def eval_epoch(model, data_loader, epoch, config):
metrics = {
"accuracy": Mean(),
"entropy": Mean(),
}
with torch.no_grad():
model.eval()
for images_x, targets_x in tqdm(data_loader,
desc="epoch {}/{}, eval".format(
epoch, config.epochs)):
images_x, targets_x = images_x.to(DEVICE), targets_x.to(DEVICE)
probs_x = model(images_x)
metrics["entropy"].update(entropy(probs_x).data.cpu().numpy())
metrics["accuracy"].update(
(probs_x.argmax(-1) == targets_x).float().data.cpu().numpy())
writer = SummaryWriter(os.path.join(config.experiment_path, "eval"))
with torch.no_grad():
for k in metrics:
writer.add_scalar(k,
metrics[k].compute_and_reset(),
global_step=epoch)
writer.add_image(
"images_x",
torchvision.utils.make_grid(images_x,
nrow=compute_nrow(images_x),
normalize=True),
global_step=epoch,
)
writer.flush()
writer.close()
def eval_epoch(model, data_loader, epoch, config):
metrics = {
"loss": Mean(),
"accuracy": Mean(),
}
with torch.no_grad():
model.eval()
for images, targets in tqdm(
data_loader, desc="epoch {}/{}, eval".format(epoch, config.epochs)
):
images, targets = images.to(DEVICE), targets.to(DEVICE)
logits = model(images)
loss = F.cross_entropy(input=logits, target=targets, reduction="none")
metrics["loss"].update(loss.data.cpu().numpy())
metrics["accuracy"].update((logits.argmax(-1) == targets).float().data.cpu().numpy())
writer = SummaryWriter(os.path.join(config.experiment_path, "eval"))
with torch.no_grad():
for k in metrics:
writer.add_scalar(k, metrics[k].compute_and_reset(), global_step=epoch)
writer.add_image(
"images",
torchvision.utils.make_grid(images, nrow=compute_nrow(images), normalize=True),
global_step=epoch,
)
writer.flush()
writer.close()
def train_epoch(model, data_loader, optimizer, scheduler, epoch, config):
metrics = {
"images": Last(),
"loss": Mean(),
"lr": Last(),
}
# loop over batches ################################################################################################
model.train()
for images, meta, targets in tqdm(
data_loader,
desc="fold {}, epoch {}/{}, train".format(config.fold, epoch, config.train.epochs),
):
images, meta, targets = (
images.to(DEVICE),
{k: meta[k].to(DEVICE) for k in meta},
targets.to(DEVICE),
)
# images, targets = mix_up(images, targets, alpha=1.)
logits = model(images, meta)
loss = compute_loss(input=logits, target=targets, config=config)
metrics["images"].update(images.data.cpu())
metrics["loss"].update(loss.data.cpu())
metrics["lr"].update(np.squeeze(scheduler.get_last_lr()))
optimizer.zero_grad()
loss.mean().backward()
optimizer.step()
scheduler.step()
# compute metrics ##################################################################################################
with torch.no_grad():
metrics = {k: metrics[k].compute_and_reset() for k in metrics}
writer = SummaryWriter(os.path.join(config.experiment_path, "train"))
writer.add_image(
"images",
torchvision.utils.make_grid(
metrics["images"], nrow=compute_nrow(metrics["images"]), normalize=True
),
global_step=epoch,
)
writer.add_scalar("loss", metrics["loss"], global_step=epoch)
writer.add_scalar("lr", metrics["lr"], global_step=epoch)
writer.flush()
writer.close()
def eval_epoch(model, data_loader, epoch, config):
metrics = {
"teacher/accuracy": Mean(),
"teacher/entropy": Mean(),
"student/accuracy": Mean(),
"student/entropy": Mean(),
}
with torch.no_grad():
model.eval()
for x_image, x_target in tqdm(data_loader,
desc="epoch {}/{}, eval".format(
epoch, config.epochs)):
x_image, x_target = x_image.to(DEVICE), x_target.to(DEVICE)
probs_teacher = model.teacher(x_image)
