generator = Generator(latent_dim=latent_dim, output_size=img_size)
optimizer_G = getattr(optim, optimizer_name)(generator.parameters(),
lr=lr,
betas=(0.5, 0.999))
optimizer_D = getattr(optim, optimizer_name)(discriminator.parameters(),
lr=lr,
betas=(0.5, 0.999))
# lr_scheduler = lr_scheduler.StepLR(optimizer, step_size=step_size, gamma=gamma)
# if load_checkpoint:
# load_model("model_checkpoint/check_point.pkl", model, optimizer, lr_scheduler)
if mutil_gpu:
discriminator = nn.DataParallel(discriminator, device_ids, device)
generator = nn.DataParallel(generator, device_ids, device)
discriminator = discriminator.to(device=device)
generator = generator.to(device=device)
mnist = torchvision.datasets.CIFAR10(root="cifar10",
train=True,
download=True,
transform=transforms.Compose([
transforms.ToTensor(),
transforms.Normalize([0.5], [0.5])
]))
dataLoaders = {
"train":
torch.utils.data.DataLoader(mnist,
batch_size=batch_size,
shuffle=True,
num_workers=12,
class tag2pix(object):
def __init__(self, args):
if args.model == 'tag2pix':
from network import Generator
elif args.model == 'senet':
from model.GD_senet import Generator
elif args.model == 'resnext':
from model.GD_resnext import Generator
elif args.model == 'catconv':
from model.GD_cat_conv import Generator
elif args.model == 'catall':
from model.GD_cat_all import Generator
elif args.model == 'adain':
from model.GD_adain import Generator
elif args.model == 'seadain':
from model.GD_seadain import Generator
else:
raise Exception('invalid model name: {}'.format(args.model))
self.args = args
self.epoch = args.epoch
self.batch_size = args.batch_size
self.gpu_mode = not args.cpu
self.input_size = args.input_size
self.color_revert = ColorSpace2RGB(args.color_space)
self.layers = args.layers
[self.cit_weight, self.cvt_weight] = args.cit_cvt_weight
self.load_dump = (args.load is not "")
self.load_path = Path(args.load)
self.l1_lambda = args.l1_lambda
self.guide_beta = args.guide_beta
self.adv_lambda = args.adv_lambda
self.save_freq = args.save_freq
self.two_step_epoch = args.two_step_epoch
self.brightness_epoch = args.brightness_epoch
self.save_all_epoch = args.save_all_epoch
self.iv_dict, self.cv_dict, self.id_to_name = get_tag_dict(
args.tag_dump)
cvt_class_num = len(self.cv_dict.keys())
cit_class_num = len(self.iv_dict.keys())
self.class_num = cvt_class_num + cit_class_num
self.start_epoch = 1
#### load dataset
if not args.test:
self.train_data_loader, self.test_data_loader = get_dataset(args)
self.result_path = Path(args.result_dir) / time.strftime(
'%y%m%d-%H%M%S', time.localtime())
if not self.result_path.exists():
self.result_path.mkdir()
self.test_images = self.get_test_data(self.test_data_loader,
args.test_image_count)
else:
self.test_data_loader = get_dataset(args)
self.result_path = Path(args.result_dir)
##### initialize network
self.net_opt = {
'guide': not args.no_guide,
'relu': args.use_relu,
'bn': not args.no_bn,
'cit': not args.no_cit
}
if self.net_opt['cit']:
self.Pretrain_ResNeXT = se_resnext_half(
dump_path=args.pretrain_dump,
num_classes=cit_class_num,
input_channels=1)
else:
self.Pretrain_ResNeXT = nn.Sequential()
self.G = Generator(input_size=args.input_size,
layers=args.layers,
cv_class_num=cvt_class_num,
iv_class_num=cit_class_num,
net_opt=self.net_opt)
self.D = Discriminator(input_dim=3,
output_dim=1,
input_size=self.input_size,
cv_class_num=cvt_class_num,
iv_class_num=cit_class_num)
for param in self.Pretrain_ResNeXT.parameters():
param.requires_grad = False
if args.test:
for param in self.G.parameters():
param.requires_grad = False
for param in self.D.parameters():
param.requires_grad = False
self.Pretrain_ResNeXT = nn.DataParallel(self.Pretrain_ResNeXT)
self.G = nn.DataParallel(self.G)
self.D = nn.DataParallel(self.D)
self.G_optimizer = optim.Adam(self.G.parameters(),
lr=args.lrG,
betas=(args.beta1, args.beta2))
self.D_optimizer = optim.Adam(self.D.parameters(),
lr=args.lrD,
betas=(args.beta1, args.beta2))
self.BCE_loss = nn.BCELoss()
self.CE_loss = nn.CrossEntropyLoss()
self.L1Loss = nn.L1Loss()
self.device = torch.device(
"cuda:0" if torch.cuda.is_available() else "cpu")
print("gpu mode: ", self.gpu_mode)
print("device: ", self.device)
print(torch.cuda.device_count(), "GPUS!")
