def val(model, criterion, config, data_config, n_channel, logger, writer, global_step, device):
model.eval()
dataloader_3d = create_loader_3d(data_config, 'val')
val_loss = 0
val_dice_loss = 0
val_attn_loss_dict = {}
n_batch_3d = len(dataloader_3d)
with torch.no_grad():
with tqdm(total=n_batch_3d, desc="Validation execution.", unit='batch') as pbar:
for idx_3d, batch_3d in enumerate(dataloader_3d):
dataloader_2d = create_loader_2d(batch_3d, data_config, 'val')
for idx, batch_2d in enumerate(dataloader_2d):
img = batch_2d['img'].to(device=device, dtype=torch.float32) # [N, n_channel, H, W]
mask_gt = batch_2d['mask'].to(device=device, dtype=torch.float32) # [N, H, W]
mask_flag = batch_2d['mask_flag'].to(device=device, dtype=torch.float32)
attention_map_out = model(img)
loss_attn_map, loss_dict_attn_map = criterion(pred=attention_map_out, target=mask_gt,
target_roi_weight=mask_flag, deep_supervision=True,
need_sigmoid=False,
layer_weight=config['loss']['attention_loss_weight'])
loss = loss_attn_map
loss_scalar = loss.detach().item()
loss_dice_scalar = loss_dict_attn_map['layer_0']["dice_loss"]
val_loss += loss_scalar
val_dice_loss += loss_dice_scalar
for key, value in loss_dict_attn_map.items():
val_attn_loss_dict.setdefault(key, dict())
val_attn_loss_dict[key].setdefault("epoch_attn_loss_dice", 0)
val_attn_loss_dict[key]["epoch_attn_loss_dice"] += value["dice_loss"]
pbar.set_postfix(**{'loss (batch)': loss_scalar, 'loss_dice': loss_dice_scalar})
logger.info(
f"\tBatch: {idx_3d}/{n_batch_3d}, Loss: {loss_scalar}, Dice_loss: {loss_dice_scalar}")
pbar.update()
writer.add_scalar('Loss_val/val', loss_scalar, global_step)
writer.add_scalar('Loss_val/val_dice', loss_dice_scalar, global_step)
for key, value in loss_dict_attn_map.items():
writer.add_scalar(f'Loss_val/val_dice/attention_{key}', value["dice_loss"], global_step)
writer.add_images('val/images', torch.unsqueeze(img[:, n_channel // 2], 1), global_step)
writer.add_images('val/masks_gt', torch.sum(mask_gt[:, :-2], dim=1, keepdim=True), global_step)
for r_i, roi_name in enumerate((data_config['dataset']['3d']['roi_names'] + ["issue", "air"])):
writer.add_images(f'val/masks_{roi_name}_gt', mask_gt[:, r_i:r_i + 1], global_step)
writer.add_images(f'val/masks_{roi_name}_pred', attention_map_out[0][:, r_i:r_i + 1], global_step)
if data_config['dataset']['3d']['with_issue_air_mask']:
writer.add_images('val/masks_pred',
torch.sum(attention_map_out[0][:, :-2], dim=1, keepdim=True), global_step)
else:
writer.add_images('val/masks_pred',
torch.sum(attention_map_out[0], dim=1, keepdim=True), global_step)
for l_i, attn_map_single in enumerate(attention_map_out):
for r_i, roi_name in enumerate(data_config['dataset']['3d']['roi_names'] + ["issue", "air"]):
writer.add_images(f'val/masks_{roi_name}_pred_layer_{l_i}',
attn_map_single[:, r_i:r_i + 1], global_step)
model.train()
return val_loss, val_dice_loss, val_attn_loss_dict
