def train(training_config):
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
perceptual_loss_net = PerceptualLossNet(requires_grad=False).to(device)
transformer_net = TransformerNet().train().to(device)
optimizer = torch.optim.Adam(transformer_net.parameters(), lr=training_config['learning_rate'])
style_img_path = os.path.join(training_config['style_images_dir'], training_config['style_image_name'])
style_image = prepare_img(style_img_path, training_config['height'], device)
features_for_style_image = perceptual_loss_net(style_image)
style_targets = features_for_style_image.style_features
train_loader = get_training_data_loader(training_config)
writer_stylized = SummaryWriter(f'runs/stylized')
writer_real = SummaryWriter(f'runs/real')
step = 0
for epoch in range(training_config['num_of_epochs']):
for batch_id, (content_batch, _) in enumerate(train_loader):
# step1: Calculate the content targets
content_batch = content_batch.to(device)
features_for_content_batch = perceptual_loss_net(content_batch)
content_targets = features_for_content_batch.content_features
# step2: Calculate the content_features and style_features for stylized_content_batch
stylized_content_batch = transformer_net(content_batch)
features_for_stylized_content_batch = perceptual_loss_net(stylized_content_batch)
content_features = features_for_stylized_content_batch.content_features
style_features = features_for_stylized_content_batch.style_features
# step3: calculate content_loss, style_loss, tv_loss
content_loss = training_config['content_weight'] * calculate_content_loss(content_targets, content_features)
style_loss = training_config['style_weight'] * calculate_style_loss(style_targets, style_features)
tv_loss = training_config['tv_weight'] * calculate_tv_loss(stylized_content_batch)
# step4: calculate total_loss
total_loss = content_loss + style_loss + tv_loss
total_loss.backward()
optimizer.step()
optimizer.zero_grad() # clear gradients for the next round
if batch_id % 20 == 0:
print(f'Epochs: {epoch} | total_loss: {total_loss.item():12.4f} | content_loss: {content_loss.item():12.4f} | style_loss: {style_loss.item():12.4f} | tv_loss: {tv_loss.item():12.4f}')
display_image(content_batch)
display_image(stylized_content_batch)
with torch.no_grad():
image_grid_stylized = torchvision.utils.make_grid(stylized_content_batch, normalize=True)
image_grid_real = torchvision.utils.make_grid(content_batch, normalize=True)
writer_stylized.add_image('stylized image', image_grid_stylized, global_step=step)
writer_real.add_image('original image', image_grid_real, global_step=step)
training_state = get_training_metadata(training_config)
training_state['state_dict'] = transformer_net.state_dict()
training_state['optimizer_state'] = optimizer.state_dict()
model_name = f'style_{training_config["style_image_name"].split(".")[0]}_datapoints_{training_state["num_of_datapoints"]}_cw_{str(training_config["content_weight"])}_sw_{str(training_config["style_weight"])}_tw_{str(training_config["tv_weight"])}.pth'
torch.save(training_state, os.path.join(training_config["model_binaries_path"], model_name))
def train():
pretrain, code_id, word_id = source_prepare()
print('%d different words, %d different codes' % (len(word_id), len(code_id)), flush=True)
criterion = nn.CrossEntropyLoss()
Acc = 0.
