def validate(dataset, gen_model, disc_model, criterion, epoch, device, args,
save_path_pictures):
batch_time = AverageMeter()
losses = AverageMeter()
gen_losses = AverageMeter()
disc_losses = AverageMeter()
gen_model.eval()
disc_model.eval()
end = time.time()
for i, (input, target) in enumerate(dataset.val_loader):
with torch.no_grad():
input, target = input.to(device), input.to(device)
if args.no_gpus > 1:
input_size = gen_model.module.input_size
else:
input_size = gen_model.input_size
# set inputs and targets
z = torch.randn((input.size(0), input_size)).to(device)
y_real, y_fake = torch.ones(input.size(0),
1).to(device), torch.zeros(
input.size(0), 1).to(device)
disc_real = disc_model(input)
gen_out = gen_model(z)
disc_fake = disc_model(gen_out)
disc_real_loss = criterion(disc_real, y_real)
disc_fake_loss = criterion(disc_fake, y_fake)
disc_loss = disc_real_loss + disc_fake_loss
disc_losses.update(disc_loss.item(), input.size(0))
gen_out = gen_model(z)
disc_fake = disc_model(gen_out)
gen_loss = criterion(disc_fake, y_real)
gen_losses.update(gen_loss.item(), input.size(0))
if i % args.print_freq == 0:
save_image((gen_out.data.view(-1, input.size(1), input.size(2),
input.size(3))),
os.path.join(
save_path_pictures, 'sample_epoch_' +
str(epoch) + '_ite_' + str(i + 1) + '.png'))
del input, target, z, y_real, y_fake, disc_real, gen_out, disc_fake
print(' * Validate: Generator Loss {gen_losses.avg:.3f} Discriminator Loss {disc_losses.avg:.3f}'\
.format(gen_losses=gen_losses, disc_losses=disc_losses))
print('-' * 80)
return disc_losses.avg, gen_losses.avg
def validate(dataset, model, criterion, epoch, device, args):
"""
Evaluates/validates the model
Parameters:
dataset (torch.utils.data.TensorDataset): The dataset
model (torch.nn.module): Model to be evaluated/validated
criterion (torch.nn.criterion): Loss function
epoch (int): Epoch counter
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int).
Returns:
float: top1 accuracy
"""
cl_losses = AverageMeter()
top1 = AverageMeter()
top5 = AverageMeter()
# switch to evaluate mode
model.eval()
with torch.no_grad():
for i, (input, target) in enumerate(dataset.val_loader):
input, target = input.to(device), target.to(device)
# compute output
output = model(input)
# make targets one-hot for using BCEloss
target_temp = target
one_hot = torch.zeros(target.size(0), output.size(1)).to(device)
one_hot.scatter_(1, target.long().view(target.size(0), -1), 1)
target = one_hot
# compute loss and accuracy
loss = criterion(output, target)
prec1, prec5 = accuracy(output, target_temp, (1, 5))
# measure accuracy and record loss
cl_losses.update(loss.item(), input.size(0))
top1.update(prec1.item(), input.size(0))
top5.update(prec5.item(), input.size(0))
#
print(
' * Validation Task: \nLoss {loss.avg:.5f} Prec@1 {top1.avg:.3f} Prec@5 {top5.avg:.3f}'
.format(loss=cl_losses, top1=top1, top5=top5))
print('=' * 80)
return top1.avg
def validate(Dataset, model, criterion, epoch, writer, device, save_path, args):
"""
Evaluates/validates the model
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be evaluated/validated
criterion (torch.nn.criterion): Loss function
epoch (int): Epoch counter
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
save_path (str): path to save data to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int), epochs (int), incremental_data (bool), autoregression (bool),
visualization_epoch (int), cross_dataset (bool), num_base_tasks (int), num_increment_tasks (int) and
patch_size (int).
Returns:
float: top1 precision/accuracy
float: average loss
"""
# initialize average meters to accumulate values
losses = AverageMeter()
class_losses = AverageMeter()
inos_losses = AverageMeter()
batch_time = AverageMeter()
top1 = AverageMeter()
# confusion matrix
confusion = ConfusionMeter(model.module.num_classes, normalized=True)
# switch to evaluate mode
model.eval()
end = time.time()
# evaluate the entire validation dataset
with torch.no_grad():
for i, (inp, target) in enumerate(Dataset.val_loader):
inp = inp.to(device)
target = target.to(device)
recon_target = inp
class_target = target[0]
# compute output
output, score = model(inp)
# compute loss
cl,rl = criterion(output, target, score, device, args)
loss = cl + rl
# measure accuracy, record loss, fill confusion matrix
prec1 = accuracy(output, class_target)[0]
top1.update(prec1.item(), inp.size(0))
class_losses.update(cl.item(), inp.size(0))
inos_losses.update(rl.item(), inp.size(0))
confusion.add(output.data, target)
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
losses.update(loss.item(), inp.size(0))
# Print progress
if i % args.print_freq == 0:
print('Validate: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
.format(
epoch+1, i, len(Dataset.val_loader), batch_time=batch_time, loss=losses,
top1=top1))
# TensorBoard summary logging
writer.add_scalar('validation/precision@1', top1.avg, epoch)
writer.add_scalar('validation/average_loss', losses.avg, epoch)
writer.add_scalar('validation/class_loss',class_losses.avg, epoch)
writer.add_scalar('validation/inos_loss', inos_losses.avg, epoch)
print(' * Validation: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}'.format(loss=losses, top1=top1))
# At the end of training isolated, or at the end of every task visualize the confusion matrix
if (epoch + 1) % args.epochs == 0 and epoch > 0:
# visualize the confusion matrix
visualize_confusion(writer, epoch + 1, confusion.value(), Dataset.class_to_idx, save_path)
return top1.avg, losses.avg
def train(train_loader, model, criterion, epoch, optimizer, lr_scheduler,
device, args, split_batch_size):
"""
trains the model of a net for one epoch on the train set
Parameters:
train_loader (torch.utils.data.DataLoader): data loader for the train set
model (lib.Models.network.Net): model of the net to be trained
criterion (torch.nn.BCELoss): loss criterion to be optimized
epoch (int): continuous epoch counter
optimizer (torch.optim.SGD): optimizer instance like SGD or Adam
lr_scheduler (lib.Training.learning_rate_scheduling.LearningRateScheduler): class implementing learning rate
schedules
device (torch.device): computational device (cpu or gpu)
args (argparse.ArgumentParser): parsed command line arguments
split_batch_size (int): smaller batch size after splitting the original batch size for fitting the device
memory
"""
# performance and computational overhead metrics
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
hard_prec = AverageMeter()
soft_prec = AverageMeter()
# switch to train mode
model.train()
end = time.time()
factor = args.batch_size // split_batch_size
last_batch = int(
math.ceil(len(train_loader.dataset) / float(split_batch_size)))
optimizer.zero_grad()
print('training')
for i, (input_, target) in enumerate(train_loader):
# hacky way to deal with terminal batch-size of 1
if input_.size(0) == 1:
print('skip last training batch of size 1')
continue
input_, target = input_.to(device), target.to(device)
data_time.update(time.time() - end)
# adjust learning rate after every 'factor' times 'batch count' (after every batch had the batch size not been
# split)
if i % factor == 0:
lr_scheduler.adjust_learning_rate(optimizer, i // factor + 1)
output = model(input_)
# scale the loss by the ratio of the split batch size and the original
loss = criterion(output, target) * input_.size(0) / float(
args.batch_size)
# update the 'losses' meter with the actual measure of the loss
losses.update(loss.item() * args.batch_size / float(input_.size(0)),
input_.size(0))
# compute performance measures
output = output >= 0.5 # binarizing sigmoid output by thresholding with 0.5
equality_matrix = (output.float() == target).float()
hard = torch.mean(torch.prod(equality_matrix, dim=1)) * 100.
soft = torch.mean(equality_matrix) * 100.
# update peformance meters
hard_prec.update(hard.item(), input_.size(0))
soft_prec.update(soft.item(), input_.size(0))
loss.backward()
# update the weights after every 'factor' times 'batch count' (after every batch had the batch size not been
# split)
if (i + 1) % factor == 0 or i == (last_batch - 1):
optimizer.step()
optimizer.zero_grad()
del output, input_, target
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print performance and computational overhead measures after every 'factor' times 'batch count' (after every
# batch had the batch size not been split)
if i % (args.print_freq * factor) == 0:
print(
'epoch: [{0}][{1}/{2}]\t'
'time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'loss {losses.val:.3f} ({losses.avg:.3f})\t'
'hard prec {hard_prec.val:.3f} ({hard_prec.avg:.3f})\t'
'soft prec {soft_prec.val:.3f} ({soft_prec.avg:.3f})\t'.format(
epoch,
i,
len(train_loader),
batch_time=batch_time,
data_time=data_time,
losses=losses,
hard_prec=hard_prec,
soft_prec=soft_prec))
lr_scheduler.scheduler_epoch += 1
print(
' * train: loss {losses.avg:.3f} hard prec {hard_prec.avg:.3f} soft prec {soft_prec.avg:.3f}'
.format(losses=losses, hard_prec=hard_prec, soft_prec=soft_prec))
print('*' * 80)
def validate(Dataset, model, criterion, epoch, writer, device, save_path, args):
"""
Evaluates/validates the model
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be evaluated/validated
criterion (torch.nn.criterion): Loss function
epoch (int): Epoch counter
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
save_path (str): path to save data to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int), epochs (int), incremental_data (bool), autoregression (bool),
visualization_epoch (int), num_base_tasks (int), num_increment_tasks (int) and
patch_size (int).
