def train300_mlperf_coco(args):
args.distributed = args.world_size > 1
from coco import COCO
# Check that GPUs are actually available
use_cuda = not args.no_cuda and torch.cuda.is_available()
dboxes = dboxes300_coco()
encoder = Encoder(dboxes)
train_trans = SSDTransformer(dboxes, (300, 300), val=False)
val_trans = SSDTransformer(dboxes, (300, 300), val=True)
val_annotate = os.path.join(args.data,
"annotations/instances_val2017.json")
val_coco_root = os.path.join(args.data, "val2017")
train_annotate = os.path.join(args.data,
"annotations/instances_train2017.json")
train_coco_root = os.path.join(args.data, "train2017")
cocoGt = COCO(annotation_file=val_annotate)
val_coco = COCODetection(val_coco_root, val_annotate, val_trans)
train_coco = COCODetection(train_coco_root, train_annotate, train_trans)
if args.distributed:
train_sampler = torch.utils.data.distributed.DistributedSampler(
train_coco)
else:
train_sampler = None
train_dataloader = DataLoader(train_coco,
batch_size=args.batch_size,
shuffle=True,
num_workers=4,
sampler=train_sampler)
ssd300 = SSD300(train_coco.labelnum)
if args.checkpoint is not None:
print("loading model checkpoint", args.checkpoint)
od = torch.load(args.checkpoint)
ssd300.load_state_dict(od["model"])
ssd300.train()
if use_cuda:
ssd300.cuda()
loss_func = Loss(dboxes)
if use_cuda:
loss_func.cuda()
if args.distributed:
dist.init_process_group(backend=args.dist_backend,
init_method=args.dist_url,
world_size=args.world_size)
ssd300 = DistributedDataParallel(ssd300)
else:
ssd300 = torch.nn.DataParallel(ssd300)
optim = torch.optim.SGD(ssd300.parameters(),
lr=1e-3,
momentum=0.9,
weight_decay=5e-4)
print("epoch", "nbatch", "loss")
iter_num = args.iteration
avg_loss = 0.0
inv_map = {v: k for k, v in val_coco.label_map.items()}
for epoch in range(args.epochs):
for nbatch, (img, img_size, bbox,
label) in enumerate(train_dataloader):
start = time.time()
if iter_num == 160000:
print("")
print("lr decay step #1")
for param_group in optim.param_groups:
param_group['lr'] = 1e-4
if iter_num == 200000:
print("")
print("lr decay step #2")
for param_group in optim.param_groups:
param_group['lr'] = 1e-5
if use_cuda:
img = img.cuda()
img = Variable(img, requires_grad=True)
ploc, plabel = ssd300(img)
trans_bbox = bbox.transpose(1, 2).contiguous()
if use_cuda:
trans_bbox = trans_bbox.cuda()
label = label.cuda()
gloc, glabel = Variable(trans_bbox, requires_grad=False), \
Variable(label, requires_grad=False)
loss = loss_func(ploc, plabel, gloc, glabel)
if not np.isinf(loss.item()):
avg_loss = 0.999 * avg_loss + 0.001 * loss.item()
optim.zero_grad()
loss.backward()
optim.step()
end = time.time()
if nbatch % 10 == 0:
print("Iteration: {:6d}, Loss function: {:5.3f}, Average Loss: {:.3f}, Average time: {:.3f} secs"\
.format(iter_num, loss.item(), avg_loss, end - start))
if iter_num in args.evaluation:
if not args.no_save:
print("")
print("saving model...")
torch.save(
{
"model": ssd300.state_dict(),
"label_map": train_coco.label_info
}, "./models/iter_{}.pt".format(iter_num))
if coco_eval(ssd300, val_coco, cocoGt, encoder, inv_map,
args.threshold):
return
iter_num += 1
def main():
print("~~epoch\thours\ttop1Accuracy\n")
start_time = datetime.now()
args.distributed = args.world_size > 1
args.gpu = 0
if args.distributed:
args.gpu = args.rank % torch.cuda.device_count()
torch.cuda.set_device(args.gpu)
dist.init_process_group(backend=args.dist_backend,
init_method=args.dist_url,
world_size=args.world_size)
if args.fp16:
assert torch.backends.cudnn.enabled, "fp16 mode requires cudnn backend to be enabled."
