def train(output_filename, model_type, hidden_size, loss_type, norm_type,
sigma_noise):
train_data = torchvision.datasets.MNIST(
root='datasets/mnist/',
train=True,
transform=torchvision.transforms.ToTensor(),
download=False,
)
train_loader = Data.DataLoader(dataset=train_data,
batch_size=BATCH_SIZE,
shuffle=True)
if loss_type == 'l2':
loss_func = nn.MSELoss()
elif loss_type == 'cross_entropy':
loss_func = F.binary_cross_entropy
if model_type == 'AE':
model = AutoEncoder(hidden_size).cuda()
elif model_type == 'LTAE':
model = LatentAutoEncoder(hidden_size, norm_type,
sigma=sigma_noise).cuda()
model.set_device()
elif model_type == 'VAE':
model = VariationalAE(hidden_size).cuda()
optimizer = torch.optim.Adam(model.parameters(), lr=0.001)
model.train()
for epoch in range(EPOCH):
for step, (x, _) in enumerate(train_loader):
optimizer.zero_grad()
x_batch = x.view(-1, 28 * 28).cuda()
y_batch = x.view(-1, 28 * 28).cuda()
if model_type == 'AE':
_, decoded = model(x_batch)
loss = loss_func(decoded, y_batch)
elif model_type == 'LTAE':
_, latent, transformed, decoded = model(x_batch)
loss = loss_func(decoded, y_batch)
loss += torch.nn.functional.mse_loss(transformed, latent)
elif model_type == 'VAE':
decoded, mu, logvar = model(x_batch)
loss = loss_func_vae(decoded, x_batch, mu, logvar, loss_type)
loss.backward()
optimizer.step()
if epoch % 10 == 0:
print('Epoch: ', epoch, '| train loss: %.4f' % loss.detach().cpu())
torch.save({'state_dict': model.state_dict()},
f'./saved_models/{output_filename}')
def main(args):
device = torch.device(
'cuda' if torch.cuda.is_available() and not args.cpu else 'cpu')
print('Using %s device.' % device)
world_size = int(
os.environ[args.env_size]) if args.env_size in os.environ else 1
local_rank = int(
os.environ[args.env_rank]) if args.env_rank in os.environ else 0
if local_rank == 0:
print(vars(args))
if world_size > 1:
print('rank: {}/{}'.format(local_rank + 1, world_size))
torch.distributed.init_process_group(backend='gloo',
init_method='file://%s' %
args.tmpname,
rank=local_rank,
world_size=world_size)
train_dataloader, test_dataloader = load_dataset(args, device, world_size)
net = AutoEncoder(input_dim=1900, nlayers=args.nlayers,
latent=100).to(device)
if world_size > 1:
net = torch.nn.parallel.DistributedDataParallel(net)
if args.modelfile:
net.load_state_dict(torch.load(args.modelfile))
# define our optimizer and loss function
optimizer = torch.optim.Adam(net.parameters(),
lr=args.lr,
weight_decay=args.weight_decay)
loss_func = nn.MSELoss(reduction='mean')
test_losses = []
for epoch in range(args.epochs):
epoch_start = timeit.default_timer()
train(train_dataloader, net, optimizer, loss_func, epoch)
test_loss = test(test_dataloader, net, loss_func)
print(' %5.2f sec' % (timeit.default_timer() - epoch_start))
test_losses.append(test_loss)
if test_loss <= min(test_losses):
torch.save(net.state_dict(), 'model/%5.3f.pth' % min(test_losses))
def main(args):
# ensures that weight initializations are all the same
torch.manual_seed(args.seed)
np.random.seed(args.seed)
torch.cuda.manual_seed(args.seed)
torch.cuda.manual_seed_all(args.seed)
logging = utils.Logger(args.global_rank, args.save)
writer = utils.Writer(args.global_rank, args.save)