def val(model, criterion, roi_names, data_config, n_channel, logger, writer, global_step, device):
model.eval()
dataloader_3d = create_loader_3d(data_config, 'val')
val_loss = 0
val_dice_loss = 0
n_batch_3d = len(dataloader_3d)
with torch.no_grad():
with tqdm(total=n_batch_3d, desc="Validation execution.", unit='batch') as pbar:
for idx_3d, batch_3d in enumerate(dataloader_3d):
dataloader_2d = create_loader_2d(batch_3d, data_config, 'val')
for idx, batch_2d in enumerate(dataloader_2d):
img = batch_2d['img'].to(device=device, dtype=torch.float32) # [N, n_channel, H, W]
mask_gt = batch_2d['mask'].to(device=device, dtype=torch.float32) # [N, H, W]
mask_flag = batch_2d['mask_flag'].to(device=device, dtype=torch.float32)
out = model(img)
loss, loss_dict = criterion(pred=out, target=mask_gt, target_roi_weight=mask_flag,
need_sigmoid=False, for_val=True)
loss_scalar = loss.detach().item()
loss_dice_scalar = loss_dict["dice_loss"]
val_loss += loss_scalar
val_dice_loss += loss_dice_scalar
pbar.set_postfix(**{'loss (batch)': loss_scalar, 'loss_dice': loss_dice_scalar})
logger.info(f"\tBatch: {idx_3d}/{n_batch_3d}, Loss: {loss_scalar}, Dice_loss: {loss_dice_scalar}")
pbar.update()
writer.add_scalar('Loss_val/val', loss_scalar, global_step)
writer.add_scalar('Loss_val/val_dice', loss_dice_scalar, global_step)
writer.add_images('val/images', torch.unsqueeze(img[:, n_channel // 2], 1), global_step)
for r_i, roi_name in enumerate(roi_names):
writer.add_images(f'val/masks_{roi_name}_gt', mask_gt[:, r_i:r_i + 1], global_step)
writer.add_images(f'val/masks_{roi_name}_pred', out[0][:, r_i:r_i + 1], global_step)
if data_config['dataset']['3d']['with_issue_air_mask']:
writer.add_images('val/masks_gt', torch.sum(mask_gt[:, :-2], dim=1, keepdim=True),
global_step)
writer.add_images('val/masks_pred',
torch.sum(out[0][:, :-2], dim=1, keepdim=True),
global_step)
elif data_config['dataset']['3d']['with_background']:
writer.add_images('val/masks_gt', torch.sum(mask_gt[:, :-1], dim=1, keepdim=True), global_step)
writer.add_images('val/masks_pred',
torch.sum(out[0][:, :-1], dim=1, keepdim=True), global_step)
else:
writer.add_images('val/masks_gt', torch.sum(mask_gt, dim=1, keepdim=True), global_step)
writer.add_images('val/masks_pred',
torch.sum(out[0], dim=1, keepdim=True), global_step)
model.train()
return val_loss, val_dice_loss
def pred_with_model(model, ckpt_dir, ckpt_fn, pred_save_dir, config,
data_config, roi_names, device):
model = load_checkpoint_model(model, ckpt_dir, ckpt_fn, device)
###################################################################################
# Dataset
###################################################################################
dataloader_3d = create_loader_3d(data_config, 'pred')
n_batch_3d = len(dataloader_3d)
with torch.no_grad():
with tqdm(total=n_batch_3d, desc=f"Predicting", unit='batch') as pbar:
for batch_3d in dataloader_3d:
assert len(batch_3d
) == 1, 'len(batch_3d) in pred.py must be set to 1.'
