def plot_col(fig, col, img_idx, device, models, edge_width, color_gt, color_model):
datamodule = util.load_datamodule_for_model(models[0], batch_size=1)
x, ys = load_sample(datamodule, idx=img_idx, device=device)
y_mean = torch.stack(ys).float().mean(dim=0).round().long()
# plot image
fig.plot_img(0, col, add_edge(x[0], width=edge_width), vmin=0, vmax=1)
# plot gt seg outline
fig.plot_contour(0, col, y_mean[0],
contour_class=1, width=2, rgba=color_gt)
# plot model predictions
for row, model in enumerate(models):
pl.seed_everything(42)
with torch.no_grad():
p = model.pixel_wise_probabaility(x, sample_cnt=16)
_, y_pred_mean = p.max(dim=1, keepdim=True)
uncertainty = util.entropy(p)
# plot uncertainty heatmap
fig.plot_overlay(
row + 1, col, add_edge(uncertainty[0], c=1, width=edge_width), alpha=1, vmin=0, vmax=1, cmap='Greys')
# plot gt seg outline
fig.plot_contour(
row + 1, col, y_mean[0], contour_class=1, width=2, rgba=color_gt)
# plot model prediction outline
fig.plot_contour(row + 1, col, y_pred_mean[0], contour_class=1, width=2, rgba=color_model
)
def pixel_wise_uncertainty(self, x, sample_cnt=16):
"""return the pixel-wise entropy
Args:
x: the input
sample_cnt (optional): Amount of samples to draw for internal approximation
Returns:
tensor: B x 1 x H x W
"""
p = self.pixel_wise_probabaility(x, sample_cnt=sample_cnt)
return util.entropy(p)
def validate(val_loader,
model,
criterion,
avu_criterion,
epoch,
tb_writer=None):
batch_time = AverageMeter()
losses = AverageMeter()
top1 = AverageMeter()
avg_unc = AverageMeter()
global opt_th
# switch to evaluate mode
model.eval()
end = time.time()
preds_list = []
labels_list = []
unc_list = []
th_list = np.linspace(0, 1, 21)
with torch.no_grad():
for i, (input, target) in enumerate(val_loader):
if torch.cuda.is_available():
target = target.cuda()
input_var = input.cuda()
target_var = target.cuda()
else:
target = target.cpu()
input_var = input.cpu()
target_var = target.cpu()
if args.half:
input_var = input_var.half()
output, kl = model(input_var)
probs_ = torch.nn.functional.softmax(output, dim=1)
probs = probs_.data.cpu().numpy()
pred_entropy = util.entropy(probs)
unc = np.mean(pred_entropy, axis=0)
preds = np.argmax(probs, axis=-1)
preds_list.append(preds)
labels_list.append(target.cpu().data.numpy())
unc_list.append(pred_entropy)
cross_entropy_loss = criterion(output, target_var)
scaled_kl = kl.data / len_trainset
elbo_loss = cross_entropy_loss + scaled_kl
avu_loss, auc_avu = avu_criterion(output, target_var, type=0)
avu_loss = beta * avu_loss
loss = cross_entropy_loss + scaled_kl + avu_loss
output = output.float()
loss = loss.float()
# measure accuracy and record loss
prec1 = accuracy(output.data, target)[0]
losses.update(loss.item(), input.size(0))
top1.update(prec1.item(), input.size(0))
avg_unc.update(unc, input.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
print('Test: [{0}/{1}]\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'
'Avg_Unc {avg_unc.val:.3f} ({avg_unc.avg:.3f})'.format(
i,
len(val_loader),
batch_time=batch_time,
loss=losses,
top1=top1,
avg_unc=avg_unc))
if tb_writer is not None:
tb_writer.add_scalar('val/cross_entropy_loss',
cross_entropy_loss.item(), epoch)
tb_writer.add_scalar('val/kl_div', scaled_kl.item(), epoch)
tb_writer.add_scalar('val/elbo_loss', elbo_loss.item(), epoch)
tb_writer.add_scalar('val/avu_loss', avu_loss, epoch)
tb_writer.add_scalar('val/loss', loss.item(), epoch)
tb_writer.add_scalar('val/AUC-AvU', auc_avu, epoch)
tb_writer.add_scalar('val/accuracy', prec1.item(), epoch)
tb_writer.flush()
preds = np.hstack(np.asarray(preds_list))
labels = np.hstack(np.asarray(labels_list))
unc_ = np.hstack(np.asarray(unc_list))
avu_th, unc_th = util.eval_avu(preds, labels, unc_)
print('max AvU: ', np.amax(avu_th))
unc_correct = np.take(unc_, np.where(preds == labels))
