def train(args, snapshot_path):
base_lr = args.base_lr
train_data_path = args.root_path
batch_size = args.batch_size
max_iterations = args.max_iterations
num_classes = 2
def create_model(ema=False):
# Network definition
net = net_factory_3d(net_type=args.model,
in_chns=1,
class_num=num_classes)
model = net.cuda()
if ema:
for param in model.parameters():
param.detach_()
return model
model = create_model()
ema_model = create_model(ema=True)
db_train = BraTS2019(base_dir=train_data_path,
split='train',
num=None,
transform=transforms.Compose([
RandomRotFlip(),
RandomCrop(args.patch_size),
ToTensor(),
]))
def worker_init_fn(worker_id):
random.seed(args.seed + worker_id)
labeled_idxs = list(range(0, args.labeled_num))
unlabeled_idxs = list(range(args.labeled_num, 250))
batch_sampler = TwoStreamBatchSampler(labeled_idxs, unlabeled_idxs,
batch_size,
batch_size - args.labeled_bs)
trainloader = DataLoader(db_train,
batch_sampler=batch_sampler,
num_workers=4,
pin_memory=True,
worker_init_fn=worker_init_fn)
model.train()
ema_model.train()
optimizer = optim.SGD(model.parameters(),
lr=base_lr,
momentum=0.9,
weight_decay=0.0001)
ce_loss = CrossEntropyLoss()
dice_loss = losses.DiceLoss(2)
writer = SummaryWriter(snapshot_path + '/log')
logging.info("{} iterations per epoch".format(len(trainloader)))
iter_num = 0
max_epoch = max_iterations // len(trainloader) + 1
best_performance = 0.0
iterator = tqdm(range(max_epoch), ncols=70)
for epoch_num in iterator:
for i_batch, sampled_batch in enumerate(trainloader):
volume_batch, label_batch = sampled_batch['image'], sampled_batch[
'label']
volume_batch, label_batch = volume_batch.cuda(), label_batch.cuda()
unlabeled_volume_batch = volume_batch[args.labeled_bs:]
noise = torch.clamp(
torch.randn_like(unlabeled_volume_batch) * 0.1, -0.2, 0.2)
ema_inputs = unlabeled_volume_batch + noise
outputs = model(volume_batch)
outputs_soft = torch.softmax(outputs, dim=1)
with torch.no_grad():
ema_output = ema_model(ema_inputs)
T = 8
_, _, d, w, h = unlabeled_volume_batch.shape
volume_batch_r = unlabeled_volume_batch.repeat(2, 1, 1, 1, 1)
stride = volume_batch_r.shape[0] // 2
preds = torch.zeros([stride * T, 2, d, w, h]).cuda()
for i in range(T // 2):
ema_inputs = volume_batch_r + \
torch.clamp(torch.randn_like(
volume_batch_r) * 0.1, -0.2, 0.2)
with torch.no_grad():
preds[2 * stride * i:2 * stride *
(i + 1)] = ema_model(ema_inputs)
preds = torch.softmax(preds, dim=1)
preds = preds.reshape(T, stride, 2, d, w, h)
preds = torch.mean(preds, dim=0)
uncertainty = -1.0 * \
torch.sum(preds*torch.log(preds + 1e-6), dim=1, keepdim=True)
loss_ce = ce_loss(outputs[:args.labeled_bs],
label_batch[:args.labeled_bs])
loss_dice = dice_loss(outputs_soft[:args.labeled_bs],
label_batch[:args.labeled_bs].unsqueeze(1))
supervised_loss = 0.5 * (loss_dice + loss_ce)
consistency_weight = get_current_consistency_weight(iter_num //
150)
consistency_dist = losses.softmax_mse_loss(