# Get data loaders.
train_queue, valid_queue, num_classes, _ = datasets.get_loaders(args)
args.num_total_iter = len(train_queue) * args.epochs
warmup_iters = len(train_queue) * args.warmup_epochs
swa_start = len(train_queue) * (args.epochs - 1)
arch_instance = utils.get_arch_cells(args.arch_instance)
model = AutoEncoder(args, writer, arch_instance)
model = model.cuda()
logging.info('args = %s', args)
logging.info('param size = %fM ', utils.count_parameters_in_M(model))
logging.info('groups per scale: %s, total_groups: %d',
model.groups_per_scale, sum(model.groups_per_scale))
if args.fast_adamax:
# Fast adamax has the same functionality as torch.optim.Adamax, except it is faster.
cnn_optimizer = Adamax(model.parameters(),
args.learning_rate,
weight_decay=args.weight_decay,
eps=1e-3)
else:
cnn_optimizer = torch.optim.Adamax(model.parameters(),
args.learning_rate,
weight_decay=args.weight_decay,
eps=1e-3)
cnn_scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(
cnn_optimizer,
float(args.epochs - args.warmup_epochs - 1),
eta_min=args.learning_rate_min)
grad_scalar = GradScaler(2**10)
num_output = utils.num_output(args.dataset, args)
bpd_coeff = 1. / np.log(2.) / num_output
# if load
checkpoint_file = os.path.join(args.save, 'checkpoint.pt')
if args.cont_training:
logging.info('loading the model.')
checkpoint = torch.load(checkpoint_file, map_location='cpu')
init_epoch = checkpoint['epoch']
model.load_state_dict(checkpoint['state_dict'])
model = model.cuda()
cnn_optimizer.load_state_dict(checkpoint['optimizer'])
grad_scalar.load_state_dict(checkpoint['grad_scalar'])
cnn_scheduler.load_state_dict(checkpoint['scheduler'])
global_step = checkpoint['global_step']
else:
global_step, init_epoch = 0, 0
for epoch in range(init_epoch, args.epochs):
# update lrs.
if args.distributed:
train_queue.sampler.set_epoch(global_step + args.seed)
valid_queue.sampler.set_epoch(0)
if epoch > args.warmup_epochs:
cnn_scheduler.step()
# Logging.
logging.info('epoch %d', epoch)
# Training.
train_nelbo, global_step = train(train_queue, model, cnn_optimizer,
grad_scalar, global_step,
warmup_iters, writer, logging)
logging.info('train_nelbo %f', train_nelbo)
writer.add_scalar('train/nelbo', train_nelbo, global_step)
model.eval()
# generate samples less frequently
eval_freq = 1 if args.epochs <= 50 else 20
if epoch % eval_freq == 0 or epoch == (args.epochs - 1):
with torch.no_grad():
num_samples = 16
n = int(np.floor(np.sqrt(num_samples)))
for t in [0.7, 0.8, 0.9, 1.0]:
logits = model.sample(num_samples, t)
output = model.decoder_output(logits)
output_img = output.mean if isinstance(
output, torch.distributions.bernoulli.Bernoulli
) else output.sample(t)
output_tiled = utils.tile_image(output_img, n)
writer.add_image('generated_%0.1f' % t, output_tiled,
global_step)
valid_neg_log_p, valid_nelbo = test(valid_queue,
model,
num_samples=10,
args=args,
logging=logging)
logging.info('valid_nelbo %f', valid_nelbo)
logging.info('valid neg log p %f', valid_neg_log_p)
logging.info('valid bpd elbo %f', valid_nelbo * bpd_coeff)
logging.info('valid bpd log p %f', valid_neg_log_p * bpd_coeff)
writer.add_scalar('val/neg_log_p', valid_neg_log_p, epoch)
writer.add_scalar('val/nelbo', valid_nelbo, epoch)
writer.add_scalar('val/bpd_log_p', valid_neg_log_p * bpd_coeff,
epoch)
writer.add_scalar('val/bpd_elbo', valid_nelbo * bpd_coeff, epoch)
save_freq = int(np.ceil(args.epochs / 100))
if epoch % save_freq == 0 or epoch == (args.epochs - 1):
if args.global_rank == 0:
logging.info('saving the model.')
