dropRate=drop_rate)
model = model.cuda()
criterion = nn.CrossEntropyLoss().cuda()
optimizer = torch.optim.SGD(model.parameters(),
lr=learning_rate,
momentum=0.9,
nesterov=True,
weight_decay=0.0005)
scheduler = MultiStepLR(optimizer, milestones=LR_MILESTONES, gamma=gamma)
try:
checkpoint_fpath = 'cifar-10/cifar10_wideresnet79.pt'
checkpoint = torch.load(checkpoint_fpath)
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
scheduler = MultiStepLR(optimizer,
milestones=LR_MILESTONES,
gamma=0.2,
last_epoch=checkpoint['epoch'])
begin = checkpoint['epoch']
# print('test_acc :', checkpoint['test_acc'], 'train_acc :', checkpoint['train_acc'])
# print('last_lr :', checkpoint['scheduler']['_last_lr'])
except FileNotFoundError:
# print('starting over..')
begin = -1
best_acc = 0
for epoch in range(epochs):
if epoch <= begin:
def main(args):
np.random.seed(0)
torch.manual_seed(0)
torch.backends.cudnn.deterministic = True
torch.backends.cudnn.benchmark = False
# Constructing Model
if args.resume != "":
if os.path.isfile(args.resume):
print("=> Loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(args.resume, map_location='cpu')
test_only = args.test_only
resume = args.resume
args = checkpoint["opt"]
args.test_only = test_only
args.resume = resume
else:
checkpoint = None
print("=> No checkpoint found at '{}'".format(args.resume))
model = WideResNet(args.depth, args.widen_factor, args.dropout_rate,
args.num_classes)
if torch.cuda.is_available():
model.cuda()
model = torch.nn.DataParallel(model, device_ids=args.gpu)
if args.resume != "":
model.load_state_dict(checkpoint["model"])
args.start_epoch = checkpoint["epoch"] + 1
print("=> Loaded successfully '{}' (epoch {})".format(
args.resume, checkpoint["epoch"]))
del checkpoint
torch.cuda.empty_cache()
else:
model.apply(conv_init)
# Loading Dataset
if args.augment == "meanstd":
transform_train = transforms.Compose([
transforms.RandomCrop(32, padding=4),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize(Config.CIFAR10_mean, Config.CIFAR10_std),
])
transform_test = transforms.Compose([
transforms.ToTensor(),
transforms.Normalize(Config.CIFAR10_mean, Config.CIFAR10_std),
])
elif args.augment == "zac":
# To Do: ZCA whitening
pass
else:
raise NotImplementedError
print("| Preparing CIFAR-10 dataset...")
sys.stdout.write("| ")
trainset = CIFAR10(root="./data",
train=True,
download=True,
transform=transform_train)
testset = CIFAR10(root="./data",
train=False,
download=False,
transform=transform_test)
train_loader = DataLoader(trainset,
batch_size=args.batch_size,
shuffle=True,
num_workers=2)
test_loader = DataLoader(testset,
batch_size=args.batch_size,
shuffle=False,
num_workers=2)
# Test only
if args.test_only:
if args.resume != "":
test(args, test_loader, model)
sys.exit(0)
else:
print("=> Test only model need to resume from a checkpoint")
raise RuntimeError
train(args, train_loader, test_loader, model)
test(args, test_loader, model)
def experiment():
parser = argparse.ArgumentParser(description='CNN Hyperparameter Fine-tuning')
parser.add_argument('--dataset', default='cifar10', choices=['cifar10', 'cifar100'],
help='Choose a dataset')
parser.add_argument('--model', default='resnet18', choices=['resnet18', 'wideresnet'],
help='Choose a model')
parser.add_argument('--num_finetune_epochs', type=int, default=200,
help='Number of fine-tuning epochs')
parser.add_argument('--lr', type=float, default=0.1,
help='Learning rate')
parser.add_argument('--optimizer', type=str, default='sgdm',
help='Choose an optimizer')
parser.add_argument('--batch_size', type=int, default=128,
help='Mini-batch size')
parser.add_argument('--data_augmentation', action='store_true', default=True,
help='Whether to use data augmentation')
parser.add_argument('--wdecay', type=float, default=5e-4,
help='Amount of weight decay')
