def get_omniglot(ways, shots):
omniglot = l2l.vision.datasets.FullOmniglot(root='~/data',
transform=transforms.Compose([
transforms.Resize(
28,
interpolation=LANCZOS),
transforms.ToTensor(),
lambda x: 1.0 - x,
]),
download=True)
dataset = l2l.data.MetaDataset(omniglot)
classes = list(range(1623))
random.shuffle(classes)
train_transforms = [
FilterLabels(dataset, classes[:1100]),
NWays(dataset, ways),
KShots(dataset, 2 * shots),
LoadData(dataset),
RemapLabels(dataset),
ConsecutiveLabels(dataset),
RandomClassRotation(dataset, [0.0, 90.0, 180.0, 270.0])
]
train_tasks = l2l.data.TaskDataset(dataset,
task_transforms=train_transforms,
num_tasks=20000)
valid_transforms = [
FilterLabels(dataset, classes[1100:1200]),
NWays(dataset, ways),
KShots(dataset, 2 * shots),
LoadData(dataset),
RemapLabels(dataset),
ConsecutiveLabels(dataset),
RandomClassRotation(dataset, [0.0, 90.0, 180.0, 270.0])
]
valid_tasks = l2l.data.TaskDataset(dataset,
task_transforms=valid_transforms,
num_tasks=1024)
test_transforms = [
FilterLabels(dataset, classes[1200:]),
NWays(dataset, ways),
KShots(dataset, 2 * shots),
LoadData(dataset),
RemapLabels(dataset),
ConsecutiveLabels(dataset),
RandomClassRotation(dataset, [0.0, 90.0, 180.0, 270.0])
]
test_tasks = l2l.data.TaskDataset(dataset,
task_transforms=test_transforms,
num_tasks=1024)
return train_tasks, valid_tasks, test_tasks
def fc100_tasksets(
train_ways=5,
train_samples=10,
test_ways=5,
test_samples=10,
root='~/data',
**kwargs,
):
"""Tasksets for FC100 benchmarks."""
data_transform = tv.transforms.ToTensor()
train_dataset = l2l.vision.datasets.FC100(root=root,
transform=data_transform,
mode='train',
download=True)
valid_dataset = l2l.vision.datasets.FC100(root=root,
transform=data_transform,
mode='validation',
download=True)
test_dataset = l2l.vision.datasets.FC100(root=root,
transform=data_transform,
mode='test',
download=True)
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, train_ways),
KShots(train_dataset, train_samples),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
valid_transforms = [
NWays(valid_dataset, test_ways),
KShots(valid_dataset, test_samples),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
test_transforms = [
NWays(test_dataset, test_ways),
KShots(test_dataset, test_samples),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
_datasets = (train_dataset, valid_dataset, test_dataset)
_transforms = (train_transforms, valid_transforms, test_transforms)
return _datasets, _transforms
def get_mini_imagenet(ways, shots):
# Create Datasets
train_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='train',
download=True)
valid_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='validation',
download=True)
test_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='test',
download=True)
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, ways),
KShots(train_dataset, 2 * shots),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms,
num_tasks=20000)
valid_transforms = [
NWays(valid_dataset, ways),
KShots(valid_dataset, 2 * shots),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
num_tasks=600)
test_transforms = [
NWays(test_dataset, ways),
KShots(test_dataset, 2 * shots),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
test_tasks = l2l.data.TaskDataset(test_dataset,
task_transforms=test_transforms,
num_tasks=600)
return train_tasks, valid_tasks, test_tasks
def mini_imagenet_tasksets(
train_ways=5,
train_samples=10,
test_ways=5,
test_samples=10,
root='~/data',
**kwargs,
):
"""Tasksets for mini-ImageNet benchmarks."""
train_dataset = l2l.vision.datasets.MiniImagenet(root=root,
mode='train',
download=True)
valid_dataset = l2l.vision.datasets.MiniImagenet(root=root,
mode='validation',
download=True)
test_dataset = l2l.vision.datasets.MiniImagenet(root=root,
mode='test',
download=True)
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, train_ways),
KShots(train_dataset, train_samples),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
valid_transforms = [
NWays(valid_dataset, test_ways),
KShots(valid_dataset, test_samples),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
test_transforms = [
NWays(test_dataset, test_ways),
KShots(test_dataset, test_samples),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
_datasets = (train_dataset, valid_dataset, test_dataset)
_transforms = (train_transforms, valid_transforms, test_transforms)
return _datasets, _transforms
def test_remap_labels(self):
data = torch.randn(NUM_DATA, X_SHAPE)
labels = torch.randint(0, Y_SHAPE, (NUM_DATA, ))
dataset = MetaDataset(TensorDataset(data, labels))
for ways in range(1, 5):
task_dataset = TaskDataset(dataset,
task_transforms=[
NWays(dataset, ways),
LoadData(dataset),
RemapLabels(dataset)
],
num_tasks=NUM_TASKS)
for task in task_dataset:
for label in range(ways):
self.assertTrue(label in task[1])
def tiered_imagenet_tasksets(
train_ways=5,
train_samples=10,
test_ways=5,
test_samples=10,
root='~/data',
data_augmentation=None,
device=None,
**kwargs,
):
"""Tasksets for tiered-ImageNet benchmarks."""
if data_augmentation is None:
to_tensor = ToTensor() if device is None else lambda x: x
train_data_transforms = Compose([
to_tensor,
])
test_data_transforms = train_data_transforms
elif data_augmentation == 'normalize':
to_tensor = ToTensor() if device is None else lambda x: x
train_data_transforms = Compose([
to_tensor,
])
test_data_transforms = train_data_transforms
elif data_augmentation == 'lee2019':
normalize = Normalize(
mean=[120.39586422/255.0, 115.59361427/255.0, 104.54012653/255.0],
std=[70.68188272/255.0, 68.27635443/255.0, 72.54505529/255.0],
)
to_pil = ToPILImage() if device is not None else lambda x: x
to_tensor = ToTensor() if device is None else lambda x: x
train_data_transforms = Compose([
to_pil,
RandomCrop(84, padding=8),
ColorJitter(brightness=0.4, contrast=0.4, saturation=0.4),
RandomHorizontalFlip(),
ToTensor(),
normalize,
])
test_data_transforms = Compose([
to_tensor,
normalize,
])
else:
raise('Invalid data_augmentation argument.')