torch.save(
{
'epoch': epoch + 1,
'state_dict': model.state_dict(),
'optimizer': cnn_optimizer.state_dict(),
'global_step': global_step,
'args': args,
'arch_instance': arch_instance,
'scheduler': cnn_scheduler.state_dict(),
'grad_scalar': grad_scalar.state_dict()
}, checkpoint_file)
# Final validation
valid_neg_log_p, valid_nelbo = test(valid_queue,
model,
num_samples=1000,
args=args,
logging=logging)
logging.info('final valid nelbo %f', valid_nelbo)
logging.info('final valid neg log p %f', valid_neg_log_p)
writer.add_scalar('val/neg_log_p', valid_neg_log_p, epoch + 1)
writer.add_scalar('val/nelbo', valid_nelbo, epoch + 1)
writer.add_scalar('val/bpd_log_p', valid_neg_log_p * bpd_coeff, epoch + 1)
writer.add_scalar('val/bpd_elbo', valid_nelbo * bpd_coeff, epoch + 1)
writer.close()
def main():
cuda_available = torch.cuda.is_available()
train_params, dataset_params = get_arguments()
net = AutoEncoder()
epoch_trained = 0
if train_params['restore_model']:
net = load_model(net, train_params['restore_dir'],
train_params['restore_model'])
if net is None:
print("Initialize network and train from scratch.")
net = AutoEncoder()
else:
epoch_trained = 0
train_loader, validation = audio_data_loader(**dataset_params)
if cuda_available is False:
warnings.warn(
"Cuda is not avalable, can not train model using multi-gpu.")
if cuda_available:
# Remove train_params["device_ids"] for single GPU
if train_params["device_ids"]:
batch_size = dataset_params["batch_size"]
num_gpu = len(train_params["device_ids"])
assert batch_size % num_gpu == 0
net = nn.DataParallel(net, device_ids=train_params['device_ids'])
torch.backends.cudnn.benchmark = True
net = net.cuda()
criterion = nn.MSELoss()
optimizer = get_optimizer(net, train_params['optimizer'],
train_params['learning_rate'],
train_params['momentum'])
if cuda_available:
criterion = criterion.cuda()
if not os.path.exists(train_params['log_dir']):
os.makedirs(train_params['log_dir'])
if not os.path.exists(train_params['restore_dir']):
os.makedirs(train_params['restore_dir'])
train_loss_log_file = open(train_params['log_dir'] + 'train_loss_log.log',
'a')
test_loss_log_file = open(train_params['log_dir'] + 'test_loss_log.log',
'a')
# Add print for start of training time
time = str(datetime.now())
line = 'Training Started at' + str(time) + ' !!! \n'
train_loss_log_file.writelines(line)
train_loss_log_file.flush()
# Keep track of losses
train_losses = []
eval_losses = []
best_eval = float('inf')
# Begin!
for epoch in range(train_params['num_epochs']):
train(net, criterion, optimizer, train_losses, train_params,
train_loss_log_file, train_loader, cuda_available)
eval_loss = evaluate(net, criterion, epoch, eval_losses, validation,
test_loss_log_file, cuda_available)
if eval_loss < best_eval:
save_model(net, 1, train_params['restore_dir'])
torch.save(net.state_dict(),
train_params['restore_dir'] + 'bestmodel.pth')
best_eval = eval_loss
save_model(net, epoch_trained + epoch + 1, train_params['restore_dir'])
torch.save([train_losses, eval_losses, epoch],
train_params['restore_dir'] + 'data_params')
# Add print for end of training time
time = str(datetime.now())
line = 'Training Ended at' + str(time) + ' !!! \n'
train_loss_log_file.writelines(line)
train_loss_log_file.flush()
train_loss_log_file.close()
test_loss_log_file.close()
shuffle=True)
dataloader_valid = DataLoader(valid_dataset,
batch_size=batch_size,
shuffle=True)
for epoch in range(50):
train_loss = []
valid_loss = []
for data in tqdm(dataloader_train):
img = data[0]
img = img.view(img.shape[0], -1)
output = model(img)
loss = criterion(output, img)
train_loss.append(loss.item())
optimizer.zero_grad()