probs_student = model.student(x_image)
metrics["teacher/entropy"].update(
entropy(probs_teacher).data.cpu().numpy())
metrics["student/entropy"].update(
entropy(probs_student).data.cpu().numpy())
metrics["teacher/accuracy"].update(
(probs_teacher.argmax(-1) == x_target
).float().data.cpu().numpy())
metrics["student/accuracy"].update(
(probs_student.argmax(-1) == x_target
).float().data.cpu().numpy())
writer = SummaryWriter(os.path.join(config.experiment_path, "eval"))
with torch.no_grad():
for k in metrics:
writer.add_scalar(k,
metrics[k].compute_and_reset(),
global_step=epoch)
writer.add_image(
"x_image",
torchvision.utils.make_grid(denormalize(x_image),
nrow=compute_nrow(x_image),
normalize=True),
global_step=epoch,
)
writer.flush()
writer.close()
def train_epoch(model, data_loader, optimizer, scheduler, epoch, config):
metrics = {
"loss": Mean(),
"lr": Last(),
}
model.train()
for images, targets in tqdm(data_loader,
desc="epoch {}/{}, train".format(
epoch, config.epochs)):
images, targets = images.to(DEVICE), targets.to(DEVICE)
logits = model(images)
loss = F.cross_entropy(input=logits, target=targets, reduction="none")
metrics["loss"].update(loss.data.cpu().numpy())
metrics["lr"].update(np.squeeze(scheduler.get_lr()))
optimizer.zero_grad()
loss.mean().backward()
optimizer.step()
scheduler.step()
writer = SummaryWriter(os.path.join(config.experiment_path, "train"))
with torch.no_grad():
for k in metrics:
writer.add_scalar(k,
metrics[k].compute_and_reset(),
global_step=epoch)
writer.add_image(
"images",
torchvision.utils.make_grid(denormalize(images),
nrow=compute_nrow(images),
normalize=True),
global_step=epoch,
)
writer.add_histogram("params",
flatten_weights(model.parameters()),
global_step=epoch)
writer.flush()
writer.close()
def train_epoch(model, data_loader, optimizer, scheduler, epoch, config):
metrics = {
"loss/x": Mean(),
"loss/u": Mean(),
"weight/u": Last(),
"lr": Last(),
}
model.train()
for (images_x, targets_x), (images_u_0, images_u_1) in tqdm(
data_loader,
desc="epoch {}/{}, train".format(epoch, config.epochs)):
# prepare data #################################################################################################
images_x, targets_x, images_u_0, images_u_1 = (
images_x.to(DEVICE),
targets_x.to(DEVICE),
images_u_0.to(DEVICE),
images_u_1.to(DEVICE),
)
targets_x = one_hot(targets_x, NUM_CLASSES)
# mix-match ####################################################################################################
with torch.no_grad():
(images_x,
targets_x), (images_u,
targets_u) = mix_match(x=(images_x, targets_x),
u=(images_u_0, images_u_1),
model=model,
config=config)
probs_x, probs_u = model(torch.cat([images_x, images_u])).split(
[images_x.size(0), images_u.size(0)])
# x ############################################################################################################
loss_x = compute_loss_x(input=probs_x, target=targets_x)
metrics["loss/x"].update(loss_x.data.cpu().numpy())
# u ############################################################################################################
loss_u = compute_loss_u(input=probs_u, target=targets_u)
metrics["loss/u"].update(loss_u.data.cpu().numpy())
# opt step #####################################################################################################
metrics["lr"].update(np.squeeze(scheduler.get_last_lr()))
weight_u = config.train.mix_match.weight_u * min(
(epoch - 1) / config.epochs_warmup, 1.0)
metrics["weight/u"].update(weight_u)
optimizer.zero_grad()
(loss_x.mean() + weight_u * loss_u.mean()).backward()