if self.gpu_mode:
self.Pretrain_ResNeXT.to(self.device)
self.G.to(self.device)
self.D.to(self.device)
self.BCE_loss.to(self.device)
self.CE_loss.to(self.device)
self.L1Loss.to(self.device)
def train(self):
self.train_hist = {}
self.train_hist['D_loss'] = []
self.train_hist['G_loss'] = []
self.train_hist['per_epoch_time'] = []
self.train_hist['total_time'] = []
self.y_real_, self.y_fake_ = torch.ones(self.batch_size,
1), torch.zeros(
self.batch_size, 1)
if self.gpu_mode:
self.y_real_, self.y_fake_ = self.y_real_.to(
self.device), self.y_fake_.to(self.device)
if self.load_dump:
self.load(self.load_path)
print("continue training!!!!")
else:
self.end_epoch = self.epoch
self.print_params()
self.D.train()
print('training start!!')
start_time = time.time()
for epoch in range(self.start_epoch, self.end_epoch + 1):
print("EPOCH: {}".format(epoch))
self.G.train()
epoch_start_time = time.time()
if epoch == self.brightness_epoch:
print('changing brightness ...')
self.train_data_loader.dataset.enhance_brightness(
self.input_size)
max_iter = self.train_data_loader.dataset.__len__(
) // self.batch_size
for iter, (original_, sketch_, iv_tag_, cv_tag_) in enumerate(
tqdm(self.train_data_loader, ncols=80)):
if iter >= max_iter:
break
if self.gpu_mode:
sketch_, original_, iv_tag_, cv_tag_ = sketch_.to(
self.device), original_.to(self.device), iv_tag_.to(
self.device), cv_tag_.to(self.device)
# update D network
self.D_optimizer.zero_grad()
with torch.no_grad():
feature_tensor = self.Pretrain_ResNeXT(sketch_)
if self.gpu_mode:
feature_tensor = feature_tensor.to(self.device)
D_real, CIT_real, CVT_real = self.D(original_)
D_real_loss = self.BCE_loss(D_real, self.y_real_)
G_f, _ = self.G(sketch_, feature_tensor, cv_tag_)
if self.gpu_mode:
G_f = G_f.to(self.device)
D_f_fake, CIT_f_fake, CVT_f_fake = self.D(G_f)
D_f_fake_loss = self.BCE_loss(D_f_fake, self.y_fake_)
if self.two_step_epoch == 0 or epoch >= self.two_step_epoch:
CIT_real_loss = self.BCE_loss(
CIT_real, iv_tag_) if self.net_opt['cit'] else 0
CVT_real_loss = self.BCE_loss(CVT_real, cv_tag_)
C_real_loss = self.cvt_weight * CVT_real_loss + self.cit_weight * CIT_real_loss
CIT_f_fake_loss = self.BCE_loss(
CIT_f_fake, iv_tag_) if self.net_opt['cit'] else 0
CVT_f_fake_loss = self.BCE_loss(CVT_f_fake, cv_tag_)
C_f_fake_loss = self.cvt_weight * CVT_f_fake_loss + self.cit_weight * CIT_f_fake_loss
else:
C_real_loss = 0
C_f_fake_loss = 0
D_loss = self.adv_lambda * (D_real_loss + D_f_fake_loss) + (
C_real_loss + C_f_fake_loss)
self.train_hist['D_loss'].append(D_loss.item())
D_loss.backward()
self.D_optimizer.step()
# update G network
self.G_optimizer.zero_grad()
G_f, G_g = self.G(sketch_, feature_tensor, cv_tag_)
if self.gpu_mode:
G_f, G_g = G_f.to(self.device), G_g.to(self.device)