outputs[args.labeled_bs:],
ema_output) # (batch, 2, 112,112,80)
threshold = (0.75 + 0.25 * ramps.sigmoid_rampup(
iter_num, max_iterations)) * np.log(2)
mask = (uncertainty < threshold).float()
consistency_loss = torch.sum(
mask * consistency_dist) / (2 * torch.sum(mask) + 1e-16)
loss = supervised_loss + consistency_weight * consistency_loss
optimizer.zero_grad()
loss.backward()
optimizer.step()
update_ema_variables(model, ema_model, args.ema_decay, iter_num)
lr_ = base_lr * (1.0 - iter_num / max_iterations)**0.9
for param_group in optimizer.param_groups:
param_group['lr'] = lr_
iter_num = iter_num + 1
writer.add_scalar('info/lr', lr_, iter_num)
writer.add_scalar('info/total_loss', loss, iter_num)
writer.add_scalar('info/loss_ce', loss_ce, iter_num)
writer.add_scalar('info/loss_dice', loss_dice, iter_num)
writer.add_scalar('info/consistency_loss', consistency_loss,
iter_num)
writer.add_scalar('info/consistency_weight', consistency_weight,
iter_num)
logging.info(
'iteration %d : loss : %f, loss_ce: %f, loss_dice: %f' %
(iter_num, loss.item(), loss_ce.item(), loss_dice.item()))
writer.add_scalar('loss/loss', loss, iter_num)
if iter_num % 20 == 0:
image = volume_batch[0, 0:1, :, :,
20:61:10].permute(3, 0, 1,
2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=True)
writer.add_image('train/Image', grid_image, iter_num)
image = outputs_soft[0, 1:2, :, :,
20:61:10].permute(3, 0, 1,
2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=False)
writer.add_image('train/Predicted_label', grid_image, iter_num)
image = label_batch[0, :, :, 20:61:10].unsqueeze(0).permute(
3, 0, 1, 2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=False)
writer.add_image('train/Groundtruth_label', grid_image,
iter_num)
if iter_num > 0 and iter_num % 200 == 0:
model.eval()
avg_metric = test_all_case(model,
args.root_path,
test_list="val.txt",
num_classes=2,
patch_size=args.patch_size,
stride_xy=64,
stride_z=64)
if avg_metric[:, 0].mean() > best_performance:
best_performance = avg_metric[:, 0].mean()
save_mode_path = os.path.join(
snapshot_path, 'iter_{}_dice_{}.pth'.format(
iter_num, round(best_performance, 4)))
save_best = os.path.join(
snapshot_path, '{}_best_model.pth'.format(args.model))
torch.save(model.state_dict(), save_mode_path)
torch.save(model.state_dict(), save_best)
writer.add_scalar('info/val_dice_score', avg_metric[0, 0],
iter_num)
writer.add_scalar('info/val_hd95', avg_metric[0, 1], iter_num)
logging.info('iteration %d : dice_score : %f hd95 : %f' %
(iter_num, avg_metric[0, 0].mean(),
avg_metric[0, 1].mean()))
model.train()
if iter_num % 3000 == 0:
save_mode_path = os.path.join(snapshot_path,
'iter_' + str(iter_num) + '.pth')
torch.save(model.state_dict(), save_mode_path)
logging.info("save model to {}".format(save_mode_path))
if iter_num >= max_iterations:
break
if iter_num >= max_iterations:
iterator.close()
break
writer.close()
return "Training Finished!"