# create model
if args.pretrained: model = models.__dict__[args.arch](pretrained=True)
else: model = models.__dict__[args.arch]()
model = model.cuda()
n_dev = torch.cuda.device_count()
if args.fp16: model = network_to_half(model)
if args.distributed: model = DDP(model)
elif args.dp:
model = nn.DataParallel(model)
args.batch_size *= n_dev
global param_copy
if args.fp16:
param_copy = [
param.clone().type(torch.cuda.FloatTensor).detach()
for param in model.parameters()
]
for param in param_copy:
param.requires_grad = True
else:
param_copy = list(model.parameters())
# define loss function (criterion) and optimizer
criterion = nn.CrossEntropyLoss().cuda()
optimizer = torch.optim.SGD(param_copy,
args.lr,
momentum=args.momentum,
weight_decay=args.weight_decay)
best_prec1 = 0
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
checkpoint = torch.load(
args.resume,
map_location=lambda storage, loc: storage.cuda(args.gpu))
args.start_epoch = checkpoint['epoch']
best_prec1 = checkpoint['best_prec1']
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
else:
print("=> no checkpoint found at '{}'".format(args.resume))
traindir = os.path.join(args.data, 'train')
valdir = os.path.join(args.data, 'val')
train_loader, val_loader, train_sampler = get_loaders(traindir, valdir)
if args.evaluate:
return validate(val_loader, model, criterion, epoch, start_time)
for epoch in range(args.start_epoch, args.epochs):
if args.distributed: train_sampler.set_epoch(epoch)
adjust_learning_rate(optimizer, epoch)
if epoch == args.epochs - 6:
args.sz = 288
args.batch_size = 128
train_loader, val_loader, train_sampler, val_sampler = get_loaders(
traindir, valdir, use_val_sampler=False, min_scale=0.5)
if args.distributed:
train_sampler.set_epoch(epoch)
val_sampler.set_epoch(epoch)
with warnings.catch_warnings():
warnings.simplefilter("ignore", category=UserWarning)
train(train_loader, model, criterion, optimizer, epoch)
if args.prof: break
prec1 = validate(val_loader, model, criterion, epoch, start_time)
if args.rank == 0:
is_best = prec1 > best_prec1
best_prec1 = max(prec1, best_prec1)
save_checkpoint(
{
'epoch': epoch + 1,
'arch': args.arch,
'state_dict': model.state_dict(),
'best_prec1': best_prec1,
'optimizer': optimizer.state_dict(),
}, is_best)
def main():
global best_prec1, args
args.distributed = args.world_size > 1
# args.gpu = 0
if args.distributed:
# args.gpu = args.rank % torch.cuda.device_count()
# torch.cuda.set_device(args.gpu)
dist.init_process_group(backend=args.dist_backend,
init_method=args.dist_url,
world_size=args.world_size,
rank=args.rank)
if args.fp16:
assert torch.backends.cudnn.enabled, "fp16 mode requires cudnn backend to be enabled."
# create model
if args.pretrained:
print("=> using pre-trained model '{}'".format(args.arch))
model = models.__dict__[args.arch](pretrained=True)
else:
print("=> creating model '{}'".format(args.arch))
model = models.__dict__[args.arch]()
model = model.cuda()
n_dev = torch.cuda.device_count()
if args.fp16: model = network_to_half(model)
if args.distributed:
model = DDP(model)
#args.lr *= n_dev
elif args.dp:
model = nn.DataParallel(model)
args.batch_size *= n_dev
#args.lr *= n_dev
global param_copy
if args.fp16:
param_copy = [
param.clone().type(torch.cuda.FloatTensor).detach()
for param in model.parameters()
]
for param in param_copy:
param.requires_grad = True
else:
param_copy = list(model.parameters())
# define loss function (criterion) and optimizer
criterion = nn.CrossEntropyLoss().cuda()
optimizer = torch.optim.SGD(param_copy,
args.lr,
momentum=args.momentum,
weight_decay=args.weight_decay)
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(
args.resume,
map_location=lambda storage, loc: storage.cuda(args.gpu))
args.start_epoch = checkpoint['epoch']
best_prec1 = checkpoint['best_prec1']
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
print("=> loaded checkpoint '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
else:
print("=> no checkpoint found at '{}'".format(args.resume))