Returns:
float: top1 precision/accuracy
float: average loss
"""
# initialize average meters to accumulate values
class_losses = AverageMeter()
recon_losses_nat = AverageMeter()
kld_losses = AverageMeter()
losses = AverageMeter()
# for autoregressive models add an additional instance for reconstruction loss in bits per dimension
if args.autoregression:
recon_losses_bits_per_dim = AverageMeter()
# for continual learning settings also add instances for base and new reconstruction metrics
# corresponding accuracy values are calculated directly from the confusion matrix below
if args.incremental_data and ((epoch + 1) % args.epochs == 0 and epoch > 0):
recon_losses_new_nat = AverageMeter()
recon_losses_base_nat = AverageMeter()
if args.autoregression:
recon_losses_new_bits_per_dim = AverageMeter()
recon_losses_base_bits_per_dim = AverageMeter()
batch_time = AverageMeter()
top1 = AverageMeter()
# confusion matrix
confusion = ConfusionMeter(model.module.num_classes, normalized=True)
# switch to evaluate mode
model.eval()
end = time.time()
# evaluate the entire validation dataset
with torch.no_grad():
for i, (inp, target) in enumerate(Dataset.val_loader):
inp = inp.to(device)
target = target.to(device)
recon_target = inp
class_target = target
# compute output
class_samples, recon_samples, mu, std = model(inp)
# for autoregressive models convert the target to 0-255 integers and compute the autoregressive decoder
# for each sample
if args.autoregression:
recon_target = (recon_target * 255).long()
recon_samples_autoregression = torch.zeros(recon_samples.size(0), inp.size(0), 256, inp.size(1),
inp.size(2), inp.size(3)).to(device)
for j in range(model.module.num_samples):
recon_samples_autoregression[j] = model.module.pixelcnn(
inp, torch.sigmoid(recon_samples[j])).contiguous()
recon_samples = recon_samples_autoregression
# compute loss
class_loss, recon_loss, kld_loss = criterion(class_samples, class_target, recon_samples, recon_target, mu,
std, device, args)
# For autoregressive models also update the bits per dimension value, converted from the obtained nats
if args.autoregression:
recon_losses_bits_per_dim.update(recon_loss.item() * math.log2(math.e), inp.size(0))
# take mean to compute accuracy
# (does nothing if there isn't more than 1 sample per input other than removing dummy dimension)
class_output = torch.mean(class_samples, dim=0)
recon_output = torch.mean(recon_samples, dim=0)
# measure accuracy, record loss, fill confusion matrix
prec1 = accuracy(class_output, target)[0]
top1.update(prec1.item(), inp.size(0))
confusion.add(class_output.data, target)
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# for autoregressive models generate reconstructions by sequential sampling from the
# multinomial distribution (Reminder: the original output is a 255 way Softmax as PixelVAEs are posed as a
# classification problem). This serves two purposes: visualization of reconstructions and computation of
# a reconstruction loss in nats using a BCE loss, comparable to that of a regular VAE.
recon_target = inp
if args.autoregression:
recon = torch.zeros((inp.size(0), inp.size(1), inp.size(2), inp.size(3))).to(device)
for h in range(inp.size(2)):
for w in range(inp.size(3)):
for c in range(inp.size(1)):
probs = torch.softmax(recon_output[:, :, c, h, w], dim=1).data
pixel_sample = torch.multinomial(probs, 1).float() / 255.
recon[:, c, h, w] = pixel_sample.squeeze()
if (epoch % args.visualization_epoch == 0) and (i == (len(Dataset.val_loader) - 1)) and (epoch > 0):
visualize_image_grid(recon, writer, epoch + 1, 'reconstruction_snapshot', save_path)
recon_loss = F.binary_cross_entropy(recon, recon_target)
else:
# If not autoregressive simply apply the Sigmoid and visualize
recon = torch.sigmoid(recon_output)
if (i == (len(Dataset.val_loader) - 1)) and (epoch % args.visualization_epoch == 0) and (epoch > 0):
visualize_image_grid(recon, writer, epoch + 1, 'reconstruction_snapshot', save_path)
# update the respective loss values. To be consistent with values reported in the literature we scale
# our normalized losses back to un-normalized values.
# For the KLD this also means the reported loss is not scaled by beta, to allow for a fair comparison
# across potential weighting terms.
class_losses.update(class_loss.item() * model.module.num_classes, inp.size(0))
kld_losses.update(kld_loss.item() * model.module.latent_dim, inp.size(0))
recon_losses_nat.update(recon_loss.item() * inp.size()[1:].numel(), inp.size(0))
losses.update((class_loss + recon_loss + kld_loss).item(), inp.size(0))
# if we are learning continually, we need to calculate the base and new reconstruction losses at the end
# of each task increment.
if args.incremental_data and ((epoch + 1) % args.epochs == 0 and epoch > 0):
for j in range(inp.size(0)):
# get the number of classes for class incremental scenarios.
base_classes = model.module.seen_tasks[:args.num_base_tasks + 1]
new_classes = model.module.seen_tasks[-args.num_increment_tasks:]
if args.autoregression:
rec = recon_output[j].view(1, recon_output.size(1), recon_output.size(2),
recon_output.size(3), recon_output.size(4))
rec_tar = recon_target[j].view(1, recon_target.size(1), recon_target.size(2),
recon_target.size(3))
# If the input belongs to one of the base classes also update base metrics
if class_target[j].item() in base_classes:
if args.autoregression:
recon_losses_base_bits_per_dim.update(F.cross_entropy(rec, (rec_tar * 255).long()) *
math.log2(math.e), 1)
recon_losses_base_nat.update(F.binary_cross_entropy(recon[j], recon_target[j]), 1)
# if the input belongs to one of the new classes also update new metrics
elif class_target[j].item() in new_classes:
if args.autoregression:
recon_losses_new_bits_per_dim.update(F.cross_entropy(rec, (rec_tar * 255).long()) *
math.log2(math.e), 1)
recon_losses_new_nat.update(F.binary_cross_entropy(recon[j], recon_target[j]), 1)
# If we are at the end of validation, create one mini-batch of example generations. Only do this every
# other epoch specified by visualization_epoch to avoid generation of lots of images and computationally
# expensive calculations of the autoregressive model's generation.
if i == (len(Dataset.val_loader) - 1) and epoch % args.visualization_epoch == 0 and (epoch > 0):
# generation
gen = model.module.generate()
if args.autoregression:
gen = model.module.pixelcnn.generate(gen)
visualize_image_grid(gen, writer, epoch + 1, 'generation_snapshot', save_path)
# Print progress
if i % args.print_freq == 0:
print('Validate: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch+1, i, len(Dataset.val_loader), batch_time=batch_time, loss=losses, cl_loss=class_losses,
top1=top1, recon_loss=recon_losses_nat, KLD_loss=kld_losses))
# TensorBoard summary logging
writer.add_scalar('validation/val_precision@1', top1.avg, epoch)
writer.add_scalar('validation/val_average_loss', losses.avg, epoch)
writer.add_scalar('validation/val_class_loss', class_losses.avg, epoch)
writer.add_scalar('validation/val_recon_loss_nat', recon_losses_nat.avg, epoch)
writer.add_scalar('validation/val_KLD', kld_losses.avg, epoch)
if args.autoregression:
writer.add_scalar('validation/val_recon_loss_bits_per_dim', recon_losses_bits_per_dim.avg, epoch)
print(' * Validation: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}'.format(loss=losses, top1=top1))
# At the end of training isolated, or at the end of every task visualize the confusion matrix
if (epoch + 1) % args.epochs == 0 and epoch > 0:
# visualize the confusion matrix
visualize_confusion(writer, epoch + 1, confusion.value(), Dataset.class_to_idx, save_path)
# If we are in a continual learning scenario, also use the confusion matrix to extract base and new precision.
if args.incremental_data:
prec1_base = 0.0
prec1_new = 0.0
# this has to be + 1 because the number of initial tasks is always one less than the amount of classes
# i.e. 1 task is 2 classes etc.
for c in range(args.num_base_tasks + 1):
prec1_base += confusion.value()[c][c]
prec1_base = prec1_base / (args.num_base_tasks + 1)
# For the first task "new" metrics are equivalent to "base"
if (epoch + 1) / args.epochs == 1:
prec1_new = prec1_base
recon_losses_new_nat.avg = recon_losses_base_nat.avg
if args.autoregression:
recon_losses_new_bits_per_dim.avg = recon_losses_base_bits_per_dim.avg
else:
for c in range(args.num_increment_tasks):
prec1_new += confusion.value()[-c-1][-c-1]
prec1_new = prec1_new / args.num_increment_tasks
# At the continual learning metrics to TensorBoard
writer.add_scalar('validation/base_precision@1', prec1_base, len(model.module.seen_tasks)-1)
writer.add_scalar('validation/new_precision@1', prec1_new, len(model.module.seen_tasks)-1)
writer.add_scalar('validation/base_rec_loss_nats', recon_losses_base_nat.avg * args.patch_size *
args.patch_size * model.module.num_colors, len(model.module.seen_tasks) - 1)
writer.add_scalar('validation/new_rec_loss_nats', recon_losses_new_nat.avg * args.patch_size *
args.patch_size * model.module.num_colors, len(model.module.seen_tasks) - 1)
if args.autoregression:
writer.add_scalar('validation/base_rec_loss_bits_per_dim',
recon_losses_base_bits_per_dim.avg, len(model.module.seen_tasks) - 1)
writer.add_scalar('validation/new_rec_loss_bits_per_dim',
recon_losses_new_bits_per_dim.avg, len(model.module.seen_tasks) - 1)
print(' * Incremental validation: Base Prec@1 {prec1_base:.3f} New Prec@1 {prec1_new:.3f}\t'
'Base Recon Loss {recon_losses_base_nat.avg:.3f} New Recon Loss {recon_losses_new_nat.avg:.3f}'
.format(prec1_base=100*prec1_base, prec1_new=100*prec1_new,
recon_losses_base_nat=recon_losses_base_nat, recon_losses_new_nat=recon_losses_new_nat))
return top1.avg, losses.avg
def train_var(Dataset, model, criterion, epoch, optimizer, writer, device,
args):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int), denoising_noise_value (float) and var_beta (float).
