def valid(args, epoch, loader, model, device):
if get_rank() == 0:
pbar = tqdm(loader, dynamic_ncols=True)
else:
pbar = loader
model.eval()
recon_total = 0
kl_total = 0
n_imgs = 0
for i, img in enumerate(pbar):
img = img.to(device)
out, mean, logvar = model(img, sample=False)
recon = recon_loss(out, img)
kl = kl_loss(mean, logvar)
loss_dict = {'recon': recon, 'kl': kl}
loss_reduced = reduce_loss_dict(loss_dict)
if get_rank() == 0:
batch = img.shape[0]
recon_total += loss_reduced['recon'] * batch
kl_total += loss_reduced['kl'] * batch
n_imgs += batch
recon = recon_total / n_imgs
kl = kl_total / n_imgs
pbar.set_description(
f'valid; epoch: {epoch}; recon: {recon.item():.2f}; kl: {kl.item():.2f}'
)
if i == 0:
utils.save_image(
torch.cat([img, out], 0),
f'sample_vae/{str(epoch).zfill(2)}.png',
nrow=8,
normalize=True,
range=(-1, 1),
)
if get_rank() == 0:
if wandb and args.wandb:
wandb.log(
{
'Valid/Reconstruction': recon.item(),
'Valid/KL Divergence': kl.item(),
},
step=epoch,
)
def train(args, epoch, loader, model, optimizer, scheduler, device):
if get_rank() == 0:
pbar = tqdm(loader, dynamic_ncols=True)
else:
pbar = loader
model.train()
for img in pbar:
img = img.to(device)
out, mean, logvar = model(img)
recon = recon_loss(out, img)
kl = kl_loss(mean, logvar)
loss = recon + args.beta * kl
model.zero_grad()
loss.backward()
optimizer.step()
if scheduler is not None:
scheduler.step()
loss_dict = {'recon': recon, 'kl': kl}
loss_reduced = reduce_loss_dict(loss_dict)
if get_rank() == 0:
recon = loss_reduced['recon']
kl = loss_reduced['kl']
lr = optimizer.param_groups[0]['lr']
pbar.set_description(
f'train; epoch: {epoch}; recon: {recon.item():.2f}; kl: {kl.item():.2f}; lr: {lr:.5f}'
)
if wandb and args.wandb:
wandb.log(
{
'Train/Reconstruction': recon.item(),
'Train/KL Divergence': kl.item(),
}
)
def train(
args,
loader,
encoder,
generator,
discriminator,
cooccur,
g_optim,
d_optim,
e_ema,
g_ema,
device,
):
loader = sample_data(loader)
pbar = range(args.iter)
if get_rank() == 0:
pbar = tqdm(pbar,
initial=args.start_iter,
dynamic_ncols=True,
smoothing=0.01)
d_loss_val = 0
r1_loss = torch.tensor(0.0, device=device)
g_loss_val = 0
loss_dict = {}
if args.distributed:
e_module = encoder.module
g_module = generator.module
d_module = discriminator.module
c_module = cooccur.module
else:
e_module = encoder
g_module = generator
d_module = discriminator
c_module = cooccur
accum = 0.5**(32 / (10 * 1000))
for idx in pbar:
i = idx + args.start_iter
if i > args.iter:
print("Done!")
