def main():
global best_acc
start_epoch = args.start_epoch # start from epoch 0 or last checkpoint epoch
if not os.path.isdir(args.checkpoint):
mkdir_p(args.checkpoint)
# Data loading code
traindir = os.path.join(args.data, 'train')
valdir = os.path.join(args.data, 'valf')
normalize = transforms.Normalize(mean=[0.485, 0.456, 0.406],
std=[0.229, 0.224, 0.225])
data_aug_scale = (0.08, 1.0) if args.modelsize == 'large' else (0.2, 1.0)
train_loader = torch.utils.data.DataLoader(
datasets.ImageFolder(traindir, transforms.Compose([
transforms.RandomResizedCrop(224, scale = data_aug_scale),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
])),
batch_size=args.train_batch, shuffle=True,
num_workers=args.workers, pin_memory=True)
val_loader = torch.utils.data.DataLoader(
datasets.ImageFolder(valdir, transforms.Compose([
transforms.Scale(256),
transforms.CenterCrop(224),
transforms.ToTensor(),
normalize,
])),
batch_size=args.test_batch, shuffle=True,
num_workers=args.workers, pin_memory=True)
# create model
# if args.pretrained:
# print("=> using pre-trained model '{}'".format(args.arch))
# model = models.__dict__[args.arch](pretrained=True)
# elif 'resnext' in args.arch:
# model = models.__dict__[args.arch](
# baseWidth=args.base_width,
# cardinality=args.cardinality,
# )
# else:
# print("=> creating model '{}'".format(args.arch))
# model = models.__dict__[args.arch]()
model = se_resnet101().cuda()
flops, params = get_model_complexity_info(model, (224, 224), as_strings=False, print_per_layer_stat=False)
print('Flops: %.3f' % (flops / 1e9))
print('Params: %.2fM' % (params / 1e6))
model = torch.nn.DataParallel(model).cuda()
cudnn.benchmark = True
# define loss function (criterion) and optimizer
criterion = nn.CrossEntropyLoss().cuda()
optimizer = optim.SGD(model.parameters(), lr=args.lr, momentum=args.momentum, weight_decay=args.weight_decay)
# Resume
title = 'ImageNet-' + args.arch
if args.resume:
# Load checkpoint.
print('==> Resuming from checkpoint..', args.resume)
assert os.path.isfile(args.resume), 'Error: no checkpoint directory found!'
args.checkpoint = os.path.dirname(args.resume)
checkpoint = torch.load(args.resume)
best_acc = checkpoint['best_acc']
start_epoch = checkpoint['epoch']
# model may have more keys
t = model.state_dict()
c = checkpoint['state_dict']
flag = True
for k in t:
if k not in c:
print('not in loading dict! fill it', k, t[k])
c[k] = t[k]
flag = False
model.load_state_dict(c)
if flag:
print('optimizer load old state')
optimizer.load_state_dict(checkpoint['optimizer'])
else:
print('new optimizer !')
logger = Logger(os.path.join(args.checkpoint, 'log.txt'), title=title, resume=True)
else:
logger = Logger(os.path.join(args.checkpoint, 'log.txt'), title=title)
logger.set_names(['Learning Rate', 'Train Loss', 'Valid Loss', 'Train Acc.', 'Valid Acc.'])
if args.evaluate:
print('\nEvaluation only')
test_loss, test_acc = test(val_loader, model, criterion, start_epoch, use_cuda)
print(' Test Loss: %.8f, Test Acc: %.2f' % (test_loss, test_acc))
return
# Train and val
for epoch in range(start_epoch, args.epochs):
adjust_learning_rate(optimizer, epoch)
print('\nEpoch: [%d | %d] LR: %f' % (epoch + 1, args.epochs, state['lr']))
train_loss, train_acc = train(train_loader, model, criterion, optimizer, epoch, use_cuda)
test_loss, test_acc = test(val_loader, model, criterion, epoch, use_cuda)
# append logger file
logger.append([state['lr'], train_loss, test_loss, train_acc, test_acc])
# save model
is_best = test_acc > best_acc
best_acc = max(test_acc, best_acc)
save_checkpoint({
'epoch': epoch + 1,
'state_dict': model.state_dict(),
'acc': test_acc,
'best_acc': best_acc,
'optimizer' : optimizer.state_dict(),
}, is_best, checkpoint=args.checkpoint)
logger.close()
print('Best acc:')
print(best_acc)
def main():
global best_acc
start_epoch = args.start_epoch # start from epoch 0 or last checkpoint epoch
if not os.path.isdir(args.checkpoint) and args.local_rank == 0:
mkdir_p(args.checkpoint)
args.distributed = True
args.gpu = args.local_rank
torch.cuda.set_device(args.gpu)
torch.distributed.init_process_group(backend='nccl', init_method='env://')
args.world_size = torch.distributed.get_world_size()
print('world_size = ', args.world_size)
assert torch.backends.cudnn.enabled, "Amp requires cudnn backend to be enabled."