loss.backward()
optimizer.step()
for data in tqdm(dataloader_valid):
img = data[0]
img = img.view(img.shape[0], -1)
output = model(img)
loss = criterion(output, img)
valid_loss.append(loss.item())
print(f"epoch: {epoch}, Train Loss: {np.mean(train_loss)}")
print(f"epoch: {epoch}, Valid Loss: {np.mean(valid_loss)}")
writer.add_scalar("Train loss", np.mean(train_loss), epoch)
writer.add_scalar("Valid loss", np.mean(valid_loss), epoch)
torch.save(model.state_dict(), './autoencoder.pth')
for i, data in enumerate(val_dataloader, 1):
partial_input, coarse_gt, dense_gt = data
partial_input = partial_input.to(DEVICE)
coarse_gt = coarse_gt.to(DEVICE)
dense_gt = dense_gt.to(DEVICE)
partial_input = partial_input.permute(0, 2, 1)
v, y_coarse, y_detail = network(partial_input)
y_coarse = y_coarse.permute(0, 2, 1)
y_detail = y_detail.permute(0, 2, 1)
loss = loss_d1(coarse_gt, y_coarse) + args.alpha * loss_d2(
dense_gt, y_detail)
total_loss += loss.item()
iter_count += 1
mean_loss = total_loss / iter_count
print("\033[31mValidation epoch {}/{}, loss is {}\033[0m".format(
epoch, args.epochs, mean_loss))
# records the best model and epoch
if mean_loss < minimum_loss:
best_epoch = epoch
minimum_loss = mean_loss
torch.save(network.state_dict(), args.log_dir + '/lowest_loss.pth')
print("\033[31mBest model (lowest loss) in epoch {}\033[0m".format(
best_epoch))
# Load data
data_loader_train = load_data(args.data_dir, args.batch_size)
lowest_loss = float("inf")
history_train_loss = []
try:
for epoch in range(args.epochs):
t0 = time.time()
train_loss = train(model, data_loader_train, args.device)
print("\nTraining Epoch: %d, Train Loss: %.4f, Elapsed: %.1fs" %
(epoch + 1, train_loss, time.time() - t0))
history_train_loss.append(train_loss)
if train_loss < lowest_loss:
torch.save(model.state_dict(), 'weights_unsup.pth')
print("Weight Saved")
lowest_loss = train_loss
exp_lr_scheduler.step(train_loss)
except KeyboardInterrupt:
print('-' * 89)
print('Exiting from training early')
plt.plot(history_train_loss, label='Train Loss')
plt.title('Training Loss')
plt.legend()
plt.show()
def main():
parser = argparse.ArgumentParser(description='AvatarNet by Pytorch')
parser.add_argument('--batch_size',
'-b',
type=int,
default=4,
help='Number of images in each mini-batch')
parser.add_argument('--epoch',
'-e',
type=int,
default=2,
help='Number of sweeps over the dataset to train')
parser.add_argument('--patch_size',
'-p',
type=int,
default=5,
help='Size of extracted patches from style features')
parser.add_argument('--alpha',
'-a',
type=float,
default=0.8,
help='alpha control the fusion degree')
parser.add_argument('--lam1',
type=float,
default=0.01,
help='lambda1 for perceptual loss')
parser.add_argument('--lam2',
type=float,
default=0.01,
help='lambda2 for tv loss')
parser.add_argument('--gpu',
'-g',
type=int,
default=0,
help='GPU ID(nagative value indicate CPU)')
parser.add_argument('--learning_rate',
'-lr',
type=float,
default=1e-4,
help='learning rate for Adam')
parser.add_argument('--snapshot_interval',
type=int,
default=10,
help='Interval of snapshot to generate image')
parser.add_argument('--train_content_dir',
type=str,
default='/data/chen/content',
help='content images directory for train')
parser.add_argument('--train_style_dir',
type=str,
default='/data/chen/style',
help='style images directory for train')
parser.add_argument('--test_content_dir',
type=str,
default='/data/chen/content',
help='content images directory for test')
parser.add_argument('--test_style_dir',
type=str,
default='/data/chen/style',
help='style images directory for test')
parser.add_argument('--save_dir',
type=str,