def train(args, snapshot_path):
base_lr = args.base_lr
train_data_path = args.root_path
batch_size = args.batch_size
max_iterations = args.max_iterations
num_classes = 2
def create_model(ema=False):
# Network definition
net = net_factory_3d(net_type=args.model,
in_chns=1,
class_num=num_classes)
model = net.cuda()
if ema:
for param in model.parameters():
param.detach_()
return model
model = create_model()
ema_model = create_model(ema=True)
db_train = BraTS2019(base_dir=train_data_path,
split='train',
num=None,
transform=transforms.Compose([
RandomRotFlip(),
RandomCrop(args.patch_size),
ToTensor(),
]))
def worker_init_fn(worker_id):
random.seed(args.seed + worker_id)
labeled_idxs = list(range(0, args.labeled_num))
unlabeled_idxs = list(range(args.labeled_num, args.total_labeled_num))
batch_sampler = TwoStreamBatchSampler(labeled_idxs, unlabeled_idxs,
batch_size,
batch_size - args.labeled_bs)
trainloader = DataLoader(db_train,
batch_sampler=batch_sampler,
num_workers=4,
pin_memory=True,
worker_init_fn=worker_init_fn)
model.train()
ema_model.train()
optimizer = optim.SGD(model.parameters(),
lr=base_lr,
momentum=0.9,
weight_decay=0.0001)
ce_loss = CrossEntropyLoss()
dice_loss = losses.DiceLoss(2)
writer = SummaryWriter(snapshot_path + '/log')
logging.info("{} iterations per epoch".format(len(trainloader)))
iter_num = 0
max_epoch = max_iterations // len(trainloader) + 1
best_performance = 0.0
iterator = tqdm(range(max_epoch), ncols=70)
for epoch_num in iterator:
for i_batch, sampled_batch in enumerate(trainloader):
volume_batch, label_batch = sampled_batch['image'], sampled_batch[
'label']
volume_batch, label_batch = volume_batch.cuda(), label_batch.cuda()
labeled_volume_batch = volume_batch[:args.labeled_bs]
unlabeled_volume_batch = volume_batch[args.labeled_bs:]
# ICT mix factors
ict_mix_factors = np.random.beta(args.ict_alpha,
args.ict_alpha,
size=(args.labeled_bs // 2, 1, 1,
1, 1))
ict_mix_factors = torch.tensor(ict_mix_factors,
dtype=torch.float).cuda()
unlabeled_volume_batch_0 = unlabeled_volume_batch[0:1, ...]
unlabeled_volume_batch_1 = unlabeled_volume_batch[1:2, ...]
# Mix images
batch_ux_mixed = unlabeled_volume_batch_0 * \
(1.0 - ict_mix_factors) + \
unlabeled_volume_batch_1 * ict_mix_factors
input_volume_batch = torch.cat(
[labeled_volume_batch, batch_ux_mixed], dim=0)
outputs = model(input_volume_batch)
outputs_soft = torch.softmax(outputs, dim=1)
with torch.no_grad():
ema_output_ux0 = torch.softmax(
ema_model(unlabeled_volume_batch_0), dim=1)
ema_output_ux1 = torch.softmax(
ema_model(unlabeled_volume_batch_1), dim=1)
batch_pred_mixed = ema_output_ux0 * \
(1.0 - ict_mix_factors) + ema_output_ux1 * ict_mix_factors
loss_ce = ce_loss(outputs[:args.labeled_bs],
label_batch[:args.labeled_bs][:])
loss_dice = dice_loss(outputs_soft[:args.labeled_bs],
label_batch[:args.labeled_bs].unsqueeze(1))
supervised_loss = 0.5 * (loss_dice + loss_ce)
consistency_weight = get_current_consistency_weight(iter_num //
150)
consistency_loss = torch.mean(
(outputs_soft[args.labeled_bs:] - batch_pred_mixed)**2)
loss = supervised_loss + consistency_weight * consistency_loss
optimizer.zero_grad()
loss.backward()
optimizer.step()
update_ema_variables(model, ema_model, args.ema_decay, iter_num)
lr_ = base_lr * (1.0 - iter_num / max_iterations)**0.9
for param_group in optimizer.param_groups:
param_group['lr'] = lr_
iter_num = iter_num + 1
writer.add_scalar('info/lr', lr_, iter_num)
writer.add_scalar('info/total_loss', loss, iter_num)
writer.add_scalar('info/loss_ce', loss_ce, iter_num)
writer.add_scalar('info/loss_dice', loss_dice, iter_num)