for fold in range(5):
Net = TransformerNet(Pretrain_type, pretrain, Max_seq_len, Embedding_size, Inner_hid_size, len(code_id), D_k,
D_v, dropout_ratio=Dropout, num_layers=Num_layers, num_head=Num_head, Freeze=Freeze_emb).cuda()
optimizer = optim.Adam(Net.parameters(), lr=Learning_rate, eps=1e-08, weight_decay=Weight_decay)
# train_file = DATA_path + 'AskAPatient/AskAPatient.fold-' + str(fold) + '.train.txt'
# val_file = DATA_path + 'AskAPatient/AskAPatient.fold-' + str(fold) + '.validation.txt'
train_file = DATA_path + 'trainsplit_' + str(fold) + '.csv'
val_file = DATA_path + 'val_' + str(fold) + '.csv'
train_data = tokenizer(word_id, code_id, train_file, pretrain_type=Pretrain_type)
val_data = tokenizer(word_id, code_id, val_file, pretrain_type=Pretrain_type)
print('Fold %d: %d training data, %d validation data' % (fold, len(train_data.data), len(val_data.data)))
print('max length: %d %d' % (train_data.max_length, val_data.max_length), flush=True)
for e in range(Epoch):
train_data.reset_epoch()
Net.train()
while not train_data.epoch_finish:
optimizer.zero_grad()
seq, label, seq_length, mask, seq_pos, standard_emb = train_data.get_batch(Batch_size)
results = Net(seq, seq_pos, standard_emb)
loss = criterion(results, label)
loss.backward()
optimizer.step()
if (e + 1) % Val_every == 0:
Net.eval()
train_data.reset_epoch()
train_correct = 0
i = 0
while not train_data.epoch_finish:
seq, label, seq_length, mask, seq_pos, standard_emb = train_data.get_batch(Batch_size)
results = Net(seq, seq_pos, standard_emb)
_, idx = results.max(1)
train_correct += len((idx == label).nonzero())
i += Batch_size
# assert i == len(train_data.data)
train_accuracy = float(train_correct) / float(i)
val_data.reset_epoch()
val_correct = 0
i = 0
while not val_data.epoch_finish:
seq, label, seq_length, mask, seq_pos, standard_emb = val_data.get_batch(Batch_size)
results = Net(seq, seq_pos, standard_emb)
_, idx = results.max(1)
val_correct += len((idx == label).nonzero())
i += Batch_size
# assert i == len(val_data.data)
val_accuracy = float(val_correct) / float(len(val_data.data))
print('[fold %d epoch %d] training loss: %.4f, % d correct, %.4f accuracy;'
' validation: %d correct, %.4f accuracy' %
(fold, e, loss.item(), train_correct, train_accuracy, val_correct, val_accuracy), flush=True)
torch.save(Net.state_dict(), SAVE_DIR + 'data1_false_biobert_' + str(fold) + '_' + str(e))
if (e + 1) % LR_decay_epoch == 0:
adjust_learning_rate(optimizer, LR_decay)
print('learning rate decay!', flush=True)
Acc += val_accuracy
del train_data, val_data
gc.collect()
print('finial validation accuracy: %.4f' % (Acc / 5))
def train(content_img_name=None, style_img_name=None, features=None):
transformer = TransformerNet()
# features = Vgg16()
lr = 0.001
weight_content = 1e5
weight_style = 1e10
optimizer = torch.optim.Adam(transformer.parameters(), lr)
mse_loss = torch.nn.MSELoss()
style = load_image(style_img_name)
style = style_transform(style)
style = style.unsqueeze(0)
style_v = Variable(style)
style_v = normalize_batch(style_v)
features_style = features(style_v)
gram_style = [gram_matrix(y) for y in features_style]
transformer.train()
x = load_image(content_img_name)
x = content_transform(x)
x = x.unsqueeze(0)
x = Variable(x)
if use_cuda:
transformer.cuda()
features.cuda()
x = x.cuda()
gram_style = [gram.cuda() for gram in gram_style]
# training
count = 0
log_name = './logs/log_exp_{}.txt'.format(exp_num)
log = []
while count < iteration_total:
optimizer.zero_grad()
y = transformer(x)
y = normalize_batch(y)
x = normalize_batch(x)
features_y = features(y)
features_x = features(x)
loss_content = mse_loss(features_y[1], features_x[1])
loss_style = 0.
for ft_y, gm_s in zip(features_y, gram_style):
gm_y = gram_matrix(ft_y)
loss_style = loss_style + mse_loss(gm_y, gm_s)
total_loss = weight_content * loss_content + weight_style * loss_style
total_loss.backward()
optimizer.step()
# log show
count += 1
msg = '{}\titeration: {}\tcontent: {:.6f}\tstyle: {:.6f}\ttotal: {:.6f}\n'.format(
time.ctime(), count, loss_content.item(), loss_style.item(),
total_loss.item())
log.append(msg)
if count % 50 == 0:
print(''.join(log))
with open(log_name, 'a') as f:
f.writelines(''.join(log))