pid = batch_3d[0]['pid']
mask_pred_all = torch.zeros_like(
batch_3d[0]['mask'],
dtype=torch.bool).to(device) # shape -> (N_roi, D, H, W)
dataloader_2d = create_loader_2d(batch_3d, data_config, 'pred')
for idx, batch_2d in enumerate(dataloader_2d):
img = batch_2d['img'].to(
device=device,
dtype=torch.float32) # [N, n_channel, H, W]
target_slice = batch_2d['target_slice'] # shape -> [N]
attention_map_out = model(
img) # shape -> (N, C, H, W), C is N_roi
mask_pred = attention_map_out[0]
mask_pred = torch.transpose(mask_pred, 0,
1) # shape -> (C, N, H, W)
mask_pred_all[:, target_slice] = mask_pred.gt(0.5)
os.makedirs(config['pred_save_dir'], exist_ok=True)
if data_config['dataset']['3d']['with_issue_air_mask']:
roi_names += ["issue", "air"]
for i, roi in enumerate(roi_names):
nrrd.write(
os.path.join(pred_save_dir, f'{pid}_{roi}.nrrd'),
mask_pred_all[i].numpy().astype(np.uint8))
pbar.update()
def main():
parser = argparse.ArgumentParser(description='SegTransformer training')
parser.add_argument('--config', type=str, required=True)
args = parser.parse_args()
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
config = load_config_yaml(args.config)
data_config = load_config_yaml(config['data_config'])
now = datetime.datetime.now()
date_time = now.strftime("%Y-%m-%d-%H-%M")
os.makedirs(config['logging_dir'], exist_ok=True)
logging_path = os.path.join(config['logging_dir'],
f'logging_train_{date_time}.txt')
logger = create_logger(logging_path, stdout=False)
###################################################################################
# construct net
###################################################################################
n_channel = data_config['dataset']['2d']['n_slice']
n_class = len(data_config['dataset']['3d']['roi_names'])
roi_names = data_config['dataset']['3d']['roi_names']
if data_config['dataset']['3d']['with_issue_air_mask']:
n_class += 2
roi_names += ['issue_mask', 'air_mask']
if data_config['dataset']['3d']['with_background']:
n_class += 1
roi_names += ['bg']
start_channel = int(config['start_channel'])
logger.info(
f'create model with n_channel={n_channel}, start_channel={start_channel}, n_class={n_class}'
)
model = SegTransformer(n_channel=n_channel,
start_channel=start_channel,
n_class=n_class,
input_dim=(512, 512),
nhead=4,
normalization='bn',
activation='relu',
num_groups=None,
with_background=data_config['dataset']['3d']
['with_background']).to(device)
logger.info(f"model_dir: {config['ckpt_dir']}")
###################################################################################
# criterion, optimizer, scheduler
###################################################################################
criterion = Criterion(config)
optimizer = torch.optim.AdamW(model.parameters(),
lr=config['lr'],
weight_decay=config['weight_decay'])
scheduler = torch.optim.lr_scheduler.StepLR(optimizer,
step_size=config['step_size'])
if config['deep_supervision']:
logger.info('Train model using deep supervision')
else:
logger.info('Train model using deep supervision')
###################################################################################
# SummaryWriter
###################################################################################
logger.info("Creating writer")
writer = SummaryWriter(comment=f"LR_{config['lr']}_BS_{config['n_epoch']}")
###################################################################################
# train setup
###################################################################################
global_step = 0
best_loss = np.inf
epoch_start = 0
###################################################################################
# load previous model
###################################################################################
if config['load_checkpoint']:
logger.info(
f'Loading model from {os.path.join(config["ckpt_dir"], config["ckpt_fn"])}...'
)
model, optimizer, scheduler, epoch_start, global_step = load_checkpoint(
model, optimizer, scheduler, config['ckpt_dir'], config['ckpt_fn'],
device)
elif config['load_checkpoint_encoder']:
logger.info(
f'Loading encoder from {os.path.join(config["ckpt_dir"], config["ckpt_fn"])}...'
)
model.encoder = load_checkpoint_encoder(model.encoder,
ckpt_dir=config['ckpt_dir'],
ckpt_fn=config['ckpt_fn'],
device=device)
if config['freeze_encoder']:
logger.info('Freeze encoder')
freeze(model.encoder)
elif config['load_checkpoint_decoder']:
logger.info(
f'Loading decoder from {os.path.join(config["ckpt_dir"], config["ckpt_fn"])}...'
)
model.decoder = load_checkpoint_decoder(model.decoder,
ckpt_dir=config['ckpt_dir'],
ckpt_fn=config['ckpt_fn'],
device=device)
if config['freeze_decoder']:
logger.info('Freeze decoder')
freeze(model.decoder)
###################################################################################
# parallel model and data
###################################################################################
if torch.cuda.device_count() > 1:
print("Let's use", torch.cuda.device_count(), "GPUs!")