break
real_img = next(loader)
real_img = real_img.to(device)
requires_grad(encoder, False)
requires_grad(generator, False)
requires_grad(discriminator, True)
requires_grad(cooccur, True)
real_img1, real_img2 = real_img.chunk(2, dim=0)
structure1, texture1 = encoder(real_img1)
_, texture2 = encoder(real_img2)
fake_img1 = generator(structure1, texture1)
fake_img2 = generator(structure1, texture2)
fake_pred = discriminator(torch.cat((fake_img1, fake_img2), 0))
real_pred = discriminator(real_img)
d_loss = d_logistic_loss(real_pred, fake_pred)
fake_patch = patchify_image(fake_img2, args.n_crop)
real_patch = patchify_image(real_img2, args.n_crop)
ref_patch = patchify_image(real_img2, args.ref_crop * args.n_crop)
fake_patch_pred, ref_input = cooccur(fake_patch,
ref_patch,
ref_batch=args.ref_crop)
real_patch_pred, _ = cooccur(real_patch, ref_input=ref_input)
cooccur_loss = d_logistic_loss(real_patch_pred, fake_patch_pred)
loss_dict["d"] = d_loss
loss_dict["cooccur"] = cooccur_loss
loss_dict["real_score"] = real_pred.mean()
fake_pred1, fake_pred2 = fake_pred.chunk(2, dim=0)
loss_dict["fake_score"] = fake_pred1.mean()
loss_dict["hybrid_score"] = fake_pred2.mean()
d_optim.zero_grad()
(d_loss + cooccur_loss).backward()
d_optim.step()
d_regularize = i % args.d_reg_every == 0
if d_regularize:
real_img.requires_grad = True
real_pred = discriminator(real_img)
r1_loss = d_r1_loss(real_pred, real_img)
real_patch.requires_grad = True
real_patch_pred, _ = cooccur(real_patch,
ref_patch,
ref_batch=args.ref_crop)
cooccur_r1_loss = d_r1_loss(real_patch_pred, real_patch)
d_optim.zero_grad()
r1_loss_sum = args.r1 / 2 * r1_loss * args.d_reg_every
r1_loss_sum += args.cooccur_r1 / 2 * cooccur_r1_loss * args.d_reg_every
r1_loss_sum += 0 * real_pred[0, 0] + 0 * real_patch_pred[0, 0]
r1_loss_sum.backward()
d_optim.step()
loss_dict["r1"] = r1_loss
loss_dict["cooccur_r1"] = cooccur_r1_loss
requires_grad(encoder, True)
requires_grad(generator, True)
requires_grad(discriminator, False)
requires_grad(cooccur, False)
structure1, texture1 = encoder(real_img1)
_, texture2 = encoder(real_img2)
fake_img1 = generator(structure1, texture1)
fake_img2 = generator(structure1, texture2)
recon_loss = F.l1_loss(fake_img1, real_img1)
fake_pred = discriminator(torch.cat((fake_img1, fake_img2), 0))
g_loss = g_nonsaturating_loss(fake_pred)
fake_patch = patchify_image(fake_img2, args.n_crop)
ref_patch = patchify_image(real_img2, args.ref_crop * args.n_crop)
fake_patch_pred, _ = cooccur(fake_patch,
ref_patch,
ref_batch=args.ref_crop)
g_cooccur_loss = g_nonsaturating_loss(fake_patch_pred)
loss_dict["recon"] = recon_loss
loss_dict["g"] = g_loss
loss_dict["g_cooccur"] = g_cooccur_loss
g_optim.zero_grad()
(recon_loss + g_loss + g_cooccur_loss).backward()
g_optim.step()
accumulate(e_ema, e_module, accum)
accumulate(g_ema, g_module, accum)
loss_reduced = reduce_loss_dict(loss_dict)
d_loss_val = loss_reduced["d"].mean().item()
cooccur_val = loss_reduced["cooccur"].mean().item()
recon_val = loss_reduced["recon"].mean().item()
g_loss_val = loss_reduced["g"].mean().item()
g_cooccur_val = loss_reduced["g_cooccur"].mean().item()
r1_val = loss_reduced["r1"].mean().item()
cooccur_r1_val = loss_reduced["cooccur_r1"].mean().item()
real_score_val = loss_reduced["real_score"].mean().item()
fake_score_val = loss_reduced["fake_score"].mean().item()
hybrid_score_val = loss_reduced["hybrid_score"].mean().item()
if get_rank() == 0:
pbar.set_description((
f"d: {d_loss_val:.4f}; c: {cooccur_val:.4f} g: {g_loss_val:.4f}; "
f"g_cooccur: {g_cooccur_val:.4f}; recon: {recon_val:.4f}; r1: {r1_val:.4f}; "
f"r1_cooccur: {cooccur_r1_val:.4f}"))
if wandb and args.wandb and i % 10 == 0:
wandb.log(
{
"Generator": g_loss_val,
"Discriminator": d_loss_val,
"Cooccur": cooccur_val,
"Recon": recon_val,
"Generator Cooccur": g_cooccur_val,
"R1": r1_val,
"Cooccur R1": cooccur_r1_val,
"Real Score": real_score_val,
"Fake Score": fake_score_val,
"Hybrid Score": hybrid_score_val,
},
step=i,
)
if i % 100 == 0:
with torch.no_grad():
e_ema.eval()
g_ema.eval()
structure1, texture1 = e_ema(real_img1)
_, texture2 = e_ema(real_img2)
fake_img1 = g_ema(structure1, texture1)
fake_img2 = g_ema(structure1, texture2)
sample = torch.cat((fake_img1, fake_img2), 0)
utils.save_image(
sample,
f"sample/{str(i).zfill(6)}.png",
nrow=int(sample.shape[0]**0.5),
normalize=True,
range=(-1, 1),
)
if i % 10000 == 0:
torch.save(
{
"e": e_module.state_dict(),
"g": g_module.state_dict(),
"d": d_module.state_dict(),
"cooccur": c_module.state_dict(),
"e_ema": e_ema.state_dict(),
"g_ema": g_ema.state_dict(),
"g_optim": g_optim.state_dict(),
"d_optim": d_optim.state_dict(),
"args": args,
},
f"checkpoint/{str(i).zfill(6)}.pt",
)
def train(args, loader, generator, discriminator, vae, g_optim, d_optim, g_ema,
device):
loader = sample_data(loader)
pbar = range(args.iter)
if get_rank() == 0:
pbar = tqdm(pbar,
initial=args.start_iter,
dynamic_ncols=True,
smoothing=0.01)
d_loss_val = 0
r1_loss = torch.tensor(0.0, device=device)
g_loss_val = 0
loss_dict = {}
if args.distributed:
g_module = generator.module
d_module = discriminator.module
else:
g_module = generator
d_module = discriminator
sample_z = torch.randn(8 * 8, args.latent, device=device)
for idx in pbar:
i = idx + args.start_iter
if i > args.iter:
print('Done!')