optimizer.step()
scheduler.step()
if epoch % config.log_interval != 0:
return
writer = SummaryWriter(os.path.join(config.experiment_path, "train"))
with torch.no_grad():
for k in metrics:
writer.add_scalar(k,
metrics[k].compute_and_reset(),
global_step=epoch)
writer.add_image(
"images_x",
torchvision.utils.make_grid(images_x,
nrow=compute_nrow(images_x),
normalize=True),
global_step=epoch,
)
writer.add_image(
"images_u",
torchvision.utils.make_grid(images_u,
nrow=compute_nrow(images_u),
normalize=True),
global_step=epoch,
)
writer.flush()
writer.close()
def eval_epoch(model, data_loader, epoch, config):
metrics = {
"loss": Mean(),
}
with torch.no_grad():
model.eval()
for (text, text_mask), (audio, audio_mask) in tqdm(
data_loader,
desc="epoch {}/{}, eval".format(epoch, config.train.epochs)):
text, audio, text_mask, audio_mask = [
x.to(DEVICE) for x in [text, audio, text_mask, audio_mask]
]
output, pre_output, target, target_mask, weight = model(
text, text_mask, audio, audio_mask)
loss = masked_mse(output, target, target_mask) + masked_mse(
pre_output, target, target_mask)
metrics["loss"].update(loss.data.cpu())
writer = SummaryWriter(os.path.join(config.experiment_path, "eval"))
with torch.no_grad():
gl_true = griffin_lim(target, model.spectra)
gl_pred = griffin_lim(output, model.spectra)
output, pre_output, target, weight = [
x.unsqueeze(1) for x in [output, pre_output, target, weight]
]
nrow = compute_nrow(target)
for k in metrics:
writer.add_scalar(k,
metrics[k].compute_and_reset(),
global_step=epoch)
writer.add_image(
"target",
torchvision.utils.make_grid(target, nrow=nrow, normalize=True),
global_step=epoch,
)
writer.add_image(
"output",
torchvision.utils.make_grid(output, nrow=nrow, normalize=True),
global_step=epoch,
)
writer.add_image(
"pre_output",
torchvision.utils.make_grid(pre_output, nrow=nrow, normalize=True),
global_step=epoch,
)
writer.add_image(
"weight",
torchvision.utils.make_grid(weight, nrow=nrow, normalize=True),
global_step=epoch,
)
for i in tqdm(range(min(text.size(0), 4)), desc="writing audio"):
writer.add_audio("audio/{}".format(i),
audio[i],
sample_rate=config.sample_rate,
global_step=epoch)
writer.add_audio(
"griffin-lim-true/{}".format(i),
gl_true[i],
sample_rate=config.sample_rate,
global_step=epoch,
)
writer.add_audio(
"griffin-lim-pred/{}".format(i),
gl_pred[i],
sample_rate=config.sample_rate,
global_step=epoch,
)
writer.flush()
writer.close()
def eval_epoch(model, data_loader, epoch, config):
writer = SummaryWriter(os.path.join(config.experiment_path, "eval"))
metrics = {
"loss": Mean(),
"iou": IoU(),
}
with torch.no_grad():
model.eval()
for images, targets in tqdm(
data_loader, desc="epoch {}/{}, eval".format(epoch, config.epochs)
):
images, targets = images.to(DEVICE), targets.to(DEVICE)
targets = image_one_hot(targets, NUM_CLASSES)
logits = model(images)
loss = compute_loss(input=logits, target=targets)
metrics["loss"].update(loss.data.cpu().numpy())
metrics["iou"].update(input=logits.argmax(1), target=targets.argmax(1))
with torch.no_grad():
mask_true = F.interpolate(draw_masks(targets.argmax(1, keepdim=True)), scale_factor=1)
mask_pred = F.interpolate(draw_masks(logits.argmax(1, keepdim=True)), scale_factor=1)
for k in metrics:
writer.add_scalar(k, metrics[k].compute_and_reset(), global_step=epoch)
writer.add_image(
"images",
torchvision.utils.make_grid(
denormalize(images), nrow=compute_nrow(images), normalize=True
),
global_step=epoch,
)
writer.add_image(
"mask_true",
torchvision.utils.make_grid(mask_true, nrow=compute_nrow(mask_true), normalize=True),