D_f_fake, CIT_f_fake, CVT_f_fake = self.D(G_f)
D_f_fake_loss = self.BCE_loss(D_f_fake, self.y_real_)
if self.two_step_epoch == 0 or epoch >= self.two_step_epoch:
CIT_f_fake_loss = self.BCE_loss(
CIT_f_fake, iv_tag_) if self.net_opt['cit'] else 0
CVT_f_fake_loss = self.BCE_loss(CVT_f_fake, cv_tag_)
C_f_fake_loss = self.cvt_weight * CVT_f_fake_loss + self.cit_weight * CIT_f_fake_loss
else:
C_f_fake_loss = 0
L1_D_f_fake_loss = self.L1Loss(G_f, original_)
L1_D_g_fake_loss = self.L1Loss(
G_g, original_) if self.net_opt['guide'] else 0
G_loss = (D_f_fake_loss + C_f_fake_loss) + \
(L1_D_f_fake_loss + L1_D_g_fake_loss * self.guide_beta) * self.l1_lambda
self.train_hist['G_loss'].append(G_loss.item())
G_loss.backward()
self.G_optimizer.step()
if ((iter + 1) % 100) == 0:
print(
"Epoch: [{:2d}] [{:4d}/{:4d}] D_loss: {:.8f}, G_loss: {:.8f}"
.format(epoch, (iter + 1), max_iter, D_loss.item(),
G_loss.item()))
self.train_hist['per_epoch_time'].append(time.time() -
epoch_start_time)
with torch.no_grad():
self.visualize_results(epoch)
utils.loss_plot(self.train_hist, self.result_path, epoch)
if epoch >= self.save_all_epoch > 0:
self.save(epoch)
elif self.save_freq > 0 and epoch % self.save_freq == 0:
self.save(epoch)
print("Training finish!... save training results")
if self.save_freq == 0 or epoch % self.save_freq != 0:
if self.save_all_epoch <= 0 or epoch < self.save_all_epoch:
self.save(epoch)
self.train_hist['total_time'].append(time.time() - start_time)
print(
"Avg one epoch time: {:.2f}, total {} epochs time: {:.2f}".format(
np.mean(self.train_hist['per_epoch_time']), self.epoch,
self.train_hist['total_time'][0]))
def test(self):
self.load_test(self.args.load)
self.D.eval()
self.G.eval()
load_path = self.load_path
result_path = self.result_path / load_path.stem
if not result_path.exists():
result_path.mkdir()
with torch.no_grad():
for sketch_, index_, _, cv_tag_ in tqdm(self.test_data_loader,
ncols=80):
if self.gpu_mode:
sketch_, cv_tag_ = sketch_.to(self.device), cv_tag_.to(
self.device)
with torch.no_grad():
feature_tensor = self.Pretrain_ResNeXT(sketch_)
if self.gpu_mode:
feature_tensor = feature_tensor.to(self.device)
# D_real, CIT_real, CVT_real = self.D(original_)
G_f, _ = self.G(sketch_, feature_tensor, cv_tag_)
G_f = self.color_revert(G_f.cpu())
for ind, result in zip(index_.cpu().numpy(), G_f):
save_path = result_path / f'{ind}.png'
if save_path.exists():
for i in range(100):
save_path = result_path / f'{ind}_{i}.png'
if not save_path.exists():
break
img = Image.fromarray(result)
img.save(save_path)
def visualize_results(self, epoch, fix=True):
if not self.result_path.exists():
self.result_path.mkdir()
self.G.eval()
# test_data_loader
original_, sketch_, iv_tag_, cv_tag_ = self.test_images
image_frame_dim = int(np.ceil(np.sqrt(len(original_))))