unc_incorrect = np.take(unc_, np.where(preds != labels))
print('avg unc correct preds: ',
np.mean(np.take(unc_, np.where(preds == labels)), axis=1))
print('avg unc incorrect preds: ',
np.mean(np.take(unc_, np.where(preds != labels)), axis=1))
'''
print('unc @max AvU: ', unc_th[np.argmax(avu_th)])
print('avg unc: ', np.mean(unc_, axis=0))
print('avg unc: ', np.mean(unc_th, axis=0))
print('min unc: ', np.amin(unc_))
print('max unc: ', np.amax(unc_))
'''
if epoch <= 5:
opt_th = (np.mean(unc_correct, axis=1) +
np.mean(unc_incorrect, axis=1)) / 2
print('opt_th: ', opt_th)
print(' * Prec@1 {top1.avg:.3f}'.format(top1=top1))
return top1.avg
def train(train_loader,
model,
criterion,
avu_criterion,
optimizer,
epoch,
tb_writer=None):
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
top1 = AverageMeter()
avg_unc = AverageMeter()
# switch to train mode
model.train()
end = time.time()
for i, (input, target) in enumerate(train_loader):
# measure data loading time
data_time.update(time.time() - end)
if torch.cuda.is_available():
target = target.cuda()
input_var = input.cuda()
else:
target = target.cpu()
input_var = input.cpu()
target_var = target
if args.half:
input_var = input_var.half()
optimizer.zero_grad()
output, kl = model(input_var)
probs_ = torch.nn.functional.softmax(output, dim=1)
probs = probs_.data.cpu().numpy()
pred_entropy = util.entropy(probs)
unc = np.mean(pred_entropy, axis=0)
preds = np.argmax(probs, axis=-1)
cross_entropy_loss = criterion(output, target_var)
scaled_kl = kl.data / len_trainset
elbo_loss = cross_entropy_loss + scaled_kl
avu_loss, auc_avu = avu_criterion(output, target_var, type=0)
avu_loss = beta * avu_loss
loss = cross_entropy_loss + scaled_kl + avu_loss
# compute gradient and do SGD step
loss.backward()
optimizer.step()
output = output.float()
loss = loss.float()
# measure accuracy and record loss
prec1 = accuracy(output.data, target)[0]
losses.update(loss.item(), input.size(0))
top1.update(prec1.item(), input.size(0))
avg_unc.update(unc, input.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
#print('opt_th: ', opt_th)
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'
'Avg_Unc {avg_unc.val:.3f} ({avg_unc.avg:.3f})'.format(
epoch,
i,
len(train_loader),
batch_time=batch_time,
data_time=data_time,
loss=losses,
top1=top1,
avg_unc=avg_unc))
if tb_writer is not None:
tb_writer.add_scalar('train/cross_entropy_loss',
cross_entropy_loss.item(), epoch)
tb_writer.add_scalar('train/kl_div', scaled_kl.item(), epoch)
tb_writer.add_scalar('train/elbo_loss', elbo_loss.item(), epoch)
tb_writer.add_scalar('train/avu_loss', avu_loss, epoch)
tb_writer.add_scalar('train/loss', loss.item(), epoch)
tb_writer.add_scalar('train/AUC-AvU', auc_avu, epoch)
tb_writer.add_scalar('train/accuracy', prec1.item(), epoch)
tb_writer.flush()
def make_fig(args):
# set up
device = 'cuda' if torch.cuda.is_available() else 'cpu'
model = util.load_model_from_checkpoint(args.model_path).to(device)
datamodule = util.load_datamodule_for_model(model, batch_size=1)
for idx in tqdm(range(100), desc='Generating Images'):
x, y = load_sample(datamodule, idx=idx, device=device)
fig = Fig(
rows=1,
cols=2,
title=None,
figsize=None,
background=True,
)
colors = np.array(sns.color_palette("Paired")) * 255
color_gt = colors[1]
color_model = colors[7]
# draw samples
pl.seed_everything(42)
with torch.no_grad():
p = model.pixel_wise_probabaility(x, sample_cnt=args.samples)
_, y_pred = p.max(dim=1, keepdim=True)
uncertainty = util.entropy(p)
# plot image
fig.plot_img(0, 0, x[0], vmin=0, vmax=1)
# plot uncertainty heatmap
fig.plot_overlay(
0, 1, uncertainty[0], alpha=1, vmin=None, vmax=None, cmap='Greys', colorbar=True, colorbar_label="Model Uncertainty")
# plot model prediction outline
fig.plot_contour(0, 0, y_pred[0], contour_class=1, width=2, rgba=color_model