train_dataset = l2l.vision.datasets.TieredImagenet(
root=root,
mode='train',
transform=ToTensor(),
download=True,
)
valid_dataset = l2l.vision.datasets.TieredImagenet(
root=root,
mode='validation',
transform=ToTensor(),
download=True,
)
test_dataset = l2l.vision.datasets.TieredImagenet(
root=root,
mode='test',
transform=ToTensor(),
download=True,
)
if device is None:
train_dataset.transform = train_data_transforms
valid_dataset.transform = test_data_transforms
test_dataset.transform = test_data_transforms
else:
train_dataset = l2l.data.OnDeviceDataset(
dataset=train_dataset,
transform=train_data_transforms,
device=device,
)
valid_dataset = l2l.data.OnDeviceDataset(
dataset=valid_dataset,
transform=test_data_transforms,
device=device,
)
test_dataset = l2l.data.OnDeviceDataset(
dataset=test_dataset,
transform=test_data_transforms,
device=device,
)
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, train_ways),
KShots(train_dataset, train_samples),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
valid_transforms = [
NWays(valid_dataset, test_ways),
KShots(valid_dataset, test_samples),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
test_transforms = [
NWays(test_dataset, test_ways),
KShots(test_dataset, test_samples),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
_datasets = (train_dataset, valid_dataset, test_dataset)
_transforms = (train_transforms, valid_transforms, test_transforms)
return _datasets, _transforms
train_dataset = meta_curetsr_lvl0
valid_dataset = meta_curetsr_lvl0
test_dataset = meta_curetsr_lvl5
classes = list(range(14)) # 14 classes of stop signs
random.shuffle(classes)
# Changes, end!
train_dataset = l2l.data.MetaDataset(train_dataset)
train_transforms = [
FilterLabels(train_dataset, classes[:8]),
NWays(train_dataset, args.train_way),
KShots(train_dataset, args.train_query + args.shot),
LoadData(train_dataset),
RemapLabels(train_dataset),
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms)
train_loader = DataLoader(train_tasks, pin_memory=True, shuffle=True)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
valid_transforms = [
FilterLabels(valid_dataset, classes[8:14]),
NWays(valid_dataset, args.test_way),
KShots(valid_dataset, args.test_query + args.test_shot),
LoadData(valid_dataset),
RemapLabels(valid_dataset),
]
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
def main(
ways=5,
train_shots=15,
test_shots=5,
meta_lr=1.0,
meta_mom=0.0,
meta_bsz=5,
fast_lr=0.001,
train_bsz=10,
test_bsz=15,
train_adapt_steps=8,
test_adapt_steps=50,
num_iterations=100000,
test_interval=100,
adam=0, # Use adam or sgd for fast-adapt
meta_decay=1, # Linearly decay the meta-lr or not
cuda=1,
seed=42,
):
cuda = bool(cuda)
use_adam = bool(adam)
meta_decay = bool(meta_decay)
random.seed(seed)
np.random.seed(seed)
torch.manual_seed(seed)
device = torch.device('cpu')
if cuda and torch.cuda.device_count():
torch.cuda.manual_seed(seed)
device = torch.device('cuda')
# Create Datasets
train_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='train')
valid_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='validation')
test_dataset = l2l.vision.datasets.MiniImagenet(root='~/data', mode='test')
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, ways),
KShots(train_dataset, 2 * train_shots),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms,
num_tasks=20000)
valid_transforms = [
NWays(valid_dataset, ways),
KShots(valid_dataset, 2 * test_shots),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
num_tasks=600)
test_transforms = [
NWays(test_dataset, ways),
KShots(test_dataset, 2 * test_shots),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
test_tasks = l2l.data.TaskDataset(test_dataset,
task_transforms=test_transforms,
num_tasks=600)
# Create model
model = l2l.vision.models.MiniImagenetCNN(ways)
model.to(device)
if use_adam:
opt = optim.Adam(model.parameters(), meta_lr, betas=(meta_mom, 0.999))
else:
opt = optim.SGD(model.parameters(), lr=meta_lr, momentum=meta_mom)
adapt_opt = optim.Adam(model.parameters(), lr=fast_lr, betas=(0, 0.999))
adapt_opt_state = adapt_opt.state_dict()
loss = nn.CrossEntropyLoss(reduction='mean')
for iteration in range(num_iterations):
# anneal meta-lr
if meta_decay:
frac_done = float(iteration) / num_iterations
new_lr = frac_done * meta_lr + (1 - frac_done) * meta_lr
for pg in opt.param_groups:
pg['lr'] = new_lr
# zero-grad the parameters
for p in model.parameters():
p.grad = torch.zeros_like(p.data)
meta_train_error = 0.0
meta_train_accuracy = 0.0
meta_valid_error = 0.0
meta_valid_accuracy = 0.0
meta_test_error = 0.0
meta_test_accuracy = 0.0
for task in range(meta_bsz):
# Compute meta-training loss
learner = deepcopy(model)
adapt_opt = optim.Adam(learner.parameters(),
lr=fast_lr,
betas=(0, 0.999))
adapt_opt.load_state_dict(adapt_opt_state)
batch = train_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch,
learner,
fast_lr,
loss,
adapt_steps=train_adapt_steps,
batch_size=train_bsz,
opt=adapt_opt,
shots=train_shots,
ways=ways,
device=device)
adapt_opt_state = adapt_opt.state_dict()
for p, l in zip(model.parameters(), learner.parameters()):
p.grad.data.add_(-1.0, l.data)
meta_train_error += evaluation_error.item()
meta_train_accuracy += evaluation_accuracy.item()
if iteration % test_interval == 0:
# Compute meta-validation loss
learner = deepcopy(model)
adapt_opt = optim.Adam(learner.parameters(),
lr=fast_lr,
betas=(0, 0.999))
adapt_opt.load_state_dict(adapt_opt_state)