default='result',
help='save directory for result and loss')
parser.add_argument('--reuse',
default=None,
help='model state path to load for reuse')
args = parser.parse_args()
# create directory to save
if not os.path.exists(args.save_dir):
os.mkdir(args.save_dir)
loss_dir = f'{args.save_dir}/loss'
model_state_dir = f'{args.save_dir}/model_state'
image_dir = f'{args.save_dir}/image'
if not os.path.exists(loss_dir):
os.mkdir(loss_dir)
os.mkdir(model_state_dir)
os.mkdir(image_dir)
# set device on GPU if available, else CPU
if torch.cuda.is_available() and args.gpu >= 0:
device = torch.device(f'cuda:{args.gpu}')
print(f'# CUDA available: {torch.cuda.get_device_name(0)}')
else:
device = 'cpu'
print(f'# Minibatch-size: {args.batch_size}')
print(f'# epoch: {args.epoch}')
print('')
# prepare dataset and dataLoader
train_dataset = PreprocessDataset(args.train_content_dir,
args.train_style_dir)
test_dataset = PreprocessDataset(args.test_content_dir,
args.test_style_dir)
iters = len(train_dataset)
print(f'Length of train image pairs: {iters}')
train_loader = DataLoader(train_dataset,
batch_size=args.batch_size,
shuffle=True)
test_loader = DataLoader(test_dataset,
batch_size=args.batch_size,
shuffle=False)
test_iter = iter(test_loader)
# set model and optimizer
model = AutoEncoder().to(device)
if args.reuse is not None:
model.load_state_dict(torch.load(args.reuse))
optimizer = Adam(model.parameters(), lr=args.learning_rate)
# start training
loss_list = []
for e in range(1, args.epoch + 1):
print(f'Start {e} epoch')
for i, (content, style) in tqdm(enumerate(train_loader, 1)):
content = content.to(device)
style = style.to(device)
loss = model(content, style, args.patch_size, args.alpha,
args.lam1, args.lam2)
loss_list.append(loss.item())
optimizer.zero_grad()
loss.backward()
optimizer.step()
print(
f'[{e}/total {args.epoch} epoch],[{i} /'
f'total {round(iters/args.batch_size)} iteration]: {loss.item()}'
)
if i % args.snapshot_interval == 0:
content, style = next(test_iter)
content = content.to(device)
style = style.to(device)
with torch.no_grad():
out = model.generate(content, style, args.patch_size,
args.alpha)
content = denorm(content, device)
style = denorm(style, device)
out = denorm(out, device)
res = torch.cat([content, style, out], dim=0)
res = res.to('cpu')
save_image(res,
f'{image_dir}/{e}_epoch_{i}_iteration.png',
nrow=args.batch_size)
torch.save(model.state_dict(), f'{model_state_dir}/{e}_epoch.pth')
plt.plot(range(len(loss_list)), loss_list)
plt.xlabel('iteration')
plt.ylabel('loss')
plt.title('train loss')
plt.savefig(f'{loss_dir}/train_loss.png')
with open(f'{loss_dir}/loss_log.txt', 'w') as f:
for l in loss_list:
f.write(f'{l}\n')
print(f'Loss saved in {loss_dir}')
class Trainer(object):
def __init__(self, train_loader, test_loader, config):
self.train_loader = train_loader
self.test_loader = test_loader
self.config = config
self.device = torch.device(
"cuda:0" if torch.cuda.is_available() else "cpu")
self.num_epochs = config.num_epochs
self.lr = config.lr
self.in_channel = config.in_channel
self.image_size = config.image_size
self.hidden_dim = config.hidden_dim
self.output_dim = config.output_dim
self.log_interval = config.log_interval
self.sample_interval = config.sample_interval
self.ckpt_interval = config.ckpt_interval
self.sample_folder = config.sample_folder
self.ckpt_folder = config.ckpt_folder
self.build_net()
self.vis = Visualizer()
def build_net(self):
# define network
self.net = AutoEncoder(self.in_channel, self.image_size,
self.hidden_dim, self.output_dim)
if self.config.mode == 'test' and self.config.training_path == '':
print("[*] Enter model path!")