global_step=epoch,
)
writer.add_image(
"mask_pred",
torchvision.utils.make_grid(mask_pred, nrow=compute_nrow(mask_pred), normalize=True),
global_step=epoch,
)
writer.add_image(
"images_true",
torchvision.utils.make_grid(
denormalize(images) + mask_true, nrow=compute_nrow(images), normalize=True
),
global_step=epoch,
)
writer.add_image(
"images_pred",
torchvision.utils.make_grid(
denormalize(images) + mask_pred, nrow=compute_nrow(images), normalize=True
),
global_step=epoch,
)
writer.flush()
writer.close()
def train_epoch(model, data_loader, optimizer, scheduler, epoch, config):
metrics = {
"x_loss": Mean(),
"u_loss": Mean(),
"u_loss_mask": Mean(),
"lr": Last(),
}
model.train()
for (x_w_images, x_targets), (u_w_images, u_s_images) in tqdm(
data_loader, desc="epoch {}/{}, train".format(epoch, config.epochs)
):
x_w_images, x_targets, u_w_images, u_s_images = (
x_w_images.to(DEVICE),
x_targets.to(DEVICE),
u_w_images.to(DEVICE),
u_s_images.to(DEVICE),
)
x_w_logits, u_w_logits, u_s_logits = model(
torch.cat([x_w_images, u_w_images, u_s_images], 0)
).split([x_w_images.size(0), u_w_images.size(0), u_s_images.size(0)])
# x ############################################################################################################
x_loss = F.cross_entropy(input=x_w_logits, target=x_targets, reduction="none")
metrics["x_loss"].update(x_loss.data.cpu().numpy())
# u ############################################################################################################
u_loss_mask, u_targets = F.softmax(u_w_logits.detach(), 1).max(1)
u_loss_mask = (u_loss_mask >= config.train.tau).float()
u_loss = u_loss_mask * F.cross_entropy(
input=u_s_logits, target=u_targets, reduction="none"
)
metrics["u_loss"].update(u_loss.data.cpu().numpy())
metrics["u_loss_mask"].update(u_loss_mask.data.cpu().numpy())
# opt step #####################################################################################################
metrics["lr"].update(np.squeeze(scheduler.get_lr()))
optimizer.zero_grad()
(x_loss.mean() + config.train.u_weight * u_loss.mean()).backward()
optimizer.step()
scheduler.step()
if epoch % config.log_interval != 0:
return
writer = SummaryWriter(os.path.join(config.experiment_path, "train"))
with torch.no_grad():
for k in metrics:
writer.add_scalar(k, metrics[k].compute_and_reset(), global_step=epoch)
writer.add_image(
"x_w_images",
torchvision.utils.make_grid(
denormalize(x_w_images), nrow=compute_nrow(x_w_images), normalize=True
),
global_step=epoch,
)
writer.add_image(
"u_w_images",
torchvision.utils.make_grid(
denormalize(u_w_images), nrow=compute_nrow(u_w_images), normalize=True
),
global_step=epoch,
)
writer.add_image(
"u_s_images",
torchvision.utils.make_grid(
denormalize(u_s_images), nrow=compute_nrow(u_s_images), normalize=True
),
global_step=epoch,
)
writer.flush()
writer.close()
def main(config_path, **kwargs):
config = load_config(config_path, **kwargs)
gen = Gen(
image_size=config.image_size,
base_channels=config.gen.base_channels,
max_channels=config.gen.max_channels,
z_channels=config.noise_size,
).to(DEVICE)
dsc = Dsc(
image_size=config.image_size,
base_channels=config.dsc.base_channels,
max_channels=config.dsc.max_channels,
batch_std=config.dsc.batch_std,
).to(DEVICE)
gen_ema = copy.deepcopy(gen)
ema = ModuleEMA(gen_ema, config.gen.ema)
pl_ema = torch.zeros([], device=DEVICE)
opt_gen = build_optimizer(gen.parameters(), config)
opt_dsc = build_optimizer(dsc.parameters(), config)
z_dist = ZDist(config.noise_size, DEVICE)
z_fixed = z_dist(8 ** 2, truncation=1)