log.clear()
# save model
transformer.eval()
if use_cuda:
transformer.cpu()
save_model_name = './models/model_exp_{}.pt'.format(exp_num)
torch.save(transformer.state_dict(), save_model_name)
def train(**kwargs):
opt = Config()
for _k, _v in kwargs.items():
setattr(opt, _k, _v)
device = t.device("cuda" if t.cuda.is_available() else "cpu")
vis = utils.Visualizer(opt.env)
# 数据加载
transforms = tv.transforms.Compose([
tv.transforms.Resize(opt.image_size),
tv.transforms.CenterCrop(opt.image_size),
tv.transforms.ToTensor(),
tv.transforms.Lambda(lambda x: x * 255)
])
dataset = tv.datasets.ImageFolder(opt.data_root, transforms)
dataloader = data.DataLoader(dataset, opt.batch_size)
# 风格转换网络
transformer = TransformerNet()
if opt.model_path:
transformer.load_state_dict(
t.load(opt.model_path, map_location=t.device('cpu')))
transformer.to(device)
# 损失网络 Vgg16
vgg = Vgg16().eval()
vgg.to(device)
for param in vgg.parameters():
param.requires_grad = False
# 优化器
optimizer = t.optim.Adam(transformer.parameters(), opt.lr)
# 获取风格图片的数据
style = utils.get_style_data(opt.style_path)
vis.img('style', (style.data[0] * 0.225 + 0.45).clamp(min=0, max=1))
style = style.to(device)
# 风格图片的gramj矩阵
with t.no_grad():
features_style = vgg(style)
gram_style = [utils.gram_matrix(y) for y in features_style]
# 损失统计
style_loss_avg = 0
content_loss_avg = 0
for epoch in range(opt.epoches):
for ii, (x, _) in tqdm(enumerate(dataloader)):
# 训练
optimizer.zero_grad()
x = x.to(device)
y = transformer(x)
# print(y.size())
y = utils.normalize_batch(y)
x = utils.normalize_batch(x)
features_x = vgg(x)
features_y = vgg(y)
# content loss
content_loss = opt.content_weight * F.mse_loss(
features_y.relu3_3, features_x.relu3_3)
# style loss
style_loss = 0
for ft_y, gm_s in zip(features_y, gram_style):
with t.no_grad():
gram_y = utils.gram_matrix(ft_y)
style_loss += F.mse_loss(gram_y, gm_s.expand_as(gram_y))
style_loss *= opt.style_weight
total_loss = content_loss + style_loss
total_loss.backward()
optimizer.step()
content_loss_avg += content_loss.item()
style_loss_avg += style_loss.item()
if (ii + 1) % opt.plot_every == 0:
vis.plot('content_loss', content_loss_avg / opt.plot_every)
vis.plot('style_loss', style_loss_avg / opt.plot_every)
content_loss_avg = 0
style_loss_avg = 0
vis.img('output',
(y.data.cpu()[0] * 0.225 + 0.45).clamp(min=0, max=1))
vis.img('input', (x.data.cpu()[0] * 0.225 + 0.45).clamp(min=0,
max=1))
if (ii + 1) % opt.save_every == 0:
vis.save([opt.env])
t.save(transformer.state_dict(),
'checkpoints/%s_style.pth' % (ii + 1))
def train(args):
device = torch.device("cpu")
np.random.seed(args.seed)
torch.manual_seed(args.seed)
# load dataset
transform = transforms.Compose([
transforms.Resize(args.image_size),
transforms.CenterCrop(args.image_size),
transforms.ToTensor(),
transforms.Lambda(lambda x: x.mul(255))
])
train_dataset = datasets.ImageFolder(args.dataset, transform)
train_loader = DataLoader(train_dataset, batch_size=args.batch_size)
# load style image
style_transform = transforms.Compose([
transforms.ToTensor(),
transforms.Lambda(lambda x: x.mul(255))
])
style = utils.load_image(args.style_image, size=args.style_size)
style = style_transform(style)
style = style.repeat(args.batch_size, 1, 1, 1).to(device)
# load network
transformer = TransformerNet().to(device)
vgg = Vgg16(requires_grad=False).to(device)
# define optimizer and loss function
optimizer = Adam(transformer.parameters(), args.lr)
mse_loss = torch.nn.MSELoss()
features_style = vgg(utils.normalize_batch(style))
gram_style = [utils.gram_matrix(y) for y in features_style]
for e in range(args.epochs):
transformer.train()
count = 0
for batch_id, (x, _) in enumerate(train_loader):
count += len(x)
optimizer.zero_grad()
image_original = x.to(device)
image_transformed = transformer(x)
image_original = utils.normalize_batch(image_original)
image_transformed = utils.normalize_batch(image_transformed)
# extract features for compute content loss
features_original= vgg(image_original)
features_transformed = vgg(image_transformed)
content_loss = args.content_weight * mse_loss(features_transformed.relu3_3, features_original.relu3_3)
# extract features for compute style loss
style_loss = 0.
