class Trainer(object):
def __init__(self, style_data_loader, content_data_loader, config):
self.log_file = os.path.join(config.log_path, config.version,config.version+"_log.log")
self.report_file = os.path.join(config.log_path, config.version,config.version+"_report.log")
logging.basicConfig(filename=self.report_file,
format='[%(asctime)s-%(levelname)s:%(message)s]',
level = logging.DEBUG,filemode='w',
datefmt='%Y-%m-%d%I:%M:%S %p')
self.Experiment_description = config.experiment_description
logging.info("Experiment description: \n%s"%self.Experiment_description)
# Data loader
self.style_data_loader = style_data_loader
self.content_data_loader = content_data_loader
# exact loss
self.adv_loss = config.adv_loss
logging.info("loss: %s"%self.adv_loss)
# Model hyper-parameters
self.imsize = config.imsize
logging.info("image size: %d"%self.imsize)
self.batch_size = config.batch_size
logging.info("Batch size: %d"%self.batch_size)
logging.info("Is shuffle: {}".format(config.is_shuffle))
logging.info("Image center crop size: {}".format(config.center_crop))
self.res_num = config.res_num
logging.info("resblock number: %d"%self.res_num)
self.g_conv_dim = config.g_conv_dim
logging.info("generator convolution initial channel: %d"%self.g_conv_dim)
self.d_conv_dim = config.d_conv_dim
logging.info("discriminator convolution initial channel: %d"%self.d_conv_dim)
self.parallel = config.parallel
logging.info("Is multi-GPU parallel: %s"%str(self.parallel))
self.gpus = config.gpus
logging.info("GPU number: %s"%self.gpus)
self.total_step = config.total_step
logging.info("Total step: %d"%self.total_step)
self.d_iters = config.d_iters
self.g_iters = config.g_iters
self.total_iters_ratio=config.total_iters_ratio
self.num_workers = config.num_workers
self.g_lr = config.g_lr
logging.info("Generator learning rate: %f"%self.g_lr)
self.d_lr = config.d_lr
logging.info("Discriminator learning rate: %f"%self.d_lr)
self.lr_decay = config.lr_decay
logging.info("Learning rate decay: %f"%self.lr_decay)
self.beta1 = config.beta1
logging.info("Adam opitimizer beta1: %f"%self.beta1)
self.beta2 = config.beta2
logging.info("Adam opitimizer beta2: %f"%self.beta2)
self.pretrained_model = config.pretrained_model
self.use_pretrained_model = config.use_pretrained_model
logging.info("Use pretrained model: %s"%str(self.pretrained_model))
self.use_tensorboard = config.use_tensorboard
logging.info("Use tensorboard: %s"%str(self.use_tensorboard))
self.check_point_path = config.check_point_path
self.sample_path = config.sample_path
self.summary_path = config.summary_path
self.validation_path = config.validation
# val_dataloader = Validation_Data_Loader(self.validation_path,self.imsize)
# self.validation_data = val_dataloader.load_validation_images()
# valres_path = os.path.join(config.log_path, config.version, "valres")
# if not os.path.exists(valres_path):
# os.makedirs(valres_path)
# self.valres_path = valres_path
self.log_step = config.log_step
self.sample_step = config.sample_step
self.model_save_step = config.model_save_step
self.prep_weights = [1.0, 1.0, 1.0, 1.0, 1.0]
self.transform_loss_w = config.transform_loss_w
logging.info("transform loss weight: %f"%self.transform_loss_w)
self.feature_loss_w = config.feature_loss_w
logging.info("feature loss weight: %f"%self.feature_loss_w)
self.style_class = config.style_class
self.real_prep_threshold= config.real_prep_threshold
logging.info("real label threshold: %f"%self.real_prep_threshold)
# self.TVLossWeight = config.TV_loss_weight
# logging.info("TV loss weight: %f"%self.TVLossWeight)
self.discr_success_rate = config.discr_success_rate
logging.info("discriminator success rate: %f"%self.discr_success_rate)
logging.info("Is conditional generating: %s"%str(config.condition_model))
self.device = torch.device('cuda:%s'%config.default_GPU if torch.cuda.is_available() else 'cpu')
print('build_model...')
self.build_model()
if self.use_tensorboard:
self.build_tensorboard()
# Start with trained model
if self.use_pretrained_model:
print('load_pretrained_model...')
def train(self):
# Data iterator
style_iter = iter(self.style_data_loader)
content_iter = iter(self.content_data_loader)
step_per_epoch = len(self.style_data_loader)
model_save_step = int(self.model_save_step)
# Fixed input for debugging
# Start with trained model
if self.use_pretrained_model:
start = self.pretrained_model + 1
else:
start = 0
alternately_iter = 0
self.d_iters = self.d_iters * self.total_iters_ratio
max_alternately_iter = self.d_iters + self.total_iters_ratio * self.g_iters
d_acc = 0
real_acc = 0
photo_acc = 0
fake_acc = 0
win_rate = self.discr_success_rate
discr_success = self.discr_success_rate
alpha = 0.05
real_labels = []
fake_labels = []
# size = [[self.batch_size,122*122],[self.batch_size,58*58],[self.batch_size,10*10],[self.batch_size,2*2],[self.batch_size,2*2]]
size = [[self.batch_size,1,760,760],[self.batch_size,1,371,371],[self.batch_size,1,83,83],[self.batch_size,1,11,11],[self.batch_size,1,6,6]]
for i in range(5):
real_label = torch.ones(size[i], device=self.device)
fake_label = torch.zeros(size[i], device=self.device)
# threshold = torch.zeros(size[i], device=self.device)
real_labels.append(real_label)
fake_labels.append(fake_label)
# Start time
print('Start ====== training...')