parser.add_argument('--load_checkpoint', type=str,
help='Path to pre-trained checkpoint to load and finetune')
parser.add_argument('--save_dir', type=str, default='finetuned_checkpoints',
help='Save directory for the fine-tuned checkpoint')
args = parser.parse_args()
args.load_checkpoint = '/h/lorraine/PycharmProjects/CG_IFT_test/baseline_checkpoints/cifar10_resnet18_sgdm_lr0.1_wd0.0005_aug0.pt'
if args.dataset == 'cifar10':
num_classes = 10
train_loader, val_loader, test_loader = data_loaders.load_cifar10(args.batch_size, val_split=True,
augmentation=args.data_augmentation)
elif args.dataset == 'cifar100':
num_classes = 100
train_loader, val_loader, test_loader = data_loaders.load_cifar100(args.batch_size, val_split=True,
augmentation=args.data_augmentation)
if args.model == 'resnet18':
cnn = ResNet18(num_classes=num_classes)
elif args.model == 'wideresnet':
cnn = WideResNet(depth=28, num_classes=num_classes, widen_factor=10, dropRate=0.3)
if not os.path.exists(args.save_dir):
os.makedirs(args.save_dir)
test_id = '{}_{}_{}_lr{}_wd{}_aug{}'.format(args.dataset, args.model, args.optimizer, args.lr, args.wdecay,
int(args.data_augmentation))
filename = os.path.join(args.save_dir, test_id + '.csv')
csv_logger = CSVLogger(
fieldnames=['epoch', 'train_loss', 'train_acc', 'val_loss', 'val_acc', 'test_loss', 'test_acc'],
filename=filename)
checkpoint = torch.load(args.load_checkpoint)
init_epoch = checkpoint['epoch']
cnn.load_state_dict(checkpoint['model_state_dict'])
model = cnn.cuda()
model.train()
args.hyper_train = 'augment' # 'all_weight' # 'weight'
def init_hyper_train(model):
"""
:return:
"""
init_hyper = None
if args.hyper_train == 'weight':
init_hyper = np.sqrt(args.wdecay)
model.weight_decay = Variable(torch.FloatTensor([init_hyper]).cuda(), requires_grad=True)
model.weight_decay = model.weight_decay.cuda()
elif args.hyper_train == 'all_weight':
num_p = sum(p.numel() for p in model.parameters())
weights = np.ones(num_p) * np.sqrt(args.wdecay)
model.weight_decay = Variable(torch.FloatTensor(weights).cuda(), requires_grad=True)
model.weight_decay = model.weight_decay.cuda()
model = model.cuda()
return init_hyper
if args.hyper_train == 'augment': # Dont do inside the prior function, else scope is wrong
augment_net = UNet(in_channels=3,
n_classes=3,
depth=5,
wf=6,
padding=True,
batch_norm=False,
up_mode='upconv') # TODO(PV): Initialize UNet properly
augment_net = augment_net.cuda()
def get_hyper_train():
"""
:return:
"""
if args.hyper_train == 'weight' or args.hyper_train == 'all_weight':
return [model.weight_decay]
if args.hyper_train == 'augment':
return augment_net.parameters()
def get_hyper_train_flat():
return torch.cat([p.view(-1) for p in get_hyper_train()])
# TODO: Check this size
init_hyper_train(model)
if args.hyper_train == 'all_weight':
wdecay = 0.0
else:
wdecay = args.wdecay
optimizer = optim.SGD(model.parameters(), lr=args.lr * 0.2 * 0.2, momentum=0.9, nesterov=True,
weight_decay=wdecay) # args.wdecay)
# print(checkpoint['optimizer_state_dict'])
# optimizer.load_state_dict(checkpoint['optimizer_state_dict'])
scheduler = MultiStepLR(optimizer, milestones=[60, 120], gamma=0.2) # [60, 120, 160]
hyper_optimizer = torch.optim.Adam(get_hyper_train(), lr=1e-3) # try 0.1 as lr
# Set random regularization hyperparameters
# data_augmentation_hparams = {} # Random values for hue, saturation, brightness, contrast, rotation, etc.
if args.dataset == 'cifar10':
num_classes = 10
train_loader, val_loader, test_loader = data_loaders.load_cifar10(args.batch_size, val_split=True,
augmentation=args.data_augmentation)
elif args.dataset == 'cifar100':
num_classes = 100
train_loader, val_loader, test_loader = data_loaders.load_cifar100(args.batch_size, val_split=True,
augmentation=args.data_augmentation)
def test(loader):
model.eval() # Change model to 'eval' mode (BN uses moving mean/var).