if os.path.exists(os.path.join(config.experiment_path, "checkpoint.pth")):
state = torch.load(os.path.join(config.experiment_path, "checkpoint.pth"))
dsc.load_state_dict(state["dsc"])
gen.load_state_dict(state["gen"])
gen_ema.load_state_dict(state["gen_ema"])
opt_gen.load_state_dict(state["opt_gen"])
opt_dsc.load_state_dict(state["opt_dsc"])
pl_ema.copy_(state["pl_ema"])
z_fixed.copy_(state["z_fixed"])
print("restored from checkpoint")
dataset = build_dataset(config)
print("dataset size: {}".format(len(dataset)))
data_loader = torch.utils.data.DataLoader(
dataset,
batch_size=config.batch_size,
shuffle=True,
num_workers=config.num_workers,
pin_memory=True,
drop_last=True,
)
data_loader = ChunkedDataLoader(data_loader, config.batches_in_epoch)
dsc_compute_loss, gen_compute_loss = build_loss(config)
writer = SummaryWriter(config.experiment_path)
for epoch in range(1, config.num_epochs + 1):
metrics = {
"dsc/loss": Mean(),
"gen/loss": Mean(),
}
dsc_logits = Concat()
dsc_targets = Concat()
gen.train()
dsc.train()
gen_ema.train()
for batch_i, real in enumerate(
tqdm(
data_loader,
desc="{}/{}".format(epoch, config.num_epochs),
disable=config.debug,
smoothing=0.1,
),
1,
):
real = real.to(DEVICE)
# generator: train
with zero_grad_and_step(opt_gen):
if config.debug:
print("gen")
fake, _ = gen(z_dist(config.batch_size), z_dist(config.batch_size))
assert (
fake.size() == real.size()
), "fake size {} does not match real size {}".format(fake.size(), real.size())
# gen fake
logits = dsc(fake)
loss = gen_compute_loss(logits, True)
loss.mean().backward()
metrics["gen/loss"].update(loss.detach())
# generator: regularize
if batch_i % config.gen.reg_interval == 0:
with zero_grad_and_step(opt_gen):
# path length regularization
fake, w = gen(z_dist(config.batch_size), z_dist(config.batch_size))
validate_shape(w, (None, config.batch_size, config.noise_size))
pl_noise = torch.randn_like(fake) / math.sqrt(fake.size(2) * fake.size(3))
(pl_grads,) = torch.autograd.grad(
outputs=[(fake * pl_noise).sum()],
inputs=[w],
create_graph=True,
only_inputs=True,
)
pl_lengths = pl_grads.square().sum(2).mean(0).sqrt()
pl_mean = pl_ema.lerp(pl_lengths.mean(), config.gen.pl_decay)
pl_ema.copy_(pl_mean.detach())
pl_penalty = (pl_lengths - pl_mean).square()
loss_pl = pl_penalty * config.gen.pl_weight * config.gen.reg_interval
loss_pl.mean().backward()
# generator: update moving average
ema.update(gen)
# discriminator: train
with zero_grad_and_step(opt_dsc):
if config.debug:
print("dsc")
with torch.no_grad():
fake, _ = gen(z_dist(config.batch_size), z_dist(config.batch_size))
assert (
fake.size() == real.size()
), "fake size {} does not match real size {}".format(fake.size(), real.size())
# dsc real
logits = dsc(real)
loss = dsc_compute_loss(logits, True)
loss.mean().backward()
metrics["dsc/loss"].update(loss.detach())
dsc_logits.update(logits.detach())
dsc_targets.update(torch.ones_like(logits))
# dsc fake
logits = dsc(fake.detach())
loss = dsc_compute_loss(logits, False)
loss.mean().backward()
metrics["dsc/loss"].update(loss.detach())
dsc_logits.update(logits.detach())
dsc_targets.update(torch.zeros_like(logits))
# discriminator: regularize
if batch_i % config.dsc.reg_interval == 0:
with zero_grad_and_step(opt_dsc):
# R1 regularization
real = real.detach().requires_grad_(True)
logits = dsc(real)
(r1_grads,) = torch.autograd.grad(
outputs=[logits.sum()],
inputs=[real],
create_graph=True,
only_inputs=True,
)
r1_penalty = r1_grads.square().sum([1, 2, 3])
loss_r1 = r1_penalty * (config.dsc.r1_gamma * 0.5) * config.dsc.reg_interval
loss_r1.mean().backward()