batch = valid_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch,
learner,
fast_lr,
loss,
adapt_steps=test_adapt_steps,
batch_size=test_bsz,
opt=adapt_opt,
shots=test_shots,
ways=ways,
device=device)
meta_valid_error += evaluation_error.item()
meta_valid_accuracy += evaluation_accuracy.item()
# Compute meta-testing loss
learner = deepcopy(model)
adapt_opt = optim.Adam(learner.parameters(),
lr=fast_lr,
betas=(0, 0.999))
adapt_opt.load_state_dict(adapt_opt_state)
batch = test_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch,
learner,
fast_lr,
loss,
adapt_steps=test_adapt_steps,
batch_size=test_bsz,
opt=adapt_opt,
shots=test_shots,
ways=ways,
device=device)
meta_test_error += evaluation_error.item()
meta_test_accuracy += evaluation_accuracy.item()
# Print some metrics
print('\n')
print('Iteration', iteration)
print('Meta Train Error', meta_train_error / meta_bsz)
print('Meta Train Accuracy', meta_train_accuracy / meta_bsz)
if iteration % test_interval == 0:
print('Meta Valid Error', meta_valid_error / meta_bsz)
print('Meta Valid Accuracy', meta_valid_accuracy / meta_bsz)
print('Meta Test Error', meta_test_error / meta_bsz)
print('Meta Test Accuracy', meta_test_accuracy / meta_bsz)
# Average the accumulated gradients and optimize
for p in model.parameters():
p.grad.data.mul_(1.0 / meta_bsz).add_(p.data)
opt.step()
def main(
ways=5,
shots=5,
meta_lr=0.001,
fast_lr=0.1,
adapt_steps=5,
meta_bsz=32,
iters=1000,
cuda=1,
seed=42,
):
cuda = bool(cuda)
random.seed(seed)
np.random.seed(seed)
torch.manual_seed(seed)
device = torch.device('cpu')
if cuda and torch.cuda.device_count():
torch.cuda.manual_seed(seed)
device = torch.device('cuda')
# Create Datasets
train_dataset = l2l.vision.datasets.FC100(
root='~/data', transform=tv.transforms.ToTensor(), mode='train')
valid_dataset = l2l.vision.datasets.FC100(
root='~/data', transform=tv.transforms.ToTensor(), mode='validation')
test_dataset = l2l.vision.datasets.FC100(
root='~/data', transform=tv.transforms.ToTensor(), mode='test')
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
FusedNWaysKShots(train_dataset, n=ways, k=2 * shots),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms,
num_tasks=20000)
valid_transforms = [
FusedNWaysKShots(valid_dataset, n=ways, k=2 * shots),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
num_tasks=600)
test_transforms = [
FusedNWaysKShots(test_dataset, n=ways, k=2 * shots),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
test_tasks = l2l.data.TaskDataset(test_dataset,
task_transforms=test_transforms,
num_tasks=600)
# Create model
features = l2l.vision.models.ConvBase(output_size=64,
channels=3,
max_pool=True)
features = torch.nn.Sequential(features, Lambda(lambda x: x.view(-1, 256)))
features.to(device)
head = torch.nn.Linear(256, ways)
head = l2l.algorithms.MAML(head, lr=fast_lr)
head.to(device)
# Setup optimization
all_parameters = list(features.parameters()) + list(head.parameters())
optimizer = torch.optim.Adam(all_parameters, lr=meta_lr)
loss = nn.CrossEntropyLoss(reduction='mean')
for iteration in range(iters):
optimizer.zero_grad()
meta_train_error = 0.0
meta_train_accuracy = 0.0
meta_valid_error = 0.0
meta_valid_accuracy = 0.0
meta_test_error = 0.0
meta_test_accuracy = 0.0
for task in range(meta_bsz):
# Compute meta-training loss
learner = head.clone()
batch = train_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, features, loss, adapt_steps, shots, ways,
device)
evaluation_error.backward()
meta_train_error += evaluation_error.item()
meta_train_accuracy += evaluation_accuracy.item()
# Compute meta-validation loss
learner = head.clone()
batch = valid_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, features, loss, adapt_steps, shots, ways,
device)
meta_valid_error += evaluation_error.item()
meta_valid_accuracy += evaluation_accuracy.item()
# Compute meta-testing loss
learner = head.clone()
batch = test_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, features, loss, adapt_steps, shots, ways,
device)
meta_test_error += evaluation_error.item()
meta_test_accuracy += evaluation_accuracy.item()
# Print some metrics
print('\n')
print('Iteration', iteration)
print('Meta Train Error', meta_train_error / meta_bsz)
print('Meta Train Accuracy', meta_train_accuracy / meta_bsz)
print('Meta Valid Error', meta_valid_error / meta_bsz)
print('Meta Valid Accuracy', meta_valid_accuracy / meta_bsz)
print('Meta Test Error', meta_test_error / meta_bsz)
print('Meta Test Accuracy', meta_test_accuracy / meta_bsz)
# Average the accumulated gradients and optimize
for p in all_parameters:
p.grad.data.mul_(1.0 / meta_bsz)
optimizer.step()
def main(
ways=5,
shots=5,
meta_lr=0.002,
fast_lr=0.1, # original 0.1
reg_lambda=0,
adapt_steps=5, # original: 5
meta_bsz=32,
iters=1000, # orginal: 1000
cuda=1,
seed=42,
):
cuda = bool(cuda)
random.seed(seed)
np.random.seed(seed)
torch.manual_seed(seed)
device = torch.device('cpu')
if cuda and torch.cuda.device_count():
torch.cuda.manual_seed(seed)
device = torch.device('cuda')
train_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='train')
valid_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='validation')
test_dataset = l2l.vision.datasets.MiniImagenet(root='~/data', mode='test')
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, ways),
KShots(train_dataset, 2 * shots),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms,
num_tasks=20000)
valid_transforms = [
NWays(valid_dataset, ways),
KShots(valid_dataset, 2 * shots),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