# create model
if args.pretrained:
print("=> using pre-trained model '{}'".format(args.arch))
model = models.__dict__[args.arch]()
elif 'resnext' in args.arch:
model = models.__dict__[args.arch](
baseWidth=args.base_width,
cardinality=args.cardinality,
)
else:
print("=> creating model '{}'".format(args.arch))
model = models.__dict__[args.arch]()
flops, params = get_model_complexity_info(model, (224, 224), as_strings=False, print_per_layer_stat=False)
print('Flops: %.3f' % (flops / 1e9))
print('Params: %.2fM' % (params / 1e6))
cudnn.benchmark = True
# define loss function (criterion) and optimizer
# criterion = nn.CrossEntropyLoss().cuda()
criterion = SoftCrossEntropyLoss(label_smoothing=args.label_smoothing).cuda()
model = model.cuda()
args.lr = float(0.1 * float(args.train_batch * args.world_size) / 256.)
state['lr'] = args.lr
optimizer = set_optimizer(model)
# optim.SGD(model.parameters(), lr=args.lr, momentum=args.momentum, weight_decay=args.weight_decay)
model, optimizer = amp.initialize(model, optimizer,
opt_level=args.opt_level,
keep_batchnorm_fp32=args.keep_batchnorm_fp32,
loss_scale=args.loss_scale)
# model = torch.nn.DataParallel(model).cuda()
# model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[args.local_rank], output_device=args.local_rank)
model = DDP(model, delay_allreduce=True)
# Data loading code
traindir = os.path.join(args.data, 'img_train')
valdir = os.path.join(args.data, 'img_val')
# normalize = transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225])
data_aug_scale = (0.08, 1.0)
train_dataset = datasets.ImageFolder(traindir, transforms.Compose([
transforms.RandomResizedCrop(224, scale=data_aug_scale),
transforms.RandomHorizontalFlip(),
# transforms.ToTensor(),
# normalize,
]))
val_dataset = datasets.ImageFolder(valdir, transforms.Compose([
transforms.Resize(256),
transforms.CenterCrop(224),
# transforms.ToTensor(),
# normalize,
]))
train_sampler = torch.utils.data.distributed.DistributedSampler(train_dataset)
val_sampler = torch.utils.data.distributed.DistributedSampler(val_dataset)
train_loader = torch.utils.data.DataLoader(
train_dataset, batch_size=args.train_batch, shuffle=False,
num_workers=args.workers, pin_memory=True, sampler=train_sampler, collate_fn=fast_collate)
val_loader = torch.utils.data.DataLoader(
val_dataset, batch_size=args.test_batch, shuffle=False,
num_workers=args.workers, pin_memory=True, sampler=val_sampler, collate_fn=fast_collate)
# Resume
title = 'ImageNet-' + args.arch
if args.resume:
# Load checkpoint.
print('==> Resuming from checkpoint..', args.resume)
assert os.path.isfile(args.resume), 'Error: no checkpoint directory found!'
args.checkpoint = os.path.dirname(args.resume)
checkpoint = torch.load(args.resume, map_location='cpu')
best_acc = checkpoint['best_acc']
start_epoch = checkpoint['epoch']
# model may have more keys
t = model.state_dict()
c = checkpoint['state_dict']
flag = True
for k in t:
if k not in c:
print('not in loading dict! fill it', k, t[k])
c[k] = t[k]
flag = False
model.load_state_dict(c)
print('new optimizer !')
if args.local_rank == 0:
logger = Logger(os.path.join(args.checkpoint, 'log.txt'), title=title, resume=True)
else:
if args.local_rank == 0:
logger = Logger(os.path.join(args.checkpoint, 'log.txt'), title=title)
logger.set_names(['Learning Rate', 'Train Loss', 'Valid Loss', 'Train Acc.', 'Valid Acc.'])
if args.evaluate:
print('\nEvaluation only')
test_loss, test_acc = test(val_loader, model, criterion, start_epoch, use_cuda)
print(' Test Loss: %.8f, Test Acc: %.2f' % (test_loss, test_acc))
return
# Train and val
for epoch in range(start_epoch, args.epochs):
train_sampler.set_epoch(epoch)
adjust_learning_rate(optimizer, epoch)
if args.local_rank == 0:
print('\nEpoch: [%d | %d] LR: %f' % (epoch + 1, args.epochs, state['lr']))
train_loss, train_acc = train(train_loader, model, criterion, optimizer, epoch, use_cuda)
test_loss, test_acc = test(val_loader, model, criterion, epoch, use_cuda)
# save model
if args.local_rank == 0:
# append logger file
logger.append([state['lr'], train_loss, test_loss, train_acc, test_acc])
is_best = test_acc > best_acc
best_acc = max(test_acc, best_acc)
save_checkpoint({
'epoch': epoch + 1,
'state_dict': model.state_dict(),
'acc': test_acc,
'best_acc': best_acc,
'optimizer': optimizer.state_dict(),
}, is_best, checkpoint=args.checkpoint)
if args.local_rank == 0:
logger.close()
print('Best acc:')
print(best_acc)