start_time = time.time()
for step in range(start, self.total_step):
self.Discriminator.train()
self.Generator.train()
# self.Decoder.train()
try:
content_images =next(content_iter)
style_images = next(style_iter)
except:
style_iter = iter(self.style_data_loader)
content_iter = iter(self.content_data_loader)
style_images = next(style_iter)
content_images = next(content_iter)
style_images = style_images.to(self.device)
content_images = content_images.to(self.device)
# ================== Train D ================== #
# Compute loss with real images
if discr_success < win_rate:
real_out = self.Discriminator(style_images)
d_loss_real = 0
real_acc = 0
for i in range(len(real_out)):
temp = self.C_loss(real_out[i],real_labels[i]).mean()
real_acc += torch.gt(real_out[i],0).type(torch.float).mean()
temp *= self.prep_weights[i]
d_loss_real += temp
real_acc /= len(real_out)
d_loss_photo = 0
photo_out = self.Discriminator(content_images)
photo_acc = 0
for i in range(len(photo_out)):
temp = self.C_loss(photo_out[i],fake_labels[i])
photo_acc += torch.lt(photo_out[i],0).type(torch.float).mean()
temp *= self.prep_weights[i]
d_loss_photo += temp
photo_acc /= len(photo_out)
fake_image,_ = self.Generator(content_images)
fake_out = self.Discriminator(fake_image.detach())
d_loss_fake = 0
fake_acc = 0
for i in range(len(fake_out)):
temp = self.C_loss(fake_out[i],fake_labels[i]).mean()
fake_acc += torch.lt(fake_out[i],0).type(torch.float).mean()
temp *= self.prep_weights[i]
d_loss_fake += temp
fake_acc /= len(fake_out)
d_acc = ((real_acc + photo_acc + fake_acc)/3).item()
discr_success = discr_success * (1. - alpha) + alpha * d_acc
# Backward + Optimize
d_loss = d_loss_real + d_loss_photo + d_loss_fake
self.reset_grad()
d_loss.backward()
self.d_optimizer.step()
else:
# ================== Train G ================== #
#
fake_image, real_feature= self.Generator(content_images)
fake_feature = self.Generator(fake_image, get_feature = True)
fake_out = self.Discriminator(fake_image)
g_feature_loss = self.L1_loss(fake_feature,real_feature)
g_transform_loss = self.MSE_loss(self.Transform(content_images),self.Transform(fake_image))
g_loss_fake = 0
g_acc = 0
for i in range(len(fake_out)):
temp = self.C_loss(fake_out[i],real_labels[i]).mean()
g_acc += torch.gt(fake_out[i],0).type(torch.float).mean()
temp *= self.prep_weights[i]
g_loss_fake += temp
g_acc /= len(fake_out)
g_loss_fake = g_loss_fake + g_feature_loss*self.feature_loss_w + \
g_transform_loss*self.transform_loss_w
discr_success = discr_success * (1. - alpha) + alpha * (1.0 - g_acc)
self.reset_grad()
g_loss_fake.backward()
self.g_optimizer.step()
# self.decoder_optimizer.step()
# Print out log info
if (step + 1) % self.log_step == 0:
elapsed = time.time() - start_time
elapsed = str(datetime.timedelta(seconds=elapsed))
print("Elapsed [{}], G_step [{}/{}], D_step[{}/{}], d_out_real: {:.4f}, d_out_fake: {:.4f}, g_loss_fake: {:.4f}".
format(elapsed, step + 1, self.total_step, (step + 1),
self.total_step , d_loss_real.item(), d_loss_fake.item(), g_loss_fake.item()))
if self.use_tensorboard:
self.writer.add_scalar('data/d_loss_real', d_loss_real.item(),(step + 1))
self.writer.add_scalar('data/d_loss_fake', d_loss_fake.item(),(step + 1))
self.writer.add_scalar('data/d_loss', d_loss.item(), (step + 1))
self.writer.add_scalar('data/g_loss', g_loss_fake.item(), (step + 1))
self.writer.add_scalar('data/g_feature_loss', g_feature_loss, (step + 1))
self.writer.add_scalar('data/g_transform_loss', g_transform_loss, (step + 1))
# self.writer.add_scalar('data/g_tv_loss', g_tv_loss, (step + 1))
self.writer.add_scalar('acc/real_acc', real_acc.item(), (step + 1))
self.writer.add_scalar('acc/photo_acc', photo_acc.item(), (step + 1))
self.writer.add_scalar('acc/fake_acc', fake_acc.item(), (step + 1))
self.writer.add_scalar('acc/disc_acc', d_acc, (step + 1))
self.writer.add_scalar('acc/g_acc', g_acc, (step + 1))
self.writer.add_scalar("acc/discr_success",discr_success,(step+1))
# Sample images
if (step + 1) % self.sample_step == 0:
print('Sample images {}_fake.png'.format(step + 1))
fake_images,_ = self.Generator(content_images)
saved_image1 = torch.cat([denorm(content_images),denorm(fake_images.data)],3)
saved_image2 = torch.cat([denorm(style_images),denorm(fake_images.data)],3)
wocao = torch.cat([saved_image1,saved_image2],2)
save_image(wocao,
os.path.join(self.sample_path, '{}_fake.jpg'.format(step + 1)))
# print("Transfer validation images")
# num = 1
# for val_img in self.validation_data:
# print("testing no.%d img"%num)
# val_img = val_img.to(self.device)
# fake_images,_ = self.Generator(val_img)
# saved_val_image = torch.cat([denorm(val_img),denorm(fake_images)],3)
# save_image(saved_val_image,
# os.path.join(self.valres_path, '%d_%d.jpg'%((step+1),num)))
# num +=1
# save_image(denorm(displaymask.data),os.path.join(self.sample_path, '{}_mask.png'.format(step + 1)))
if (step+1) % model_save_step==0:
torch.save(self.Generator.state_dict(),
os.path.join(self.check_point_path , '{}_Generator.pth'.format(step + 1)))
torch.save(self.Discriminator.state_dict(),
os.path.join(self.check_point_path , '{}_Discriminator.pth'.format(step + 1)))
# alternately_iter += 1
# alternately_iter %= max_alternately_iter
def build_model(self):
# code_dim=100, n_class=1000
self.Generator = Generator(chn=self.g_conv_dim, k_size= 3, res_num= self.res_num).to(self.device)
self.Discriminator = Discriminator(chn=self.d_conv_dim, k_size= 3).to(self.device)
self.Transform = Transform_block().to(self.device)
if self.parallel:
print('use parallel...')