# dim = 0 [30, xxx] -> [10, ...], [10, ...], [10, ...] on 3 GPUs
model = torch.nn.DataParallel(model)
###################################################################################
# Dataset
###################################################################################
dataloader_3d = create_loader_3d(data_config, 'train')
###################################################################################
# train
###################################################################################
logger.info(f'Starting training from epoch: {epoch_start}')
for epoch in range(epoch_start, config['n_epoch']):
logger.info(f"Epoch: {epoch}/{config['n_epoch']}")
epoch_loss = 0
epoch_loss_dice = 0
epoch_attn_loss_dict = {}
n_batch_3d = len(dataloader_3d)
with tqdm(total=n_batch_3d,
desc=f"Epoch {epoch + 1}/{config['n_epoch']}",
unit='batch') as pbar:
for batch_3d in dataloader_3d:
dataloader_2d = create_loader_2d(batch_3d, data_config,
'train')
n_batch_2d = len(dataloader_2d)
for idx, batch_2d in enumerate(dataloader_2d):
img = batch_2d['img'].to(
device=device,
dtype=torch.float32) # [N, n_channel, H, W]
mask_gt = batch_2d['mask'].to(
device=device, dtype=torch.float32) # [N, H, W]
attention_map_out = model(img)
mask_flag = batch_2d['mask_flag'].to(device=device,
dtype=torch.float32)
loss_attn_map, loss_dict_attn_map = criterion(
pred=attention_map_out,
target=mask_gt,
target_roi_weight=mask_flag,
deep_supervision=True,
need_sigmoid=False,
layer_weight=config['loss']['attention_loss_weight'])
optimizer.zero_grad()
loss = loss_attn_map
loss.backward()
torch.nn.utils.clip_grad_value_(model.parameters(), 0.01)
optimizer.step()
global_step += 1
loss_scalar = loss.detach().item()
loss_dice_scalar = loss_dict_attn_map['layer_0'][
'dice_loss']
epoch_loss += loss_scalar
epoch_loss_dice += loss_dice_scalar
for key, value in loss_dict_attn_map.items():
epoch_attn_loss_dict.setdefault(key, dict())
epoch_attn_loss_dict[key].setdefault(
"epoch_attn_loss_dice", 0)
epoch_attn_loss_dict[key][
"epoch_attn_loss_dice"] += value["dice_loss"]
postfix_dict = {
'loss (batch)': loss_scalar,
'loss_dice': loss_dice_scalar,
'global_step': global_step
}
pbar.set_postfix(**postfix_dict)
if (global_step + 1) % (
config['write_summary_loss_batch_step']) == 0:
postfix_dict.update({
f'loss_attention_{key}': value["dice_loss"]
for key, value in loss_dict_attn_map.items()
})
print(postfix_dict)
logger.info(
f"\tBatch: {idx}/{n_batch_2d}, Loss: {loss_scalar}, Dice_loss: {loss_dice_scalar}"
)
writer.add_scalar('Loss_train/train', loss_scalar,
global_step)
writer.add_scalar('Loss_train/train_dice',
loss_dice_scalar, global_step)
for key, value in loss_dict_attn_map.items():
writer.add_scalar(
f'Loss_train/train_dice/attention_{key}',
value["dice_loss"], global_step)
if (global_step +
1) % (config['write_summary_2d_batch_step']) == 0:
writer.add_images(
'train/images',
torch.unsqueeze(img[:, n_channel // 2], 1),
global_step)
for r_i, roi_name in enumerate(roi_names):
writer.add_images(f'train/masks_{roi_name}_gt',
mask_gt[:, r_i:r_i + 1],
global_step)
writer.add_images(
f'train/masks_{roi_name}_pred',
attention_map_out[0][:,
r_i:r_i + 1], global_step)
if data_config['dataset']['3d']['with_issue_air_mask']:
writer.add_images(
'train/masks_gt',
torch.sum(mask_gt[:, :-2], dim=1,
keepdim=True), global_step)
writer.add_images(
'train/masks_pred',
torch.sum(attention_map_out[0][:, :-2],