# Data loading code
traindir = os.path.join(args.data, 'train')
valdir = os.path.join(args.data, 'val')
normalize = transforms.Normalize(mean=[0.485, 0.456, 0.406],
std=[0.229, 0.224, 0.225])
train_dataset = datasets.ImageFolder(
traindir,
transforms.Compose([
transforms.RandomResizedCrop(args.sz),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
]))
train_sampler = (
torch.utils.data.distributed.DistributedSampler(train_dataset)
if args.distributed else None)
train_loader = torch.utils.data.DataLoader(train_dataset,
batch_size=args.batch_size,
shuffle=(train_sampler is None),
num_workers=args.workers,
pin_memory=True,
sampler=train_sampler)
val_loader = torch.utils.data.DataLoader(datasets.ImageFolder(
valdir,
transforms.Compose([
transforms.Resize(int(args.sz * 1.14)),
transforms.CenterCrop(args.sz),
transforms.ToTensor(),
normalize,
])),
batch_size=args.batch_size,
shuffle=False,
num_workers=args.workers,
pin_memory=True)
if args.evaluate:
validate(val_loader, model, criterion)
return
for epoch in range(args.start_epoch, args.epochs):
if args.distributed: train_sampler.set_epoch(epoch)
adjust_learning_rate(optimizer, epoch)
# train for one epoch
train(train_loader, model, criterion, optimizer, epoch)
if args.prof: break
# evaluate on validation set
prec1 = validate(val_loader, model, criterion)
# remember best prec@1 and save checkpoint
if args.rank == 0:
is_best = prec1 > best_prec1
best_prec1 = max(prec1, best_prec1)
save_checkpoint(
{
'epoch': epoch + 1,
'arch': args.arch,
'state_dict': model.state_dict(),
'best_prec1': best_prec1,
'optimizer': optimizer.state_dict(),
}, is_best)
def main():
start_time = datetime.now()
args.distributed = True #args.world_size > 1
args.gpu = 0
if args.distributed:
import socket
args.gpu = args.rank % torch.cuda.device_count()
torch.cuda.set_device(args.gpu)
logger.info('| distributed init (rank {}): {}'.format(
args.rank, args.distributed_init_method))
dist.init_process_group(
backend=args.dist_backend,
init_method=args.distributed_init_method,
world_size=args.world_size,
rank=args.rank,
)
logger.info('| initialized host {} as rank {}'.format(
socket.gethostname(), args.rank))
#args.gpu = args.rank % torch.cuda.device_count()
#torch.cuda.set_device(args.gpu)
#logger.info('initializing...')
#dist.init_process_group(backend=args.dist_backend, init_method=args.dist_url, world_size=args.world_size)
#logger.info('initialized')
# create model
if args.pretrained: model = models.__dict__[args.arch](pretrained=True)
else:
model = models.__dict__[args.arch](
num_structured_layers=args.num_structured_layers,
structure_type=args.structure_type,
nblocks=args.nblocks,
param=args.param)
model = model.cuda()
n_dev = torch.cuda.device_count()
logger.info('Created model')
if args.distributed: model = DDP(model)
elif args.dp:
model = nn.DataParallel(model)
args.batch_size *= n_dev
logger.info('Set up data parallel')
global structured_params
global unstructured_params
structured_params = filter(
lambda p: hasattr(p, '_is_structured') and p._is_structured,
model.parameters())
unstructured_params = filter(
lambda p: not (hasattr(p, '_is_structured') and p._is_structured),
model.parameters())
# define loss function (criterion) and optimizer
criterion = nn.CrossEntropyLoss().cuda()
optimizer = torch.optim.SGD([{
'params': structured_params,
'weight_decay': 0.0
}, {
'params': unstructured_params
}],
args.lr,
momentum=args.momentum,
weight_decay=args.weight_decay)
logger.info('Created optimizer')
best_acc1 = 0
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
checkpoint = torch.load(
args.resume,
map_location=lambda storage, loc: storage.cuda(args.gpu))
args.start_epoch = checkpoint['epoch']
best_acc1 = checkpoint['best_acc1']
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
else:
logger.info("=> no checkpoint found at '{}'".format(args.resume))
if args.small:
traindir = os.path.join(args.data + '-sz/160', 'train')
valdir = os.path.join(args.data + '-sz/160', 'val')
args.sz = 128
else:
traindir = os.path.join(args.data, 'train')
valdir = os.path.join(args.data, 'val')
args.sz = 224
train_loader, val_loader, train_sampler, val_sampler = get_loaders(
traindir, valdir, use_val_sampler=True)
logger.info('Loaded data')
if args.evaluate:
return validate(val_loader, model, criterion, epoch, start_time)
logger.info(model)
logger.info('| model {}, criterion {}'.format(
args.arch, criterion.__class__.__name__))
logger.info('| num. model params: {} (num. trained: {})'.format(
sum(p.numel() for p in model.parameters()),
sum(p.numel() for p in model.parameters() if p.requires_grad),
))
for epoch in range(args.start_epoch, args.epochs):
logger.info(f'Epoch {epoch}')
adjust_learning_rate(optimizer, epoch)
if epoch == int(args.epochs * 0.4 + 0.5):
traindir = os.path.join(args.data, 'train')
valdir = os.path.join(args.data, 'val')
args.sz = 224
train_loader, val_loader, train_sampler, val_sampler = get_loaders(
traindir, valdir)
if epoch == int(args.epochs * 0.92 + 0.5):
args.sz = 288
args.batch_size = 128
train_loader, val_loader, train_sampler, val_sampler = get_loaders(
traindir, valdir, use_val_sampler=False, min_scale=0.5)
if args.distributed:
train_sampler.set_epoch(epoch)
val_sampler.set_epoch(epoch)
with warnings.catch_warnings():
warnings.simplefilter("ignore", category=UserWarning)
train(train_loader, model, criterion, optimizer, epoch)
if args.prof: break
acc1 = validate(val_loader, model, criterion, epoch, start_time)
if args.rank == 0:
is_best = acc1 > best_acc1
best_acc1 = max(acc1, best_acc1)
save_checkpoint(
{
'epoch': epoch + 1,
'arch': args.arch,
'state_dict': model.state_dict(),
'best_acc1': best_acc1,
'optimizer': optimizer.state_dict(),
}, is_best)
def main():
global best_prec1, args
args.distributed = args.world_size > 1
args.gpu = 0
if args.distributed:
args.gpu = args.rank % torch.cuda.device_count()
torch.cuda.set_device(args.gpu)
dist.init_process_group(backend=args.dist_backend, init_method=args.dist_url, world_size=args.world_size)
if args.fp16:
assert torch.backends.cudnn.enabled, "fp16 mode requires cudnn backend to be enabled."
# create model
if args.pretrained:
print("=> using pre-trained model '{}'".format(args.arch))
model = models.__dict__[args.arch](pretrained=True)
else:
print("=> creating model '{}'".format(args.arch))
model = models.__dict__[args.arch]()
model = model.cuda()
n_dev = torch.cuda.device_count()
if args.fp16: model = network_to_half(model)
if args.distributed:
model = DDP(model)
#args.lr *= n_dev
elif args.dp:
model = nn.DataParallel(model)
args.batch_size *= n_dev
#args.lr *= n_dev
global param_copy
if args.fp16:
param_copy = [param.clone().type(torch.cuda.FloatTensor).detach() for param in model.parameters()]
for param in param_copy: param.requires_grad = True
else: param_copy = list(model.parameters())
# define loss function (criterion) and optimizer
criterion = nn.CrossEntropyLoss().cuda()
optimizer = torch.optim.SGD(param_copy, args.lr, momentum=args.momentum, weight_decay=args.weight_decay)
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(args.resume, map_location = lambda storage, loc: storage.cuda(args.gpu))
args.start_epoch = checkpoint['epoch']
best_prec1 = checkpoint['best_prec1']
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
print("=> loaded checkpoint '{}' (epoch {})"
.format(args.resume, checkpoint['epoch']))
else: print("=> no checkpoint found at '{}'".format(args.resume))
# Data loading code
traindir = os.path.join(args.data, 'train')
valdir = os.path.join(args.data, 'val')
normalize = transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225])
train_dataset = datasets.ImageFolder(
traindir,
transforms.Compose([
transforms.RandomResizedCrop(args.sz),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
]))
train_sampler = (torch.utils.data.distributed.DistributedSampler(train_dataset)
if args.distributed else None)
train_loader = torch.utils.data.DataLoader(
train_dataset, batch_size=args.batch_size, shuffle=(train_sampler is None),