print('gpuids ', self.gpus)
gpus = [int(i) for i in self.gpus.split(',')]
self.Generator = nn.DataParallel(self.Generator, device_ids=gpus)
self.Discriminator = nn.DataParallel(self.Discriminator, device_ids=gpus)
self.Transform = nn.DataParallel(self.Transform, device_ids=gpus)
# self.G.apply(weights_init)
# self.D.apply(weights_init)
# Loss and optimizer
# self.g_optimizer = torch.optim.Adam(self.G.parameters(), self.g_lr, [self.beta1, self.beta2])
self.g_optimizer = torch.optim.Adam(filter(lambda p: p.requires_grad,
self.Generator.parameters()), self.g_lr, [self.beta1, self.beta2])
# self.decoder_optimizer = torch.optim.Adam(filter(lambda p: p.requires_grad,
# self.Decoder.parameters()), self.g_lr, [self.beta1, self.beta2])
self.d_optimizer = torch.optim.Adam(filter(lambda p: p.requires_grad,
self.Discriminator.parameters()), self.d_lr, [self.beta1, self.beta2])
# self.L1_loss = torch.nn.L1Loss()
self.MSE_loss = torch.nn.MSELoss()
self.L1_loss = torch.nn.SmoothL1Loss()
self.C_loss = torch.nn.BCEWithLogitsLoss()
# self.TV_loss = TVLoss(self.TVLossWeight,self.imsize,self.batch_size)
# print networks
logging.info("Generator structure:")
logging.info(self.Generator)
# print(self.Decoder)
logging.info("Discriminator structure:")
logging.info(self.Discriminator)
def build_tensorboard(self):
from tensorboardX import SummaryWriter
# from logger import Logger
# self.logger = Logger(self.log_path)
self.writer = SummaryWriter(log_dir=self.summary_path)
def load_pretrained_model(self):
self.Generator.load_state_dict(torch.load(os.path.join(
self.check_point_path , '{}_Generator.pth'.format(self.pretrained_model))))
self.Discriminator.load_state_dict(torch.load(os.path.join(
self.check_point_path , '{}_Discriminator.pth'.format(self.pretrained_model))))
print('loaded trained models (step: {})..!'.format(self.pretrained_model))
def reset_grad(self):
self.g_optimizer.zero_grad()
# self.decoder_optimizer.zero_grad()
self.d_optimizer.zero_grad()
def save_sample(self, data_iter):
real_images, _ = next(data_iter)
save_image(denorm(real_images), os.path.join(self.sample_path, 'real.png'))
def main(args):
# Step0 ====================================================================
# Set GPU ids
os.environ["CUDA_VISIBLE_DEVICES"] = args.gpu_ids
# Set the file name format
FILE_NAME_FORMAT = "{0}_{1}_{2}_{3:d}{4}".format(args.model, args.dataset,
args.loss, args.epochs,
args.flag)
# Set the results file path
RESULT_FILE_NAME = FILE_NAME_FORMAT + '_results.pkl'
RESULT_FILE_PATH = os.path.join(RESULT_PATH, RESULT_FILE_NAME)
# Set the checkpoint file path
CHECKPOINT_FILE_NAME = FILE_NAME_FORMAT + '.ckpt'
CHECKPOINT_FILE_PATH = os.path.join(CHECKPOINT_PATH, CHECKPOINT_FILE_NAME)
BEST_CHECKPOINT_FILE_NAME = FILE_NAME_FORMAT + '_best.ckpt'
BEST_CHECKPOINT_FILE_PATH = os.path.join(CHECKPOINT_PATH,
BEST_CHECKPOINT_FILE_NAME)
# Set the random seed same for reproducibility
random.seed(190811)
torch.manual_seed(190811)
torch.cuda.manual_seed_all(190811)
torch.backends.cudnn.deterministic = True
torch.backends.cudnn.benchmark = False
# Step1 ====================================================================
# Load dataset
train_dataloader = CycleGAN_Dataloader(name=args.dataset,
num_workers=args.num_workers)
test_dataloader = CycleGAN_Dataloader(name=args.dataset,
train=False,
num_workers=args.num_workers)
print('==> DataLoader ready.')
# Step2 ====================================================================
# Make the model
if args.dataset == 'cityscapes':
A_generator = Generator(num_resblock=6)
B_generator = Generator(num_resblock=6)
A_discriminator = Discriminator()
B_discriminator = Discriminator()
else:
A_generator = Generator(num_resblock=9)
B_generator = Generator(num_resblock=9)
A_discriminator = Discriminator()
B_discriminator = Discriminator()
# Check DataParallel available
if torch.cuda.device_count() > 1:
A_generator = nn.DataParallel(A_generator)
B_generator = nn.DataParallel(B_generator)
A_discriminator = nn.DataParallel(A_discriminator)
B_discriminator = nn.DataParallel(B_discriminator)
# Check CUDA available
if torch.cuda.is_available():
A_generator.cuda()
B_generator.cuda()
A_discriminator.cuda()
B_discriminator.cuda()
print('==> Model ready.')
# Step3 ====================================================================
# Set each loss function
criterion_GAN = nn.MSELoss()
criterion_cycle = nn.L1Loss()
criterion_identity = nn.L1Loss()
criterion_feature = nn.L1Loss()
# Set each optimizer
optimizer_G = optim.Adam(itertools.chain(A_generator.parameters(),
B_generator.parameters()),
lr=args.lr,
betas=(0.5, 0.999))
optimizer_D = optim.Adam(itertools.chain(A_discriminator.parameters(),
B_discriminator.parameters()),
lr=args.lr,
betas=(0.5, 0.999))
# Set learning rate scheduler
def lambda_rule(epoch):
epoch_decay = args.epochs / 2
lr_linear_scale = 1.0 - max(0, epoch + 1 - epoch_decay) \
/ float(epoch_decay+ 1)
return lr_linear_scale
scheduler_G = lr_scheduler.LambdaLR(optimizer_G, lr_lambda=lambda_rule)
scheduler_D = lr_scheduler.LambdaLR(optimizer_D, lr_lambda=lambda_rule)
print('==> Criterion and optimizer ready.')
# Step4 ====================================================================
# Train and validate the model
start_epoch = 0
best_metric = float("inf")
# Initialize the result lists
train_loss_G = []
train_loss_D_A = []
train_loss_D_B = []
# Set image buffer
A_buffer = ImageBuffer(args.buffer_size)
B_buffer = ImageBuffer(args.buffer_size)
if args.resume:
assert os.path.exists(CHECKPOINT_FILE_PATH), 'No checkpoint file!'
checkpoint = torch.load(CHECKPOINT_FILE_PATH)
A_generator.load_state_dict(checkpoint['A_generator_state_dict'])
B_generator.load_state_dict(checkpoint['B_generator_state_dict'])
A_discriminator.load_state_dict(
checkpoint['A_discriminator_state_dict'])
B_discriminator.load_state_dict(
checkpoint['B_discriminator_state_dict'])
optimizer_G.load_state_dict(checkpoint['optimizer_G_state_dict'])
optimizer_D.load_state_dict(checkpoint['optimizer_D_state_dict'])
scheduler_G.load_state_dict(checkpoint['scheduler_G_state_dict'])
scheduler_D.load_state_dict(checkpoint['scheduler_D_state_dict'])
start_epoch = checkpoint['epoch']
train_loss_G = checkpoint['train_loss_G']
train_loss_D_A = checkpoint['train_loss_D_A']
train_loss_D_B = checkpoint['train_loss_D_B']
best_metric = checkpoint['best_metric']
# Save the training information
result_data = {}
result_data['model'] = args.model
result_data['dataset'] = args.dataset
result_data['loss'] = args.loss
result_data['target_epoch'] = args.epochs
result_data['batch_size'] = args.batch_size
# Check the directory of the file path
if not os.path.exists(os.path.dirname(RESULT_FILE_PATH)):
os.makedirs(os.path.dirname(RESULT_FILE_PATH))
if not os.path.exists(os.path.dirname(CHECKPOINT_FILE_PATH)):
os.makedirs(os.path.dirname(CHECKPOINT_FILE_PATH))
print('==> Train ready.')