# iv_tag_ to feature tensor 16 * 16 * 256 by pre-reained Sketch.
with torch.no_grad():
feature_tensor = self.Pretrain_ResNeXT(sketch_)
if self.gpu_mode:
original_, sketch_, iv_tag_, cv_tag_, feature_tensor = original_.to(
self.device), sketch_.to(self.device), iv_tag_.to(
self.device), cv_tag_.to(
self.device), feature_tensor.to(self.device)
G_f, G_g = self.G(sketch_, feature_tensor, cv_tag_)
if self.gpu_mode:
G_f = G_f.cpu()
G_g = G_g.cpu()
G_f = self.color_revert(G_f)
G_g = self.color_revert(G_g)
utils.save_images(
G_f[:image_frame_dim * image_frame_dim, :, :, :],
[image_frame_dim, image_frame_dim],
self.result_path / 'tag2pix_epoch{:03d}_G_f.png'.format(epoch))
utils.save_images(
G_g[:image_frame_dim * image_frame_dim, :, :, :],
[image_frame_dim, image_frame_dim],
self.result_path / 'tag2pix_epoch{:03d}_G_g.png'.format(epoch))
def save(self, save_epoch):
if not self.result_path.exists():
self.result_path.mkdir()
with (self.result_path / 'arguments.txt').open('w') as f:
f.write(pprint.pformat(self.args.__dict__))
save_dir = self.result_path
torch.save(
{
'G': self.G.state_dict(),
'D': self.D.state_dict(),
'G_optimizer': self.G_optimizer.state_dict(),
'D_optimizer': self.D_optimizer.state_dict(),
'finish_epoch': save_epoch,
'result_path': str(save_dir)
}, str(save_dir / 'tag2pix_{}_epoch.pkl'.format(save_epoch)))
with (save_dir /
'tag2pix_{}_history.pkl'.format(save_epoch)).open('wb') as f:
pickle.dump(self.train_hist, f)
print("============= save success =============")
print("epoch from {} to {}".format(self.start_epoch, save_epoch))
print("save result path is {}".format(str(self.result_path)))
def load_test(self, checkpoint_path):
checkpoint = torch.load(str(checkpoint_path))
self.G.load_state_dict(checkpoint['G'])
def load(self, checkpoint_path):
checkpoint = torch.load(str(checkpoint_path))
self.G.load_state_dict(checkpoint['G'])
self.D.load_state_dict(checkpoint['D'])
self.G_optimizer.load_state_dict(checkpoint['G_optimizer'])
self.D_optimizer.load_state_dict(checkpoint['D_optimizer'])
self.start_epoch = checkpoint['finish_epoch'] + 1
self.finish_epoch = self.args.epoch + self.start_epoch - 1
print("============= load success =============")
print("epoch start from {} to {}".format(self.start_epoch,
self.finish_epoch))
print("previous result path is {}".format(checkpoint['result_path']))
def get_test_data(self, test_data_loader, count):
test_count = 0
original_, sketch_, iv_tag_, cv_tag_ = [], [], [], []
for orig, sket, ivt, cvt in test_data_loader:
original_.append(orig)
sketch_.append(sket)
iv_tag_.append(ivt)
cv_tag_.append(cvt)
test_count += len(orig)
if test_count >= count:
break
original_ = torch.cat(original_, 0)
sketch_ = torch.cat(sketch_, 0)
iv_tag_ = torch.cat(iv_tag_, 0)
cv_tag_ = torch.cat(cv_tag_, 0)
self.save_tag_tensor_name(iv_tag_, cv_tag_,
self.result_path / "test_image_tags.txt")
image_frame_dim = int(np.ceil(np.sqrt(len(original_))))
if self.gpu_mode:
original_ = original_.cpu()
sketch_np = sketch_.data.numpy().transpose(0, 2, 3, 1)
original_np = self.color_revert(original_)
utils.save_images(
original_np[:image_frame_dim * image_frame_dim, :, :, :],
[image_frame_dim, image_frame_dim],
self.result_path / 'tag2pix_original.png')
utils.save_images(
sketch_np[:image_frame_dim * image_frame_dim, :, :, :],
[image_frame_dim, image_frame_dim],
self.result_path / 'tag2pix_sketch.png')
return original_, sketch_, iv_tag_, cv_tag_
def save_tag_tensor_name(self, iv_tensor, cv_tensor, save_file_path):
'''iv_tensor, cv_tensor: batched one-hot tag tensors'''
iv_dict_inverse = {
tag_index: tag_id
for (tag_id, tag_index) in self.iv_dict.items()
}
cv_dict_inverse = {
tag_index: tag_id
for (tag_id, tag_index) in self.cv_dict.items()
}
with open(save_file_path, 'w') as f:
f.write("CIT tags\n")
for tensor_i, batch_unit in enumerate(iv_tensor):
tag_list = []
f.write(f'{tensor_i} : ')
for i, is_tag in enumerate(batch_unit):
if is_tag:
tag_name = self.id_to_name[iv_dict_inverse[i]]
tag_list.append(tag_name)
f.write(f"{tag_name}, ")
f.write("\n")
f.write("\nCVT tags\n")
for tensor_i, batch_unit in enumerate(cv_tensor):