exit()
# if training model exists
if self.config.training_path != '':
self.net.load_state_dict(
torch.load(self.config.training_path,
map_location=lambda storage, loc: storage))
print("[*] Load weight from {}!".format(self.config.training_path))
self.net.to(self.device)
# add noise to image
def add_noise(self, imgs):
noise = torch.randn(imgs.size()) * 0.4
noisy_imgs = noise + imgs
return noisy_imgs
def train(self):
# define loss function
bce_criterion = nn.BCELoss().to(self.device)
mse_criterion = nn.MSELoss().to(self.device)
# define optimizer
optimizer = Adam(self.net.parameters(), self.lr)
step = 0
print("[*] Learning started!")
# get fixed sample
temp_iter = iter(self.train_loader)
fixed_imgs, _ = next(temp_iter)
fixed_imgs = fixed_imgs.to(self.device)
# save fixed sample image
x_path = os.path.join(self.sample_folder, 'fixed_input.png')
save_image(fixed_imgs, x_path, normalize=True)
print("[*] Save fixed input image!")
# make fixed noisy sample and save
fixed_noisy_imgs = self.add_noise(fixed_imgs)
noisy_x_path = os.path.join(self.sample_folder,
'fixed_noisy_input.png')
save_image(fixed_noisy_imgs, noisy_x_path, normalize=True)
print("[*] Save fixed noisy input image!")
# flatten data tensors
fixed_imgs = fixed_imgs.view(fixed_imgs.size(0), -1)
fixed_noisy_imgs = fixed_noisy_imgs.view(fixed_imgs.size(0), -1)
for epoch in range(self.num_epochs):
for i, (imgs, _) in enumerate(self.train_loader):
self.net.train()
imgs = imgs.view(imgs.size(0), -1) # original images
noisy_imgs = self.add_noise(imgs) # add noise
noisy_imgs = noisy_imgs.to(self.device)
# forwarding
outputs = self.net(noisy_imgs) # use noisy image as input
bce_loss = bce_criterion(outputs, imgs)
mse_loss = mse_criterion(outputs, imgs)
# backwarding
optimizer.zero_grad()
bce_loss.backward() # backward BCE loss
optimizer.step()
# do logging
if (step + 1) % self.log_interval == 0:
print("[{}/{}] [{}/{}] BCE loss: {:3f}, MSE loss:{:3f}".
format(epoch + 1, self.num_epochs, i + 1,
len(self.train_loader),
bce_loss.item() / len(imgs),
mse_loss.item() / len(imgs)))
self.vis.plot("BCE Loss plot", bce_loss.item() / len(imgs))
self.vis.plot("MSE Loss plot", mse_loss.item() / len(imgs))
# do sampling
if (step + 1) % self.sample_interval == 0:
outputs = self.net(fixed_noisy_imgs)
x_hat = outputs.cpu().data.view(outputs.size(0), -1,
self.image_size,
self.image_size)
x_hat_path = os.path.join(
self.sample_folder,
'output_epoch{}.png'.format(epoch + 1))
save_image(x_hat, x_hat_path, normalize=True)
print("[*] Save sample images!")
step += 1
if (epoch + 1) % self.ckpt_interval == 0:
ckpt_path = os.path.join(self.ckpt_folder,
'ckpt_epoch{}.pth'.format(epoch + 1))
torch.save(self.net.state_dict(), ckpt_path)
print("[*] Checkpoint saved!")
print("[*] Learning finished!")
ckpt_path = os.path.join(self.ckpt_folder, 'final_model.pth')
torch.save(self.net.state_dict(), ckpt_path)
print("[*] Final weight saved!")