writer.add_scalar('info/consistency_loss', consistency_loss,
iter_num)
writer.add_scalar('info/consistency_weight', consistency_weight,
iter_num)
logging.info(
'iteration %d : loss : %f, loss_ce: %f, loss_dice: %f' %
(iter_num, loss.item(), loss_ce.item(), loss_dice.item()))
writer.add_scalar('loss/loss', loss, iter_num)
if iter_num % 20 == 0:
image = volume_batch[0, 0:1, :, :,
20:61:10].permute(3, 0, 1,
2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=True)
writer.add_image('train/Image', grid_image, iter_num)
image = outputs_soft[0, 1:2, :, :,
20:61:10].permute(3, 0, 1,
2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=False)
writer.add_image('train/Predicted_label', grid_image, iter_num)
image = label_batch[0, :, :, 20:61:10].unsqueeze(0).permute(
3, 0, 1, 2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=False)
writer.add_image('train/Groundtruth_label', grid_image,
iter_num)
if iter_num > 0 and iter_num % 200 == 0:
model.eval()
avg_metric = test_all_case(model,
args.root_path,
test_list="val.txt",
num_classes=2,
patch_size=args.patch_size,
stride_xy=32,
stride_z=32)
if avg_metric[:, 0].mean() > best_performance:
best_performance = avg_metric[:, 0].mean()
save_mode_path = os.path.join(
snapshot_path, 'iter_{}_dice_{}.pth'.format(
iter_num, round(best_performance, 4)))
save_best = os.path.join(
snapshot_path, '{}_best_model.pth'.format(args.model))
torch.save(model.state_dict(), save_mode_path)
torch.save(model.state_dict(), save_best)
writer.add_scalar('info/val_dice_score', avg_metric[0, 0],
iter_num)
writer.add_scalar('info/val_hd95', avg_metric[0, 1], iter_num)
logging.info('iteration %d : dice_score : %f hd95 : %f' %
(iter_num, avg_metric[0, 0].mean(),
avg_metric[0, 1].mean()))
model.train()
if iter_num % 3000 == 0:
save_mode_path = os.path.join(snapshot_path,
'iter_' + str(iter_num) + '.pth')
torch.save(model.state_dict(), save_mode_path)
logging.info("save model to {}".format(save_mode_path))
if iter_num >= max_iterations:
break
if iter_num >= max_iterations:
iterator.close()
break
writer.close()
return "Training Finished!"
def train(args, snapshot_path):
num_classes = 2
base_lr = args.base_lr
train_data_path = args.root_path
batch_size = args.batch_size
max_iterations = args.max_iterations
net = unet_3D(n_classes=num_classes, in_channels=1)
model = net.cuda()
DAN = FC3DDiscriminator(num_classes=num_classes)
DAN = DAN.cuda()
db_train = BraTS2019(base_dir=train_data_path,
split='train',
num=None,
transform=transforms.Compose([
RandomRotFlip(),
RandomCrop(args.patch_size),
ToTensor(),
]))
def worker_init_fn(worker_id):
random.seed(args.seed + worker_id)
labeled_idxs = list(range(0, args.labeled_num))
unlabeled_idxs = list(range(args.labeled_num, 250))
batch_sampler = TwoStreamBatchSampler(labeled_idxs, unlabeled_idxs,
batch_size,
batch_size - args.labeled_bs)
trainloader = DataLoader(db_train,
batch_sampler=batch_sampler,
num_workers=4,
pin_memory=True,
worker_init_fn=worker_init_fn)
model.train()
optimizer = optim.SGD(model.parameters(),
lr=base_lr,
momentum=0.9,
weight_decay=0.0001)
DAN_optimizer = optim.Adam(DAN.parameters(),
lr=args.DAN_lr,
betas=(0.9, 0.99))
ce_loss = CrossEntropyLoss()
dice_loss = losses.DiceLoss(2)
writer = SummaryWriter(snapshot_path + '/log')
logging.info("{} iterations per epoch".format(len(trainloader)))
iter_num = 0
max_epoch = max_iterations // len(trainloader) + 1
best_performance = 0.0
iterator = tqdm(range(max_epoch), ncols=70)
for epoch_num in iterator:
for i_batch, sampled_batch in enumerate(trainloader):
