def val(model, val_loader, criterion, epoch, writer, use_CUDA = True):
model.eval()
accuracy_logger = ScalarLogger(prefix = 'accuracy')
losses_logger = ScalarLogger(prefix = 'loss')
with torch.no_grad():
for (input, label, _) in val_loader:
input = to_var(input, requires_grad = False)
label = to_var(label, requires_grad = False).long()
output = model(input)
loss = criterion(output, label)
prediction = torch.softmax(output, 1)
top1 = accuracy(prediction, label)
accuracy_logger.update(top1)
losses_logger.update(loss)
accuracy_logger.write(writer, 'val', epoch)
losses_logger.write(writer, 'val', epoch)
accuracy_ = accuracy_logger.avg()
losses = losses_logger.avg()
print("Validation Epoch: {}, Accuracy: {}, Losses: {}".format(epoch, accuracy_, losses))
return accuracy_, losses
def train(model, input_channel, optimizer, criterion, train_loader, val_loader, epoch, writer, args, use_CUDA = True, clamp = False, num_classes = 10):
model.train()
accs = []
losses_w1 = []
losses_w2 = []
iter_val_loader = iter(val_loader)
meta_criterion = nn.CrossEntropyLoss(reduce = False)
index = 0
noisy_labels = []
true_labels = []
w = defaultdict()
w_logger = defaultdict()
losses_logger = defaultdict()
accuracy_logger = ScalarLogger(prefix = 'accuracy')
for (input, label, real) in train_loader:
noisy_labels.append(label)
true_labels.append(real)
input = to_var(input, requires_grad = False)
label = to_var(label, requires_grad = False).long()
index += 1
output = model(input)
loss = meta_criterion(output, label).sum() / input.shape[0]
prediction = torch.softmax(output, 1)
optimizer.zero_grad()
loss.backward()
optimizer.step()
top1 = accuracy(prediction, label)
accuracy_logger.update(top1)
noisy_labels = torch.cat(noisy_labels)
true_labels = torch.cat(true_labels)
mask = (noisy_labels != true_labels).cpu().numpy()
accuracy_logger.write(writer, 'train', epoch)
print("Training Epoch: {}, Accuracy: {}".format(epoch, accuracy_logger.avg()))
return accuracy_logger.avg()
def train(model,
vnet,
input_channel,
optimizers,
optimizer_vnet,
components,
criterion,
train_loader,
val_loader,
epoch,
writer,
args,
use_CUDA=True,
clamp=False,
num_classes=10):
model.train()
accs = []
losses_w1 = []
losses_w2 = []
iter_val_loader = iter(val_loader)
meta_criterion = nn.CrossEntropyLoss(reduce=False)
index = 0
noisy_labels = []
true_labels = []
w = defaultdict()
w_logger = defaultdict()
losses_logger = defaultdict()
accuracy_logger = ScalarLogger(prefix='accuracy')
for c in components:
w[c] = None
w_logger[c] = WLogger()
losses_logger[c] = ScalarLogger(prefix='loss')
for (input, label, real) in train_loader:
noisy_labels.append(label)
true_labels.append(real)
meta_model = get_model(args,
num_classes=num_classes,
input_channel=input_channel)
meta_model.load_state_dict(model.state_dict())
if use_CUDA:
meta_model = meta_model.cuda()
val_input, val_label, iter_val_loader = get_val_samples(
iter_val_loader, val_loader)
input = to_var(input, requires_grad=False)
label = to_var(label, requires_grad=False).long()
val_input = to_var(val_input, requires_grad=False)
val_label = to_var(val_label, requires_grad=False).long()
meta_output = meta_model(input)
cost = meta_criterion(meta_output, label)
#eps = to_var(torch.zeros(cost.size()))
cost_v = torch.reshape(cost, (len(cost), 1))
eps = vnet(cost_v.data) # shape: (N, 2)
meta_loss_backbone = (cost * eps[:, 0]).sum()
meta_loss_fc = (cost * eps[:, 1]).sum()
meta_model.zero_grad()
grads_backbone = torch.autograd.grad(
