def test_value(self):
key = "img"
scaler = RandScaleIntensityd(keys=[key], factors=0.5, prob=1.0)
scaler.set_random_state(seed=0)
result = scaler({key: self.imt})
np.random.seed(0)
expected = (self.imt * (1 + np.random.uniform(low=-0.5, high=0.5))).astype(np.float32)
np.testing.assert_allclose(result[key], expected)
def test_value(self):
key = "img"
for p in TEST_NDARRAYS:
scaler = RandScaleIntensityd(keys=[key], factors=0.5, prob=1.0)
scaler.set_random_state(seed=0)
result = scaler({key: p(self.imt)})
np.random.seed(0)
# simulate the randomize function of transform
np.random.random()
expected = (self.imt * (1 + np.random.uniform(low=-0.5, high=0.5))).astype(np.float32)
assert_allclose(result[key], p(expected), type_test="tensor")
def test_warn_random_but_has_no_invertible(self):
transforms = Compose(
[AddChanneld("image"), RandFlipd("image", prob=1.0), RandScaleIntensityd("image", 0.1, prob=1.0)]
)
with self.assertWarns(UserWarning):
tta = TestTimeAugmentation(transforms, 5, 0, orig_key="image")
tta(self.get_data(1, (20, 20), data_type=np.float32))
def test_inverse_compose(self):
transform = Compose(
[
Resized(keys="img", spatial_size=[100, 100, 100]),
OneOf(
[
RandScaleIntensityd(keys="img", factors=0.5, prob=1.0),
RandShiftIntensityd(keys="img", offsets=0.5, prob=1.0),
]
),
]
)
transform.set_random_state(seed=0)
result = transform({"img": np.ones((1, 101, 102, 103))})
result = transform.inverse(result)
# invert to the original spatial shape
self.assertTupleEqual(result["img"].shape, (1, 101, 102, 103))
def run_training(train_file_list, valid_file_list, config_info):
"""
Pipeline to train a dynUNet segmentation model in MONAI. It is composed of the following main blocks:
* Data Preparation: Extract the filenames and prepare the training/validation processing transforms
* Load Data: Load training and validation data to PyTorch DataLoader
* Network Preparation: Define the network, loss function, optimiser and learning rate scheduler
* MONAI Evaluator: Initialise the dynUNet evaluator, i.e. the class providing utilities to perform validation
during training. Attach handlers to save the best model on the validation set. A 2D sliding window approach
on the 3D volume is used at evaluation. The mean 3D Dice is used as validation metric.
* MONAI Trainer: Initialise the dynUNet trainer, i.e. the class providing utilities to perform the training loop.
* Run training: The MONAI trainer is run, performing training and validation during training.
Args:
train_file_list: .txt or .csv file (with no header) storing two-columns filenames for training:
image filename in the first column and segmentation filename in the second column.
The two columns should be separated by a comma.
See monaifbs/config/mock_train_file_list_for_dynUnet_training.txt for an example of the expected format.
valid_file_list: .txt or .csv file (with no header) storing two-columns filenames for validation:
image filename in the first column and segmentation filename in the second column.
The two columns should be separated by a comma.
See monaifbs/config/mock_valid_file_list_for_dynUnet_training.txt for an example of the expected format.
config_info: dict, contains configuration parameters for sampling, network and training.
See monaifbs/config/monai_dynUnet_training_config.yml for an example of the expected fields.
"""
"""
Read input and configuration parameters
"""
# print MONAI config information
logging.basicConfig(stream=sys.stdout, level=logging.INFO)
print_config()
# print to log the parameter setups
print(yaml.dump(config_info))
# extract network parameters, perform checks/set defaults if not present and print them to log
if 'seg_labels' in config_info['training'].keys():
seg_labels = config_info['training']['seg_labels']
else:
seg_labels = [1]
nr_out_channels = len(seg_labels)
print("Considering the following {} labels in the segmentation: {}".format(nr_out_channels, seg_labels))
patch_size = config_info["training"]["inplane_size"] + [1]
print("Considering patch size = {}".format(patch_size))
spacing = config_info["training"]["spacing"]
print("Bringing all images to spacing = {}".format(spacing))
if 'model_to_load' in config_info['training'].keys() and config_info['training']['model_to_load'] is not None:
model_to_load = config_info['training']['model_to_load']
if not os.path.exists(model_to_load):
raise FileNotFoundError("Cannot find model: {}".format(model_to_load))
else:
print("Loading model from {}".format(model_to_load))
else:
model_to_load = None
# set up either GPU or CPU usage
if torch.cuda.is_available():
print("\n#### GPU INFORMATION ###")
print("Using device number: {}, name: {}\n".format(torch.cuda.current_device(), torch.cuda.get_device_name()))
current_device = torch.device("cuda:0")
else:
current_device = torch.device("cpu")
print("Using device: {}".format(current_device))
# set determinism if required
if 'manual_seed' in config_info['training'].keys() and config_info['training']['manual_seed'] is not None:
seed = config_info['training']['manual_seed']
else:
seed = None
if seed is not None:
print("Using determinism with seed = {}\n".format(seed))
set_determinism(seed=seed)
"""
Setup data output directory
"""
out_model_dir = os.path.join(config_info['output']['out_dir'],
datetime.now().strftime('%Y-%m-%d_%H-%M-%S') + '_' +
config_info['output']['out_postfix'])
print("Saving to directory {}\n".format(out_model_dir))
# create cache directory to store results for Persistent Dataset
if 'cache_dir' in config_info['output'].keys():
out_cache_dir = config_info['output']['cache_dir']
else:
out_cache_dir = os.path.join(out_model_dir, 'persistent_cache')
persistent_cache: Path = Path(out_cache_dir)
persistent_cache.mkdir(parents=True, exist_ok=True)
"""
Data preparation
"""
# Read the input files for training and validation
print("*** Loading input data for training...")