"""
# Create instances to accumulate losses etc.
cl_losses = AverageMeter()
kld_losses = AverageMeter()
losses = AverageMeter()
batch_time = AverageMeter()
data_time = AverageMeter()
top1 = AverageMeter()
# switch to train mode
model.train()
end = time.time()
# train
for i, (inp, target) in enumerate(Dataset.train_loader):
inp = inp.to(device)
target = target.to(device)
# measure data loading time
data_time.update(time.time() - end)
# compute model forward
output_samples, mu, std = model(inp)
# calculate loss
cl_loss, kld_loss = criterion(output_samples, target, mu, std, device)
# add the individual loss components together and weight the KL term.
loss = cl_loss + args.var_beta * kld_loss
# take mean to compute accuracy. Note if variational samples are 1 this only gets rid of a dummy dimension.
output = torch.mean(output_samples, dim=0)
# record precision/accuracy and losses
prec1 = accuracy(output, target)[0]
top1.update(prec1.item(), inp.size(0))
losses.update((cl_loss + kld_loss).item(), inp.size(0))
cl_losses.update(cl_loss.item(), inp.size(0))
kld_losses.update(kld_loss.item(), inp.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print progress
if i % args.print_freq == 0:
print('Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch + 1,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=cl_losses,
top1=top1,
KLD_loss=kld_losses))
# TensorBoard summary logging
writer.add_scalar('training/train_precision@1', top1.avg, epoch)
writer.add_scalar('training/train_class_loss', cl_losses.avg, epoch)
writer.add_scalar('training/train_average_loss', losses.avg, epoch)
writer.add_scalar('training/train_KLD', kld_losses.avg, epoch)
print(' * Train: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}'.format(
loss=losses, top1=top1))
def train(Dataset, model, criterion, epoch, optimizer, writer, device, args):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int) and log_weights (bool).
"""
# Create instances to accumulate losses etc.
losses = AverageMeter()
class_losses = AverageMeter()
inos_losses = AverageMeter()
batch_time = AverageMeter()
data_time = AverageMeter()
top1 = AverageMeter()
# switch to train mode
model.train()
end = time.time()
# train
for i, (inp, target) in enumerate(Dataset.train_loader):
inp = inp.to(device)
target = target.to(device)
class_target = target[0]
# measure data loading time
data_time.update(time.time() - end)
# compute model forward
output, score = model(inp)
# calculate loss
cl, rl = criterion(output, target, score, device, args)
loss = cl + rl
# record precision/accuracy and losses
prec1 = accuracy(output, class_target)[0]
top1.update(prec1.item(), inp.size(0))
class_losses.update(cl.item(), inp.size(0))
inos_losses.update(rl.item(), inp.size(0))
losses.update(loss.item(), inp.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print progress
if i % args.print_freq == 0:
print('Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'.format(
epoch + 1,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
top1=top1))
# TensorBoard summary logging
writer.add_scalar('train/precision@1', top1.avg, epoch)
writer.add_scalar('train/average_loss', losses.avg, epoch)
writer.add_scalar('train/class_loss', class_losses.avg, epoch)
writer.add_scalar('train/inos_loss', inos_losses.avg, epoch)
# If the log weights argument is specified also add parameter and gradient histograms to TensorBoard.
if args.log_weights:
# Histograms and distributions of network parameters
for tag, value in model.named_parameters():
tag = tag.replace('.', '/')
writer.add_histogram(tag,
value.data.cpu().numpy(),
epoch,
bins="auto")
# second check required for buffers that appear in the parameters dict but don't receive gradients
if value.requires_grad and value.grad is not None:
writer.add_histogram(tag + '/grad',
value.grad.data.cpu().numpy(),
epoch,
bins="auto")
print(' * Train: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}'.format(
loss=losses, top1=top1))
def train(dataset, model, criterion, epoch, optimizer, lr_scheduler, device,
args):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
train_loader (torch.utils.data.DataLoader): The trainset dataloader
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
lr_scheduler (Training.LearningRateScheduler): class implementing learning rate schedules
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain learning_rate (float), momentum (float),
weight_decay (float), nesterov momentum (bool), lr_dropstep (int),
lr_dropfactor (float), print_freq (int) and expand (bool).
"""
batch_time = AverageMeter()
data_time = AverageMeter()
cl_losses = AverageMeter()
top1 = AverageMeter()
top5 = AverageMeter()
# switch to train mode
model.train()
end = time.time()
for i, (input, target) in enumerate(dataset.train_loader):
input, target = input.to(device), target.to(device)
# measure data loading time
data_time.update(time.time() - end)
# adjust the learning rate if applicable
lr_scheduler.adjust_learning_rate(optimizer, i + 1)
# compute output
output = model(input)
# making targets one-hot for using BCEloss
target_temp = target
one_hot = torch.zeros(target.size(0), output.size(1)).to(device)
one_hot.scatter_(1, target.long().view(target.size(0), -1), 1)
target = one_hot
# compute loss and accuracy
loss = criterion(output, target)
prec1, prec5 = accuracy(output, target_temp, (1, 5))
# measure accuracy and record loss
cl_losses.update(loss.item(), input.size(0))
prec1, prec5 = accuracy(output, target_temp, (1, 5))
top1.update(prec1.item(), input.size(0))
top5.update(prec5.item(), input.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
del output, input, target
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
print('Epoch: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Prec@5 {top5.val:.3f} ({top5.avg:.3f})\t'.format(
epoch,
i,
len(dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=cl_losses,
top1=top1,
top5=top5))
lr_scheduler.scheduler_epoch += 1
print(' * Train: Prec@1 {top1.avg:.3f} Prec@5 {top5.avg:.3f}'.format(
top1=top1, top5=top5))
print('=' * 80)
def validate_var(Dataset, model, criterion, epoch, writer, device, args):
"""
Evaluates/validates the model
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be evaluated/validated
criterion (torch.nn.criterion): Loss function
epoch (int): Epoch counter
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int), epochs (int) and patch_size (int).
Returns:
float: top1 precision/accuracy
float: average loss
"""
# initialize average meters to accumulate values
cl_losses = AverageMeter()
kld_losses = AverageMeter()
losses = AverageMeter()
batch_time = AverageMeter()
top1 = AverageMeter()
# switch to evaluate mode
model.eval()
end = time.time()
# evaluate the entire validation dataset
with torch.no_grad():
for i, (inp, target) in enumerate(Dataset.val_loader):
inp = inp.to(device)
target = target.to(device)
# compute output
output_samples, mu, std = model(inp)
# compute loss
cl_loss, kld_loss = criterion(output_samples, target, mu, std,
device)
# take mean to compute accuracy
# (does nothing if there isn't more than 1 sample per input other than removing dummy dimension)
output = torch.mean(output_samples, dim=0)
# measure and update accuracy
prec1 = accuracy(output, target)[0]
top1.update(prec1.item(), inp.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# update the respective loss values. To be consistent with values reported in the literature we scale
# our normalized losses back to un-normalized values.
# For the KLD this also means the reported loss is not scaled by beta, to allow for a fair comparison
# across potential weighting terms.
cl_losses.update(cl_loss.item() * model.module.num_classes,
inp.size(0))
kld_losses.update(kld_loss.item() * model.module.latent_dim,
inp.size(0))
losses.update((cl_loss + kld_loss).item(), inp.size(0))
# Print progress
if i % args.print_freq == 0:
print('Validate: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch + 1,
i,
len(Dataset.val_loader),
batch_time=batch_time,
loss=losses,
cl_loss=cl_losses,
top1=top1,
KLD_loss=kld_losses))
# TensorBoard summary logging
writer.add_scalar('validation/val_precision@1', top1.avg, epoch)
writer.add_scalar('validation/val_class_loss', cl_losses.avg, epoch)
writer.add_scalar('validation/val_average_loss', losses.avg, epoch)
writer.add_scalar('validation/val_KLD', kld_losses.avg, epoch)
print(' * Validation: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}'.format(
loss=losses, top1=top1))
return top1.avg, losses.avg
def train(dataset, gen_model, disc_model, criterion, epoch, gen_optimizer,
disc_optimizer, lr_scheduler, device, args):
gen_losses = AverageMeter()
disc_losses = AverageMeter()
batch_time = AverageMeter()
data_time = AverageMeter()
gen_model.train()
disc_model.train()
end = time.time()
for i, (input, target) in enumerate(dataset.train_loader):
input, target = input.to(device), input.to(device)
data_time.update(time.time() - end)
lr_scheduler.adjust_learning_rate(gen_optimizer, i + 1)
lr_scheduler.adjust_learning_rate(disc_optimizer, i + 1)
if args.no_gpus > 1:
input_size = gen_model.module.input_size
else:
input_size = gen_model.input_size
# set inputs and targets
z = torch.randn((input.size(0), input_size)).to(device)
y_real, y_fake = torch.ones(input.size(0), 1).to(device), torch.zeros(
input.size(0), 1).to(device)
disc_real = disc_model(input)
gen_out = gen_model(z)
disc_fake = disc_model(gen_out)
disc_real_loss = criterion(disc_real, y_real)
disc_fake_loss = criterion(disc_fake, y_fake)
disc_loss = disc_real_loss + disc_fake_loss
disc_losses.update(disc_loss.item(), input.size(0))
disc_optimizer.zero_grad()
disc_loss.backward()
disc_optimizer.step()
gen_out = gen_model(z)
disc_fake = disc_model(gen_out)
gen_loss = criterion(disc_fake, y_real)
gen_losses.update(gen_loss.item(), input.size(0))
gen_optimizer.zero_grad()
gen_loss.backward()
gen_optimizer.step()
del input, target, z, y_real, y_fake, disc_real, gen_out, disc_fake
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
print(
'Epoch: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Generator Loss {gen_losses.val:.4f} ({gen_losses.avg:.4f})\t'
'Discriminator Loss {disc_losses.val:.3f} ({disc_losses.avg:.3f})\t'
.format(epoch,
i,
len(dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
gen_losses=gen_losses,
disc_losses=disc_losses))
print(' * Train: Generator Loss {gen_losses.avg:.3f} Discriminator Loss {disc_losses.avg:.3f}'\
.format(gen_losses=gen_losses, disc_losses=disc_losses))
print('-' * 80)
return disc_losses.avg, gen_losses.avg
def validate(val_loader, model, criterion, epoch, device, args):
"""
Evaluates/validates the model
Parameters:
val_loader (torch.utils.data.DataLoader): The validation or testset dataloader
model (torch.nn.module): Model to be evaluated/validated
criterion (torch.nn.criterion): Loss function
epoch (int): Epoch counter
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int).