num_tasks=600)
test_transforms = [
NWays(test_dataset, ways),
KShots(test_dataset, 2 * shots),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
test_tasks = l2l.data.TaskDataset(test_dataset,
task_transforms=test_transforms,
num_tasks=600)
# Create model
# features = l2l.vision.models.MiniImagenetCNN(ways)
features = l2l.vision.models.ConvBase(output_size=32,
channels=3,
max_pool=True)
# for p in features.parameters():
# print(p.shape)
features = torch.nn.Sequential(features,
Lambda(lambda x: x.view(-1, 1600)))
features.to(device)
head = torch.nn.Linear(1600, ways)
head = l2l.algorithms.MAML(head, lr=fast_lr)
head.to(device)
# Setup optimization
all_parameters = list(features.parameters())
# optimizer = torch.optim.Adam(all_parameters, lr=meta_lr)
## use different learning rates for w and theta
optimizer = torch.optim.Adam(all_parameters, lr=meta_lr)
loss = nn.CrossEntropyLoss(reduction='mean')
training_accuracy = torch.ones(iters)
test_accuracy = torch.ones(iters)
running_time = np.ones(iters)
import time
start_time = time.time()
for iteration in range(iters):
optimizer.zero_grad()
meta_train_error = 0.0
meta_train_accuracy = 0.0
meta_valid_error = 0.0
meta_valid_accuracy = 0.0
meta_test_error = 0.0
meta_test_accuracy = 0.0
for task in range(meta_bsz):
# Compute meta-training loss
learner = head.clone()
batch = train_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, features, loss, reg_lambda, adapt_steps, shots,
ways, device)
evaluation_error.backward()
meta_train_error += evaluation_error.item()
meta_train_accuracy += evaluation_accuracy.item()
# Compute meta-validation loss
learner = head.clone()
batch = valid_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, features, loss, reg_lambda, adapt_steps, shots,
ways, device)
meta_valid_error += evaluation_error.item()
meta_valid_accuracy += evaluation_accuracy.item()
# Compute meta-testing loss
learner = head.clone()
batch = test_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, features, loss, reg_lambda, adapt_steps, shots,
ways, device)
meta_test_error += evaluation_error.item()
meta_test_accuracy += evaluation_accuracy.item()
training_accuracy[iteration] = meta_train_accuracy / meta_bsz
test_accuracy[iteration] = meta_test_accuracy / meta_bsz
# Print some metrics
print('\n')
print('Iteration', iteration)
print('Meta Train Error', meta_train_error / meta_bsz)
print('Meta Train Accuracy', meta_train_accuracy / meta_bsz)
print('Meta Valid Error', meta_valid_error / meta_bsz)
print('Meta Valid Accuracy', meta_valid_accuracy / meta_bsz)
print('Meta Test Error', meta_test_error / meta_bsz)
print('Meta Test Accuracy', meta_test_accuracy / meta_bsz)
# Average the accumulated gradients and optimize
for p in all_parameters:
p.grad.data.mul_(1.0 / meta_bsz)
# print('head')
# for p in list(head.parameters()):
# print(torch.max(torch.abs(p.grad.data)))
# print('feature')
# for p in list(features.parameters()):
# print(torch.max(torch.abs(p.grad.data)))
optimizer.step()
end_time = time.time()
running_time[iteration] = end_time - start_time
print('total running time', end_time - start_time)
return training_accuracy.numpy(), test_accuracy.numpy(), running_time
def main(
ways=5,
shots=5,
meta_lr=0.001,
fast_lr=0.1, # original 0.1
reg_lambda=0,
adapt_steps=5, # original: 5
meta_bsz=32,
iters=1000, # orginal: 1000
cuda=1,
seed=42,
):
print('hlr=' + str(meta_lr) + ' flr=' + str(fast_lr) + ' reg=' +
str(reg_lambda))
cuda = bool(cuda)
random.seed(seed)
np.random.seed(seed)
torch.manual_seed(seed)
device = torch.device('cpu')
if cuda and torch.cuda.device_count():
torch.cuda.manual_seed(seed)
device = torch.device('cuda')
# Create Datasets
train_dataset = l2l.vision.datasets.FC100(
root='~/data', transform=tv.transforms.ToTensor(), mode='train')
valid_dataset = l2l.vision.datasets.FC100(
root='~/data', transform=tv.transforms.ToTensor(), mode='validation')
test_dataset = l2l.vision.datasets.FC100(
root='~/data', transform=tv.transforms.ToTensor(), mode='test')
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
FusedNWaysKShots(train_dataset, n=ways, k=2 * shots),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms,
num_tasks=20000)
valid_transforms = [
FusedNWaysKShots(valid_dataset, n=ways, k=2 * shots),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
num_tasks=600)
test_transforms = [
FusedNWaysKShots(test_dataset, n=ways, k=2 * shots),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
test_tasks = l2l.data.TaskDataset(test_dataset,
task_transforms=test_transforms,
num_tasks=600)
# Create model
features = l2l.vision.models.ConvBase(output_size=64,
channels=3,
max_pool=True)
features = torch.nn.Sequential(features, Lambda(lambda x: x.view(-1, 256)))
features.to(device)
head_dim = 256
# Setup optimization
all_parameters = list(features.parameters())
optimizer = torch.optim.Adam(all_parameters, lr=meta_lr)
# optimizer = torch.optim.SGD(all_parameters, lr=meta_lr)
loss = nn.CrossEntropyLoss(reduction='mean')
training_accuracy = torch.ones(iters)
test_accuracy = torch.ones(iters)
running_time = np.ones(iters)
import time
start_time = time.time()
for iteration in range(iters):
optimizer.zero_grad()
meta_train_error = 0.0
meta_train_accuracy = 0.0
meta_valid_error = 0.0
meta_valid_accuracy = 0.0
meta_test_error = 0.0
meta_test_accuracy = 0.0
for task in range(meta_bsz):
# Compute meta-training loss
batch = train_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, head_dim, features, loss, fast_lr, reg_lambda,
