def run_train_iter(self, x, y,manual_verified,epoch_number = -1):
"""
Receives the inputs and targets for the model and runs a training iteration. Returns loss and accuracy metrics.
:param x: The inputs to the model. A numpy array of shape batch_size, channels, height, width
:param y: The targets for the model. A numpy array of shape batch_size, num_classes
:return: the loss and accuracy for this batch
"""
self.train() # sets model to training mode (in case batch normalization or other methods have different procedures for training and evaluation)
if len(y.shape) > 1:
y = np.argmax(y, axis=1) # convert one hot encoded labels to single integer labels
y_no_cuda = y
#print(type(x))
if type(x) is np.ndarray:
x, y = torch.Tensor(x).float().to(device=self.device), torch.Tensor(y).long().to(
device=self.device) # send data to device as torch tensors
y_no_cuda = torch.Tensor(y_no_cuda).long()
x = x.to(self.device)
y = y.to(self.device)
if self.mixup == True:
inputs, targets_a, targets_b,y_, lam = MixUp.mixup_data(x, y,y_no_cuda,self.num_classes,
self.alpha, use_cuda=self.use_gpu)
# inputs, targets_a, targets_b = map(Variable, (inputs,
# targets_a, targets_b))
if self.stack == True:
x_stack = torch.stack((x, inputs), 0)
x_stack = x_stack.view((self.batch_size,1,self.heigth,self.width))
out = self.model.forward_train(x_stack)
loss_mix = MixUp.mixup_criterion(out[:int(self.batch_size/2)],targets_a,targets_b,lam,self.device)
loss_smooth = CustomLosses.loss_function(out[int(self.batch_size/2):],y,y_no_cuda,self.num_classes,self.device,self.eps_smooth,self.loss_function,
array_manual_label=manual_verified,consider_manual = self.consider_manual)
loss = (loss_mix + loss_smooth)/2
else:
out = self.model.forward_train(x) # forward the data in the model
loss = MixUp.mixup_criterion(out, targets_a, targets_b, lam,self.device)
else:
out = self.model.forward_train(x)
loss = CustomLosses.loss_function(out,y,y_no_cuda,self.num_classes,self.device,self.eps_smooth,self.loss_function,
array_manual_label=manual_verified,consider_manual = self.consider_manual)
#if self.loss_function=='CCE':
# loss = F.cross_entropy(input=out, target=y) # compute loss
#elif self.loss_function=='lq_loss':
# loss=CustomLosses.lq_loss(y_true=y,y_pred=out,_q=self.q_)
self.optimizer.zero_grad() # set all weight grads from previous training iters to 0
loss.backward() # backpropagate to compute gradients for current iter loss
self.optimizer.step() # update network parameters
_, predicted = torch.max(out.data, 1) # get argmax of predictions
if self.stack:
accuracy = np.mean(list(predicted[int(self.batch_size/2):].eq(y.data).cpu()))
else:
accuracy = np.mean(list(predicted.eq(y.data).cpu())) # compute accuracy
return loss.data.detach().cpu().numpy(), accuracy
def train(epoch):
logf.write('\nEpoch: %d' % epoch)
print('Epoch: %d' % epoch)
net.train()
train_loss, correct, total = 0, 0, 0
batch_accs = []
batch_losses = []
for batch_idx, (inputs, targets) in enumerate(trainloader):
inputs, targets = inputs.to(device), targets.to(device)
if args.use_mix_up:
optimizer.zero_grad()
inputs, targets_a, targets_b, lam = mixup_data(
args, inputs, targets, args.mix_up_alpha,
args.use_uniform_mixup, use_cuda)
inputs, targets_a, targets_b = map(Variable,
(inputs, targets_a, targets_b))
outputs = net(inputs)
loss = mixup_criterion(criterion, outputs, targets_a, targets_b,
lam)
train_loss += loss.item()
_, predicted = torch.max(outputs.data, 1)
total += targets.size(0)
correct += (
lam * predicted.eq(targets_a.data).cpu().sum().float() +
(1 - lam) * predicted.eq(targets_b.data).cpu().sum().float())
optimizer.zero_grad()
loss.backward()
optimizer.step()
else:
inputs, targets = inputs.to(device), targets.to(device)
optimizer.zero_grad()
outputs = net(inputs)
loss = criterion(outputs, targets)
loss.backward()
optimizer.step()
train_loss += loss.item()
_, predicted = outputs.max(1)
total += targets.size(0)
correct += predicted.eq(targets).sum().item()
cur_loss = train_loss / (batch_idx + 1)
acc = 100. * correct / total
logf.write('[%d]Loss: %.3f | Acc: %.3f%% (%d/%d)\n' %
(batch_idx, cur_loss, acc, correct, total))
if batch_idx % 100 == 0:
print('[%d]Loss: %.3f | Acc: %.3f%% (%d/%d)' %