train_files = create_data_list_of_dictionaries(train_file_list)
print("Number of inputs for training = {}".format(len(train_files)))
val_files = create_data_list_of_dictionaries(valid_file_list)
print("Number of inputs for validation = {}".format(len(val_files)))
# Define MONAI processing transforms for the training data. This includes:
# - Load Nifti files and convert to format Batch x Channel x Dim1 x Dim2 x Dim3
# - CropForegroundd: Reduce the background from the MR image
# - InPlaneSpacingd: Perform in-plane resampling to the desired spacing, but preserve the resolution along the
# last direction (lowest resolution) to avoid introducing motion artefact resampling errors
# - SpatialPadd: Pad the in-plane size to the defined network input patch size [N, M] if needed
# - NormalizeIntensityd: Apply whitening
# - RandSpatialCropd: Crop a random patch from the input with size [B, C, N, M, 1]
# - SqueezeDimd: Convert the 3D patch to a 2D one as input to the network (i.e. bring it to size [B, C, N, M])
# - Apply data augmentation (RandZoomd, RandRotated, RandGaussianNoised, RandGaussianSmoothd, RandScaleIntensityd,
# RandFlipd)
# - ToTensor: convert to pytorch tensor
train_transforms = Compose(
[
LoadNiftid(keys=["image", "label"]),
AddChanneld(keys=["image", "label"]),
CropForegroundd(keys=["image", "label"], source_key="image"),
InPlaneSpacingd(
keys=["image", "label"],
pixdim=spacing,
mode=("bilinear", "nearest"),
),
SpatialPadd(keys=["image", "label"], spatial_size=patch_size,
mode=["constant", "edge"]),
NormalizeIntensityd(keys=["image"], nonzero=False, channel_wise=True),
RandSpatialCropd(keys=["image", "label"], roi_size=patch_size, random_size=False),
SqueezeDimd(keys=["image", "label"], dim=-1),
RandZoomd(
keys=["image", "label"],
min_zoom=0.9,
max_zoom=1.2,
mode=("bilinear", "nearest"),
align_corners=(True, None),
prob=0.16,
),
RandRotated(keys=["image", "label"], range_x=90, range_y=90, prob=0.2,
keep_size=True, mode=["bilinear", "nearest"],
padding_mode=["zeros", "border"]),
RandGaussianNoised(keys=["image"], std=0.01, prob=0.15),
RandGaussianSmoothd(
keys=["image"],
sigma_x=(0.5, 1.15),
sigma_y=(0.5, 1.15),
sigma_z=(0.5, 1.15),
prob=0.15,
),
RandScaleIntensityd(keys=["image"], factors=0.3, prob=0.15),
RandFlipd(["image", "label"], spatial_axis=[0, 1], prob=0.5),
ToTensord(keys=["image", "label"]),
]
)
# Define MONAI processing transforms for the validation data
# - Load Nifti files and convert to format Batch x Channel x Dim1 x Dim2 x Dim3
# - CropForegroundd: Reduce the background from the MR image
# - InPlaneSpacingd: Perform in-plane resampling to the desired spacing, but preserve the resolution along the
# last direction (lowest resolution) to avoid introducing motion artefact resampling errors
# - SpatialPadd: Pad the in-plane size to the defined network input patch size [N, M] if needed
# - NormalizeIntensityd: Apply whitening
# - ToTensor: convert to pytorch tensor
# NOTE: The validation data is kept 3D as a 2D sliding window approach is used throughout the volume at inference
val_transforms = Compose(
[
LoadNiftid(keys=["image", "label"]),
AddChanneld(keys=["image", "label"]),
CropForegroundd(keys=["image", "label"], source_key="image"),
InPlaneSpacingd(
keys=["image", "label"],
pixdim=spacing,
mode=("bilinear", "nearest"),
),
SpatialPadd(keys=["image", "label"], spatial_size=patch_size, mode=["constant", "edge"]),
NormalizeIntensityd(keys=["image"], nonzero=False, channel_wise=True),
ToTensord(keys=["image", "label"]),
]
)
"""
Load data
"""
# create training data loader
train_ds = PersistentDataset(data=train_files, transform=train_transforms,
cache_dir=persistent_cache)
train_loader = DataLoader(train_ds,
batch_size=config_info['training']['batch_size_train'],
shuffle=True,
num_workers=config_info['device']['num_workers'])
check_train_data = misc.first(train_loader)
print("Training data tensor shapes:")
print("Image = {}; Label = {}".format(check_train_data["image"].shape, check_train_data["label"].shape))
# create validation data loader
if config_info['training']['batch_size_valid'] != 1:
raise Exception("Batch size different from 1 at validation ar currently not supported")
val_ds = PersistentDataset(data=val_files, transform=val_transforms, cache_dir=persistent_cache)
val_loader = DataLoader(val_ds,
batch_size=1,
shuffle=False,
num_workers=config_info['device']['num_workers'])
check_valid_data = misc.first(val_loader)
print("Validation data tensor shapes (Example):")
print("Image = {}; Label = {}\n".format(check_valid_data["image"].shape, check_valid_data["label"].shape))
"""
Network preparation
"""
print("*** Preparing the network ...")