Returns:
float: top1 accuracy
"""
batch_time = AverageMeter()
losses = AverageMeter()
top1 = AverageMeter()
top5 = AverageMeter()
# switch to evaluate mode
model.eval()
end = time.time()
with torch.no_grad():
for i, (inp, target) in enumerate(val_loader):
inp, target = inp.to(device), target.to(device)
# compute output
output = model(inp)
# compute loss
loss = criterion(output, target)
# measure accuracy and record loss
prec1, prec5 = accuracy(output, target, topk=(1, 5))
losses.update(loss.item(), inp.size(0))
top1.update(prec1.item(), inp.size(0))
top5.update(prec5.item(), inp.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
print('Validate: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Prec@5 {top5.val:.3f} ({top5.avg:.3f})'.format(
epoch + 1,
i,
len(val_loader),
batch_time=batch_time,
loss=losses,
top1=top1,
top5=top5))
print(' * Validation: Prec@1 {top1.avg:.3f} Prec@5 {top5.avg:.3f}'.format(
top1=top1, top5=top5))
return top1.avg
def val(val_loader, model, criterion, device, is_val=True):
"""
validates the model of a net for one epoch on the validation set
Parameters:
val_loader (torch.utils.data.DataLoader): data loader for the validation set
model (lib.Models.network.Net): model of a net that has to be validated
criterion (torch.nn.BCELoss): loss criterion
device (torch.device): device name where data is transferred to
is_val (bool): validation or testing mode
Returns:
losses.avg (float): average of the validation losses over the batches
hard_prec.avg (float): average of the validation hard precision over the batches for all the defects
soft_prec.avg (float): average of the validation soft precision over the batches for all the defects
hard_prec_background.avg (float): average of the validation hard/soft precision over the batches for background
hard_prec_crack.avg (float): average of the validation hard/soft precision over the batches for crack
hard_prec_spallation.avg (float): average of the validation hard/soft precision over the batches for spallation
hard_prec_exposed_bars.avg (float): average of the validation hard/soft precision over the batches for exposed
bars
hard_prec_efflorescence.avg (float): average of the validation hard/soft precision over the batches for
efflorescence
hard_prec_corrosion_stain.avg (float): average of the validation hard/soft precision over the batches for
corrosion stain
"""
# performance metrics
losses = AverageMeter()
hard_prec = AverageMeter()
soft_prec = AverageMeter()
hard_prec_background = AverageMeter()
hard_prec_crack = AverageMeter()
hard_prec_spallation = AverageMeter()
hard_prec_exposed_bars = AverageMeter()
hard_prec_efflorescence = AverageMeter()
hard_prec_corrosion_stain = AverageMeter()
# for computing correct prediction percentage for multi-label samples and single-label samples
number_multi_label_samples = number_correct_multi_label_predictions = number_single_label_samples =\
number_correct_single_label_predictions = 0
# switch to evaluate mode
model.eval()
if is_val:
print('validating')
else:
print('testing')
# to ensure no buffering for gradient updates
with torch.no_grad():
for i, (input_, target) in enumerate(val_loader):
if input_.size(0) == 1:
# hacky way to deal with terminal batch-size of 1
print('skip last val/test batch of size 1')
continue
input_, target = input_.to(device), target.to(device)
output = model(input_)
loss = criterion(output, target)
# update the 'losses' meter
losses.update(loss.item(), input_.size(0))
# compute performance measures
output = output >= 0.5 # binarizing sigmoid output by thresholding with 0.5
temp_output = output
temp_output = temp_output.float() + (((torch.sum(
temp_output.float(), dim=1, keepdim=True) == 0).float()) * 0.5)
# compute correct prediction percentage for multi-label/single-label samples
sum_target_along_label_dimension = torch.sum(target,
dim=1,
keepdim=True)
multi_label_samples = (sum_target_along_label_dimension >
1).float()
target_multi_label_samples = (target.float()) * multi_label_samples
number_multi_label_samples += torch.sum(multi_label_samples).item()
number_correct_multi_label_predictions += \
torch.sum(torch.prod((temp_output.float() == target_multi_label_samples).float(), dim=1)).item()
single_label_samples = (
sum_target_along_label_dimension == 1).float()
target_single_label_samples = (
target.float()) * single_label_samples
number_single_label_samples += torch.sum(
single_label_samples).item()
number_correct_single_label_predictions += \
torch.sum(torch.prod((temp_output.float() == target_single_label_samples).float(), dim=1)).item()
equality_matrix = (output.float() == target).float()
hard = torch.mean(torch.prod(equality_matrix, dim=1)) * 100.
soft = torch.mean(equality_matrix) * 100.
hard_per_defect = torch.mean(equality_matrix, dim=0) * 100.
# update peformance meters
hard_prec.update(hard.item(), input_.size(0))
soft_prec.update(soft.item(), input_.size(0))
hard_prec_background.update(hard_per_defect[0].item(),
input_.size(0))
hard_prec_crack.update(hard_per_defect[1].item(), input_.size(0))
hard_prec_spallation.update(hard_per_defect[2].item(),
input_.size(0))
hard_prec_exposed_bars.update(hard_per_defect[3].item(),
input_.size(0))
hard_prec_efflorescence.update(hard_per_defect[4].item(),
input_.size(0))
hard_prec_corrosion_stain.update(hard_per_defect[5].item(),
input_.size(0))
percentage_single_labels = (100. * number_correct_single_label_predictions
) / number_single_label_samples
percentage_multi_labels = (100. * number_correct_multi_label_predictions
) / number_multi_label_samples
if is_val:
print(
' * val: loss {losses.avg:.3f}, hard prec {hard_prec.avg:.3f}, soft prec {soft_prec.avg:.3f},\t'
'% correct single-label predictions {percentage_single_labels:.3f}, % correct multi-label predictions'
'{percentage_multi_labels:.3f},\t'
'hard prec background {hard_prec_background.avg:.3f}, hard prec crack {hard_prec_crack.avg:.3f},\t'
'hard prec spallation {hard_prec_spallation.avg:.3f}, '
'hard prec exposed bars {hard_prec_exposed_bars.avg:.3f},\t'
'hard prec efflorescence {hard_prec_efflorescence.avg:.3f}, hard prec corrosion stain'
' {hard_prec_corrosion_stain.avg:.3f}\t'.format(
losses=losses,
hard_prec=hard_prec,
soft_prec=soft_prec,
percentage_single_labels=percentage_single_labels,
percentage_multi_labels=percentage_multi_labels,
hard_prec_background=hard_prec_background,
hard_prec_crack=hard_prec_crack,
hard_prec_spallation=hard_prec_spallation,
hard_prec_exposed_bars=hard_prec_exposed_bars,
hard_prec_efflorescence=hard_prec_efflorescence,
hard_prec_corrosion_stain=hard_prec_corrosion_stain))
print('*' * 80)
else:
print(
' * test: loss {losses.avg:.3f}, hard prec {hard_prec.avg:.3f}, soft prec {soft_prec.avg:.3f},\t'
'% correct single-label predictions {percentage_single_labels:.3f}, % correct multi-label predictions'
'{percentage_multi_labels:.3f},\t'
'hard prec background {hard_prec_background.avg:.3f}, hard prec crack {hard_prec_crack.avg:.3f},\t'
'hard prec spallation {hard_prec_spallation.avg:.3f}, '
'hard prec exposed bars {hard_prec_exposed_bars.avg:.3f},\t'
'hard prec efflorescence {hard_prec_efflorescence.avg:.3f}, hard prec corrosion stain'
'{hard_prec_corrosion_stain.avg:.3f}\t'.format(
losses=losses,
hard_prec=hard_prec,
soft_prec=soft_prec,
percentage_single_labels=percentage_single_labels,
percentage_multi_labels=percentage_multi_labels,
hard_prec_background=hard_prec_background,
hard_prec_crack=hard_prec_crack,
hard_prec_spallation=hard_prec_spallation,
hard_prec_exposed_bars=hard_prec_exposed_bars,
hard_prec_efflorescence=hard_prec_efflorescence,
hard_prec_corrosion_stain=hard_prec_corrosion_stain))
print('*' * 80)
if is_val:
return losses.avg, hard_prec.avg, soft_prec.avg, hard_prec_background.avg, hard_prec_crack.avg,\
hard_prec_spallation.avg, hard_prec_exposed_bars.avg, hard_prec_exposed_bars.avg,\
hard_prec_corrosion_stain.avg
else:
return None
def train(Dataset, model, criterion, epoch, optimizer, writer, device, args):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int) and log_weights (bool).
