNet50()
elif args.model == 'resnet50x2':
model = InsResNet50(width=2)
if args.contrastive_model == 'moco':
model_ema = InsResNet50(width=2)
elif args.model == 'resnet50x4':
model = InsResNet50(width=4)
if args.contrastive_model == 'moco':
model_ema = InsResNet50(width=4)
elif args.model == 'resnet50_cifar':
model = InsResNet50_cifar()
if args.contrastive_model == 'moco':
model_ema = InsResNet50_cifar()
else:
raise NotImplementedError('model not supported {}'.format(args.model))
# copy weights from `model' to `model_ema'
if args.contrastive_model == 'moco':
moment_update(model, model_ema, 0)
# set the contrast memory and criterion
if args.contrastive_model == 'moco':
contrast = MemoryMoCo(128, n_data, args.nce_k, args.nce_t,
args.softmax).cuda(args.gpu)
elif args.contrastive_model == 'simclr':
contrast = None
else:
contrast = MemoryInsDis(128, n_data, args.nce_k, args.nce_t,
args.nce_m, args.softmax).cuda(args.gpu)
if args.softmax:
criterion = NCESoftmaxLoss()
elif args.contrastive_model == 'simclr':
criterion = BatchCriterion(1, args.nce_t, args.batch_size)
else:
criterion = NCECriterion(n_data)
criterion = criterion.cuda(args.gpu)
model = model.cuda()
if args.contrastive_model == 'moco':
model_ema = model_ema.cuda()
# Exclude BN and bias if needed
weight_decay = args.weight_decay
if weight_decay and args.filter_weight_decay:
parameters = add_weight_decay(model, weight_decay,
args.filter_weight_decay)
weight_decay = 0.
else:
parameters = model.parameters()
optimizer = torch.optim.SGD(parameters,
lr=args.learning_rate,
momentum=args.momentum,
weight_decay=weight_decay)
cudnn.benchmark = True
if args.amp:
model, optimizer = amp.initialize(model,
optimizer,
opt_level=args.opt_level)
if args.contrastive_model == 'moco':
optimizer_ema = torch.optim.SGD(model_ema.parameters(),
lr=0,
momentum=0,
weight_decay=0)
model_ema, optimizer_ema = amp.initialize(model_ema,
optimizer_ema,
opt_level=args.opt_level)
if args.LARS:
optimizer = LARS(optimizer=optimizer, eps=1e-8, trust_coef=0.001)
# optionally resume from a checkpoint
args.start_epoch = 0
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(args.resume, map_location='cpu')
# checkpoint = torch.load(args.resume)
args.start_epoch = checkpoint['epoch'] + 1
model.load_state_dict(checkpoint['model'])
optimizer.load_state_dict(checkpoint['optimizer'])
if contrast:
contrast.load_state_dict(checkpoint['contrast'])
if args.contrastive_model == 'moco':
model_ema.load_state_dict(checkpoint['model_ema'])
if args.amp and checkpoint['opt'].amp:
print('==> resuming amp state_dict')
amp.load_state_dict(checkpoint['amp'])
print("=> loaded successfully '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
del checkpoint
torch.cuda.empty_cache()
else:
print("=> no checkpoint found at '{}'".format(args.resume))
# tensorboard
logger = tb_logger.Logger(logdir=args.tb_folder, flush_secs=2)
# routine
for epoch in range(args.start_epoch, args.epochs + 1):
print("==> training...")
time1 = time.time()
if args.contrastive_model == 'moco':
loss, prob = train_moco(epoch, train_loader, model, model_ema,
contrast, criterion, optimizer, args)
elif args.contrastive_model == 'simclr':
print("Train using simclr")
loss, prob = train_simclr(epoch, train_loader, model, criterion,
optimizer, args)
else:
print("Train using InsDis")
loss, prob = train_ins(epoch, train_loader, model, contrast,
criterion, optimizer, args)
time2 = time.time()
print('epoch {}, total time {:.2f}'.format(epoch, time2 - time1))
# tensorboard logger
logger.log_value('ins_loss', loss, epoch)
logger.log_value('ins_prob', prob, epoch)
logger.log_value('learning_rate', optimizer.param_groups[0]['lr'],
epoch)
test_epoch = 2
if epoch % test_epoch == 0:
model.eval()
if args.contrastive_model == 'moco':
model_ema.eval()
print('----------Evaluation---------')
start = time.time()
if args.dataset == 'cifar':
acc = kNN(epoch,
model,
train_loader,
test_loader,
200,
args.nce_t,
n_data,
low_dim=128,
memory_bank=None)
print("Evaluation Time: '{}'s".format(time.time() - start))
# writer.add_scalar('nn_acc', acc, epoch)
logger.log_value('Test accuracy', acc, epoch)
# print('accuracy: {}% \t (best acc: {}%)'.format(acc, best_acc))
print('[Epoch]: {}'.format(epoch))
print('accuracy: {}%)'.format(acc))
# test_log_file.flush()
# save model
if epoch % args.save_freq == 0:
print('==> Saving...')
state = {
'opt': args,
'model': model.state_dict(),
# 'contrast': contrast.state_dict(),
'optimizer': optimizer.state_dict(),
'epoch': epoch,
}
if args.contrastive_model == 'moco':
state['model_ema'] = model_ema.state_dict()
if args.amp:
state['amp'] = amp.state_dict()
save_file = os.path.join(
args.model_folder,
'ckpt_epoch_{epoch}.pth'.format(epoch=epoch))
torch.save(state, save_file)
# help release GPU memory
del state
# saving the model
print('==> Saving...')
state = {
'opt': args,
'model': model.state_dict(),
# 'contrast': contrast.state_dict(),
'optimizer': optimizer.state_dict(),
'epoch': epoch,
}
if args.contrastive_model == 'moco':
state['model_ema'] = model_ema.state_dict()
if args.amp:
state['amp'] = amp.state_dict()
save_file = os.path.join(args.model_folder, 'current.pth')
torch.save(state, save_file)
if epoch % args.save_freq == 0:
save_file = os.path.join(
args.model_folder,
'ckpt_epoch_{epoch}.pth'.format(epoch=epoch))
torch.save(state, save_file)
# help release GPU memory
del state
torch.cuda.empty_cache()