correct = 0.
total = 0.
losses = []
for images, labels in loader:
images = images.cuda()
labels = labels.cuda()
with torch.no_grad():
pred = model(images)
xentropy_loss = F.cross_entropy(pred, labels)
losses.append(xentropy_loss.item())
pred = torch.max(pred.data, 1)[1]
total += labels.size(0)
correct += (pred == labels).sum().item()
avg_loss = float(np.mean(losses))
acc = correct / total
model.train()
return avg_loss, acc
def prepare_data(x, y):
"""
:param x:
:param y:
:return:
"""
x, y = x.cuda(), y.cuda()
# x, y = Variable(x), Variable(y)
return x, y
def train_loss_func(x, y):
"""
:param x:
:param y:
:return:
"""
x, y = prepare_data(x, y)
reg_loss = 0.0
if args.hyper_train == 'weight':
pred = model(x)
xentropy_loss = F.cross_entropy(pred, y)
# print(f"weight_decay: {torch.exp(model.weight_decay).shape}")
for p in model.parameters():
# print(f"weight_decay: {torch.exp(model.weight_decay).shape}")
# print(f"shape: {p.shape}")
reg_loss = reg_loss + .5 * (model.weight_decay ** 2) * torch.sum(p ** 2)
# print(f"reg_loss: {reg_loss}")
elif args.hyper_train == 'all_weight':
pred = model(x)
xentropy_loss = F.cross_entropy(pred, y)
count = 0
for p in model.parameters():
reg_loss = reg_loss + .5 * torch.sum(
(model.weight_decay[count: count + p.numel()] ** 2) * torch.flatten(p ** 2))
count += p.numel()
elif args.hyper_train == 'augment':
augmented_x = augment_net(x)
pred = model(augmented_x)
xentropy_loss = F.cross_entropy(pred, y)
return xentropy_loss + reg_loss, pred
def val_loss_func(x, y):
"""
:param x:
:param y:
:return:
"""
x, y = prepare_data(x, y)
pred = model(x)
xentropy_loss = F.cross_entropy(pred, y)
return xentropy_loss
for epoch in range(init_epoch, init_epoch + args.num_finetune_epochs):
xentropy_loss_avg = 0.
total_val_loss = 0.
correct = 0.
total = 0.
progress_bar = tqdm(train_loader)
for i, (images, labels) in enumerate(progress_bar):
progress_bar.set_description('Finetune Epoch ' + str(epoch))
# TODO: Take a hyperparameter step here
optimizer.zero_grad(), hyper_optimizer.zero_grad()
val_loss, weight_norm, grad_norm = hyper_step(1, 1, get_hyper_train, get_hyper_train_flat,
model, val_loss_func,
val_loader, train_loss_func, train_loader,
hyper_optimizer)
# del val_loss
# print(f"hyper: {get_hyper_train()}")
images, labels = images.cuda(), labels.cuda()
# pred = model(images)
# xentropy_loss = F.cross_entropy(pred, labels)
xentropy_loss, pred = train_loss_func(images, labels)
optimizer.zero_grad(), hyper_optimizer.zero_grad()
xentropy_loss.backward()
optimizer.step()
xentropy_loss_avg += xentropy_loss.item()
# Calculate running average of accuracy
pred = torch.max(pred.data, 1)[1]
total += labels.size(0)
correct += (pred == labels.data).sum().item()
accuracy = correct / total
progress_bar.set_postfix(
train='%.5f' % (xentropy_loss_avg / (i + 1)),
val='%.4f' % (total_val_loss / (i + 1)),
acc='%.4f' % accuracy,
weight='%.2f' % weight_norm,
update='%.3f' % grad_norm)
val_loss, val_acc = test(val_loader)
test_loss, test_acc = test(test_loader)
tqdm.write('val loss: {:6.4f} | val acc: {:6.4f} | test loss: {:6.4f} | test_acc: {:6.4f}'.format(
val_loss, val_acc, test_loss, test_acc))
scheduler.step(epoch)
row = {'epoch': str(epoch),
'train_loss': str(xentropy_loss_avg / (i + 1)), 'train_acc': str(accuracy),
'val_loss': str(val_loss), 'val_acc': str(val_acc),
'test_loss': str(test_loss), 'test_acc': str(test_acc)}
csv_logger.writerow(row)