adapt_steps, shots, ways, device)
evaluation_error.backward()
meta_train_error += evaluation_error.item()
meta_train_accuracy += evaluation_accuracy.item()
# Compute meta-validation loss
batch = valid_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, head_dim, features, loss, fast_lr, reg_lambda,
adapt_steps, shots, ways, device)
meta_valid_error += evaluation_error.item()
meta_valid_accuracy += evaluation_accuracy.item()
# Compute meta-testing loss
batch = test_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, head_dim, features, loss, fast_lr, reg_lambda,
adapt_steps, shots, ways, device)
meta_test_error += evaluation_error.item()
meta_test_accuracy += evaluation_accuracy.item()
training_accuracy[iteration] = meta_train_accuracy / meta_bsz
test_accuracy[iteration] = meta_test_accuracy / meta_bsz
# Print some metrics
print('\n')
print('Iteration', iteration)
print('Meta Train Error', meta_train_error / meta_bsz)
print('Meta Train Accuracy', meta_train_accuracy / meta_bsz)
print('Meta Valid Error', meta_valid_error / meta_bsz)
print('Meta Valid Accuracy', meta_valid_accuracy / meta_bsz)
print('Meta Test Error', meta_test_error / meta_bsz)
print('Meta Test Accuracy', meta_test_accuracy / meta_bsz)
# Average the accumulated gradients and optimize
for p in all_parameters:
p.grad.data.mul_(1.0 / meta_bsz)
optimizer.step()
end_time = time.time()
running_time[iteration] = end_time - start_time
print('time per iteration', end_time - start_time)
return training_accuracy.numpy(), test_accuracy.numpy(), running_time
def main(
ways=4,
shots=5,
meta_lr=0.01,
fast_lr=0.5,
meta_batch_size=32,
adaptation_steps=1,
num_iterations=10000,
cuda=True,
seed=42,
):
random.seed(seed)
np.random.seed(seed)
torch.manual_seed(seed)
device = torch.device('cpu')
if cuda:
torch.cuda.manual_seed(seed)
device = torch.device('cuda')
# Create dataset
train_transforms = [
NWays(train_dataset, ways),
KShots(train_dataset, shots * 2),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset)
]
valid_transforms = [
NWays(valid_dataset, ways),
KShots(valid_dataset, shots * 2),
LoadData(valid_dataset),
RemapLabels(valid_dataset),
ConsecutiveLabels(valid_dataset)
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms,
num_tasks=1000)
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
num_tasks=200)
# Create model
model = Discriminator(ways=ways)
model.to(device)
maml = l2l.algorithms.MAML(model, lr=fast_lr, first_order=False)
opt = optim.Adam(maml.parameters(), meta_lr)
loss = nn.CrossEntropyLoss(reduction='mean')
best_acc = 0.0
writer = SummaryWriter("/home/sever2users/Desktop/MetaGAN/maml/viz")
for iteration in range(num_iterations):
opt.zero_grad()
meta_train_error = 0.0
meta_train_accuracy = 0.0
meta_valid_error = 0.0
meta_valid_accuracy = 0.0
for task in range(meta_batch_size):
# Compute meta-training loss
learner = maml.clone()
batch = train_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, loss, adaptation_steps, shots, ways, device)
evaluation_error.backward()
meta_train_error += evaluation_error.item()
meta_train_accuracy += evaluation_accuracy.item()
# Compute meta-validation loss
learner = maml.clone()
batch = valid_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, loss, adaptation_steps, shots, ways, device)
meta_valid_error += evaluation_error.item()
meta_valid_accuracy += evaluation_accuracy.item()
# Print some metrics
if iteration % 500 == 0:
print('\n')
print('Iteration', iteration)
print('Meta Train Error', meta_train_error / meta_batch_size)
print('Meta Train Accuracy', meta_train_accuracy / meta_batch_size)
print('Meta Valid Error', meta_valid_error / meta_batch_size)
print('Meta Valid Accuracy', meta_valid_accuracy / meta_batch_size)
writer.add_scalar(
"{}way_{}shot_{}train_as/accuracy/valid".format(
ways, shots, adaptation_steps),
(meta_valid_accuracy / meta_batch_size), iteration)
writer.add_scalar(
"{}way_{}shot_{}train_as/accuracy/train".format(
ways, shots, adaptation_steps),
(meta_train_accuracy / meta_batch_size), iteration)
writer.add_scalar(
"way_{}shot_{}train_as/loss/valid".format(ways, shots,
adaptation_steps),
(meta_valid_error / meta_batch_size), iteration)
writer.add_scalar(
"way_{}shot_{}train_as/loss/train".format(ways, shots,
adaptation_steps),
(meta_train_error / meta_batch_size), iteration)
if ((meta_valid_accuracy / meta_batch_size) > best_acc):
maml_test = maml.clone()
best_acc = (meta_valid_accuracy / meta_batch_size)
# Average the accumulated gradients and optimize
for p in maml.parameters():
p.grad.data.mul_(1.0 / meta_batch_size)
opt.step()
print("\n")
print(ways, "WAYS", shots, "SHOTS", adaptation_steps,
"train_adaptation_steps")
x = []
for a_s in [1, 3, 10, 20]:
for fast_lr in [0.5, 0.1, 0.05, 0.01]:
l, a = test(fast_lr, loss, a_s, shots, ways, device, maml_test,
valid_tasks)
x.append([a_s, fast_lr, a])
print("test_a_s=", a_s, 'fast_lr', fast_lr, "acc=", a)
np.savetxt(
'/home/sever2users/Desktop/MetaGAN/maml/test_results/{}way_{}shot_{}train_adp_steps.txt'
.format(ways, shots, adaptation_steps), np.array(x))
torch.save(
maml_test.module.state_dict(),
'/home/sever2users/Desktop/MetaGAN/maml/saved_models/state_dict_{}way_{}shot_{}train_adp_steps.pth'
.format(ways, shots, adaptation_steps))
def get_few_shot_tasksets(
root='data',
dataset='cifar10-fc100',
train_ways=5,
train_samples=10,
test_ways=5,
test_samples=10,
n_train_tasks=2000,
n_test_tasks=1000,
):
"""
Fetch the train, valid, test meta tasks of given dataset.