# break
dsc.eval()
gen.eval()
gen_ema.eval()
with torch.no_grad(), log_duration("visualization took {:.2f} seconds"):
infer = Infer(gen)
infer_ema = Infer(gen_ema)
real = infer.postprocess(real)
fake = infer(z_fixed)
fake_ema = infer_ema(z_fixed)
fake_ema_mix, fake_ema_mix_nrow = visualize_style_mixing(
infer_ema, z_fixed[0 : 8 * 2 : 2], z_fixed[1 : 8 * 2 : 2]
)
fake_ema_noise, fake_ema_noise_nrow = stack_images(
[
fake_ema[:8],
visualize_noise(infer_ema, z_fixed[:8], 128),
]
)
dsc_logits = dsc_logits.compute_and_reset().data.cpu().numpy()
dsc_targets = dsc_targets.compute_and_reset().data.cpu().numpy()
metrics = {k: metrics[k].compute_and_reset() for k in metrics}
metrics["dsc/ap"] = precision_recall_auc(input=dsc_logits, target=dsc_targets)
for k in metrics:
writer.add_scalar(k, metrics[k], global_step=epoch)
writer.add_figure(
"dsc/pr_curve",
plot_pr_curve(input=dsc_logits, target=dsc_targets),
global_step=epoch,
)
writer.add_image(
"real",
torchvision.utils.make_grid(real, nrow=compute_nrow(real)),
global_step=epoch,
)
writer.add_image(
"fake",
torchvision.utils.make_grid(fake, nrow=compute_nrow(fake)),
global_step=epoch,
)
writer.add_image(
"fake_ema",
torchvision.utils.make_grid(fake_ema, nrow=compute_nrow(fake_ema)),
global_step=epoch,
)
writer.add_image(
"fake_ema_mix",
torchvision.utils.make_grid(fake_ema_mix, nrow=fake_ema_mix_nrow),
global_step=epoch,
)
writer.add_image(
"fake_ema_noise",
torchvision.utils.make_grid(fake_ema_noise, nrow=fake_ema_noise_nrow * 2),
global_step=epoch,
)
# break
torch.save(
{
"gen": gen.state_dict(),
"gen_ema": gen_ema.state_dict(),
"dsc": dsc.state_dict(),
"opt_gen": opt_gen.state_dict(),
"opt_dsc": opt_dsc.state_dict(),
"pl_ema": pl_ema,
"z_fixed": z_fixed,
},
os.path.join(config.experiment_path, "checkpoint.pth"),
)
# break
writer.flush()
writer.close()
def eval_epoch(model, data_loader, epoch, config, suffix=""):
metrics = {
"images": Concat(),
"targets": Concat(),
"logits": Concat(),
"loss": Concat(),
}
# loop over batches ################################################################################################
model.eval()
with torch.no_grad():
for images, meta, targets in tqdm(
data_loader,
desc="fold {}, epoch {}/{}, eval".format(config.fold, epoch, config.train.epochs),
):
images, meta, targets = (
images.to(DEVICE),
{k: meta[k].to(DEVICE) for k in meta},
targets.to(DEVICE),
)
logits = model(images, meta)
loss = compute_loss(input=logits, target=targets, config=config)
metrics["images"].update(images.data.cpu())
metrics["targets"].update(targets.data.cpu())
metrics["logits"].update(logits.data.cpu())
metrics["loss"].update(loss.data.cpu())
# compute metrics ##################################################################################################
with torch.no_grad():
metrics = {k: metrics[k].compute_and_reset() for k in metrics}
metrics.update(compute_metric(input=metrics["logits"], target=metrics["targets"]))
images_hard_pos = topk_hardest(
metrics["images"],
metrics["loss"],
metrics["targets"] > 0.5,
topk=config.eval.batch_size,
)
images_hard_neg = topk_hardest(
metrics["images"],
metrics["loss"],
metrics["targets"] <= 0.5,
topk=config.eval.batch_size,
)
roc_curve = plot_roc_curve(input=metrics["logits"], target=metrics["targets"])
metrics["loss"] = metrics["loss"].mean()
writer = SummaryWriter(os.path.join(config.experiment_path, "eval", suffix))
writer.add_image(
"images/hard/pos",
torchvision.utils.make_grid(
images_hard_pos, nrow=compute_nrow(images_hard_pos), normalize=True
),
global_step=epoch,
)
writer.add_image(