volume_batch, label_batch = sampled_batch['image'], sampled_batch[
'label']
volume_batch, label_batch = volume_batch.cuda(), label_batch.cuda()
DAN_target = torch.tensor([1, 1, 0, 0]).cuda()
model.train()
DAN.eval()
outputs = model(volume_batch)
outputs_soft = torch.softmax(outputs, dim=1)
loss_ce = ce_loss(outputs[:args.labeled_bs],
label_batch[:args.labeled_bs][:])
loss_dice = dice_loss(outputs_soft[:args.labeled_bs],
label_batch[:args.labeled_bs].unsqueeze(1))
supervised_loss = 0.5 * (loss_dice + loss_ce)
consistency_weight = get_current_consistency_weight(iter_num //
150)
DAN_outputs = DAN(outputs_soft[args.labeled_bs:],
volume_batch[args.labeled_bs:])
consistency_loss = F.cross_entropy(
DAN_outputs, (DAN_target[:args.labeled_bs]).long())
loss = supervised_loss + consistency_weight * consistency_loss
optimizer.zero_grad()
loss.backward()
optimizer.step()
model.eval()
DAN.train()
with torch.no_grad():
outputs = model(volume_batch)
outputs_soft = torch.softmax(outputs, dim=1)
DAN_outputs = DAN(outputs_soft, volume_batch)
DAN_loss = F.cross_entropy(DAN_outputs, DAN_target.long())
DAN_optimizer.zero_grad()
DAN_loss.backward()
DAN_optimizer.step()
lr_ = base_lr * (1.0 - iter_num / max_iterations)**0.9
for param_group in optimizer.param_groups:
param_group['lr'] = lr_
iter_num = iter_num + 1
writer.add_scalar('info/lr', lr_, iter_num)
writer.add_scalar('info/total_loss', loss, iter_num)
writer.add_scalar('info/loss_ce', loss_ce, iter_num)
writer.add_scalar('info/loss_dice', loss_dice, iter_num)
writer.add_scalar('info/consistency_loss', consistency_loss,
iter_num)
writer.add_scalar('info/consistency_weight', consistency_weight,
iter_num)
logging.info(
'iteration %d : loss : %f, loss_ce: %f, loss_dice: %f' %
(iter_num, loss.item(), loss_ce.item(), loss_dice.item()))
if iter_num % 20 == 0:
image = volume_batch[0, 0:1, :, :,
20:61:10].permute(3, 0, 1,
2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=True)
writer.add_image('train/Image', grid_image, iter_num)
image = outputs_soft[0, 1:2, :, :,
20:61:10].permute(3, 0, 1,
2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=False)
writer.add_image('train/Predicted_label', grid_image, iter_num)
image = label_batch[0, :, :, 20:61:10].unsqueeze(0).permute(
3, 0, 1, 2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=False)
writer.add_image('train/Groundtruth_label', grid_image,
iter_num)
if iter_num > 0 and iter_num % 200 == 0:
model.eval()
avg_metric = test_all_case(model,
args.root_path,
test_list="val.txt",
num_classes=2,
patch_size=args.patch_size,
stride_xy=64,
stride_z=64)
if avg_metric[:, 0].mean() > best_performance:
best_performance = avg_metric[:, 0].mean()
save_mode_path = os.path.join(
snapshot_path, 'iter_{}_dice_{}.pth'.format(
iter_num, round(best_performance, 4)))
save_best = os.path.join(
snapshot_path, '{}_best_model.pth'.format(args.model))
torch.save(model.state_dict(), save_mode_path)
torch.save(model.state_dict(), save_best)
writer.add_scalar('info/val_dice_score', avg_metric[0, 0],
iter_num)
writer.add_scalar('info/val_hd95', avg_metric[0, 1], iter_num)
logging.info('iteration %d : dice_score : %f hd95 : %f' %
(iter_num, avg_metric[0, 0].mean(),
avg_metric[0, 1].mean()))
model.train()
if iter_num % 3000 == 0:
save_mode_path = os.path.join(snapshot_path,
'iter_' + str(iter_num) + '.pth')
torch.save(model.state_dict(), save_mode_path)
logging.info("save model to {}".format(save_mode_path))
if iter_num >= max_iterations:
break
if iter_num >= max_iterations:
iterator.close()
break
writer.close()
return "Training Finished!"