dim=1,
keepdim=True), global_step)
elif data_config['dataset']['3d']['with_background']:
writer.add_images(
'train/masks_gt',
torch.sum(mask_gt[:, :-1], dim=1,
keepdim=True), global_step)
writer.add_images(
'train/masks_pred',
torch.sum(attention_map_out[0][:, :-1],
dim=1,
keepdim=True), global_step)
else:
writer.add_images(
'train/masks_gt',
torch.sum(mask_gt, dim=1, keepdim=True),
global_step)
writer.add_images(
'train/masks_pred',
torch.sum(attention_map_out[0],
dim=1,
keepdim=True), global_step)
for l_i, attn_map_single in enumerate(
attention_map_out):
for r_i, roi_name in enumerate(roi_names):
writer.add_images(
f'train/masks_{roi_name}_pred_layer_{l_i}',
attn_map_single[:,
r_i:r_i + 1], global_step)
pbar.update()
scheduler.step()
# log epoch loss
if (epoch + 1) % config['logging_epoch_step'] == 0:
writer.add_scalar('lr', optimizer.param_groups[0]['lr'], epoch)
writer.add_scalar('Loss_epoch_train/train', epoch_loss, epoch)
writer.add_scalar('Loss_epoch_train/train_dice',
epoch_loss_dice, epoch)
for key, value in epoch_attn_loss_dict.items():
writer.add_scalar(
f'Loss_epoch_train/train_dice/attention_{key}',
value["epoch_attn_loss_dice"], epoch)
logger.info(
f"Epoch: {epoch}/{config['n_epoch']}, Train Loss: {epoch_loss}, Train Loss DSC: {epoch_loss_dice}"
)
os.makedirs(config['ckpt_dir'], exist_ok=True)
save_checkpoint(model=model,
optimizer=optimizer,
scheduler=scheduler,
epoch=epoch,
global_step=global_step,
ckpt_dir=config['ckpt_dir'],
ckpt_fn=f'ckpt_{date_time}_Epoch_{epoch}.ckpt')
# validation and save model
if (epoch + 1) % config['val_model_epoch_step'] == 0:
val_loss, val_dice_loss, val_attn_loss_dict = val(
model, criterion, config, roi_names, data_config,
n_channel, logger, writer, global_step, device)
writer.add_scalar('Loss_epoch_val/val', val_loss, epoch)
writer.add_scalar('Loss_epoch_val/val_dice', val_dice_loss,
epoch)
for key, value in val_attn_loss_dict.items():
writer.add_scalar(
f'Loss_epoch_val/val_dice/attention_{key}',
value["epoch_attn_loss_dice"], epoch)
logger.info(
f"Epoch: {epoch}/{config['n_epoch']}, Validation Loss: {val_loss}, Validation Loss Dice: {val_dice_loss}"
)
if best_loss > val_dice_loss:
best_loss = val_dice_loss
for filename in glob.glob(
os.path.join(config['ckpt_dir'], "best_ckpt*")):
os.remove(filename)
save_checkpoint(
model=model,
optimizer=optimizer,
scheduler=scheduler,
epoch=epoch,
global_step=global_step,
ckpt_dir=config['ckpt_dir'],
ckpt_fn=f'best_ckpt_{date_time}_epoch_{epoch}.ckpt')
if config['freeze_encoder'] and config[
'unfreeze_encoder_epoch'] is not None:
if epoch >= int(config['unfreeze_encoder_epoch']):
unfreeze(model.module.encoder)
config['unfreeze_encoder_epoch'] = None
logger.info(f'Unfreeze encoder at {epoch}')
if config['freeze_decoder'] and config[
'unfreeze_decoder_epoch'] is not None:
if epoch >= int(config['unfreeze_decoder_epoch']):
unfreeze(model.module.decoder)
config['unfreeze_decoder_epoch'] = None
logger.info(f'Unfreeze decoder at {epoch}')
writer.close()
def main():
parser = argparse.ArgumentParser(description='SegTransformer training')
parser.add_argument('--config', type=str, required=True)
args = parser.parse_args()
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
config = load_config_yaml(args.config)
data_config = load_config_yaml(config['data_config'])
now = datetime.datetime.now()
date_time = now.strftime("%Y-%m-%d-%H-%M")