(batch_idx, cur_loss, acc, correct, total))
batch_accs.append(acc)
batch_losses.append(cur_loss)
acc = float(correct) / total
print('Train Acc:{}'.format(acc))
return np.mean(batch_losses), acc
for epoch in range(epochs):
print('\nEpoch: {}'.format(epoch + 1))
train_loss = 0
correct = 0
total = 0
batch_idx = 0
since = time.time()
for inputs, targets in train_loader:
backbone.train()
margin.train()
inputs, targets = inputs.to(device), targets.to(device)
if mixup:
inputs, targets_a, targets_b, lam = mixup_data(inputs, targets, alpha)
feature = backbone(inputs)
outputs = margin(feature, targets_a, targets_b, lam, device=device, mixed_precision=mixed_precision)
loss = mixup_criterion(criterion, outputs, targets_a, targets_b, lam)
else:
feature = backbone(inputs)
outputs = margin(feature, targets, device=device, mixed_precision=mixed_precision)
loss = criterion(outputs, targets)
if mixed_precision:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
if iter_idx % accumulate == 0:
optimizer.step()
optimizer.zero_grad()
train_loss += loss.item() / batch_size
_, predicted = outputs.max(1)
total += targets.size(0)
def iterate(epoch, phase):
is_train = True
if phase == 'train':
is_train = True
elif phase == 'valid':
is_train = False
else:
raise ValueError('Unrecognized phase: ' + str(phase))
if is_train is True:
net.train()
'''learning rate scheduling'''
if config['optimizer']['use_adam'] is False:
lr = optim.get_epoch_lr(epoch)
optim.set_lr(optimizer, lr)
else:
net.eval()
phase_dataloader = dataloaders[phase]
acc_loss = 0.
is_saved = False
global best_valid_loss
global global_iter_valid
global global_iter_train
with torch.set_grad_enabled(is_train):
# with autograd.detect_anomaly():
for batch_idx, (inputs, targets) in enumerate(phase_dataloader):
inputs = inputs.to(device)
targets = targets.to(device)
# view_inputs(inputs)
if is_train is True:
'''mix up'''
inputs, targets_a, targets_b, lam = mixup.mixup_data(inputs, targets,
device, float(config['params']['mixup_alpha']))
# inputs, targets_a, targets_b = map(Variable, (inputs,
# targets_a, targets_b))
'''label smoothing'''
targets_a = label_smoothing.smooth_one_hot(true_labels=targets_a, classes=num_classes,
smoothing=float(config['params']['label_smoothing']))
targets_b = label_smoothing.smooth_one_hot(true_labels=targets_b, classes=num_classes,
smoothing=float(config['params']['label_smoothing']))
else:
targets = label_smoothing.smooth_one_hot(true_labels=targets, classes=num_classes,
smoothing=0.0)
# view_inputs(inputs)
if config['model']['type'] == 'arcface':
if is_train is True:
logits = net(inputs, targets_a)
else:
logits = net(inputs, targets)
else:
logits = net(inputs)
outputs = logits.log_softmax(dim=1)
if is_train is True:
loss = mixup.mixup_criterion(criterion, outputs, targets_a, targets_b, lam)
optimizer.zero_grad()
loss.backward()
optimizer.step()
else:
loss = criterion(outputs, targets)
preds = outputs.argmax(dim=1, keepdim=True)
if is_train is True:
targets_a = targets_a.argmax(dim=1, keepdim=True)
targets_b = targets_b.argmax(dim=1, keepdim=True)
accuracy = (lam * preds.eq(targets_a).float().sum()
+ (1 - lam) * preds.eq(targets_b).float().sum())
accuracy = accuracy / (targets_a.shape[0] + targets_b.shape[0])
else:
targets = targets.argmax(dim=1, keepdim=True)
accuracy = preds.eq(targets).float().mean()
acc_loss += loss.item()
avg_loss = acc_loss / (batch_idx + 1)
print('[%s] epoch: %3d | iter: %4d | loss: %.3f | avg_loss: %.3f | accuracy: %.3f'
% (phase, epoch, batch_idx, loss.item(), avg_loss, accuracy))
if is_train is True:
summary_writer.add_scalar('train/loss', loss.item(), global_iter_train)
summary_writer.add_scalar('train/acc', accuracy, global_iter_train)
global_iter_train += 1
else:
summary_writer.add_scalar('valid/loss', loss.item(), global_iter_valid)
summary_writer.add_scalar('valid/acc', accuracy, global_iter_valid)
global_iter_valid += 1
state = {
'net': net.state_dict(),
'loss': best_valid_loss,
'epoch': epoch,
'lr': config['optimizer']['lr'],
'batch': config['params']['batch_size'],
'global_train_iter': global_iter_train,
'global_valid_iter': global_iter_valid,
'optimizer': optimizer.state_dict()
}
if is_train is True:
print('[Train] Saving..')