"images/hard/neg",
torchvision.utils.make_grid(
images_hard_neg, nrow=compute_nrow(images_hard_neg), normalize=True
),
global_step=epoch,
)
writer.add_scalar("loss", metrics["loss"], global_step=epoch)
writer.add_scalar("roc_auc", metrics["roc_auc"], global_step=epoch)
writer.add_figure("roc_curve", roc_curve, global_step=epoch)
writer.flush()
writer.close()
return metrics["roc_auc"]
def train_epoch(model, data_loader, opt_teacher, opt_student, sched_teacher,
sched_student, epoch, config):
metrics = {
"teacher/loss": Mean(),
"teacher/grad_norm": Mean(),
"teacher/lr": Last(),
"student/loss": Mean(),
"student/grad_norm": Mean(),
"student/lr": Last(),
}
model.train()
for (x_image, x_target), (u_image, ) in tqdm(
data_loader,
desc="epoch {}/{}, train".format(epoch, config.epochs)):
x_image, x_target, u_image = x_image.to(DEVICE), x_target.to(
DEVICE), u_image.to(DEVICE)
with higher.innerloop_ctx(model.student,
opt_student) as (h_model_student,
h_opt_student):
# student ##################################################################################################
loss_student = cross_entropy(input=h_model_student(u_image),
target=model.teacher(u_image)).mean()
metrics["student/loss"].update(loss_student.data.cpu().numpy())
metrics["student/lr"].update(
np.squeeze(sched_student.get_last_lr()))
def grad_callback(grads):
metrics["student/grad_norm"].update(
grad_norm(grads).data.cpu().numpy())
return grads
h_opt_student.step(loss_student.mean(),
grad_callback=grad_callback)
sched_student.step()
# teacher ##################################################################################################
loss_teacher = (
cross_entropy(input=model.teacher(x_image),
target=one_hot(x_target, NUM_CLASSES)).mean() +
cross_entropy(input=h_model_student(x_image),
target=one_hot(x_target, NUM_CLASSES)).mean())
metrics["teacher/loss"].update(loss_teacher.data.cpu().numpy())
metrics["teacher/lr"].update(
np.squeeze(sched_teacher.get_last_lr()))
opt_teacher.zero_grad()
loss_teacher.mean().backward()
opt_teacher.step()
metrics["teacher/grad_norm"].update(
grad_norm(
p.grad
for p in model.teacher.parameters()).data.cpu().numpy())
sched_teacher.step()
# copy student weights #####################################################################################
with torch.no_grad():
for p, p_prime in zip(model.student.parameters(),
h_model_student.parameters()):
p.copy_(p_prime)
if epoch % config.log_interval != 0:
return
writer = SummaryWriter(os.path.join(config.experiment_path, "train"))
with torch.no_grad():
for k in metrics:
writer.add_scalar(k,
metrics[k].compute_and_reset(),
global_step=epoch)
writer.add_image(
"x_image",
torchvision.utils.make_grid(denormalize(x_image),
nrow=compute_nrow(x_image),
normalize=True),
global_step=epoch,
)
writer.add_image(
"u_image",
torchvision.utils.make_grid(denormalize(u_image),
nrow=compute_nrow(u_image),
normalize=True),
global_step=epoch,
)
writer.flush()
writer.close()
def main(config_path, **kwargs):
config = load_config(config_path, **kwargs)
gen = Gen(
image_size=config.image_size,
image_channels=3,
base_channels=config.gen.base_channels,
z_channels=config.noise_size,
).to(DEVICE)
dsc = Dsc(
image_size=config.image_size,
image_channels=3,
base_channels=config.dsc.base_channels,
).to(DEVICE)
# gen_ema = gen
# gen_ema = copy.deepcopy(gen)
# ema = EMA(gen_ema, 0.99)
gen.train()
dsc.train()
# gen_ema.train()
opt_gen = build_optimizer(gen.parameters(), config)
opt_dsc = build_optimizer(dsc.parameters(), config)
transform = T.Compose([
T.Resize(config.image_size),