os.makedirs(config['logging_dir'], exist_ok=True)
logging_path = os.path.join(config['logging_dir'],
f'logging_train_{date_time}.txt')
logger = create_logger(logging_path, stdout=False)
###################################################################################
# construct net
###################################################################################
n_channel = data_config['dataset']['2d']['n_slice']
n_class = len(data_config['dataset']['3d']['roi_names'])
if data_config['dataset']['3d']['with_issue_air_mask']:
n_class += 2
start_channel = int(config['start_channel'])
logger.info(
f'create model with n_channel={n_channel}, start_channel={start_channel}, n_class={n_class}'
)
model = SegTransformer(
n_channel=n_channel,
start_channel=start_channel,
n_class=n_class,
deep_supervision=config["deep_supervision"]).to(device)
logger.info(f"model_dir: {config['ckpt_dir']}")
###################################################################################
# criterion, optimizer, scheduler
###################################################################################
criterion = Criterion(config)
optimizer = torch.optim.AdamW(model.parameters(),
lr=config['lr'],
weight_decay=config['weight_decay'])
scheduler = torch.optim.lr_scheduler.StepLR(optimizer,
step_size=config['step_size'])
if config['deep_supervision']:
logger.info('Train model using deep supervision')
else:
logger.info('Train model using deep supervision')
###################################################################################
# SummaryWriter
###################################################################################
logger.info("Creating writer")
writer = SummaryWriter(comment=f"LR_{config['lr']}_BS_{config['n_epoch']}")
###################################################################################
# train setup
###################################################################################
global_step = 0
best_loss = np.inf
epoch_start = 0
###################################################################################
# load previous model
###################################################################################
if config['load_checkpoint']:
logger.info(
f'Loading model from {os.path.join(config["ckpt_dir"], config["ckpt_fn"])}...'
)
model, optimizer, scheduler, epoch_start, global_step = load_checkpoint(
model, optimizer, scheduler, config['ckpt_dir'], config['ckpt_fn'],
device)
elif config['load_checkpoint_encoder']:
logger.info(
f'Loading encoder from {os.path.join(config["ckpt_dir"], config["ckpt_fn"])}...'
)
model.encoder = load_checkpoint_encoder(model.encoder,
ckpt_dir=config['ckpt_dir'],
ckpt_fn=config['ckpt_fn'],
device=device)
if config['freeze_encoder']:
logger.info('Freeze encoder')
freeze(model.encoder)
elif config['load_checkpoint_decoder']:
logger.info(
f'Loading decoder from {os.path.join(config["ckpt_dir"], config["ckpt_fn"])}...'
)
model.decoder = load_checkpoint_decoder(model.decoder,
ckpt_dir=config['ckpt_dir'],
ckpt_fn=config['ckpt_fn'],
device=device)
if config['freeze_decoder']:
logger.info('Freeze decoder')
freeze(model.decoder)
###################################################################################
# parallel model and data
###################################################################################
if torch.cuda.device_count() > 1:
print("Let's use", torch.cuda.device_count(), "GPUs!")