for epoch in range(args.epochs):
# strat after the checkpoint epoch
if epoch < start_epoch:
continue
print("\n[Epoch: {:3d}/{:3d}]".format(epoch + 1, args.epochs))
epoch_time = time.time()
#=======================================================================
# train and validate the model
tloss_G, tloss_D = train(
train_dataloader, A_generator, B_generator, A_discriminator,
B_discriminator, criterion_GAN, criterion_cycle,
criterion_identity, optimizer_G, optimizer_D, A_buffer, B_buffer,
args.loss, args.lambda_cycle, args.lambda_identity,
criterion_feature, args.lambda_feature, args.attention)
train_loss_G.append(tloss_G)
train_loss_D_A.append(tloss_D['A'])
train_loss_D_B.append(tloss_D['B'])
if (epoch + 1) % 10 == 0:
val(test_dataloader, A_generator, B_generator, A_discriminator,
B_discriminator, epoch + 1, FILE_NAME_FORMAT, args.attention)
# Update the optimizer's learning rate
current_lr = optimizer_G.param_groups[0]['lr']
scheduler_G.step()
scheduler_D.step()
#=======================================================================
current = time.time()
# Save the current result
result_data['current_epoch'] = epoch
result_data['train_loss_G'] = train_loss_G
result_data['train_loss_D_A'] = train_loss_D_A
result_data['train_loss_D_B'] = train_loss_D_B
# Save result_data as pkl file
with open(RESULT_FILE_PATH, 'wb') as pkl_file:
pickle.dump(result_data,
pkl_file,
protocol=pickle.HIGHEST_PROTOCOL)
# Save the best checkpoint
# if train_loss_G < best_metric:
# best_metric = train_loss_G
# torch.save({
# 'epoch': epoch+1,
# 'A_generator_state_dict': A_generator.state_dict(),
# 'B_generator_state_dict': B_generator.state_dict(),
# 'A_discriminator_state_dict': A_discriminator.state_dict(),
# 'B_discriminator_state_dict': B_discriminator.state_dict(),
# 'optimizer_G_state_dict': optimizer_G.state_dict(),
# 'optimizer_D_state_dict': optimizer_D.state_dict(),
# 'scheduler_G_state_dict': scheduler_G.state_dict(),
# 'scheduler_D_state_dict': scheduler_D.state_dict(),
# 'train_loss_G': train_loss_G,
# 'train_loss_D_A': train_loss_D_A,
# 'train_loss_D_B': train_loss_D_B,
# 'best_metric': best_metric,
# }, BEST_CHECKPOINT_FILE_PATH)
# Save the current checkpoint
torch.save(
{
'epoch': epoch + 1,
'A_generator_state_dict': A_generator.state_dict(),
'B_generator_state_dict': B_generator.state_dict(),
'A_discriminator_state_dict': A_discriminator.state_dict(),
'B_discriminator_state_dict': B_discriminator.state_dict(),
'optimizer_G_state_dict': optimizer_G.state_dict(),
'optimizer_D_state_dict': optimizer_D.state_dict(),
'scheduler_G_state_dict': scheduler_G.state_dict(),
'scheduler_D_state_dict': scheduler_D.state_dict(),
'train_loss_G': train_loss_G,
'train_loss_D_A': train_loss_D_A,
'train_loss_D_B': train_loss_D_B,
'best_metric': best_metric,
}, CHECKPOINT_FILE_PATH)
if (epoch + 1) % 10 == 0:
CHECKPOINT_FILE_NAME_epoch = FILE_NAME_FORMAT + '_{0}.ckpt'
CHECKPOINT_FILE_PATH_epoch = os.path.join(
CHECKPOINT_PATH, FILE_NAME_FORMAT, CHECKPOINT_FILE_NAME_epoch)
if not os.path.exists(os.path.dirname(CHECKPOINT_FILE_PATH_epoch)):
os.makedirs(os.path.dirname(CHECKPOINT_FILE_PATH_epoch))
torch.save(
{
'epoch': epoch + 1,
'A_generator_state_dict': A_generator.state_dict(),
'B_generator_state_dict': B_generator.state_dict(),
'A_discriminator_state_dict': A_discriminator.state_dict(),
'B_discriminator_state_dict': B_discriminator.state_dict(),
'optimizer_G_state_dict': optimizer_G.state_dict(),
'optimizer_D_state_dict': optimizer_D.state_dict(),
'scheduler_G_state_dict': scheduler_G.state_dict(),
'scheduler_D_state_dict': scheduler_D.state_dict(),
'train_loss_G': train_loss_G,
'train_loss_D_A': train_loss_D_A,
'train_loss_D_B': train_loss_D_B,
'best_metric': best_metric,
}, CHECKPOINT_FILE_PATH_epoch)
# Print the information on the console
print("model : {}".format(args.model))
print("dataset : {}".format(args.dataset))
print("loss : {}".format(args.loss))
print("batch_size : {}".format(args.batch_size))
print("current lrate : {:f}".format(current_lr))
print("G loss : {:f}".format(tloss_G))
print("D A/B loss : {:f}/{:f}".format(
tloss_D['A'], tloss_D['B']))
print("epoch time : {0:.3f} sec".format(current -
epoch_time))
print("Current elapsed time : {0:.3f} sec".format(current - start))
print('==> Train done.')