meta_loss_backbone, (meta_model.backbone.parameters()),
create_graph=True,
retain_graph=True)
grads_fc = torch.autograd.grad(meta_loss_fc,
(meta_model.fc.parameters()),
create_graph=True)
# Backbone Grads
meta_model.backbone.update_params(0.001, source_params=grads_backbone)
meta_val_feature = torch.flatten(meta_model.backbone(val_input), 1)
meta_val_output = meta_model.fc(meta_val_feature)
meta_val_loss = meta_criterion(meta_val_output, val_label).sum()
''' TODO: temorarily remove
if args.with_kl and args.reg_start <= epoch:
train_feature = torch.flatten(meta_model.backbone(input), 1)
meta_val_loss -= sample_wise_kl(train_feature, meta_val_feature)
grad_eps = torch.autograd.grad(meta_val_loss, eps, only_inputs = True, retain_graph = True)[0]
if clamp:
w['backbone'] = torch.clamp(-grad_eps, min = 0)
else:
w['backbone'] = -grad_eps
norm = torch.sum(abs(w['backbone']))
w['backbone'] = w['backbone'] / norm
'''
optimizer_vnet.zero_grad()
meta_val_loss.backward(retain_graph=True)
optimizer_vnet.step()
# FC backward
meta_model.load_state_dict(model.state_dict())
meta_model.fc.update_params(0.001, source_params=grads_fc)
meta_val_output = meta_model(val_input)
meta_val_loss = meta_criterion(meta_val_output, val_label).sum()
'''
grad_eps = torch.autograd.grad(meta_val_loss, eps, only_inputs = True, retain_graph = True)[0]
if clamp:
w['fc'] = torch.clamp(-grad_eps, min = 0)
else:
w['fc'] = -grad_eps
norm = torch.sum(abs(w['fc']))
w['fc'] = w['fc'] / norm
'''
optimizer_vnet.zero_grad()
meta_val_loss.backward(retain_graph=True)
optimizer_vnet.step()
index += 1
output = model(input)
losses = defaultdict()
loss = meta_criterion(output, label)
loss_v = torch.reshape(loss, (len(loss), 1))
with torch.no_grad():
w_ = vnet(loss_v)
if clamp:
w_ = torch.clamp(w_, min=0)
for i in range(w_.shape[1]):
w_[:, i] = torch.sum(torch.abs(w_[:, i]))
w['backbone'] = w_[:, 0]
w['fc'] = w_[:, 1]
prediction = torch.softmax(output, 1)
for c in components:
w_logger[c].update(w[c])
losses[c] = (loss * w[c]).sum()
optimizers[c].zero_grad()
losses[c].backward(retain_graph=True)
optimizers[c].step()
losses_logger[c].update(losses[c])
top1 = accuracy(prediction, label)
accuracy_logger.update(top1)
noisy_labels = torch.cat(noisy_labels)
true_labels = torch.cat(true_labels)
mask = (noisy_labels != true_labels).cpu().numpy()
for c in components:
w_logger[c].write(writer, c, epoch)
w_logger[c].mask_write(writer, c, epoch, mask)
losses_logger[c].write(writer, c, epoch)
accuracy_logger.write(writer, 'train', epoch)
print("Training Epoch: {}, Accuracy: {}".format(epoch,
accuracy_logger.avg()))
return accuracy_logger.avg()
def train(model,
input_channel,
optimizers,
criterion,
components,
train_loader,
val_loader,
epoch,
writer,
args,
use_CUDA=True,
clamp=False,
num_classes=10):
model.train()
accs = []
losses_w1 = []
losses_w2 = []
iter_val_loader = iter(val_loader)
meta_criterion = nn.CrossEntropyLoss(reduce=False)
index = 0
noisy_labels = []
true_labels = []
w = defaultdict()
w_logger = defaultdict()
losses_logger = defaultdict()
accuracy_logger = ScalarLogger(prefix='accuracy')
for c in components:
w[c] = None
w_logger[c] = WLogger()
losses_logger[c] = ScalarLogger(prefix='loss')
for (input, label, real) in train_loader:
noisy_labels.append(label)
true_labels.append(real)
meta_model = get_model(args,
num_classes=num_classes,
input_channel=input_channel)
meta_model.load_state_dict(model.state_dict())
if use_CUDA:
meta_model = meta_model.cuda()
val_input, val_label, iter_val_loader = get_val_samples(