"""
# Create instances to accumulate losses etc.
class_losses = AverageMeter()
recon_losses = AverageMeter()
kld_losses = AverageMeter()
losses = AverageMeter()
batch_time = AverageMeter()
data_time = AverageMeter()
top1 = AverageMeter()
# switch to train mode
model.train()
end = time.time()
# train
for i, (inp, target) in enumerate(Dataset.train_loader):
inp = inp.to(device)
target = target.to(device)
recon_target = inp
class_target = target
# this needs to be below the line where the reconstruction target is set
# sample and add noise to the input (but not to the target!).
if args.denoising_noise_value > 0.0:
noise = torch.randn(
inp.size()).to(device) * args.denoising_noise_value
inp = inp + noise
# measure data loading time
data_time.update(time.time() - end)
# compute model forward
class_samples, recon_samples, mu, std = model(inp)
# if we have an autoregressive model variant, further calculate the corresponding layers.
if args.autoregression:
recon_samples_autoregression = torch.zeros(recon_samples.size(0),
inp.size(0), 256,
inp.size(1),
inp.size(2),
inp.size(3)).to(device)
for j in range(model.module.num_samples):
recon_samples_autoregression[j] = model.module.pixelcnn(
recon_target,
torch.sigmoid(recon_samples[j])).contiguous()
recon_samples = recon_samples_autoregression
# set the target to work with the 256-way Softmax
recon_target = (recon_target * 255).long()
# calculate loss
class_loss, recon_loss, kld_loss = criterion(class_samples,
class_target,
recon_samples,
recon_target, mu, std,
device, args)
# add the individual loss components together and weight the KL term.
loss = class_loss + recon_loss + args.var_beta * kld_loss
# take mean to compute accuracy. Note if variational samples are 1 this only gets rid of a dummy dimension.
output = torch.mean(class_samples, dim=0)
# record precision/accuracy and losses
prec1 = accuracy(output, target)[0]
top1.update(prec1.item(), inp.size(0))
losses.update((class_loss + recon_loss + kld_loss).item(), inp.size(0))
class_losses.update(class_loss.item(), inp.size(0))
recon_losses.update(recon_loss.item(), inp.size(0))
kld_losses.update(kld_loss.item(), inp.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print progress
if i % args.print_freq == 0:
print('Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch + 1,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=class_losses,
top1=top1,
recon_loss=recon_losses,
KLD_loss=kld_losses))
# TensorBoard summary logging
writer.add_scalar('training/train_precision@1', top1.avg, epoch)
writer.add_scalar('training/train_average_loss', losses.avg, epoch)
writer.add_scalar('training/train_KLD', kld_losses.avg, epoch)
writer.add_scalar('training/train_class_loss', class_losses.avg, epoch)
writer.add_scalar('training/train_recon_loss', recon_losses.avg, epoch)
# If the log weights argument is specified also add parameter and gradient histograms to TensorBoard.
if args.log_weights:
# Histograms and distributions of network parameters
for tag, value in model.named_parameters():
tag = tag.replace('.', '/')
writer.add_histogram(tag,
value.data.cpu().numpy(),
epoch,
bins="auto")
# second check required for buffers that appear in the parameters dict but don't receive gradients
if value.requires_grad and value.grad is not None:
writer.add_histogram(tag + '/grad',
value.grad.data.cpu().numpy(),
epoch,
bins="auto")
print(' * Train: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}'.format(
loss=losses, top1=top1))
def train(dataset, model, criterion, epoch, optimizer, lr_scheduler, device, args):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
train_loader (torch.utils.data.DataLoader): The trainset dataloader
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
lr_scheduler (Training.LearningRateScheduler): class implementing learning rate schedules
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain learning_rate (float), momentum (float),
weight_decay (float), nesterov momentum (bool), lr_dropstep (int),
lr_dropfactor (float), print_freq (int) and expand (bool).
"""
batch_time = AverageMeter()
data_time = AverageMeter()
elbo_losses = AverageMeter()
rec_losses = AverageMeter()
kl_losses = AverageMeter()
# switch to train mode
model.train()
end = time.time()
for i, (input, target) in enumerate(dataset.train_loader):
input, target = input.to(device), input.to(device)
# measure data loading time
data_time.update(time.time() - end)
# adjust the learning rate if applicable
lr_scheduler.adjust_learning_rate(optimizer, i + 1)
# compute output, mean and std
output, mean, std = model(input)
# compute loss
kl_loss = -0.5*torch.mean(1+torch.log(1e-8+std**2)-(mean**2)-(std**2))
rec_loss = criterion(output, target)
elbo_loss = rec_loss + kl_loss
# record loss
rec_losses.update(rec_loss.item(), input.size(0))
kl_losses.update(kl_loss.item(), input.size(0))
elbo_losses.update(elbo_loss.item(), input.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
elbo_loss.backward()
optimizer.step()
del output, input, target
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
print('Epoch: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'ELBO Loss {elbo_losses.val:.4f} ({elbo_losses.avg:.4f})\t'
'Reconstruction Loss {rec_losses.val:.3f} ({rec_losses.avg:.3f})\t'
'KL Divergence {kl_losses.val:.3f} ({kl_losses.avg:.3f})\t'.format(
epoch, i, len(dataset.train_loader), batch_time=batch_time,
data_time=data_time, elbo_losses=elbo_losses, rec_losses=rec_losses, kl_losses=kl_losses))
lr_scheduler.scheduler_epoch += 1
print(' * Train: ELBO Loss {elbo_losses.avg:.3f} Reconstruction Loss {rec_losses.avg:.3f} KL Divergence {kl_losses.avg:.3f}'\
.format(elbo_losses=elbo_losses, rec_losses=rec_losses, kl_losses=kl_losses))
print('-' * 80)
def validate(dataset, model, criterion, epoch, device, args,
save_path_pictures):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
train_loader (torch.utils.data.DataLoader): The trainset dataloader
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain learning_rate (float), momentum (float),
weight_decay (float), nesterov momentum (bool), lr_dropstep (int),
lr_dropfactor (float), print_freq (int) and expand (bool).
"""
elbo_losses = AverageMeter()
rec_losses = AverageMeter()
kl_losses = AverageMeter()
# switch to train mode
model.eval()
for i, (input, target) in enumerate(dataset.train_loader):
with torch.no_grad():
input, target = input.to(device), input.to(device)
# compute output, mean and std
output, mean, std = model(input)
# compute loss
kl_loss = -0.5 * torch.mean(1 + torch.log(1e-8 + std**2) -
(mean**2) - (std**2))
rec_loss = criterion(output, target)
elbo_loss = rec_loss + kl_loss
# record loss
rec_losses.update(rec_loss.item(), input.size(0))
kl_losses.update(kl_loss.item(), input.size(0))
elbo_losses.update(elbo_loss.item(), input.size(0))
if i % args.print_freq == 0:
save_image((input.data).view(-1, input.size(1), input.size(2),
input.size(3)),
os.path.join(
save_path_pictures, 'input_epoch_' +
str(epoch) + '_ite_' + str(i + 1) + '.png'))
save_image(
(output.data).view(-1, output.size(1), output.size(2),
output.size(3)),
os.path.join(
save_path_pictures,
'epoch_' + str(epoch) + '_ite_' + str(i + 1) + '.png'))
if args.no_gpus > 1:
sample = torch.randn(input.size(0),
model.module.latent_size).to(device)
sample = model.module.sample(sample).cpu()
else:
sample = torch.randn(input.size(0),
model.latent_size).to(device)
sample = model.sample(sample).cpu()
save_image((sample.view(-1, input.size(1), input.size(2),
input.size(3))),
os.path.join(
save_path_pictures, 'sample_epoch_' +
str(epoch) + '_ite_' + str(i + 1) + '.png'))
del output, input, target
print(' * Validate: ELBO Loss {elbo_losses.avg:.3f} Reconstruction Loss {rec_losses.avg:.3f} KL Divergence {kl_losses.avg:.3f}'\
.format(elbo_losses=elbo_losses, rec_losses=rec_losses, kl_losses=kl_losses))
print('-' * 80)
return 1. / elbo_losses.avg
def train(Dataset, model, criterion, epoch, optimizer, writer, device,
save_path, args):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int) and log_weights (bool).
"""
# Create instances to accumulate losses etc.
class_losses = AverageMeter()
recon_losses = AverageMeter()
kld_losses = AverageMeter()
losses = AverageMeter()
batch_time = AverageMeter()
data_time = AverageMeter()
G_losses = AverageMeter()
gp_losses = AverageMeter()
D_losses = AverageMeter()
D_losses_real = AverageMeter()
D_losses_fake = AverageMeter()
G_losses_fake = AverageMeter()
fake_class_losses = AverageMeter()
top1 = AverageMeter()
# switch to train mode
model.train()
GAN_criterion = torch.nn.BCEWithLogitsLoss()
end = time.time()
# train
for i, (inp, target) in enumerate(Dataset.train_loader):
inp = inp.to(device)
target = target.to(device)