:param root: data directory.
:param dataset: name of dataset.
:param train_ways: number of ways of few-shot training.
:param train_samples: number of each-way samples for a training task.
:param test_ways: number of ways of few-shot evaluation and testing.
:param test_samples: number of each-way samples for a valid or test task.
:param n_train_tasks: total number of train tasks.
:param n_test_tasks: total number of valid and test tasks.
:return:
"""
train_dataset, valid_dataset, test_dataset = get_normal_tasksets(
root=root, dataset=dataset)
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, train_ways),
KShots(train_dataset, train_samples),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
test_transforms = [
NWays(test_dataset, test_ways),
KShots(test_dataset, test_samples),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
# Instantiate the tasksets
train_tasks = l2l.data.TaskDataset(
dataset=train_dataset,
task_transforms=train_transforms,
num_tasks=n_train_tasks,
)
valid_tasks = l2l.data.TaskDataset(
dataset=valid_dataset,
task_transforms=test_transforms,
num_tasks=n_test_tasks,
)
test_tasks = l2l.data.TaskDataset(
dataset=test_dataset,
task_transforms=test_transforms,
num_tasks=n_test_tasks,
)
return BenchmarkTasksets(train_tasks, valid_tasks, test_tasks)
def test(args):
device = torch.device('cpu')
if args.gpu and torch.cuda.device_count():
print("Using gpu")
torch.cuda.manual_seed(43)
device = torch.device('cuda')
if args.backbone2d:
model = Convnet2D(st_attention=args.st_attention)
else:
model = Convnet(st_attention=args.st_attention)
model.to(device)
relation_head = RelationHead(ways=args.test_way, dynamic=args.dynhead)
relation_head.to(device)
if args.temporal_align:
temporal_align = TemporalAlignMoudle(10, shot=args.test_shot)
temporal_align.to(device)
models = [model, relation_head]
if args.temporal_align:
models.append(temporal_align)
num_class, args.train_list, args.val_list, args.root_path, prefix, anno_prefix = dataset_config.return_dataset(
args.dataset, 'RGB')
args.test_list = args.train_list.replace('train', 'test')
path_data = args.root_path
num_segments = 20
test_dataset = TSNDataSet(path_data,
args.test_list,
num_segments=num_segments,
new_length=1,
modality='RGB',
image_tmpl=prefix,
transform=Compose([
GroupScale([128, 128]),
StackBatch(roll=False),
To3DTorchFormatTensor(div=True)
]),
dense_sample=False,
test_mode=True)
test_dataset = l2l.data.MetaDataset(
test_dataset, indices_to_labels=test_dataset.indices_to_labels)
test_transforms = [
NWays(test_dataset, args.test_way),
KShots(test_dataset, args.test_query + args.test_shot),
LoadData(test_dataset),
RemapLabels(test_dataset),
]
test_tasks = l2l.data.TaskDataset(test_dataset,
task_transforms=test_transforms,
num_tasks=2000)
test_loader = DataLoader(test_tasks,
num_workers=1,
pin_memory=True,
shuffle=True)
# test_prefetcher=DataPrefetcher(test_tasks)
loss_ctr = 0
n_acc = 0
model.load_state_dict(
torch.load('%s/%s/ckpt.pth' %
(args.root_model, args.store_name))['state_dict'])
relation_head.load_state_dict(
torch.load('%s/%s/ckpt.pth' %
(args.root_model, args.store_name))['head_dict'])
if args.temporal_align:
temporal_align.load_state_dict(
torch.load('%s/%s/ckpt.pth' %
(args.root_model, args.store_name))['align_dict'])
for m in models:
m.eval()
for i, batch in enumerate(test_loader, 1):
loss, acc = fast_adapt(models,
batch,
args.test_way,
args.test_shot,
args.test_query,
metric=pairwise_distances_logits,
device=device)
loss_ctr += 1
n_acc += acc.item()
sys.stdout.write('\rbatch {}: {:.2f}({:.2f}) \033[K'.format(
i, n_acc / loss_ctr * 100, acc * 100))
print()
def train(args):
logger = SummaryWriter(comment=args.comment)
device = torch.device('cpu')
if args.gpu and torch.cuda.device_count():
print("Using gpu")
torch.cuda.manual_seed(43)
device = torch.device('cuda')
if args.backbone2d:
model = Convnet2D(st_attention=args.st_attention)
else:
model = Convnet(st_attention=args.st_attention)
model.to(device)
relation_head = RelationHead(ways=args.train_way, dynamic=args.dynhead)
relation_head.to(device)
if args.temporal_align:
temporal_align = TemporalAlignMoudle(10, shot=args.shot)
# d=torch.load('./ckpt/pretrain_ta/ckpt.pth','cpu')
# temporal_align.load_state_dict(d['align_dict'])
temporal_align.to(device)
# del d
# train_augmentation = get_augmentation(flip=False if 'something' in args.dataset or 'jester' in args.dataset else True)
train_augmentation = Compose(
[GroupScale([128, 128]),