print(' '.join(['Results have been saved at', RESULT_FILE_PATH]))
print(' '.join(['Checkpoints have been saved at', CHECKPOINT_FILE_PATH]))
class Model:
def __init__(self, base_path='', epochs=10, learning_rate=0.0002, image_size=256, leaky_relu=0.2,
betas=(0.5, 0.999), lamda=100, image_format='png'):
self.image_size = image_size
self.leaky_relu_threshold = leaky_relu
self.epochs = epochs
self.lr = learning_rate
self.betas = betas
self.lamda = lamda
self.base_path = base_path
self.image_format = image_format
self.count = 1
self.gen = None
self.dis = None
self.gen_optim = None
self.dis_optim = None
self.model_type = None
self.residual_blocks = 9
self.layer_size = 64
self.lr_policy = None
self.lr_schedule_gen = None
self.lr_schedule_dis = None
self.device = self.get_device()
self.create_folder_structure()
def create_folder_structure(self):
checkpoint_folder = self.base_path + '/checkpoints'
loss_folder = self.base_path + '/Loss_Checkpoints'
training_folder = self.base_path + '/Training Images'
test_folder = self.base_path + '/Test Images'
if not os.path.exists(checkpoint_folder):
os.makedirs(checkpoint_folder)
if not os.path.exists(loss_folder):
os.makedirs(loss_folder)
if not os.path.exists(training_folder):
os.makedirs(training_folder)
if not os.path.exists(test_folder):
os.makedirs(test_folder)
def get_device(self):
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
print('Using device:', device)
print(torch.cuda.get_device_name(0))
if device.type == 'cuda':
print('Memory Usage -')
print('Allocated:', round(torch.cuda.memory_allocated(0) / 1024 ** 3, 1), 'GB')
print('Cached: ', round(torch.cuda.memory_cached(0) / 1024 ** 3, 1), 'GB')
return device
else:
return None
def initialize_model(self, lr_schedular_options, model_type='unet', residual_blocks=9, layer_size=64):
all_models = ['unet', 'resnet', 'inception', 'unet2', 'unet_large', 'unet_fusion']
if model_type not in all_models:
raise Exception('This model type is not available!');
self.dis = Discriminator(image_size=self.image_size, leaky_relu=self.leaky_relu_threshold)
if model_type == 'unet':
self.gen = Generator_Unet(image_size=self.image_size, ngf=layer_size)
elif model_type == 'resnet':
self.gen = Generator_RESNET(residual_blocks=residual_blocks, ngf=layer_size)
elif model_type == 'inception':
self.gen = Generator_InceptionNet(ngf=layer_size)
elif model_type == 'unet2':
self.gen = Generator_Unet_2(image_size=self.image_size, ngf=layer_size)
elif model_type == 'unet_large':
self.gen = Generator_Unet_Large(image_size=self.image_size, ngf=layer_size)
elif model_type == 'unet_fusion':
self.gen = Generator_Unet_Fusion(image_size=self.image_size, ngf=layer_size)
if self.device is not None:
self.gen.cuda()
self.dis.cuda()
self.gen_optim = optim.Adam(self.gen.parameters(), lr=self.lr, betas=self.betas)
self.dis_optim = optim.Adam(self.dis.parameters(), lr=self.lr, betas=self.betas)
self.lr_schedule_dis = self.get_learning_schedule(self.gen_optim, lr_schedular_options)
self.lr_schedule_gen = self.get_learning_schedule(self.dis_optim, lr_schedular_options)
self.model_type = model_type
self.layer_size = layer_size
self.residual_blocks = residual_blocks
self.lr_policy = lr_schedular_options
print('Model Initialized !\nGenerator Model Type : {} and Layer Size : {}'.format(model_type, layer_size))
print('Model Parameters are:\nEpochs : {}\nLearning rate : {}\nLeaky Relu Threshold : {}\nLamda : {}\nBeta : {}'
.format(self.epochs, self.lr, self.leaky_relu_threshold, self.lamda, self.betas))
def train_model(self, trainloader, average_loss, eval=(False, None, None), save_model=(False, 25),
display_test_image=(False, None, 25)):
print('We will be using L1 loss with perpetual loss (L1)!')
mean_loss = nn.BCELoss()
l1_loss = nn.L1Loss()
vgg16 = models.vgg16()
vgg16_conv = nn.Sequential(*list(vgg16.children())[:-3])
self.gen.train()
self.dis.train()
batches = len(trainloader)
print('Total number of batches in an epoch are : {}'.format(batches))
sample_img_test = None
if display_test_image[0]:
sample_img_test, rgb_test_images = next(iter(display_test_image[1]))
save_image((rgb_test_images[0].detach().cpu() + 1) / 2,
'{}/Training Images/real_img.{}'.format(self.base_path, self.image_format))
if self.device is not None:
sample_img_test = sample_img_test.cuda()
for i in range(self.epochs):
if eval[0] and (i % eval[2] == 0):
self.evaluate_L1_loss_dataset(eval[1], train=False)
self.evaluate_L1_loss_dataset(trainloader, train=True)
self.gen.train()
running_gen_loss = 0
running_dis_loss = 0
for gray_img, real_img in trainloader:
batch_size = len(gray_img)
zero_label = torch.zeros(batch_size)
one_label = torch.ones(batch_size)
if self.device is not None:
gray_img = gray_img.cuda()
real_img = real_img.cuda()
zero_label = zero_label.cuda()
one_label = one_label.cuda()
# Discriminator loss
self.dis_optim.zero_grad()
fake_img = self.gen(gray_img)
dis_real_loss = mean_loss(self.dis(real_img), one_label)
dis_fake_loss = mean_loss(self.dis(fake_img), zero_label)
total_dis_loss = dis_fake_loss + dis_real_loss
total_dis_loss.backward()
self.dis_optim.step()
# Generator loss
self.gen_optim.zero_grad()
fake_img = self.gen(gray_img)
gen_adv_loss = mean_loss(self.dis(fake_img), one_label)
gen_l1_loss = l1_loss(fake_img.view(batch_size, -1), real_img.view(batch_size, -1))
gen_pre_train = l1_loss(vgg16_conv(fake_img), vgg16_conv(real_img))
total_gen_loss = gen_adv_loss + self.lamda * gen_l1_loss + self.lamda * gen_pre_train
total_gen_loss.backward()
self.gen_optim.step()
running_dis_loss += total_dis_loss.item()
running_gen_loss += total_gen_loss.item()
running_dis_loss /= (batches * 1.0)
running_gen_loss /= (batches * 1.0)
print('Epoch : {}, Generator Loss : {} and Discriminator Loss : {}'.format(i + 1, running_gen_loss,
running_dis_loss))
if display_test_image[0] and i % display_test_image[2] == 0:
self.gen.eval()
out_result = self.gen(sample_img_test)
out_result = out_result.detach().cpu()
out_result = (out_result[0] + 1) / 2
save_image(out_result, '{}/Training Images/epoch_{}.{}'.format(self.base_path, i,
self.image_format))
self.gen.train()
save_tuple = ([running_gen_loss], [running_dis_loss])
average_loss.add_loss(save_tuple)
if save_model[0] and i % save_model[1] == 0:
self.save_checkpoint('checkpoint_epoch_{}'.format(i), self.model_type)
average_loss.save('checkpoint_avg_loss', save_index=0)
self.lr_schedule_gen.step()
self.lr_schedule_dis.step()
for param_grp in self.dis_optim.param_groups:
print('Learning rate after {} epochs is : {}'.format(i + 1, param_grp['lr']))
self.save_checkpoint('checkpoint_train_final', self.model_type)
average_loss.save('checkpoint_avg_loss_final', save_index=0)
def get_learning_schedule(self, optimizer, option):
schedular = None
if option['lr_policy'] == 'linear':
def lambda_rule(epoch):
lr_l = 1.0 - max(0, epoch - option['n_epochs']) / float(option['n_epoch_decay'] + 1)
return lr_l
schedular = lr_schedular.LambdaLR(optimizer, lr_lambda=lambda_rule)
elif option['lr_policy'] == 'plateau':
schedular = lr_schedular.ReduceLROnPlateau(optimizer, mode='min', factor=0.2, threshold=0.01, patience=5)
elif option['lr_policy'] == 'step':
schedular = lr_schedular.StepLR(optimizer, step_size=option['step_size'], gamma=0.1)
elif option['lr_policy'] == 'cosine':
schedular = lr_schedular.CosineAnnealingLR(optimizer, T_max=option['n_epochs'], eta_min=0)
else:
raise Exception('LR Policy not implemented!')