recon_target = inp
class_target = target
# this needs to be below the line where the reconstruction target is set
# sample and add noise to the input (but not to the target!).
if args.denoising_noise_value > 0.0:
noise = torch.randn(
inp.size()).to(device) * args.denoising_noise_value
inp = inp + noise
if args.blur:
inp = blur_data(inp, args.patch_size, device)
# measure data loading time
data_time.update(time.time() - end)
# Model explanation: Conventionally GAN architecutre update D first and G
#### D Update####
class_samples, recon_samples, mu, std = model(inp)
mu_label = None
if args.proj_gan:
# pred_label = torch.argmax(class_samples, dim=-1).squeeze()
# mu_label = pred_label.to(device)
mu_label = target
real_z = model.module.forward_D(recon_target, mu_label)
D_loss_real = torch.mean(torch.nn.functional.relu(1. - real_z)) #hinge
# D_loss_real = - torch.mean(real_z) #WGAN-GP
D_losses_real.update(D_loss_real.item(), 1)
n, b, c, x, y = recon_samples.shape
fake_z = model.module.forward_D(
(recon_samples.view(n * b, c, x, y)).detach(), mu_label)
D_loss_fake = torch.mean(torch.nn.functional.relu(1. + fake_z)) #hinge
# D_loss_fake = torch.mean(fake_z) #WGAN-GP
D_losses_fake.update(D_loss_fake.item(), 1)
GAN_D_loss = (D_loss_real + D_loss_fake)
D_losses.update(GAN_D_loss.item(), inp.size(0))
# Compute loss for gradient penalty
alpha = torch.rand(recon_target.size(0), 1, 1, 1).to(device)
x_hat = (alpha * recon_target + (1 - alpha) *
recon_samples.view(n * b, c, x, y)).requires_grad_(True)
out_x_hat = model.module.forward_D(x_hat, mu_label)
D_loss_gp = model.module.discriminator.gradient_penalty(
out_x_hat, x_hat)
gp_losses.update(D_loss_gp, inp.size(0))
GAN_D_loss += args.lambda_gp * D_loss_gp
# compute gradient and do SGD step
optimizer['enc'].zero_grad()
optimizer['dec'].zero_grad()
optimizer['disc'].zero_grad()
GAN_D_loss.backward()
optimizer['disc'].step()
#### G Update####
if i % 1 == 0:
class_samples, recon_samples, mu, std = model(inp)
mu_label = None
if args.proj_gan:
# pred_label = torch.argmax(class_samples, dim=-1).squeeze()
# mu_label = pred_label.to(device)
mu_label = target
# OCDVAE calculate loss
class_loss, recon_loss, kld_loss = criterion(
class_samples, class_target, recon_samples, recon_target, mu,
std, device, args)
# add the individual loss components together and weight the KL term.
loss = class_loss + args.l1_weight * recon_loss + args.var_beta * kld_loss
output = torch.mean(class_samples, dim=0)
# record precision/accuracy and losses
prec1 = accuracy(output, target)[0]
top1.update(prec1.item(), inp.size(0))
losses.update(loss.item(), inp.size(0))
class_losses.update(class_loss.item(), inp.size(0))
recon_losses.update(recon_loss.item(), inp.size(0))
kld_losses.update(kld_loss.item(), inp.size(0))
# Needed to add GAN_criterion on KL
n, b, c, x, y = recon_samples.shape
fake_z = model.module.forward_D(
(recon_samples.view(n * b, c, x, y)), mu_label)
GAN_G_loss = -torch.mean(fake_z)
G_losses_fake.update(GAN_G_loss.item(), inp.size(0))
GAN_G_loss = -args.var_gan_weight * torch.mean(fake_z)
G_losses.update(GAN_G_loss.item(), inp.size(0))
GAN_G_loss += loss
optimizer['enc'].zero_grad()
optimizer['dec'].zero_grad()
optimizer['disc'].zero_grad()
GAN_G_loss.backward()
optimizer['enc'].step()
optimizer['dec'].step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print progress
if i % args.print_freq == 0:
print("OCD_VAELoss: ")
print('Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch + 1,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=class_losses,
top1=top1,
recon_loss=recon_losses,
KLD_loss=kld_losses))
print("GANLoss: ")
print('G Loss {G_loss.val:.4f} ({G_loss.avg:.4f})\t'
'D Loss {D_loss.val:.4f} ({D_loss.avg:.4f})'.format(
G_loss=G_losses, D_loss=D_losses))
if (i == (len(Dataset.train_loader) -
2)) and (epoch % args.visualization_epoch == 0):
visualize_image_grid(inp, writer, epoch + 1,
'train_input_snapshot', save_path)
visualize_image_grid(recon_samples.view(n * b, c, x,
y), writer, epoch + 1,
'train_reconstruction_snapshot', save_path)
# TensorBoard summary logging
writer.add_scalar('training/train_precision@1', top1.avg, epoch)
writer.add_scalar('training/train_average_loss', losses.avg, epoch)
writer.add_scalar('training/train_KLD', kld_losses.avg, epoch)
writer.add_scalar('training/train_class_loss', class_losses.avg, epoch)
writer.add_scalar('training/train_recon_loss', recon_losses.avg, epoch)
writer.add_scalar('training/train_G_loss', G_losses.avg, epoch)
writer.add_scalar('training/train_D_loss', D_losses.avg, epoch)
writer.add_scalar('training/train_D_loss_real', D_losses_real.avg, epoch)
writer.add_scalar('training/train_D_loss_fake', D_losses_fake.avg, epoch)
writer.add_scalar('training/train_G_loss_fake', G_losses_fake.avg, epoch)
# If the log weights argument is specified also add parameter and gradient histograms to TensorBoard.
if args.log_weights:
# Histograms and distributions of network parameters
for tag, value in model.named_parameters():
tag = tag.replace('.', '/')
writer.add_histogram(tag,
value.data.cpu().numpy(),
epoch,
bins="auto")
# second check required for buffers that appear in the parameters dict but don't receive gradients
if value.requires_grad and value.grad is not None:
writer.add_histogram(tag + '/grad',
value.grad.data.cpu().numpy(),
epoch,
bins="auto")
print(
' * Train: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}\t'
' GAN: Generator {G_losses.avg:.5f} Discriminator {D_losses.avg:.4f}'.
format(loss=losses, top1=top1, G_losses=G_losses, D_losses=D_losses))
def train(Dataset, model, criterion, epoch, optimizer, writer, device, args):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int) and log_weights (bool).
"""
# Create instances to accumulate losses etc.
class_losses = AverageMeter()
recon_losses = AverageMeter()
if args.introspection:
kld_real_losses = AverageMeter()
kld_fake_losses = AverageMeter()
kld_rec_losses = AverageMeter()
criterion_enc = criterion[0]
criterion_dec = criterion[1]
optimizer_enc = optimizer[0]
optimizer_dec = optimizer[1]
else:
kld_losses = AverageMeter()
losses = AverageMeter()
batch_time = AverageMeter()
data_time = AverageMeter()
top1 = AverageMeter()
# switch to train mode
model.train()
end = time.time()
# train
for i, (inp, target) in enumerate(Dataset.train_loader):
if args.data_augmentation:
inp = augmentation.augment_data(inp, args)
inp = inp.to(device)
target = target.to(device)
recon_target = inp
class_target = target
# this needs to be below the line where the reconstruction target is set
# sample and add noise to the input (but not to the target!).
if args.denoising_noise_value > 0.0:
noise = torch.randn(inp.size()).to(device) * args.denoising_noise_value
inp = inp + noise
if args.blur:
inp = blur_data(inp, args.patch_size, device)
# measure data loading time
data_time.update(time.time() - end)
if args.introspection:
# Update encoder
real_mu, real_std = model.module.encode(inp)
z = model.module.reparameterize(real_mu, real_std)
class_output = model.module.classifier(z)
recon = torch.sigmoid(model.module.decode(z))
model.eval()
recon_mu, recon_std = model.module.encode(recon.detach())
model.train()
z_p = torch.randn(inp.size(0), model.module.latent_dim).to(model.module.device)
recon_p = torch.sigmoid(model.module.decode(z_p))
model.eval()
mu_p, std_p = model.module.encode(recon_p.detach())
model.train()
cl, rl, kld_real, kld_rec, kld_fake = criterion_enc(class_output, class_target, recon, recon_target,
real_mu, real_std, recon_mu, recon_std, mu_p, std_p,
device, args)
kld_real_losses.update(kld_real.item(), inp.size(0))
alpha = 1
if not args.gray_scale:
alpha = 3
loss_encoder = cl + alpha * rl + args.var_beta * (kld_real + 0.5 * (kld_rec + kld_fake) * args.gamma)
optimizer_enc.zero_grad()
loss_encoder.backward()
optimizer_enc.step()
# update decoder
recon = torch.sigmoid(model.module.decode(z.detach()))
model.eval()
recon_mu, recon_std = model.module.encode(recon.detach())
model.train()
recon_p = torch.sigmoid(model.module.decode(z_p))
model.eval()
fake_mu, fake_std = model.module.encode(recon_p.detach())
model.train()
rl, kld_rec, kld_fake = criterion_dec(recon, recon_target, recon_mu, recon_std, fake_mu, fake_std, args)
loss_decoder = 0.5 * (kld_rec + kld_fake) * args.gamma + rl * alpha
optimizer_dec.zero_grad()
loss_decoder.backward()
optimizer_dec.step()
losses.update((loss_encoder + loss_decoder).item(), inp.size(0))
class_losses.update(cl.item(), inp.size(0))
recon_losses.update(rl.item(), inp.size(0))
kld_rec_losses.update(kld_rec.item(), inp.size(0))
kld_fake_losses.update(kld_fake.item(), inp.size(0))
# record precision/accuracy and losses
prec1 = accuracy(class_output, target)[0]
top1.update(prec1.item(), inp.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print progress
if i % args.print_freq == 0:
print('Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch + 1, i, len(Dataset.train_loader), batch_time=batch_time,
data_time=data_time, loss=losses, cl_loss=class_losses, top1=top1,
recon_loss=recon_losses, KLD_loss=kld_real_losses))
else:
# compute model forward
class_samples, recon_samples, mu, std = model(inp)
# if we have an autoregressive model variant, further calculate the corresponding layers.
if args.autoregression:
recon_samples_autoregression = torch.zeros(recon_samples.size(0), inp.size(0), 256, inp.size(1),
inp.size(2), inp.size(3)).to(device)
for j in range(model.module.num_samples):
recon_samples_autoregression[j] = model.module.pixelcnn(recon_target,
torch.sigmoid(recon_samples[j])).contiguous()
recon_samples = recon_samples_autoregression
# set the target to work with the 256-way Softmax
recon_target = (recon_target * 255).long()
# calculate loss
class_loss, recon_loss, kld_loss = criterion(class_samples, class_target, recon_samples, recon_target, mu, std,
device, args)