T.RandomCrop(config.image_size),
T.ToTensor(),
T.Normalize([0.5], [0.5]),
])
# dataset = torchvision.datasets.MNIST(
# "./data/mnist", train=True, transform=transform, download=True
# )
# dataset = torchvision.datasets.CelebA(
# "./data/celeba", split="all", transform=transform, download=True
# )
dataset = ImageFolderDataset("./data/wikiart/resized/landscape",
transform=transform)
data_loader = torch.utils.data.DataLoader(
dataset,
batch_size=config.batch_size,
shuffle=True,
num_workers=config.num_workers,
pin_memory=True,
drop_last=True,
)
noise_dist = torch.distributions.Normal(0, 1)
dsc_compute_loss, gen_compute_loss = build_loss(config)
writer = SummaryWriter("./log")
for epoch in range(1, config.num_epochs + 1):
metrics = {
"dsc/loss": Mean(),
"gen/loss": Mean(),
}
dsc_logits = Concat()
dsc_targets = Concat()
for batch_index, real in enumerate(
tqdm(data_loader,
desc="{}/{}".format(epoch, config.num_epochs),
disable=config.debug)):
real = real.to(DEVICE)
# train discriminator
with zero_grad_and_step(opt_dsc):
if config.debug:
print("dsc")
noise = noise_dist.sample(
(real.size(0), config.noise_size)).to(DEVICE)
with torch.no_grad():
fake = gen(noise)
assert (fake.size() == real.size(
)), "fake size {} does not match real size {}".format(
fake.size(), real.size())
# dsc real
logits = dsc(real)
loss = dsc_compute_loss(logits, True)
loss.mean().backward()
metrics["dsc/loss"].update(loss.detach())
dsc_logits.update(logits.detach())
dsc_targets.update(torch.ones_like(logits))
# dsc fake
logits = dsc(fake.detach())
loss = dsc_compute_loss(logits, False)
loss.mean().backward()
metrics["dsc/loss"].update(loss.detach())
dsc_logits.update(logits.detach())
dsc_targets.update(torch.zeros_like(logits))
if (batch_index + 1) % 8 != 0:
# r1
r1_gamma = 10
real = real.detach().requires_grad_(True)
logits = dsc(real)
(r1_grads, ) = torch.autograd.grad(outputs=[logits.sum()],
inputs=[real],
create_graph=True,
only_inputs=True)
r1_penalty = r1_grads.square().sum([1, 2, 3])
loss_r1 = r1_penalty * (r1_gamma / 2) * 8
loss_r1.mean().backward()
if config.dsc.weight_clip is not None:
clip_parameters(dsc, config.dsc.weight_clip)
if (batch_index + 1) % config.dsc.num_steps != 0:
continue
# train generator
with zero_grad_and_step(opt_gen):
if config.debug:
print("gen")
noise = noise_dist.sample(
(real.size(0), config.noise_size)).to(DEVICE)
fake = gen(noise)
assert (fake.size() == real.size()
), "fake size {} does not match real size {}".format(
fake.size(), real.size())
# gen fake
logits = dsc(fake)
loss = gen_compute_loss(logits, True)
loss.mean().backward()
metrics["gen/loss"].update(loss.detach())
# update moving average
# ema.update(gen)
with torch.no_grad():
real, fake = [(x[:4**2] * 0.5 + 0.5).clamp(0, 1)
for x in [real, fake]]
dsc_logits = dsc_logits.compute_and_reset().data.cpu().numpy()
dsc_targets = dsc_targets.compute_and_reset().data.cpu().numpy()
metrics = {k: metrics[k].compute_and_reset() for k in metrics}
metrics["ap"] = precision_recall_auc(input=dsc_logits,
target=dsc_targets)
for k in metrics:
writer.add_scalar(k, metrics[k], global_step=epoch)
writer.add_figure(
"dsc/pr_curve",
plot_pr_curve(input=dsc_logits, target=dsc_targets),
global_step=epoch,
)
writer.add_image(
"real",
torchvision.utils.make_grid(real, nrow=compute_nrow(real)),
global_step=epoch,
)
writer.add_image(
"fake",
torchvision.utils.make_grid(fake, nrow=compute_nrow(fake)),
global_step=epoch,
)
# writer.add_image(
# "fake_ema",
# torchvision.utils.make_grid(fake, nrow=compute_nrow(fake)),
# global_step=epoch,
# )
writer.flush()
writer.close()