def train(args, snapshot_path):
base_lr = args.base_lr
train_data_path = args.root_path
batch_size = args.batch_size
max_iterations = args.max_iterations
num_classes = 2
model = net_factory_3d(net_type=args.model, in_chns=1, class_num=num_classes)
db_train = BraTS2019(base_dir=train_data_path,
split='train',
num=args.labeled_num,
transform=transforms.Compose([
RandomRotFlip(),
RandomCrop(args.patch_size),
ToTensor(),
]))
def worker_init_fn(worker_id):
random.seed(args.seed + worker_id)
trainloader = DataLoader(db_train, batch_size=batch_size, shuffle=True,
num_workers=16, pin_memory=True, worker_init_fn=worker_init_fn)
model.train()
optimizer = optim.SGD(model.parameters(), lr=base_lr,
momentum=0.9, weight_decay=0.0001)
ce_loss = CrossEntropyLoss()
dice_loss = losses.DiceLoss(2)
writer = SummaryWriter(snapshot_path + '/log')
logging.info("{} iterations per epoch".format(len(trainloader)))
iter_num = 0
max_epoch = max_iterations // len(trainloader) + 1
best_performance = 0.0
iterator = tqdm(range(max_epoch), ncols=70)
for epoch_num in iterator:
for i_batch, sampled_batch in enumerate(trainloader):
volume_batch, label_batch = sampled_batch['image'], sampled_batch['label']
volume_batch, label_batch = volume_batch.cuda(), label_batch.cuda()
outputs = model(volume_batch)
outputs_soft = torch.softmax(outputs, dim=1)
loss_ce = ce_loss(outputs, label_batch)
loss_dice = dice_loss(outputs_soft, label_batch.unsqueeze(1))
loss = 0.5 * (loss_dice + loss_ce)
optimizer.zero_grad()
loss.backward()
optimizer.step()
lr_ = base_lr * (1.0 - iter_num / max_iterations) ** 0.9
for param_group in optimizer.param_groups:
param_group['lr'] = lr_
iter_num = iter_num + 1
writer.add_scalar('info/lr', lr_, iter_num)
writer.add_scalar('info/total_loss', loss, iter_num)
writer.add_scalar('info/loss_ce', loss_ce, iter_num)
writer.add_scalar('info/loss_dice', loss_dice, iter_num)
logging.info(
'iteration %d : loss : %f, loss_ce: %f, loss_dice: %f' %
(iter_num, loss.item(), loss_ce.item(), loss_dice.item()))
writer.add_scalar('loss/loss', loss, iter_num)
if iter_num % 20 == 0:
image = volume_batch[0, 0:1, :, :, 20:61:10].permute(
3, 0, 1, 2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=True)
writer.add_image('train/Image', grid_image, iter_num)
image = outputs_soft[0, 1:2, :, :, 20:61:10].permute(
3, 0, 1, 2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=False)
writer.add_image('train/Predicted_label',
grid_image, iter_num)
image = label_batch[0, :, :, 20:61:10].unsqueeze(
0).permute(3, 0, 1, 2).repeat(1, 3, 1, 1)
grid_image = make_grid(image, 5, normalize=False)
writer.add_image('train/Groundtruth_label',
grid_image, iter_num)
if iter_num > 0 and iter_num % 200 == 0:
model.eval()
avg_metric = test_all_case(
model, args.root_path, test_list="val.txt", num_classes=2, patch_size=args.patch_size,
stride_xy=64, stride_z=64)
if avg_metric[:, 0].mean() > best_performance:
best_performance = avg_metric[:, 0].mean()
save_mode_path = os.path.join(snapshot_path,
'iter_{}_dice_{}.pth'.format(
iter_num, round(best_performance, 4)))
save_best = os.path.join(snapshot_path,
'{}_best_model.pth'.format(args.model))
torch.save(model.state_dict(), save_mode_path)
torch.save(model.state_dict(), save_best)
writer.add_scalar('info/val_dice_score',
avg_metric[0, 0], iter_num)
writer.add_scalar('info/val_hd95',
avg_metric[0, 1], iter_num)
logging.info(
'iteration %d : dice_score : %f hd95 : %f' % (iter_num, avg_metric[0, 0].mean(), avg_metric[0, 1].mean()))
model.train()
if iter_num % 3000 == 0:
save_mode_path = os.path.join(
snapshot_path, 'iter_' + str(iter_num) + '.pth')
torch.save(model.state_dict(), save_mode_path)
logging.info("save model to {}".format(save_mode_path))
if iter_num >= max_iterations:
break
if iter_num >= max_iterations:
iterator.close()
break
writer.close()
return "Training Finished!"