tag_list = []
f.write(f'{tensor_i} : ')
for i, is_tag in enumerate(batch_unit):
if is_tag:
tag_name = self.id_to_name[cv_dict_inverse[i]]
tag_list.append(self.id_to_name[cv_dict_inverse[i]])
f.write(f"{tag_name}, ")
f.write("\n")
def print_params(self):
params_cnt = [0, 0, 0]
for param in self.G.parameters():
params_cnt[0] += param.numel()
for param in self.D.parameters():
params_cnt[1] += param.numel()
for param in self.Pretrain_ResNeXT.parameters():
params_cnt[2] += param.numel()
print(
f'Parameter #: G - {params_cnt[0]} / D - {params_cnt[1]} / Pretrain - {params_cnt[2]}'
)
class GAN:
def __init__(self):
self.generator = Generator()
self.generator.to(Params.Device)
self.discriminator = Discriminator()
self.discriminator.to(Params.Device)
self.loss_fn = nn.BCELoss()
self.optimizer_g = torch.optim.Adam(self.generator.parameters(), Params.LearningRateG, betas=(Params.Beta, 0.999))
self.optimizer_d = torch.optim.Adam(self.discriminator.parameters(), Params.LearningRateD, betas=(Params.Beta, 0.999))
self.exemplar_latent_vectors = torch.randn( (64, Params.LatentVectorSize), device=Params.Device )
def load_image_set(self):
transforms = torchvision.transforms.Compose( [
torchvision.transforms.Resize(Params.ImageSize),
torchvision.transforms.CenterCrop(Params.ImageSize),
torchvision.transforms.ToTensor(),
torchvision.transforms.Normalize( (0.5,0.5,0.5), (0.5,0.5,0.5) )
] )
self.dataset = torchvision.datasets.ImageFolder(
Params.ImagePath,
transforms
)
self.loader = torch.utils.data.DataLoader(
self.dataset,
batch_size = Params.BatchSize,
shuffle=True,
num_workers=Params.NumWorkers
)
def train(self, start_epoch=0):
self.generator.train()
self.discriminator.train()
criterion = nn.BCELoss()
self.loss_record = {
'D': [],
'G': []
}
for cur_epoch in range(start_epoch, Params.NumEpochs):
tic = time.perf_counter()
self.train_epoch(cur_epoch)
toc = time.perf_counter()
print( f"Last epoch took: {toc - tic:.0f} seconds" )
if cur_epoch % Params.CheckpointEvery == 0:
self.save_checkpoint(f"epoch{cur_epoch+1:03d}")
self.save_checkpoint(f"Final ({Params.NumEpochs} epochs)")
def train_epoch(self, cur_epoch):
for (i, real_images) in enumerate(self.loader):
# Discriminator training step
self.discriminator.zero_grad()
real_images = real_images[0].to(Params.Device)
batch_size = real_images.size(0)
labels = torch.full(
(batch_size,),
1,
dtype=torch.float, device=Params.Device
)
D_real = self.discriminator(real_images).view(-1)
D_loss_real = self.loss_fn(D_real, labels)
D_loss_real.backward()
latent_vectors = torch.randn( (batch_size, Params.LatentVectorSize), device=Params.Device )
fake_images = self.generator(latent_vectors)
D_fake = self.discriminator(fake_images.detach()).view(-1)
labels.fill_(0)
D_loss_fake = self.loss_fn(D_fake, labels)
D_loss_fake.backward()
self.optimizer_d.step()
# Generator training step
self.generator.zero_grad()
labels.fill_(1)
D_fake = self.discriminator(fake_images).view(-1)
G_loss = self.loss_fn(D_fake, labels)
G_loss.backward()
self.optimizer_g.step()
D_loss = D_loss_real.item() + D_loss_fake.item()
G_loss = G_loss.item()
if (i % Params.ReportEvery == 0) and i>0:
print( f"Epoch[{cur_epoch}/{Params.NumEpochs}] Batch[{i}/{len(self.loader)}]" )
print( f"\tD Loss: {D_loss}\tG Loss: {G_loss}\n" )
self.loss_record['D'].append(D_loss)
self.loss_record['G'].append(G_loss)
def save_checkpoint(self, checkpoint_name):
dir_path = os.path.join(Params.CheckpointPath, checkpoint_name)
os.makedirs(dir_path, exist_ok=True)
print( f"Saving snapshot to: {dir_path}" )
save_state = dict()
save_state['g_state'] = self.generator.state_dict()
save_state['g_optimizer_state'] = self.optimizer_g.state_dict()
save_state['d_state'] = self.discriminator.state_dict()
save_state['d_optimizer_state'] = self.optimizer_d.state_dict()
torch.save(
save_state,
os.path.join(dir_path, 'model_params.pt')
)
with torch.no_grad():
self.generator.eval()
gen_images = self.generator(self.exemplar_latent_vectors)
self.generator.train()
torchvision.utils.save_image(
gen_images,
os.path.join(dir_path, 'gen_images.png'),
nrow = 8,
normalize=True
)