num_workers=args.workers, pin_memory=True, sampler=train_sampler)
val_loader = torch.utils.data.DataLoader(
datasets.ImageFolder(valdir, transforms.Compose([
transforms.Resize(int(args.sz*1.14)),
transforms.CenterCrop(args.sz),
transforms.ToTensor(),
normalize,
])),
batch_size=args.batch_size, shuffle=False,
num_workers=args.workers, pin_memory=True)
if args.evaluate:
validate(val_loader, model, criterion)
return
for epoch in range(args.start_epoch, args.epochs):
if args.distributed: train_sampler.set_epoch(epoch)
adjust_learning_rate(optimizer, epoch)
# train for one epoch
train(train_loader, model, criterion, optimizer, epoch)
if args.prof: break
# evaluate on validation set
prec1 = validate(val_loader, model, criterion)
# remember best prec@1 and save checkpoint
if args.rank == 0:
is_best = prec1 > best_prec1
best_prec1 = max(prec1, best_prec1)
save_checkpoint({
'epoch': epoch + 1,
'arch': args.arch,
'state_dict': model.state_dict(),
'best_prec1': best_prec1,
'optimizer' : optimizer.state_dict(),
}, is_best)
def main():
global args, best_prec1
args = parser.parse_args()
args.cuda = not args.no_cuda and torch.cuda.is_available()
args.distributed = args.world_size > 1
if args.distributed:
dist.init_process_group(backend=args.dist_backend,
init_method=args.dist_url,
world_size=args.world_size)
# create model
if args.pretrained:
print("=> using pre-trained model '{}'".format(args.arch))
model = models.__dict__[args.arch](pretrained=True)
else:
print("=> creating model '{}'".format(args.arch))
model = models.__dict__[args.arch]()
if not args.distributed and args.cuda:
if args.arch.startswith('alexnet') or args.arch.startswith('vgg'):
model.features = torch.nn.DataParallel(model.features)
else:
model = torch.nn.DataParallel(model)
elif args.distributed:
model = DistributedDataParallel(model)
# define loss function (criterion) and optimizer
criterion = nn.CrossEntropyLoss()
optimizer = torch.optim.SGD(model.parameters(),
args.lr,
momentum=args.momentum,
weight_decay=args.weight_decay)
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(args.resume)
args.start_epoch = checkpoint['epoch']
best_prec1 = checkpoint['best_prec1']
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
print("=> loaded checkpoint '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
else:
print("=> no checkpoint found at '{}'".format(args.resume))
cudnn.benchmark = True
# Data loading code
traindir = os.path.join(args.data, 'train')
valdir = os.path.join(args.data, 'val')
normalize = transforms.Normalize(mean=[0.485, 0.456, 0.406],
std=[0.229, 0.224, 0.225])
train_dataset = datasets.ImageFolder(
traindir,
transforms.Compose([
transforms.RandomResizedCrop(224),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
]))
if args.distributed:
train_sampler = torch.utils.data.distributed.DistributedSampler(
train_dataset)
else:
train_sampler = None
train_loader = torch.utils.data.DataLoader(train_dataset,
batch_size=args.batch_size,
shuffle=(train_sampler is None),
num_workers=args.workers,
sampler=train_sampler)
val_loader = torch.utils.data.DataLoader(datasets.ImageFolder(
valdir,
transforms.Compose([
transforms.Resize(256),
transforms.CenterCrop(224),
transforms.ToTensor(),
normalize,
])),
batch_size=args.batch_size,
shuffle=False,
num_workers=args.workers)
if args.evaluate:
validate(val_loader, model, criterion)
return
for epoch in range(args.start_epoch, args.epochs):
if args.distributed:
train_sampler.set_epoch(epoch)
adjust_learning_rate(optimizer, epoch)
# train for one epoch
train(train_loader, model, criterion, optimizer, epoch)
# evaluate on validation set
prec1 = validate(val_loader, model, criterion)
# remember best prec@1 and save checkpoint
is_best = prec1 > best_prec1
best_prec1 = max(prec1, best_prec1)
"""
def main():
global args, folder_save
args = parser.parse_args()
args.distributed = args.world_size > 1
args.gpu = 0
if args.distributed:
args.gpu = args.rank % torch.cuda.device_count()
print(args)
opts = vars(args)