# torch.save(state, config['model']['exp_path'] + '/ckpt-' + str(epoch) + '.pth')
torch.save(state, os.path.join(config['exp']['path'], 'latest.pth'))
else:
# check whether better model or not
if avg_loss < best_valid_loss:
best_valid_loss = avg_loss
is_saved = True
if is_saved is True:
print('[Valid] Saving..')
# torch.save(state, config['model']['exp_path'] + '/ckpt-' + str(epoch) + '.pth')
torch.save(state, os.path.join(config['exp']['path'], 'best.pth'))
def train(args, batch_size):
current_epoch = 0
width = height = 320
data_dir = 'data/data/'
dataset = ImageDataset(data_dir, 'data/training.csv', width, height)
category_map = get_categories('data/species.csv')
file_count = len(dataset) // batch_size
model = seresnext50_32x4d(True, num_classes=len(category_map), drop_rate=0)
#model = resnest50_fast_1s4x24d('pretrained/resnest50_fast_1s4x24d-d4a4f76f.pth', num_classes=len(category_map))
#model = resnest50_fast_4s2x40d('pretrained/resnest50_fast_4s2x40d-41d14ed0.pth', num_classes=len(category_map))
model = torch.nn.DataParallel(model).cuda()
if args.resume_from != None:
current_epoch = get_epoch(args.resume_from)
model_dict = torch.load(args.resume_from).module.state_dict()
model.module.load_state_dict(model_dict)
print("resume from ", args.resume_from)
lr = 0.005
use_lr = lr
optimizer = SGD(model.parameters(),
lr=use_lr,
momentum=0.9,
weight_decay=0.0001)
print(current_epoch)
lr_scheduler = torch.optim.lr_scheduler.StepLR(optimizer,
3,
gamma=0.5,
last_epoch=-1)
#lr_scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(optimizer, T_max=10, eta_min=0.00005)
#lr_scheduler = torch.optim.lr_scheduler.ExponentialLR(optimizer, 0.8)
epochs = 15
loss_fn = nn.CrossEntropyLoss()
show_loss_loop = 10
alpha = 0.1
for epoch in range(current_epoch, epochs):
show_cate_loss = 0
dataloader = DataLoader(dataset=dataset,
batch_size=batch_size,
shuffle=True,
num_workers=4)
start = time.time()
for i, data in enumerate(dataloader):
optimizer.zero_grad()
if random.random() < 0.5:
inputs = to_tensor(data[0]).cuda()
targets = data[1].cuda()
inputs, targets_a, targets_b, lam = mixup_data(
inputs, targets, alpha, True)
inputs, targets_a, targets_b = map(
Variable, (inputs, targets_a, targets_b))
outputs = model(inputs)
cate_loss = mixup_criterion(loss_fn, outputs, targets_a,
targets_b, lam)
else:
im = to_tensor(data[0]).cuda()
category_id = data[1].cuda()
cate_fc = model(im)
cate_loss = loss_fn(cate_fc, category_id)
cate_loss.backward()
optimizer.step()
show_cate_loss += cate_loss.item()
if (i + 1) % show_loss_loop == 0:
end = time.time()
use_time = (end - start) / show_loss_loop
start = end
need_time = ((file_count *
(epochs - epoch) - i) * use_time) / 60 / 60
show_cate_loss /= show_loss_loop
print("epoch: {}/{} iter:{}/{} lr:{:.5f}, cate_loss:{:.5f}, use_time:{:.2f}/iter, need_time:{:.2f} h".\
format(epoch+1, epochs, (i+1), file_count, lr_scheduler.get_lr()[0], show_cate_loss, use_time, need_time))
show_cate_loss = 0
lr_scheduler.step()
torch.save(model, 'models/epoch_{}.pth'.format(epoch + 1))