return schedular
def evaluate_model(self, loader, save_filename, no_of_images=1):
# Considering that we have batch size of 1 for test set
if self.gen is None or self.dis is None:
raise Exception('Model has not been initialized and hence cannot be saved!');
counter_images_generated = 0
while counter_images_generated < no_of_images:
gray, rgb = next(iter(loader))
if self.device is not None:
gray = gray.cuda()
filename = '{}/Test Images/{}_{}.{}'.format(self.base_path, save_filename, self.count, self.image_format)
real_filename = '{}/Test Images/{}_{}_real.{}'.format(self.base_path, save_filename, self.count,
self.image_format)
real_gray_filename = '{}/Test Images/{}_{}_real_gray.{}'.format(self.base_path, save_filename, self.count,
self.image_format)
self.count += 1
self.gen.eval()
out = self.gen(gray)
out = out[0].detach().cpu()
out = (out + 1) / 2
save_image(out, filename)
gray_img = gray[0].detach().cpu()
save_image(gray_img, real_gray_filename)
real_img = (rgb[0].detach().cpu() + 1) / 2
save_image(real_img, real_filename)
counter_images_generated += 1
def evaluate_L1_loss_dataset(self, loader, train=False):
if self.gen is None or self.dis is None:
raise Exception('Model has not been initialized and hence cannot be evaluated!')
loss_function = nn.L1Loss()
self.gen.eval()
total_loss = 0.0;
iterations = 0;
for gray, real in loader:
iterations += 1
if self.device is not None:
gray = gray.cuda()
real = real.cuda()
gen_out = self.gen(gray)
iteration_loss = loss_function(gen_out, real)
total_loss += iteration_loss.item()
total_loss = total_loss / (iterations * 1.0)
train_test = 'test'
if train:
train_test = 'train'
print('Total L1 loss over {} set is : {}'.format(train_test, total_loss))
return total_loss;
def change_params(self, epochs=None, learning_rate=None, leaky_relu=None, betas=None, lamda=None):
if epochs is not None:
self.epochs = epochs
print('Changed the number of epochs to {}!'.format(self.epochs))
if learning_rate is not None:
self.lr = learning_rate
print('Changed the learning rate to {}!'.format(self.lr))
if leaky_relu is not None:
self.leaky_relu_threshold = leaky_relu
print('Changed the threshold for leaky relu to {}!'.format(self.leaky_relu_threshold))
if betas is not None:
self.betas = betas
print('Changed the betas for Adams Optimizer!')
if betas is not None or learning_rate is not None:
self.gen_optim = optim.Adam(self.gen.parameters(), lr=self.lr, betas=self.betas)
self.dis_optim = optim.Adam(self.dis.parameters(), lr=self.lr, betas=self.betas)
if lamda is not None:
self.lamda = lamda
print('Lamda value has been changed to {}!'.format(self.lamda))
def set_all_params(self, epochs, lr, leaky_thresh, lamda, beta):
self.epochs = epochs
self.lr = lr
self.leaky_relu_threshold = leaky_thresh
self.lamda = lamda
self.betas = beta
self.gen_optim = optim.Adam(self.gen.parameters(), lr=self.lr, betas=self.betas)
self.dis_optim = optim.Adam(self.dis.parameters(), lr=self.lr, betas=self.betas)
print('Model Parameters are:\nEpochs : {}\nLearning rate : {}\nLeaky Relu Threshold : {}\nLamda : {}\nBeta : {}'
.format(self.epochs, self.lr, self.leaky_relu_threshold, self.lamda, self.betas))
def run_model_on_dataset(self, loader, save_folder, save_path=None):
if self.gen is None or self.dis is None:
raise Exception('Model has not been initialized and hence cannot be saved!');
index = 1
if save_path is None:
save_path = self.base_path
for gray, dummy in loader:
if self.device is not None:
gray = gray.cuda()
filename = '{}/{}/{}.{}'.format(save_path, save_folder, index, self.image_format)
index += 1
self.gen.eval()
out = self.gen(gray)
out = out[0].detach().cpu()
out = (out + 1) / 2
save_image(out, filename)
def save_checkpoint(self, filename, model_type='unet'):
if self.gen is None or self.dis is None:
raise Exception('The model has not been initialized and hence cannot be saved !')
filename = '{}/checkpoints/{}.pth'.format(self.base_path, filename)
save_dict = {'model_type': model_type, 'dis_dict': self.dis.state_dict(), 'gen_dict': self.gen.state_dict(),
'lr': self.lr,
'epochs': self.epochs, 'betas': self.betas, 'image_size': self.image_size,
'leaky_relu_thresh': self.leaky_relu_threshold, 'lamda': self.lamda, 'base_path': self.base_path,
'count': self.count, 'image_format': self.image_format, 'device': self.device,
'residual_blocks': self.residual_blocks, 'layer_size': self.layer_size,
'lr_policy': self.lr_policy}
torch.save(save_dict, filename)
print('The model checkpoint has been saved !')
def load_checkpoint(self, filename):
filename = '{}/checkpoints/{}.pth'.format(self.base_path, filename)
if not pathlib.Path(filename).exists():
raise Exception('This checkpoint does not exist!')
self.gen = None
self.dis = None
save_dict = torch.load(filename)
self.betas = save_dict['betas']
self.image_size = save_dict['image_size']
self.epochs = save_dict['epochs']
self.leaky_relu_threshold = save_dict['leaky_relu_thresh']
self.lamda = save_dict['lamda']
self.lr = save_dict['lr']
self.base_path = save_dict['base_path']
self.count = save_dict['count']
self.image_format = save_dict['image_format']
self.device = save_dict['device']
self.residual_blocks = save_dict['residual_blocks']
self.layer_size = save_dict['layer_size']
self.lr_policy = save_dict['lr_policy']
device = self.get_device()
if device != self.device:
error_msg = ''
if self.device is None:
error_msg = 'The model was trained on CPU and will therefore be continued on CPU only!'
else:
error_msg = 'The model was trained on GPU and cannot be loaded on a CPU machine!'
raise Exception(error_msg)
self.initialize_model(model_type=save_dict['model_type'], residual_blocks=self.residual_blocks,
layer_size=self.layer_size, lr_schedular_options=self.lr_policy)
self.gen.load_state_dict(save_dict['gen_dict'])
self.dis.load_state_dict(save_dict['dis_dict'])
print('The model checkpoint has been restored!')