# dim = 0 [30, xxx] -> [10, ...], [10, ...], [10, ...] on 3 GPUs
model = torch.nn.DataParallel(model)
###################################################################################
# Dataset
###################################################################################
dataloader_3d = create_loader_3d(data_config, 'train')
###################################################################################
# train
###################################################################################
logger.info(f'Starting training from epoch: {epoch_start}')
for epoch in range(epoch_start, config['n_epoch']):
logger.info(f"Epoch: {epoch}/{config['n_epoch']}")
epoch_loss = 0
epoch_loss_focal = 0
epoch_loss_dice = 0
n_batch_3d = len(dataloader_3d)
with tqdm(total=n_batch_3d,
desc=f"Epoch {epoch + 1}/{config['n_epoch']}",
unit='batch') as pbar:
for batch_3d in dataloader_3d:
dataloader_2d = create_loader_2d(batch_3d, data_config,
'train')
n_batch_2d = len(dataloader_2d)
for idx, batch_2d in enumerate(dataloader_2d):
img = batch_2d['img'].to(
device=device,
dtype=torch.float32) # [N, n_channel, H, W]
mask_gt = batch_2d['mask'].to(
device=device, dtype=torch.float32) # [N, H, W]
mask_pred = model(img)
mask_flag = batch_2d['mask_flag'].to(device=device,
dtype=torch.float32)
loss, loss_dict = criterion(pred=mask_pred,
target=mask_gt,
target_roi_weight=mask_flag)
optimizer.zero_grad()
loss.backward()
torch.nn.utils.clip_grad_value_(model.parameters(), 0.01)
optimizer.step()
global_step += 1
loss_scalar = loss_dict["loss"]
loss_focal_scalar = loss_dict["focal_loss"]
loss_dice_scalar = loss_dict["dice_loss"]
epoch_loss += loss_scalar
epoch_loss_focal += loss_focal_scalar
epoch_loss_dice += loss_dice_scalar
pbar.set_postfix(
**{
'loss (batch)': loss_scalar,
'loss_focal': loss_focal_scalar,
'loss_dice': loss_dice_scalar,
'global_step': global_step
})
if (global_step + 1) % (
config['write_summary_loss_batch_step']) == 0:
logger.info(
f"\tBatch: {idx}/{n_batch_2d}, Loss: {loss_scalar}, Focal_loss: {loss_focal_scalar}, Dice_loss: {loss_dice_scalar}"
)
writer.add_scalar('Loss/train', loss_scalar,
global_step)
writer.add_scalar('Loss/train_focal',
loss_focal_scalar, global_step)
writer.add_scalar('Loss/train_dice', loss_dice_scalar,
global_step)
if (global_step +
1) % (config['write_summary_2d_batch_step']) == 0:
writer.add_images(
'train/images',
torch.unsqueeze(img[:, n_channel // 2], 1),
global_step)
writer.add_images(
'train/gt_masks',
torch.sum(mask_gt, dim=1, keepdim=True),
global_step)
writer.add_images(
'train/pred_masks',
torch.sum(mask_pred[0] > 0, dim=1, keepdim=True) >=
1, global_step)
writer.add_images(
'train/pred_masks_raw',
torch.sum(mask_pred[0], dim=1, keepdim=True),
global_step)
pbar.update()
scheduler.step()
# log epoch loss
if (epoch + 1) % config['logging_epoch_step'] == 0:
writer.add_scalar('lr', optimizer.param_groups[0]['lr'], epoch)
writer.add_scalar('Loss_epoch/train', epoch_loss, epoch)
writer.add_scalar('Loss_epoch/train_focal', epoch_loss_focal,
epoch)
writer.add_scalar('Loss_epoch/train_dice', epoch_loss_dice,
epoch)
logger.info(
f"Epoch: {epoch}/{config['n_epoch']}, Train Loss: {epoch_loss}, Train Loss BCE: {epoch_loss_focal}, Train Loss DSC: {epoch_loss_dice}"
)
# validation and save model
if (epoch + 1) % config['val_model_epoch_step'] == 0:
val_loss, val_focal_loss, val_dice_loss = val(
model, criterion, data_config, n_channel, logger, writer,