break
real_img = next(loader)
real_img = real_img.to(device)
requires_grad(generator, False)
requires_grad(discriminator, True)
with torch.no_grad():
vae_latent, _, _ = vae(real_img)
noise = make_noise(args.batch, args.latent, 1, device)
fake_img, _ = generator([torch.cat([noise, vae_latent], 1)])
fake_pred = discriminator(fake_img)
real_pred = discriminator(real_img)
d_loss = d_logistic_loss(real_pred, fake_pred)
loss_dict['d'] = d_loss
discriminator.zero_grad()
d_loss.backward()
d_optim.step()
d_regularize = i % args.d_reg_every == 0
if d_regularize:
real_img.requires_grad = True
real_pred = discriminator(real_img)
r1_loss = d_r1_loss(real_pred, real_img)
discriminator.zero_grad()
(args.r1 / 2 * r1_loss * args.d_reg_every +
0 * real_pred[0]).backward()
d_optim.step()
loss_dict['r1'] = r1_loss
requires_grad(generator, True)
requires_grad(discriminator, False)
noise = make_noise(args.batch, args.latent, 1, device)
fake_img, _ = generator([torch.cat([noise, vae_latent], 1)])
fake_pred = discriminator(fake_img)
_, mean, logvar = vae(fake_img)
vae_loss = gaussian_nll_loss(vae_latent.detach(), mean, logvar)
vae_weight = min(1, ((1 - 1e-5) / args.vae_warmup) * i + 1e-5)
vae_loss = vae_weight * vae_loss
g_loss = g_nonsaturating_loss(fake_pred)
loss_dict['g'] = g_loss
loss_dict['vae'] = vae_loss
generator.zero_grad()
(g_loss + args.vae_regularize * vae_loss).backward()
g_optim.step()
accumulate(g_ema, g_module)
loss_reduced = reduce_loss_dict(loss_dict)
d_loss_val = loss_reduced['d'].mean().item()
g_loss_val = loss_reduced['g'].mean().item()
r1_val = loss_reduced['r1'].mean().item()
vae_loss_val = loss_reduced['vae'].mean().item()
if get_rank() == 0:
pbar.set_description((
f'd: {d_loss_val:.4f}; g: {g_loss_val:.4f}; r1: {r1_val:.4f}; vae: {vae_loss_val:.4f}'
))
if wandb and args.wandb:
wandb.log({
'Generator': g_loss_val,
'Discriminator': d_loss_val,
'R1': r1_val,
'VAE': vae_loss_val,
})
if i % 100 == 0:
n_repeat = sample_z.shape[0] // vae_latent.shape[0] + 1
vae_latent = vae_latent.repeat(n_repeat, 1)
vae_latent = vae_latent[:sample_z.shape[0]]
with torch.no_grad():
g_ema.eval()
sample, _ = g_ema([torch.cat([sample_z, vae_latent], 1)])
utils.save_image(
sample,
f'sample/{str(i).zfill(6)}.png',
nrow=8,
normalize=True,
range=(-1, 1),
)
if i % 10000 == 0:
torch.save(
{
'g': g_module.state_dict(),
'd': d_module.state_dict(),
'g_ema': g_ema.state_dict(),
'g_optim': g_optim.state_dict(),
'd_optim': d_optim.state_dict(),
},
f'checkpoint/{str(i).zfill(6)}.pt',
)