def train(FLAGS):
# Define the hyperparameters
p_every = FLAGS.p_every
s_every = FLAGS.s_every
epochs = FLAGS.epochs
dlr = FLAGS.dlr
glr = FLAGS.glr
beta1 = FLAGS.beta1
beta2 = FLAGS.beta2
z_size = FLAGS.zsize
batch_size = FLAGS.batch_size
rh = FLAGS.resize_height
rw = FLAGS.resize_width
d_path = FLAGS.dataset_path
d_type = FLAGS.dataset_type
# Preprocessing Data
transform = transforms.Compose([
transforms.Resize((rh, rw)),
transforms.ToTensor(),
transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))
])
if FLAGS.dataset_path == None:
if d_type == "cars":
if not os.path.exists('./datasets/cars_train'):
os.system('sh ./datasets/dload.sh cars')
d_path = './datasets/cars_train/'
elif d_type == "flowers":
if not os.path.exists('./datasets/flowers/'):
os.system('sh ./datasets/dload.sh flowers')
d_path = './datasets/flowers/'
elif d_type == "dogs":
if not os.path.exists('./datasets/jpg'):
os.system('sh ./datasets/dload.sh dogs')
d_path = './datasets/jpg/'
train_data = datasets.ImageFolder(d_path, transform=transform)
trainloader = DataLoader(train_data, batch_size=batch_size, shuffle=True)
# Define the D and G
dis = Discriminator(64)
gen = Generator()
# Apply weight initialization
dis.apply(init_weight)
gen.apply(init_weight)
# Define the loss function
criterion = nn.BCELoss()
# Optimizers
d_opt = optim.Adam(dis.parameters(), lr=dlr, betas=(beta1, beta2))
g_opt = optim.Adam(gen.parameters(), lr=glr, betas=(beta1, beta2))
# Train loop
device = torch.device(
'cuda') if torch.cuda.is_available() else torch.device('cpu')
train_losses = []
eval_losses = []
dis.to(device)
gen.to(device)
real_label = 1
fake_label = 0
for e in range(epochs):
td_loss = 0
tg_loss = 0
for batch_i, (real_images, _) in enumerate(trainloader):
real_images = real_images.to(device)
batch_size = real_images.size(0)
#### Train the Discriminator ####
d_opt.zero_grad()
d_real = dis(real_images)
label = torch.full((batch_size, ), real_label, device=device)
r_loss = criterion(d_real, label)
r_loss.backward()
z = torch.randn(batch_size, z_size, 1, 1, device=device)
fake_images = gen(z)
label.fill_(fake_label)
d_fake = dis(fake_images.detach())
f_loss = criterion(d_fake, label)
f_loss.backward()
d_loss = r_loss + f_loss
d_opt.step()
#### Train the Generator ####
g_opt.zero_grad()
label.fill_(real_label)
d_fake2 = dis(fake_images)
g_loss = criterion(d_fake2, label)
g_loss.backward()
g_opt.step()
if batch_i % p_every == 0:
print ('Epoch [{:5d} / {:5d}] | d_loss: {:6.4f} | g_loss: {:6.4f}'. \
format(e+1, epochs, d_loss, g_loss))
train_losses.append([td_loss, tg_loss])
if e % s_every == 0:
d_ckpt = {
'model_state_dict': dis.state_dict(),
'opt_state_dict': d_opt.state_dict()
}
g_ckpt = {
'model_state_dict': gen.state_dict(),
'opt_state_dict': g_opt.state_dict()
}
torch.save(d_ckpt, 'd-nm-{}.pth'.format(e))
torch.save(g_ckpt, 'g-nm-{}.pth'.format(e))
utils.save_image(fake_images.detach(),
'fake_{}.png'.format(e),
normalize=True)
print('[INFO] Training Completed successfully!')
class Pix2PixMain(object):
def __init__(self):
# -----------------------------------
# global
# -----------------------------------
np.random.seed(Settings.SEED)
torch.manual_seed(Settings.SEED)
random.seed(Settings.SEED)
if torch.cuda.is_available():
torch.cuda.manual_seed(Settings.SEED)
self.device = torch.device("cuda")
else:
self.device = torch.device("cpu")
# -----------------------------------
# model
# -----------------------------------
self.generator = Generator(in_c=Settings.IN_CHANNEL,
out_c=Settings.OUT_CHANNEL,
ngf=Settings.NGF).to(self.device)
self.generator.apply(self.generator.weights_init)
self.discriminator = Discriminator(
in_c=Settings.IN_CHANNEL,
out_c=Settings.OUT_CHANNEL,
ndf=Settings.NDF,
n_layers=Settings.DISCRIMINATOR_LAYER).to(self.device)
self.discriminator.apply(self.discriminator.weights_init)
print("model init done")
# -----------------------------------
# data
# -----------------------------------
train_transforms = transforms.Compose([
transforms.Resize((Settings.INPUT_SIZE, Settings.INPUT_SIZE)),
transforms.ToTensor(),
transforms.Normalize([0.5, 0.5, 0.5], [0.5, 0.5, 0.5])
])
data_prepare = get_dataloader(
dataset_name=Settings.DATASET,
batch_size=Settings.BATCH_SIZE,
data_root=Settings.DATASET_ROOT,
train_num_workers=Settings.TRAIN_NUM_WORKERS,
transforms=train_transforms,
val_num_workers=Settings.TEST_NUM_WORKERS)
self.train_dataloader = data_prepare.train_dataloader
self.test_dataloader = data_prepare.test_dataloader
print("data init done.....")
# -----------------------------------
# optimizer and criterion
# -----------------------------------
self.optimG = optim.Adam([{
"params": self.generator.parameters()
}],
lr=Settings.G_LR,
betas=Settings.G_BETAS)
self.optimD = optim.Adam([{
"params": self.discriminator.parameters()
}],
lr=Settings.D_LR,
betas=Settings.D_BETAS)
self.criterion_l1loss = nn.L1Loss()
self.criterion_BCE = nn.BCELoss()
print("optimizer and criterion init done.....")