# add the individual loss components together and weight the KL term.
loss = class_loss + recon_loss + args.var_beta * kld_loss
# take mean to compute accuracy. Note if variational samples are 1 this only gets rid of a dummy dimension.
class_output = torch.mean(class_samples, dim=0)
# record precision/accuracy and losses
losses.update((class_loss + recon_loss + kld_loss).item(), inp.size(0))
class_losses.update(class_loss.item(), inp.size(0))
recon_losses.update(recon_loss.item(), inp.size(0))
kld_losses.update(kld_loss.item(), inp.size(0))
prec1 = accuracy(class_output, target)[0]
top1.update(prec1.item(), inp.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print progress
if i % args.print_freq == 0:
print('Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch+1, i, len(Dataset.train_loader), batch_time=batch_time,
data_time=data_time, loss=losses, cl_loss=class_losses, top1=top1,
recon_loss=recon_losses, KLD_loss=kld_losses))
# TensorBoard summary logging
if args.introspection:
writer.add_scalar('training/train_precision@1', top1.avg, epoch)
writer.add_scalar('training/train_average_loss', losses.avg, epoch)
writer.add_scalar('training/train_KLD_real', kld_real_losses.avg, epoch)
writer.add_scalar('training/train_class_loss', class_losses.avg, epoch)
writer.add_scalar('training/train_KLD_rec', kld_rec_losses.avg, epoch)
writer.add_scalar('training/train_KLD_fake', kld_fake_losses.avg, epoch)
else:
writer.add_scalar('training/train_precision@1', top1.avg, epoch)
writer.add_scalar('training/train_average_loss', losses.avg, epoch)
writer.add_scalar('training/train_KLD', kld_losses.avg, epoch)
writer.add_scalar('training/train_class_loss', class_losses.avg, epoch)
writer.add_scalar('training/train_recon_loss', recon_losses.avg, epoch)
print(' * Train: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}'.format(loss=losses, top1=top1))
def train(train_loader, model, criterion, epoch, optimizer, lr_scheduler,
device, batch_split_size, args):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
train_loader (torch.utils.data.DataLoader): The trainset dataloader
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
lr_scheduler (Training.LearningRateScheduler): class implementing learning rate schedules
device (str): device name where data is transferred to
batch_split_size (int): size of smaller split of batch to
calculate sequentially if too little memory is available
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int) and batch_size (int).
"""
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
top1 = AverageMeter()
top5 = AverageMeter()
# switch to train mode
model.train()
end = time.time()
factor = args.batch_size // batch_split_size
last_batch = int(
math.ceil(len(train_loader.dataset) / float(batch_split_size)))
optimizer.zero_grad()
for i, (inp, target) in enumerate(train_loader):
inp, target = inp.to(device), target.to(device)
# measure data loading time
data_time.update(time.time() - end)
# adjust the learning rate
if i % factor == 0:
lr_scheduler.adjust_learning_rate(optimizer, i // factor + 1)
# compute output
output = model(inp)
loss = criterion(output, target) * inp.size(0) / float(args.batch_size)
# measure accuracy and record loss
prec1, prec5 = accuracy(output, target, topk=(1, 5))
losses.update(loss.item() * float(args.batch_size) / inp.size(0),
inp.size(0))
top1.update(prec1.item(), inp.size(0))
top5.update(prec5.item(), inp.size(0))
# compute gradient and do SGD step
loss.backward()
if (i + 1) % factor == 0 or i == (last_batch - 1):
optimizer.step()
optimizer.zero_grad()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % (args.print_freq * factor) == 0:
print('Epoch: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Prec@5 {top5.val:.3f} ({top5.avg:.3f})'.format(
epoch + 1,
i,
len(train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
top1=top1,
top5=top5))
print(' * Train: Prec@1 {top1.avg:.3f} Prec@5 {top5.avg:.3f}'.format(
top1=top1, top5=top5))
return top1.avg
def train(Dataset, model, criterion, epoch, iteration, optimizer, writer,
device, args, save_path):
"""
Trains/updates the model for one epoch on the training dataset.
Parameters:
Dataset (torch.utils.data.Dataset): The dataset
model (torch.nn.module): Model to be trained
criterion (torch.nn.criterion): Loss function
epoch (int): Continuous epoch counter
optimizer (torch.optim.optimizer): optimizer instance like SGD or Adam
writer (tensorboard.SummaryWriter): TensorBoard writer instance
device (str): device name where data is transferred to
args (dict): Dictionary of (command line) arguments.
Needs to contain print_freq (int) and log_weights (bool).
"""
# Create instances to accumulate losses etc.
class_losses = AverageMeter()
recon_losses = AverageMeter()
kld_losses = AverageMeter()
losses = AverageMeter()
lwf_losses = AverageMeter()
si_losses = AverageMeter()
batch_time = AverageMeter()
data_time = AverageMeter()
top1 = AverageMeter()
# switch to train mode
model.train()
if args.use_si and not args.is_multiheaded:
if not model.module.temp_classifier_weights is None:
# load unconsolidated classifier weights
un_consolidate_classifier(model.module)
#print("SI: loaded unconsolidated classifier weights")
#print("requires grad check: ", model.module.classifier[-1].weight)
end = time.time()
# train
if args.is_multiheaded and args.train_incremental_upper_bound:
for trainset_index in range(len(Dataset.mh_trainsets)):
# get temporary trainset loader according to trainset_index
train_loader = torch.utils.data.DataLoader(
Dataset.mh_trainsets[trainset_index],
batch_size=args.batch_size,
shuffle=True,
num_workers=args.workers,
pin_memory=torch.cuda.is_available(),
drop_last=True)
for i, (inp, target) in enumerate(train_loader):
if args.is_multiheaded and not args.incremental_instance:
# multiheaded incremental classes: move targets to head space
target = target.clone()
for i in range(target.size(0)):
target[i] = Dataset.maps_target_head[trainset_index][
target.numpy()[i]]
# move data to device
inp = inp.to(device)
target = target.to(device)
if epoch % args.epochs == 0 and i == 0:
visualize_image_grid(inp, writer, epoch + 1,
'train_inp_snapshot', save_path)
recon_target = inp
class_target = target
# this needs to be below the line where the reconstruction target is set
# sample and add noise to the input (but not to the target!).
if args.denoising_noise_value > 0.0 and not args.no_vae:
noise = torch.randn(
inp.size()).to(device) * args.denoising_noise_value
inp = inp + noise
# measure data loading time
data_time.update(time.time() - end)
# compute model forward
class_samples, recon_samples, mu, std = model(inp)
# if we have an autoregressive model variant, further calculate the corresponding layers.
if args.autoregression:
recon_samples_autoregression = torch.zeros(
recon_samples.size(0), inp.size(0), 256, inp.size(1),
inp.size(2), inp.size(3)).to(device)
for j in range(model.module.num_samples):
recon_samples_autoregression[
j] = model.module.pixelcnn(
recon_target,
torch.sigmoid(recon_samples[j])).contiguous()
recon_samples = recon_samples_autoregression
# set the target to work with the 256-way Softmax
recon_target = (recon_target * 255).long()
# computer loss for respective head
if not args.incremental_instance:
head_start = (trainset_index) * args.num_increment_tasks
head_end = (trainset_index + 1) * args.num_increment_tasks
else:
head_start = (trainset_index) * Dataset.num_classes
head_end = (trainset_index + 1) * Dataset.num_classes
if args.is_multiheaded:
if not args.incremental_instance:
class_loss, recon_loss, kld_loss = criterion(
class_samples[:, :,
head_start:head_end], class_target,
recon_samples, recon_target, mu, std, device, args)
else:
class_loss, recon_loss, kld_loss = criterion(
class_samples[:, :,
head_start:head_end], class_target,
recon_samples, recon_target, mu, std, device, args)
else:
if not args.is_segmentation:
class_loss, recon_loss, kld_loss = criterion(
class_samples, class_target, recon_samples,
recon_target, mu, std, device, args)
else:
class_loss, recon_loss, kld_loss = criterion(
class_samples,
class_target,
recon_samples,
recon_target,
mu,
std,
device,
args,
weight=Dataset.class_pixel_weight)
# add the individual loss components together and weight the KL term.
if args.no_vae:
loss = class_loss
else:
loss = class_loss + recon_loss + args.var_beta * kld_loss
# take mean to compute accuracy. Note if variational samples are 1 this only gets rid of a dummy dimension.
if args.is_multiheaded:
if not args.incremental_instance:
output = torch.mean(class_samples[:, :,
head_start:head_end],
dim=0)
else:
output = torch.mean(class_samples[:, :,
head_start:head_end],
dim=0)
else:
output = torch.mean(class_samples, dim=0)
# record precision/accuracy and losses
prec1 = accuracy(output, target)[0]
top1.update(prec1.item(), inp.size(0))
if args.no_vae:
losses.update(class_loss.item(), inp.size(0))
class_losses.update(class_loss.item(), inp.size(0))
else:
losses.update((class_loss + recon_loss + kld_loss).item(),
inp.size(0))
class_losses.update(class_loss.item(), inp.size(0))
recon_losses.update(recon_loss.item(), inp.size(0))
kld_losses.update(kld_loss.item(), inp.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print progress
if i % args.print_freq == 0:
if args.use_lwf and model.module.prev_model:
print(
'Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'LwF Loss {lwf_loss:.4f}\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.
format(epoch,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=class_losses,
top1=top1,
recon_loss=recon_losses,
KLD_loss=kld_losses,
lwf_loss=cl_lwf.item()))
if args.use_si and model.module.si_storage.is_initialized:
print(
'Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'SI Loss {si_loss:.4f}\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.
format(epoch,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=class_losses,
top1=top1,
recon_loss=recon_losses,
KLD_loss=kld_losses,
si_loss=loss_si.item()))
else:
print(
'Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.