)
fig.plot_contour(0, 1, y_pred[0], contour_class=1, width=2, rgba=color_model
)
# plot gt seg outline
fig.plot_contour(0, 0, y[0], contour_class=1, width=2, rgba=color_gt
)
fig.plot_contour(0, 1, y[0], contour_class=1, width=2, rgba=color_gt
)
# add legend
from matplotlib import pyplot as plt
from matplotlib.patches import Rectangle
legend_data = [
[0, color_gt, "GT Annotation"],
[1, color_model, "Model Prediction"], ]
handles = [
Rectangle((0, 0), 1, 1, color=[v/255 for v in c]) for k, c, n in legend_data
]
labels = [n for k, c, n in legend_data]
plt.legend(handles, labels, ncol=len(legend_data))
os.makedirs("./plots/", exist_ok=True)
# fig.save(args.output_file)
os.makedirs(args.output_folder, exist_ok=True)
fig.save(os.path.join(args.output_folder,
f'test_{idx}.png'), close=False)
fig.save(os.path.join(args.output_folder, f'test_{idx}.pdf'))
def train(train_loader, model, criterion, avu_criterion, optimizer, epoch,
args, tb_writer):
batch_time = AverageMeter('Time', ':6.3f')
data_time = AverageMeter('Data', ':6.3f')
losses = AverageMeter('Loss', ':.4e')
top1 = AverageMeter('Acc@1', ':6.2f')
top5 = AverageMeter('Acc@5', ':6.2f')
global opt_th
progress = ProgressMeter(len(train_loader),
[batch_time, data_time, losses, top1, top5],
prefix="Epoch: [{}]".format(epoch))
# switch to train mode
model.train()
end = time.time()
for i, (images, target) in enumerate(train_loader):
# measure data loading time
data_time.update(time.time() - end)
if torch.cuda.is_available():
images = images.cuda(non_blocking=True)
target = target.cuda(non_blocking=True)
else:
images = images.cpu(non_blocking=True)
target = target.cpu(non_blocking=True)
# compute output
output, kl = model(images)
probs_ = torch.nn.functional.softmax(output, dim=1)
probs = probs_.data.cpu().numpy()
pred_entropy = util.entropy(probs)
preds = np.argmax(probs, axis=-1)
AvU = util.accuracy_vs_uncertainty(np.array(preds),
np.array(target.cpu().data.numpy()),
np.array(pred_entropy), opt_th)
preds_list.append(preds)
labels_list.append(target.cpu().data.numpy())
unc_list.append(pred_entropy)
cross_entropy_loss = criterion(output, target)
scaled_kl = (kl.data[0] / len_trainset)
elbo_loss = cross_entropy_loss + scaled_kl
avu_loss = beta * avu_criterion(output, target, opt_th, type=0)
loss = cross_entropy_loss + scaled_kl + avu_loss
output = output.float()
loss = loss.float()
# measure accuracy and record loss
acc1, acc5 = accuracy(output, target, topk=(1, 5))
losses.update(loss.item(), images.size(0))
top1.update(acc1[0], images.size(0))
top5.update(acc5[0], images.size(0))
# compute gradient and do SGD step
optimizer.zero_grad()
loss.mean().backward()
optimizer.step()
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
progress.display(i)
if tb_writer is not None:
tb_writer.add_scalar('train/cross_entropy_loss',
cross_entropy_loss.item(), epoch)
tb_writer.add_scalar('train/kl_div', scaled_kl.item(), epoch)
tb_writer.add_scalar('train/elbo_loss', elbo_loss.item(), epoch)
tb_writer.add_scalar('train/avu_loss', avu_loss.item(), epoch)
tb_writer.add_scalar('train/loss', loss.item(), epoch)
tb_writer.add_scalar('train/AvU', AvU, epoch)
tb_writer.add_scalar('train/accuracy', acc1.item(), epoch)
tb_writer.flush()
preds = np.hstack(np.asarray(preds_list))
labels = np.hstack(np.asarray(labels_list))
unc_ = np.hstack(np.asarray(unc_list))
unc_correct = np.take(unc_, np.where(preds == labels))
unc_incorrect = np.take(unc_, np.where(preds != labels))
#print('avg unc correct preds: ', np.mean(np.take(unc_,np.where(preds == labels)), axis=1))
#print('avg unc incorrect preds: ', np.mean(np.take(unc_,np.where(preds != labels)), axis=1))
if epoch <= 1:
opt_th = (np.mean(unc_correct, axis=1) +
np.mean(unc_incorrect, axis=1)) / 2
print('opt_th: ', opt_th)