global_step, device)
writer.add_scalar('Loss_epoch/val', val_loss, epoch)
writer.add_scalar('Loss_epoch/val_focal', val_focal_loss,
epoch)
writer.add_scalar('Loss_epoch/val_dice', val_dice_loss, epoch)
logger.info(
f"Epoch: {epoch}/{config['n_epoch']}, Validation Loss: {val_loss}, Validation Loss Focal: {val_focal_loss}, Validation Loss Dice: {val_dice_loss}"
)
os.makedirs(config['ckpt_dir'], exist_ok=True)
save_checkpoint(model=model,
optimizer=optimizer,
scheduler=scheduler,
epoch=epoch,
global_step=global_step,
ckpt_dir=config['ckpt_dir'],
ckpt_fn=f'ckpt_{date_time}_Epoch_{epoch}.ckpt')
if best_loss > val_loss:
best_loss = val_loss
for filename in glob.glob(
os.path.join(config['ckpt_dir'], "best_ckpt*")):
os.remove(filename)
save_checkpoint(
model=model,
optimizer=optimizer,
scheduler=scheduler,
epoch=epoch,
global_step=global_step,
ckpt_dir=config['ckpt_dir'],
ckpt_fn=f'best_ckpt_{date_time}_epoch_{epoch}.ckpt')
if config['freeze_encoder'] and config[
'unfreeze_encoder_epoch'] is not None:
if epoch >= int(config['unfreeze_encoder_epoch']):
unfreeze(model.module.encoder)
config['unfreeze_encoder_epoch'] = None
logger.info(f'Unfreeze encoder at {epoch}')
if config['freeze_decoder'] and config[
'unfreeze_decoder_epoch'] is not None:
if epoch >= int(config['unfreeze_decoder_epoch']):
unfreeze(model.module.decoder)
config['unfreeze_decoder_epoch'] = None
logger.info(f'Unfreeze decoder at {epoch}')
writer.close()
def val(model, criterion, data_config, n_channel, logger, writer, global_step,
device):
model.eval()
dataloader_3d = create_loader_3d(data_config, 'val')
val_loss = 0
val_focal_loss = 0
val_dice_loss = 0
n_batch_3d = len(dataloader_3d)
with torch.no_grad():
with tqdm(total=n_batch_3d, desc="Validation execution.",
unit='batch') as pbar:
for idx_3d, batch_3d in enumerate(dataloader_3d):
dataloader_2d = create_loader_2d(batch_3d, data_config, 'val')
for idx, batch_2d in enumerate(dataloader_2d):
img = batch_2d['img'].to(
device=device,
dtype=torch.float32) # [N, n_channel, H, W]
mask_gt = batch_2d['mask'].to(
device=device, dtype=torch.float32) # [N, H, W]
mask_flag = batch_2d['mask_flag'].to(device=device,
dtype=torch.float32)
mask_pred = model(img)
loss, loss_dict = criterion(pred=mask_pred,
target=mask_gt,
target_roi_weight=mask_flag)
loss_scalar = loss.item()
loss_focal_scalar = loss_dict["focal_loss"]
loss_dice_scalar = loss_dict["dice_loss"]
val_loss += loss_dict["loss"]
val_focal_loss += loss_focal_scalar
val_dice_loss += loss_dice_scalar
pbar.set_postfix(
**{
'loss (batch)': loss_scalar,
'loss_focal': loss_focal_scalar,
'loss_dice': loss_dice_scalar
})
logger.info(
f"\tBatch: {idx_3d}/{n_batch_3d}, Loss: {loss_scalar}, Focal_loss: {loss_focal_scalar}, Dice_loss: {loss_dice_scalar}"
)
pbar.update()
writer.add_scalar('Loss/val', loss_scalar, global_step)
writer.add_scalar('Loss/val_focal', loss_focal_scalar, global_step)
writer.add_scalar('Loss/val_dice', loss_dice_scalar, global_step)
writer.add_images('val/images',
torch.unsqueeze(img[:, n_channel // 2], 1),
global_step)
writer.add_images('val/gt_masks',
torch.sum(mask_gt, dim=1, keepdim=True),
global_step)
writer.add_images(
'val/pred_masks',
torch.sum(mask_pred[0] > 0, dim=1, keepdim=True) >= 1,
global_step)
writer.add_images('val/pred_masks_raw',
torch.sum(mask_pred[0], dim=1, keepdim=True),
global_step)
model.train()
return val_loss, val_focal_loss, val_dice_loss