GroupRandomHorizontalFlip(is_flow=False)])
normalize = IdentityTransform()
num_class, args.train_list, args.val_list, args.root_path, prefix, anno_prefix = dataset_config.return_dataset(
args.dataset, 'RGB')
args.test_list = args.train_list.replace('train', 'test')
path_data = args.root_path
num_segments = 20
train_dataset = TSNDataSet(path_data,
args.train_list,
num_segments=num_segments,
new_length=1,
modality='RGB',
image_tmpl=prefix,
transform=Compose([
train_augmentation,
StackBatch(roll=False),
To3DTorchFormatTensor(div=True)
]),
dense_sample=False)
train_dataset = l2l.data.MetaDataset(
train_dataset, indices_to_labels=train_dataset.indices_to_labels)
train_transforms = [
NWays(train_dataset, args.train_way),
KShots(train_dataset, args.train_query + args.shot),
LoadData(train_dataset),
RemapLabels(train_dataset),
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms)
# train_loader = DataLoader(train_tasks,num_workers=1, pin_memory=True, shuffle=True)
train_prefetcher = DataPrefetcher(train_tasks)
valid_dataset = TSNDataSet(path_data,
args.val_list,
num_segments=num_segments,
new_length=1,
modality='RGB',
image_tmpl=prefix,
transform=Compose([
GroupScale([128, 128]),
StackBatch(roll=False),
To3DTorchFormatTensor(div=True)
]),
dense_sample=False)
valid_dataset = l2l.data.MetaDataset(
valid_dataset, indices_to_labels=valid_dataset.indices_to_labels)
valid_transforms = [
NWays(valid_dataset, args.test_way),
KShots(valid_dataset, args.test_query + args.test_shot),
LoadData(valid_dataset),
RemapLabels(valid_dataset),
]
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
num_tasks=100)
valid_loader = DataLoader(valid_tasks,
num_workers=1,
pin_memory=True,
shuffle=True)
# valid_prefetcher=DataPrefetcher(valid_tasks)
models = [model, relation_head]
param_groups = [{'params': m.parameters()} for m in models]
if args.temporal_align:
models.append(temporal_align)
param_groups.append({
'params': temporal_align.parameters(),
'lr': 1e-3
})
optimizer = torch.optim.Adam(param_groups, lr=1e-3)
lr_scheduler = torch.optim.lr_scheduler.StepLR(optimizer,
step_size=25,
gamma=0.5)
print('Start training')
best_metric = 0
for epoch in range(1, args.max_epoch + 1):
for m in models:
m.train()
loss_ctr = 0
n_loss = 0
n_acc = 0
batch = train_prefetcher.next()
for i in range(100):
# batch = next(iter(train_loader))
loss, acc = fast_adapt(models,
batch,
args.train_way,
args.shot,
args.train_query,
metric=pairwise_distances_logits,
device=device,
epoch=epoch)
loss_ctr += 1
n_loss += loss.item()
n_acc += acc.item()
batch = train_prefetcher.next()
optimizer.zero_grad()
loss.backward()
optimizer.step()
if (i + 1) % 10 == 0:
sys.stdout.write('\rWorking.... i=%d \033[K' % (i + 1))
lr_scheduler.step()
print('epoch {}, train, loss={:.4f} acc={:.4f}'.format(
epoch, n_loss / loss_ctr, n_acc / loss_ctr))
logger.add_scalar('train_acc', n_acc / loss_ctr, global_step=epoch)
ckpt = {
'epoch': epoch + 1,
'arch': 'raw_relation',
'state_dict': model.state_dict(),
'head_dict': relation_head.state_dict(),
'optimizer': optimizer.state_dict(),
'best_acc': -1,
}
if args.temporal_align:
ckpt['align_dict'] = temporal_align.state_dict()
save_checkpoint(ckpt, False)
for m in models:
m.eval()
loss_ctr = 0
n_loss = 0
n_acc = 0
# batch=valid_prefetcher.next()
with torch.no_grad():
for i, batch in enumerate(valid_loader):
# while batch is not None and batch[0] is not None:
loss, acc = fast_adapt(models,
batch,
args.test_way,
args.test_shot,
args.test_query,
metric=pairwise_distances_logits,
device=device,
epoch=epoch)
loss_ctr += 1
n_loss += loss.item()
n_acc += acc.item()
# batch=valid_prefetcher.next()
if (i + 1) % 10 == 0:
sys.stdout.write('\rEvaling.... i=%d \033[K' % (i + 1))
print('epoch {}, val, loss={:.4f} acc={:.4f}'.format(
epoch, n_loss / loss_ctr, n_acc / loss_ctr))
logger.add_scalar('val_acc', n_acc / loss_ctr, global_step=epoch)
metric_for_best = n_acc / loss_ctr
is_best = metric_for_best > best_metric
best_metric = max(metric_for_best, best_metric)
ckpt = {
'epoch': epoch + 1,
'arch': 'raw_relation',
'state_dict': model.state_dict(),
'head_dict': relation_head.state_dict(),
'optimizer': optimizer.state_dict(),
'best_acc': best_metric,
}
if args.temporal_align:
ckpt['align_dict'] = temporal_align.state_dict()
save_checkpoint(ckpt, is_best)
torch.cuda.empty_cache()
def cifarfs_tasksets(
train_ways=5,
train_samples=10,
test_ways=5,
test_samples=10,
root='~/data',
device=None,
**kwargs,
):
"""Tasksets for CIFAR-FS benchmarks."""