format(epoch,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=class_losses,
top1=top1,
recon_loss=recon_losses,
KLD_loss=kld_losses))
# increase iteration
iteration[0] += 1
else:
for i, (inp, target) in enumerate(Dataset.train_loader):
if args.is_multiheaded and not args.incremental_instance:
# multiheaded incremental classes: move targets to head space
target = target.clone()
for i in range(target.size(0)):
target[i] = Dataset.maps_target_head[-1][target.numpy()[i]]
# move data to device
inp = inp.to(device)
target = target.to(device)
#print("inp:", inp.shape)
#print("target:", target.shape)
if epoch % args.epochs == 0 and i == 0:
visualize_image_grid(inp, writer, epoch + 1,
'train_inp_snapshot', save_path)
if not args.is_segmentation:
recon_target = inp
else:
# Split target to one hot encoding
target_one_hot = to_one_hot(target.clone(),
model.module.num_classes)
# concat input and one_hot_target
recon_target = torch.cat([inp, target_one_hot], dim=1)
class_target = target
# this needs to be below the line where the reconstruction target is set
# sample and add noise to the input (but not to the target!).
if args.denoising_noise_value > 0.0 and not args.no_vae:
noise = torch.randn(
inp.size()).to(device) * args.denoising_noise_value
inp = inp + noise
# measure data loading time
data_time.update(time.time() - end)
# compute model forward
class_samples, recon_samples, mu, std = model(inp)
# if we have an autoregressive model variant, further calculate the corresponding layers.
if args.autoregression:
recon_samples_autoregression = torch.zeros(
recon_samples.size(0), inp.size(0), 256, inp.size(1),
inp.size(2), inp.size(3)).to(device)
for j in range(model.module.num_samples):
recon_samples_autoregression[j] = model.module.pixelcnn(
recon_target,
torch.sigmoid(recon_samples[j])).contiguous()
recon_samples = recon_samples_autoregression
# set the target to work with the 256-way Softmax
recon_target = (recon_target * 255).long()
if args.is_multiheaded:
if not args.incremental_instance:
class_loss, recon_loss, kld_loss = criterion(
class_samples[:, :, -args.num_increment_tasks:],
class_target, recon_samples, recon_target, mu, std,
device, args)
else:
class_loss, recon_loss, kld_loss = criterion(
class_samples[:, :,
-Dataset.num_classes:], class_target,
recon_samples, recon_target, mu, std, device, args)
else:
if not args.is_segmentation:
class_loss, recon_loss, kld_loss = criterion(
class_samples, class_target, recon_samples,
recon_target, mu, std, device, args)
else:
class_loss, recon_loss, kld_loss = criterion(
class_samples,
class_target,
recon_samples,
recon_target,
mu,
std,
device,
args,
weight=Dataset.class_pixel_weight)
# add the individual loss components together and weight the KL term.
if args.no_vae:
loss = class_loss
else:
loss = class_loss + recon_loss + args.var_beta * kld_loss
# calculate lwf loss (if there is a previous model stored)
if args.use_lwf and model.module.prev_model:
# get prediction from previous model
with torch.no_grad():
prev_pred_class_samples, _, _, _ = model.module.prev_model(
inp)
prev_cl_losses = torch.zeros(
prev_pred_class_samples.size(0)).to(device)
# loop through each sample for each input and calculate the correspond loss. Normalize the losses.
for s in range(prev_pred_class_samples.size(0)):
if args.is_multiheaded:
if not args.incremental_instance:
prev_cl_losses[s] = loss_fn_kd_multihead(
class_samples[s]
[:, :-args.num_increment_tasks],
prev_pred_class_samples[s],
task_sizes=args.num_increment_tasks)
else:
prev_cl_losses[s] = loss_fn_kd_multihead(
class_samples[s][:, :-Dataset.num_classes],
prev_pred_class_samples[s],
task_sizes=Dataset.num_classes)
else:
if not args.is_segmentation:
prev_cl_losses[s] = loss_fn_kd(
class_samples[s], prev_pred_class_samples[s]
) #/ torch.numel(target)
else:
prev_cl_losses[s] = loss_fn_kd_2d(
class_samples[s], prev_pred_class_samples[s]
) #/ torch.numel(target)
# average the loss over all samples per input
cl_lwf = torch.mean(prev_cl_losses, dim=0)
# add lwf loss to overall loss
loss += args.lmda * cl_lwf
# record lwf losses
lwf_losses.update(cl_lwf.item(), inp.size(0))
# calculate SI loss (if SI is initialized)
if args.use_si and model.module.si_storage.is_initialized:
if not args.is_segmentation:
loss_si = args.lmda * (
SI.surrogate_loss(model.module.encoder,
model.module.si_storage) +
SI.surrogate_loss(model.module.latent_mu,
model.module.si_storage_mu) +
SI.surrogate_loss(model.module.latent_std,
model.module.si_storage_std))
else:
loss_si = args.lmda * (
SI.surrogate_loss(model.module.encoder,
model.module.si_storage) +
SI.surrogate_loss(model.module.bottleneck,
model.module.si_storage_btn) +
SI.surrogate_loss(model.module.decoder,
model.module.si_storage_dec))
#print("SI_Loss:", loss_si)
loss += loss_si
si_losses.update(loss_si.item(), inp.size(0))
# take mean to compute accuracy. Note if variational samples are 1 this only gets rid of a dummy dimension.
if args.is_multiheaded:
if not args.incremental_instance:
output = torch.mean(
class_samples[:, :, -args.num_increment_tasks:], dim=0)
else:
output = torch.mean(class_samples[:, :,
-Dataset.num_classes:],
dim=0)
else:
output = torch.mean(class_samples, dim=0)
# record precision/accuracy and losses
if not args.is_segmentation:
prec1 = accuracy(output, target)[0]
top1.update(prec1.item(), inp.size(0))
else:
ious_cc = iou_class_condtitional(pred=output.clone(),
target=target.clone())
#print("iou", ious_cc)
prec1 = iou_to_accuracy(ious_cc)
#print("prec1", prec1)
top1.update(prec1.item(), inp.size(0))
if args.no_vae:
losses.update(class_loss.item(), inp.size(0))
class_losses.update(class_loss.item(), inp.size(0))
else:
losses.update((class_loss + recon_loss + kld_loss).item(),
inp.size(0))
class_losses.update(class_loss.item(), inp.size(0))
recon_losses.update(recon_loss.item(), inp.size(0))
kld_losses.update(kld_loss.item(), inp.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# SI: update running si paramters
if args.use_si:
if not args.is_segmentation:
SI.update_si_parameters(model.module.encoder,
model.module.si_storage)
SI.update_si_parameters(model.module.latent_mu,
model.module.si_storage_mu)
SI.update_si_parameters(model.module.latent_std,
model.module.si_storage_std)
else:
SI.update_si_parameters(model.module.encoder,
model.module.si_storage)
SI.update_si_parameters(model.module.bottleneck,
model.module.si_storage_btn)
SI.update_si_parameters(model.module.decoder,
model.module.si_storage_dec)
#print("SI: Updated running parameters")
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
# print progress
if i % args.print_freq == 0:
if args.use_lwf and model.module.prev_model:
print(
'Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'LwF Loss {lwf_loss:.4f}\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=class_losses,
top1=top1,
recon_loss=recon_losses,
KLD_loss=kld_losses,
lwf_loss=cl_lwf.item()))
elif args.use_si and model.module.si_storage.is_initialized:
print(
'Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'SI Loss {si_loss:.4f}\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=class_losses,
top1=top1,
recon_loss=recon_losses,
KLD_loss=kld_losses,
si_loss=loss_si.item()))
else:
print(
'Training: [{0}][{1}/{2}]\t'
'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
'Data {data_time.val:.3f} ({data_time.avg:.3f})\t'
'Loss {loss.val:.4f} ({loss.avg:.4f})\t'
'Class Loss {cl_loss.val:.4f} ({cl_loss.avg:.4f})\t'
'Prec@1 {top1.val:.3f} ({top1.avg:.3f})\t'
'Recon Loss {recon_loss.val:.4f} ({recon_loss.avg:.4f})\t'
'KL {KLD_loss.val:.4f} ({KLD_loss.avg:.4f})'.format(
epoch,
i,
len(Dataset.train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
cl_loss=class_losses,
top1=top1,
recon_loss=recon_losses,
KLD_loss=kld_losses))
# increase iteration
iteration[0] += 1
# TensorBoard summary logging
writer.add_scalar('training/train_precision@1', top1.avg, epoch)
writer.add_scalar('training/train_average_loss', losses.avg, epoch)
writer.add_scalar('training/train_KLD', kld_losses.avg, epoch)
writer.add_scalar('training/train_class_loss', class_losses.avg, epoch)
writer.add_scalar('training/train_recon_loss', recon_losses.avg, epoch)
writer.add_scalar('training/train_precision_itr@1', top1.avg, iteration[0])
writer.add_scalar('training/train_average_loss_itr', losses.avg,
iteration[0])
writer.add_scalar('training/train_KLD_itr', kld_losses.avg, iteration[0])
writer.add_scalar('training/train_class_loss_itr', class_losses.avg,
iteration[0])
writer.add_scalar('training/train_recon_loss_itr', recon_losses.avg,
iteration[0])
if args.use_lwf:
writer.add_scalar('training/train_lwf_loss', lwf_losses.avg,
iteration[0])
if args.use_si:
writer.add_scalar('training/train_si_loss', si_losses.avg,
iteration[0])
# If the log weights argument is specified also add parameter and gradient histograms to TensorBoard.
if args.log_weights:
# Histograms and distributions of network parameters
for tag, value in model.named_parameters():
tag = tag.replace('.', '/')
writer.add_histogram(tag,
value.data.cpu().numpy(),
epoch,
bins="auto")
# second check required for buffers that appear in the parameters dict but don't receive gradients
if value.requires_grad and value.grad is not None:
writer.add_histogram(tag + '/grad',
value.grad.data.cpu().numpy(),
epoch,
bins="auto")
print(' * Train: Loss {loss.avg:.5f} Prec@1 {top1.avg:.3f}'.format(
loss=losses, top1=top1))