for ft_y, gm_s in zip(features_transformed, gram_style):
gm_y = utils.gram_matrix(ft_y)
style_loss += mse_loss(gm_y, gm_s[:len(x), :, :])
style_loss *= args.style_weight
total_loss = content_loss + style_loss
total_loss.backward()
optimizer.step()
if (batch_id + 1) % 200 == 0:
print("Epoch {}:[{}/{}]".format(e + 1, count, len(train_dataset)))
# save model
transformer.eval().cpu()
save_model_filename = "epoch_" + str(args.epochs) + "_" + str(args.content_weight) + "_" + str(args.style_weight) + ".model"
save_model_path = os.path.join(args.save_model_dir, save_model_filename)
torch.save(transformer.state_dict(), save_model_path)
print("\nDone, trained model saved at", save_model_path)
def train(args):
device = torch.device("cuda" if args.cuda else "cpu")
if args.backbone == "vgg":
content_layer = ['relu_4']
style_layer = ['relu_2', 'relu_4', 'relu_7', 'relu_10']
elif args.backbone == "resnet":
content_layer = ["conv_3"]
style_layer = ["conv_1", "conv_2", "conv_3", "conv_4"]
total_layer = list(dict.fromkeys(content_layer + style_layer))
np.random.seed(args.seed)
torch.manual_seed(args.seed)
transform = transforms.Compose([
transforms.Resize(args.image_size),
transforms.CenterCrop(args.image_size),
transforms.ToTensor(),
transforms.Lambda(lambda x: x.mul(255))
])
train_dataset = datasets.ImageFolder(args.dataset, transform)
train_loader = DataLoader(train_dataset, batch_size=args.batch_size)
transformer = TransformerNet().to(device)
optimizer = Adam(transformer.parameters(), args.lr)
mse_loss = torch.nn.MSELoss()
if args.backbone == "vgg":
loss_model = vgg16().eval().to(device)
elif args.backbone == "resnet":
loss_model = resnet().eval().to(device)
style_transform = transforms.Compose(
[transforms.ToTensor(),
transforms.Lambda(lambda x: x.mul(255))])
style = utils.load_image(args.style_image, size=args.style_size)
style = style_transform(style)
style = style.repeat(args.batch_size, 1, 1, 1).to(device)
feature_style = loss_model(utils.normalize_batch(style), style_layer)
gram_style = {
key: utils.gram_matrix(val)
for key, val in feature_style.items()
}
for e in range(args.epochs):
transformer.train()
agg_content_loss = 0.
agg_style_loss = 0.
count = 0
for batch_id, (x, _) in enumerate(train_loader):
n_batch = len(x)
count += n_batch
optimizer.zero_grad()
x = x.to(device)
y = transformer(x)
y = utils.normalize_batch(y)
x = utils.normalize_batch(x)
feature_y = loss_model(y, total_layer)
feature_x = loss_model(x, content_layer)
content_loss = 0.
for layer in content_layer:
content_loss += args.content_weight * mse_loss(
feature_y[layer], feature_x[layer])
style_loss = 0.
for name in style_layer:
gm_y = utils.gram_matrix(feature_y[name])
style_loss += mse_loss(gm_y, gram_style[name][:n_batch, :, :])
style_loss *= args.style_weight
total_loss = content_loss + style_loss
total_loss.backward()
optimizer.step()
agg_content_loss += content_loss.item()
agg_style_loss += style_loss.item()
if (batch_id + 1) % args.log_interval == 0:
mesg = "{}\tEpoch {}:\t[{}/{}]\tcontent: {:.6f}\tstyle: {:.6f}\ttotal: {:.6f}".format(
time.ctime(), e + 1, count, len(train_dataset),
agg_content_loss / (batch_id + 1),
agg_style_loss / (batch_id + 1),
(agg_content_loss + agg_style_loss) / (batch_id + 1))
print(mesg)
if args.checkpoint_model_dir is not None and (
batch_id + 1) % args.checkpoint_interval == 0:
transformer.eval().cpu()
ckpt_model_filename = "ckpt_epoch_" + str(
e) + "_batch_id_" + str(batch_id + 1) + ".pth"
ckpt_model_path = os.path.join(args.checkpoint_model_dir,
ckpt_model_filename)
torch.save(transformer.state_dict(), ckpt_model_path)
transformer.to(device).train()
# save model
transformer.eval().cpu()
save_model_filename = "epoch_" + str(args.epochs) + "_" + str(
time.ctime()).replace(' ', '_') + "_" + str(
args.content_weight) + "_" + str(args.style_weight) + ".model"
save_model_path = os.path.join(args.save_model_dir, save_model_filename)
torch.save(transformer.state_dict(), save_model_path)
print("\nDone, trained model saved at", save_model_path)