iter_val_loader, val_loader)
input = to_var(input, requires_grad=False)
label = to_var(label, requires_grad=False).long()
val_input = to_var(val_input, requires_grad=False)
val_label = to_var(val_label, requires_grad=False).long()
meta_output = meta_model(input)
cost = meta_criterion(meta_output, label)
eps = to_var(torch.zeros(cost.size()))
meta_loss = (cost * eps).sum()
meta_model.zero_grad()
if 'all' in components:
grads = torch.autograd.grad(meta_loss, (meta_model.parameters()),
create_graph=True)
meta_model.update_params(0.001, source_params=grads)
meta_val_output = meta_model(val_input)
meta_val_loss = meta_criterion(meta_val_output, val_label).sum()
grad_eps = torch.autograd.grad(meta_val_loss,
eps,
only_inputs=True)[0]
if clamp:
w['all'] = torch.clamp(-grad_eps, min=0)
else:
w['all'] = -grad_eps
norm = torch.sum(abs(w['all']))
assert (clamp and len(components)
== 1) or (len(components) > 1), "Error combination"
w['all'] = w['all'] / norm
if ('fc' in components):
w['fc'] = copy.deepcopy(w['all'])
w['fc'] = torch.clamp(w['fc'], max=0)
w['all'] = torch.clamp(w['all'], min=0)
elif ('backbone' in components):
w['backbone'] = copy.deepcopy(w['all'])
w['backbone'] = torch.clamp(w['backbone'], max=0)
w['all'] = torch.clamp(w['all'], min=0)
else:
assert ('backbone' in components) and ('fc' in components)
grads_backbone = torch.autograd.grad(
meta_loss, (meta_model.backbone.parameters()),
create_graph=True,
retain_graph=True)
grads_fc = torch.autograd.grad(meta_loss,
(meta_model.fc.parameters()),
create_graph=True)
# Backbone Grads
meta_model.backbone.update_params(0.001,
source_params=grads_backbone)
meta_val_feature = torch.flatten(meta_model.backbone(val_input), 1)
meta_val_output = meta_model.fc(val_input)
meta_val_loss = meta_criterion(meta_val_output, val_label).sum()
if args.with_kl and args.reg_start <= epoch:
train_feature = torch.flatten(meta_model.backbone(input), 1)
meta_val_loss -= sample_wise_kl(train_feature,
meta_val_feature)
grad_eps = torch.autograd.grad(meta_val_loss,
eps,
only_inputs=True,
retain_graph=True)[0]
if clamp:
w['backbone'] = torch.clamp(-grad_eps, min=0)
else:
w['backbone'] = -grad_eps
norm = torch.sum(abs(w['backbone']))
w['backbone'] = w['backbone'] / norm
# FC backward
meta_model.load_state_dict(model.state_dict())
meta_model.fc.update_params(0.001, source_params=grads_fc)
meta_val_output = meta_model(val_input)
meta_val_loss = meta_criterion(meta_val_output, val_label).sum()
grad_eps = torch.autograd.grad(meta_val_loss,
eps,
only_inputs=True,
retain_graph=True)[0]
if clamp:
w['fc'] = torch.clamp(-grad_eps, min=0)
else:
w['fc'] = -grad_eps
norm = torch.sum(abs(w['fc']))
w['fc'] = w['fc'] / norm
index += 1
output = model(input)
loss = defaultdict()
prediction = torch.softmax(output, 1)
for c in components:
w_logger[c].update(w[c])
loss[c] = (meta_criterion(output, label) * w[c]).sum()
optimizers[c].zero_grad()
loss[c].backward(retain_graph=True)
optimizers[c].step()
losses_logger[c].update(loss[c])
top1 = accuracy(prediction, label)
accuracy_logger.update(top1)
noisy_labels = torch.cat(noisy_labels)
true_labels = torch.cat(true_labels)
mask = (noisy_labels != true_labels).cpu().numpy()
for c in components:
w_logger[c].write(writer, c, epoch)
w_logger[c].mask_write(writer, c, epoch, mask)
losses_logger[c].write(writer, c, epoch)
accuracy_logger.write(writer, 'train', epoch)
print("Training Epoch: {}, Accuracy: {}".format(epoch,
accuracy_logger.avg()))
return accuracy_logger.avg()