name_log = ''.join('{}{}-'.format(key, val)
for key, val in sorted(opts.items())
if key is not 'rank')
name_log = name_log.replace('/', '-')
name_log = name_log.replace('[', '-')
name_log = name_log.replace(']', '-')
name_log_list = list(map(''.join, zip(*[iter(name_log)] * 100)))
print(name_log_list, '\n')
folder_save = args.save_folder
for i in range(len(name_log_list)):
folder_save = os.path.join(folder_save, name_log_list[i])
if not os.path.isdir(folder_save):
os.mkdir(folder_save)
print('This will be saved in: ' + folder_save, '\n')
args.bottleneck_width = json.loads(args.bottleneck_width)
args.bottleneck_depth = json.loads(args.bottleneck_depth)
if args.distributed:
torch.cuda.set_device(args.rank % torch.cuda.device_count())
torch.cuda.set_device(args.gpu)
global best_prec1
global scat
scat = Scattering(M=224, N=224, J=args.J, pre_pad=False).cuda()
def save_checkpoint(state,
is_best,
filename=os.path.join(folder_save,
'checkpoint.pth.tar')):
torch.save(state, filename)
if is_best:
shutil.copyfile(filename,
os.path.join(folder_save, 'model_best.pth.tar'))
if args.distributed:
dist.init_process_group(backend=args.dist_backend,
init_method=args.dist_url,
world_size=args.world_size)
# create model
model = models.__dict__[args.arch](224,
args.J,
width=args.bottleneck_width,
depth=args.bottleneck_depth,
conv1x1=args.bottleneck_conv1x1)
model.cuda()
model_parameters = filter(lambda p: p.requires_grad, model.parameters())
params = sum([np.prod(p.size()) for p in model_parameters])
print('Number of parameters: %d' % params)
#### MODIFIED by Edouard
save_checkpoint(
{
'epoch': -1,
'arch': args.arch,
'state_dict': model.state_dict(),
'best_prec1': 0,
}, False)
if args.distributed:
model = DDP(model)
# define loss function (criterion) and optimizer
criterion = nn.CrossEntropyLoss().cuda()
optimizer = torch.optim.SGD(model.parameters(),
args.lr,
momentum=args.momentum,
weight_decay=args.weight_decay)
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
# checkpoint = torch.load(args.resume)
checkpoint = torch.load(
args.resume,
map_location=lambda storage, loc: storage.cuda(args.gpu))
args.start_epoch = checkpoint['epoch']
best_prec1 = checkpoint['best_prec1']
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
print("=> loaded checkpoint '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
else:
print("=> no checkpoint found at '{}'".format(args.resume))
cudnn.benchmark = True
# Data loading code
traindir = os.path.join(args.data, 'train')
valdir = os.path.join(args.data, 'val')
normalize = transforms.Normalize(mean=[0.485, 0.456, 0.406],
std=[0.229, 0.224, 0.225])
train_dataset = datasets.ImageFolder(
traindir,
transforms.Compose([
transforms.RandomResizedCrop(224),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
normalize,
]))
if args.distributed:
train_sampler = torch.utils.data.distributed.DistributedSampler(
train_dataset)
else:
train_sampler = None
train_loader = torch.utils.data.DataLoader(train_dataset,
batch_size=args.batch_size,
shuffle=(train_sampler is None),
num_workers=args.workers,
pin_memory=True,
sampler=train_sampler)
val_loader = torch.utils.data.DataLoader(datasets.ImageFolder(
valdir,
transforms.Compose([
transforms.Resize(256),
transforms.CenterCrop(224),
transforms.ToTensor(),
normalize,
])),
batch_size=args.batch_size,
shuffle=False,
num_workers=args.workers,
pin_memory=True)
if args.evaluate:
validate(val_loader, model, criterion)
return
for epoch in range(args.start_epoch, args.epochs):
if args.distributed:
train_sampler.set_epoch(epoch)
adjust_learning_rate(optimizer, epoch)
# train for one epoch
train(train_loader, model, criterion, optimizer, epoch)
# evaluate on validation set
prec1 = validate(val_loader, model, criterion)
# remember best prec@1 and save checkpoint
is_best = prec1 > best_prec1
best_prec1 = max(prec1, best_prec1)
save_checkpoint(
{
'epoch': epoch + 1,
'arch': args.arch,
'state_dict': model.state_dict(),
'best_prec1': best_prec1,
'optimizer': optimizer.state_dict(),
}, is_best)