data_transform = tv.transforms.ToTensor()
train_dataset = l2l.vision.datasets.CIFARFS(root=root,
transform=data_transform,
mode='train',
download=True)
valid_dataset = l2l.vision.datasets.CIFARFS(root=root,
transform=data_transform,
mode='validation',
download=True)
test_dataset = l2l.vision.datasets.CIFARFS(root=root,
transform=data_transform,
mode='test',
download=True)
if device is not None:
train_dataset = l2l.data.OnDeviceDataset(
dataset=train_dataset,
device=device,
)
valid_dataset = l2l.data.OnDeviceDataset(
dataset=valid_dataset,
device=device,
)
test_dataset = l2l.data.OnDeviceDataset(
dataset=test_dataset,
device=device,
)
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, train_ways),
KShots(train_dataset, train_samples),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
valid_transforms = [
NWays(valid_dataset, test_ways),
KShots(valid_dataset, test_samples),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
test_transforms = [
NWays(test_dataset, test_ways),
KShots(test_dataset, test_samples),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
_datasets = (train_dataset, valid_dataset, test_dataset)
_transforms = (train_transforms, valid_transforms, test_transforms)
return _datasets, _transforms
def main(
ways=5,
shots=5,
meta_lr=0.003,
fast_lr=0.5,
meta_batch_size=32,
adaptation_steps=1,
num_iterations=60000,
cuda=True,
seed=42,
):
random.seed(seed)
np.random.seed(seed)
torch.manual_seed(seed)
device = torch.device('cpu')
if cuda and torch.cuda.device_count():
torch.cuda.manual_seed(seed)
device = torch.device('cuda')
# Create Datasets
train_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='train')
valid_dataset = l2l.vision.datasets.MiniImagenet(root='~/data',
mode='validation')
test_dataset = l2l.vision.datasets.MiniImagenet(root='~/data', mode='test')
train_dataset = l2l.data.MetaDataset(train_dataset)
valid_dataset = l2l.data.MetaDataset(valid_dataset)
test_dataset = l2l.data.MetaDataset(test_dataset)
train_transforms = [
NWays(train_dataset, ways),
KShots(train_dataset, 2 * shots),
LoadData(train_dataset),
RemapLabels(train_dataset),
ConsecutiveLabels(train_dataset),
]
train_tasks = l2l.data.TaskDataset(train_dataset,
task_transforms=train_transforms,
num_tasks=20000)
valid_transforms = [
NWays(valid_dataset, ways),
KShots(valid_dataset, 2 * shots),
LoadData(valid_dataset),
ConsecutiveLabels(valid_dataset),
RemapLabels(valid_dataset),
]
valid_tasks = l2l.data.TaskDataset(valid_dataset,
task_transforms=valid_transforms,
num_tasks=600)
test_transforms = [
NWays(test_dataset, ways),
KShots(test_dataset, 2 * shots),
LoadData(test_dataset),
RemapLabels(test_dataset),
ConsecutiveLabels(test_dataset),
]
test_tasks = l2l.data.TaskDataset(test_dataset,
task_transforms=test_transforms,
num_tasks=600)
# Create model
model = l2l.vision.models.MiniImagenetCNN(ways)
model.to(device)
maml = l2l.algorithms.MAML(model, lr=fast_lr, first_order=False)
opt = optim.Adam(maml.parameters(), meta_lr)
loss = nn.CrossEntropyLoss(reduction='mean')
training_accuracy = torch.ones(num_iterations)
test_accuracy = torch.ones(num_iterations)
running_time = np.ones(num_iterations)
import time
start_time = time.time()
for iteration in range(num_iterations):
opt.zero_grad()
meta_train_error = 0.0
meta_train_accuracy = 0.0
meta_valid_error = 0.0
meta_valid_accuracy = 0.0
meta_test_error = 0.0
meta_test_accuracy = 0.0
for task in range(meta_batch_size):
# Compute meta-training loss
learner = maml.clone()
batch = train_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, loss, adaptation_steps, shots, ways, device)
evaluation_error.backward()
meta_train_error += evaluation_error.item()
meta_train_accuracy += evaluation_accuracy.item()
# Compute meta-validation loss
learner = maml.clone()
batch = valid_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, loss, adaptation_steps, shots, ways, device)
meta_valid_error += evaluation_error.item()
meta_valid_accuracy += evaluation_accuracy.item()
# Compute meta-test loss
learner = maml.clone()
batch = test_tasks.sample()
evaluation_error, evaluation_accuracy = fast_adapt(
batch, learner, loss, adaptation_steps, shots, ways, device)
meta_test_error += evaluation_error.item()
meta_test_accuracy += evaluation_accuracy.item()
training_accuracy[iteration] = meta_train_accuracy / meta_batch_size
test_accuracy[iteration] = meta_test_accuracy / meta_batch_size
# Print some metrics
print('\n')
print('Iteration', iteration)
print('Meta Train Error', meta_train_error / meta_batch_size)
print('Meta Train Accuracy', meta_train_accuracy / meta_batch_size)
print('Meta Valid Error', meta_valid_error / meta_batch_size)
print('Meta Valid Accuracy', meta_valid_accuracy / meta_batch_size)
print('Meta Test Error', meta_test_error / meta_batch_size)
print('Meta Test Accuracy', meta_test_accuracy / meta_batch_size)
# Average the accumulated gradients and optimize
for p in maml.parameters():
p.grad.data.mul_(1.0 / meta_batch_size)
opt.step()
end_time = time.time()
running_time[iteration] = end_time - start_time
print('total running time', end_time - start_time)
# meta_test_error = 0.0
# meta_test_accuracy = 0.0
# for task in range(meta_batch_size):
# # Compute meta-testing loss
# learner = maml.clone()
# batch = test_tasks.sample()
# evaluation_error, evaluation_accuracy = fast_adapt(batch,
# learner,
# loss,
# adaptation_steps,
# shots,
# ways,
# device)
# meta_test_error += evaluation_error.item()
# meta_test_accuracy += evaluation_accuracy.item()
# print('Meta Test Error', meta_test_error / meta_batch_size)
# print('Meta Test Accuracy', meta_test_accuracy / meta_batch_size)
return training_accuracy.numpy(), test_accuracy.numpy(), running_time
transforms.ToTensor(),
transforms.Normalize((0.1307, ), (0.3081, )),
lambda x: x.view(1, 28, 28),
])
# transformations = transforms.Compose([transforms.ToTensor()])
# d=CustomDatasetFromCsvLocation("./mnist-demo.csv")
d = CustomDatasetFromCsvData('./mnist-demo.csv', 28, 28, transformations)
# import torch.dataset
t = l2l.data.MetaDataset(d)
train_tasks = l2l.data.TaskDataset(t,
task_transforms=[
NWays(t, n=3),
KShots(t, k=2),
LoadData(t),
RemapLabels(t),
ConsecutiveLabels(t)
],
num_tasks=1000)
model = Net(3)
# model = Net(ways)
maml_lr = 0.01
lr = 0.005
iterations = 1000
tps = 32
fas = 5
shots = 1
ways = 3
model.to(device)
meta_model = l2l.algorithms.MAML(model, lr=maml_lr)