# -----------------------------------
# recorder
# -----------------------------------
self.recorder = {
"errD_fake": list(),
"errD_real": list(),
"errG_l1loss": list(),
"errG_bce": list(),
"errG": list(),
"accD": list()
}
output_file = time.strftime(
"{}_{}_%Y_%m_%d_%H_%M_%S".format("pix2pix", Settings.DATASET),
time.localtime())
self.output_root = os.path.join(Settings.OUTPUT_ROOT, output_file)
os.makedirs(os.path.join(self.output_root, Settings.OUTPUT_MODEL_KEY))
os.makedirs(os.path.join(self.output_root, Settings.OUTPUT_LOG_KEY))
os.makedirs(os.path.join(self.output_root, Settings.OUTPUT_IMAGE_KEY))
print("recorder init done.....")
def __call__(self):
print_steps = max(
1, int(len(self.train_dataloader) * Settings.PRINT_FREQUENT))
eval_steps = max(
1, int(len(self.train_dataloader) * Settings.EVAL_FREQUENT))
batch_steps = max(1, int(Settings.EPOCHS * Settings.BATCH_FREQUENT))
print("begin train.....")
for epoch in range(1, Settings.EPOCHS + 1):
for step, batch in enumerate(self.train_dataloader):
# train
self.train_module(batch)
# print
self.print_module(epoch, step, print_steps)
if epoch % batch_steps == 0:
# val
self.val_module(epoch, step, eval_steps)
# save log
self.log_save_module()
def train_module(self, batch):
self.generator.train()
self.discriminator.train()
input_images = None
target_images = None
if Settings.DATASET == "edge2shoes":
input_images = batch["edge_images"].to(self.device)
target_images = batch["color_images"].to(self.device)
elif Settings.DATASET == "Mogaoku":
input_images = batch["edge_images"].to(self.device)
target_images = batch["color_images"].to(self.device)
else:
KeyError("DataSet {} doesn't exit".format(Settings.DATASET))
# 判别器迭代
self.optimD.zero_grad()
true_image_d_pred = self.discriminator(input_images, target_images)
true_images_label = torch.full(true_image_d_pred.shape,
Settings.REAL_LABEL,
dtype=torch.float32,
device=self.device)
errD_real_bce = self.criterion_BCE(true_image_d_pred,
true_images_label)
errD_real_bce.backward()
fake_images = self.generator(input_images)
fake_images_d_pred = self.discriminator(input_images,
fake_images.detach())
fake_images_label = torch.full(fake_images_d_pred.shape,
Settings.FAKE_LABEL,
dtype=torch.float32,
device=self.device)
errD_fake_bce = self.criterion_BCE(fake_images_d_pred,
fake_images_label)
errD_fake_bce.backward()
self.optimD.step()
real_image_pred_true_num = ((true_image_d_pred >
0.5) == true_images_label).sum().float()
fake_image_pred_true_num = ((fake_images_d_pred >
0.5) == fake_images_label).sum().float()
accD = (real_image_pred_true_num + fake_image_pred_true_num) / \
(true_images_label.numel() + fake_images_label.numel())
# 生成器迭代
self.optimG.zero_grad()
fake_images_d_pred = self.discriminator(input_images, fake_images)
true_images_label = torch.full(fake_images_d_pred.shape,
Settings.REAL_LABEL,
dtype=torch.float32,
device=self.device)
errG_bce = self.criterion_BCE(fake_images_d_pred, true_images_label)
errG_l1loss = self.criterion_l1loss(fake_images, target_images)
errG = errG_bce + errG_l1loss * Settings.L1_LOSS_LAMUDA
errG.backward()
self.optimG.step()
# recorder
self.recorder["errD_real"].append(errD_real_bce.item())
self.recorder["errD_fake"].append(errD_fake_bce.item())
self.recorder["errG_l1loss"].append(errG_l1loss.item())
self.recorder["errG_bce"].append(errG_bce.item())
self.recorder["errG"].append(errG.item())
self.recorder["accD"].append(accD)
def val_module(self, epoch, step, eval_steps):
def apply_dropout(m):
if type(m) == nn.Dropout:
m.train()
if (step + 1) % eval_steps == 0:
output_images = None
output_count = 0
self.generator.eval()
self.discriminator.eval()
# 启用dropout
if Settings.USING_DROPOUT_DURING_EVAL:
self.generator.apply(apply_dropout)
self.discriminator.apply(apply_dropout)
for eval_step, eval_batch in enumerate(self.test_dataloader):
input_images = eval_batch["edge_images"].to(self.device)
target_images = eval_batch["color_images"]
pred_images = self.generator(input_images).detach().cpu()
output_image = torch.cat(
[input_images.cpu(), target_images, pred_images], dim=3)
if output_images is None:
output_images = output_image
else:
output_images = torch.cat([output_images, output_image],
dim=0)
if output_images.shape[0] == int(
len(self.test_dataloader) / 4):
output_images = make_grid(
output_images,
padding=2,
normalize=True,
nrow=Settings.CONSTANT_FEATURE_DIS_LEN).numpy()
output_images = np.array(
np.transpose(output_images, (1, 2, 0)) * 255,
dtype=np.uint8)
output_images = Image.fromarray(output_images)
output_images.save(
os.path.join(
self.output_root, Settings.OUTPUT_IMAGE_KEY,
"epoch_{}_step_{}_count_{}.jpg".format(
epoch, step, output_count)))
output_count += 1
output_images = None
self.model_save_module(epoch, step)
self.log_save_module()
def print_module(self, epoch, step, print_steps):
if (step + 1) % print_steps == 0:
print("[{}/{}]\t [{}/{}]\t ".format(epoch, Settings.EPOCHS,
step + 1,
len(self.train_dataloader)),
end=" ")
for key in self.recorder:
print("[{}:{}]\t".format(key, self.recorder[key][-1]), end=" ")
print(" ")
def model_save_module(self, epoch, step):
torch.save(
self.generator.state_dict(),
os.path.join(
self.output_root, Settings.OUTPUT_MODEL_KEY,
"pix2pix_generator_epoch_{}_step_{}.pth".format(epoch, step)))
torch.save(
self.discriminator.state_dict(),
os.path.join(
self.output_root, Settings.OUTPUT_MODEL_KEY,
"pix2pix_discriminator_epoch_{}_step_{}.pth".format(
epoch, step)))
def log_save_module(self):
# 保存记录
with open(
os.path.join(self.output_root, Settings.OUTPUT_LOG_KEY,
"log.txt"), "w") as f:
for item_ in range(len(self.recorder["accD"])):
for key in self.recorder:
f.write("{}:{}\t".format(key, self.recorder[key][item_]))
f.write("\n")
# 保存图表
for key in self.recorder:
plt.figure(figsize=(10, 5))
plt.title("{} During Training".format(key))
plt.plot(self.recorder[key], label=key)
plt.xlabel("iterations")
plt.ylabel("value")
plt.legend()
if "acc" in key:
plt.yticks(np.arange(0, 1, 0.5))
plt.savefig(
os.path.join(self.output_root, Settings.OUTPUT_LOG_KEY,
"{}.jpg".format(key)))
plt.close("all")
def learning_rate_decay_module(self, epoch):
if epoch % Settings.LR_DECAY_EPOCHS == 0:
for param_group in self.optimD.param_groups:
param_group["lr"] *= 0.2
for param_group in self.optimG.param_groups:
param_group["lr"] *= 0.2