loss.backward()
optimizer.step()
total_loss += loss.item()
total += 1
pbar.update(1)
train_loss = total_loss / total
network.eval()
total_loss = 0
total = 0
with torch.no_grad():
with tqdm(total=test_gen.get_total_samples() / batch_size) as pbar:
for audios, labels in test_gen.generator():
if np.min(audios) != 0 and np.max(audios) != 0 and np.min(labels) != 0 and np.max(labels) != 0:
audios = audios / 60
labels = labels / 60
audios = torch.from_numpy(audios).float().cuda()
labels = torch.from_numpy(labels).float().cuda()
outputs = network.forward(audios)
loss = criterion(outputs, labels)
total_loss += loss.item()
total += 1
test_loss = total_loss / total
torch.save(network.state_dict(), "model.pt")
print("epoch: ", epoch, "train loss: ", train_loss, "test loss: ", test_loss)
d_loss = dis_loss(real_dis, validity)
optimizer_b.zero_grad()
d_loss.backward(retain_graph=True)
optimizer_b.step()
return _loss
print('training for {} steps'.format(args.n_steps))
for epoch in range(args.n_steps):
# for idx, (images, _) in enumerate(dataloader):
a = next(itera)
b = next(iterb)
images_a = torch.tensor(a, device=device).float()
images_a = images_a.to(device)
images_b = torch.tensor(b, device=device).float()
images_b = images_b.to(device)
loss_a = train_step(images_a, version='a')
loss_b = train_step(images_b, version='b')
to_print = "Epoch[{}/{}] Loss A:{}, Loss B:{}".format(epoch+1, args.n_steps, loss_a.data, loss_b.data)
if epoch % 1000 == 0:
print(to_print)
model_state_dict = model.state_dict()
torch.save(model_state_dict, '{}/{}.pt'.format(args.saved_dir, args.model_name))
if save:
model_state_dict = model.state_dict()
torch.save(model_state_dict, '{}/model.pt'.format(args.saved_dir))
else:
model.load_state_dict(torch.load('{}/model.pt'.format(args.saved_dir)))
def train(self, config):
"""Training routine"""
# Initialize datasets for both training and validation
train_data = torchvision.datasets.ImageFolder(
root=os.path.join(config.data_dir, "train"),
transform=torchvision.transforms.ToTensor())
valid_data = torchvision.datasets.ImageFolder(
root=os.path.join(config.data_dir, "valid"),
transform=torchvision.transforms.ToTensor())
# Create data loader for training and validation.
tr_data_loader = torch.utils.data.DataLoader(
dataset=train_data,
batch_size=config.batch_size,
num_workers=config.numWorker,
shuffle=True)
va_data_loader = torch.utils.data.DataLoader(
dataset=valid_data,
batch_size=config.batch_size,
num_workers=config.numWorker,
shuffle=False)
# Create model instance.
#model = Model()
model = AutoEncoder()
# Move model to gpu if cuda is available
if torch.cuda.is_available():
model = model.cuda()
# Make sure that the model is set for training
model.train()
# Create loss objects
data_loss = nn.MSELoss()
# Create optimizier
optimizer = optim.Adam(model.parameters(), lr=config.learn_rate)
# No need to move the optimizer (as of PyTorch 1.0), it lies in the same
# space as the model
# Create summary writer
tr_writer = SummaryWriter(
log_dir=os.path.join(config.log_dir, "train"))
va_writer = SummaryWriter(
log_dir=os.path.join(config.log_dir, "valid"))
# Create log directory and save directory if it does not exist
if not os.path.exists(config.log_dir):
os.makedirs(config.log_dir)
if not os.path.exists(config.save_dir):
os.makedirs(config.save_dir)
# Initialize training
iter_idx = -1 # make counter start at zero
best_va_acc = 0 # to check if best validation accuracy
# Prepare checkpoint file and model file to save and load from
checkpoint_file = os.path.join(config.save_dir, "checkpoint.pth")
bestmodel_file = os.path.join(config.save_dir, "best_model.pth")
# Check for existing training results. If it existst, and the configuration
# is set to resume `config.resume==True`, resume from previous training. If
# not, delete existing checkpoint.
if os.path.exists(checkpoint_file):
if config.resume:
# Use `torch.load` to load the checkpoint file and the load the
# things that are required to continue training. For the model and
# the optimizer, use `load_state_dict`. It's actually a good idea
# to code the saving part first and then code this part.
print("Checkpoint found! Resuming") # TODO proper logging
# Read checkpoint file.
# Fix gpu -> cpu bug
compute_device = 'cuda' if torch.cuda.is_available() else 'cpu'
load_res = torch.load(checkpoint_file,
map_location=compute_device)
# Resume iterations
iter_idx = load_res["iter_idx"]
# Resume best va result
best_va_acc = load_res["best_va_acc"]
# Resume model
model.load_state_dict(load_res["model"])
# Resume optimizer
optimizer.load_state_dict(load_res["optimizer"])
# Note that we do not resume the epoch, since we will never be able
# to properly recover the shuffling, unless we remember the random
# seed, for example. For simplicity, we will simply ignore this,
# and run `config.num_epoch` epochs regardless of resuming.
else:
os.remove(checkpoint_file)
# Training loop
for epoch in range(config.num_epoch):
# For each iteration
prefix = "Training Epoch {:3d}: ".format(epoch)
for data in tqdm(tr_data_loader, desc=prefix):
# Counter
iter_idx += 1
# Split the data
# x is img, y is label
x, y = data
#print(x)
# Send data to GPU if we have one
if torch.cuda.is_available():
x = x.cuda()
y = y.cuda()
# Apply the model to obtain scores (forward pass)
logits = model.forward(x)
# Compute the loss
loss = data_loss(logits, x.float())
# Compute gradients
loss.backward()
# Update parameters
optimizer.step()
# Zero the parameter gradients in the optimizer
optimizer.zero_grad()
# Monitor results every report interval
if iter_idx % config.rep_intv == 0:
# Compute accuracy (No gradients required). We'll wrapp this
# part so that we prevent torch from computing gradients.
with torch.no_grad():
pred = torch.argmax(logits, dim=1)
acc = torch.mean(
torch.eq(pred.view(x.size()), x).float()) * 100.0
# Write loss and accuracy to tensorboard, using keywords `loss`
# and `accuracy`.
tr_writer.add_scalar("loss", loss, global_step=iter_idx)
tr_writer.add_scalar("accuracy", acc, global_step=iter_idx)
# Save
torch.save(
{
"iter_idx": iter_idx,
"best_va_acc": best_va_acc,
"model": model.state_dict(),
"optimizer": optimizer.state_dict(),
"loss": loss,
"epoch": epoch,
"acc": acc
}, checkpoint_file)
# Validate results every validation interval
if iter_idx % config.val_intv == 0:
# List to contain all losses and accuracies for all the
# training batches
va_loss = []
va_acc = []
# Set model for evaluation
model = model.eval()
for data in va_data_loader:
# Split the data
x, y = data
# Send data to GPU if we have one
if torch.cuda.is_available():
x = x.cuda()
y = y.cuda()
# Apply forward pass to compute the losses
# and accuracies for each of the validation batches
with torch.no_grad():
# Compute logits
logits = model.forward(x)
# Compute loss and store as numpy
loss = data_loss(logits, x.float())
va_loss += [loss.cpu().numpy()]
# Compute accuracy and store as numpy
pred = torch.argmax(logits, dim=1)
acc = torch.mean(
torch.eq(pred.view(x.size()),
x).float()) * 100.0
va_acc += [acc.cpu().numpy()]
# Set model back for training
model = model.train()
# Take average
va_loss = np.mean(va_loss)
va_acc = np.mean(va_acc)
# Write to tensorboard using `va_writer`
va_writer.add_scalar("loss", va_loss, global_step=iter_idx)
va_writer.add_scalar("accuracy",
va_acc,
global_step=iter_idx)
# Check if best accuracy
if va_acc > best_va_acc:
best_va_acc = va_acc
# Save best model using torch.save. Similar to previous
# save but at location defined by `bestmodel_file`
torch.save(
{
"iter_idx": iter_idx,
"best_va_acc": best_va_acc,
"model": model.state_dict(),
"optimizer": optimizer.state_dict(),
"loss": loss,
"acc": acc
}, bestmodel_file)