# automatically extracts the strides and kernels based on nnU-Net empirical rules
spacings = spacing[:2]
sizes = patch_size[:2]
strides, kernels = [], []
while True:
spacing_ratio = [sp / min(spacings) for sp in spacings]
stride = [2 if ratio <= 2 and size >= 8 else 1 for (ratio, size) in zip(spacing_ratio, sizes)]
kernel = [3 if ratio <= 2 else 1 for ratio in spacing_ratio]
if all(s == 1 for s in stride):
break
sizes = [i / j for i, j in zip(sizes, stride)]
spacings = [i * j for i, j in zip(spacings, stride)]
kernels.append(kernel)
strides.append(stride)
strides.insert(0, len(spacings) * [1])
kernels.append(len(spacings) * [3])
# initialise the network
net = DynUNet(
spatial_dims=2,
in_channels=1,
out_channels=nr_out_channels,
kernel_size=kernels,
strides=strides,
upsample_kernel_size=strides[1:],
norm_name="instance",
deep_supervision=True,
deep_supr_num=2,
res_block=False,
).to(current_device)
print(net)
# define the loss function
loss_function = choose_loss_function(nr_out_channels, config_info)
# define the optimiser and the learning rate scheduler
opt = torch.optim.SGD(net.parameters(), lr=float(config_info['training']['lr']), momentum=0.95)
scheduler = torch.optim.lr_scheduler.LambdaLR(
opt, lr_lambda=lambda epoch: (1 - epoch / config_info['training']['nr_train_epochs']) ** 0.9
)
"""
MONAI evaluator
"""
print("*** Preparing the dynUNet evaluator engine...\n")
# val_post_transforms = Compose(
# [
# Activationsd(keys="pred", sigmoid=True),
# ]
# )
val_handlers = [
StatsHandler(output_transform=lambda x: None),
TensorBoardStatsHandler(log_dir=os.path.join(out_model_dir, "valid"),
output_transform=lambda x: None,
global_epoch_transform=lambda x: trainer.state.iteration),
CheckpointSaver(save_dir=out_model_dir, save_dict={"net": net, "opt": opt}, save_key_metric=True,
file_prefix='best_valid'),
]
if config_info['output']['val_image_to_tensorboad']:
val_handlers.append(TensorBoardImageHandler(log_dir=os.path.join(out_model_dir, "valid"),
batch_transform=lambda x: (x["image"], x["label"]),
output_transform=lambda x: x["pred"], interval=2))
# Define customized evaluator
class DynUNetEvaluator(SupervisedEvaluator):
def _iteration(self, engine, batchdata):
inputs, targets = self.prepare_batch(batchdata)
inputs, targets = inputs.to(engine.state.device), targets.to(engine.state.device)
flip_inputs_1 = torch.flip(inputs, dims=(2,))
flip_inputs_2 = torch.flip(inputs, dims=(3,))
flip_inputs_3 = torch.flip(inputs, dims=(2, 3))
def _compute_pred():
pred = self.inferer(inputs, self.network)
# use random flipping as data augmentation at inference
flip_pred_1 = torch.flip(self.inferer(flip_inputs_1, self.network), dims=(2,))
flip_pred_2 = torch.flip(self.inferer(flip_inputs_2, self.network), dims=(3,))
flip_pred_3 = torch.flip(self.inferer(flip_inputs_3, self.network), dims=(2, 3))
return (pred + flip_pred_1 + flip_pred_2 + flip_pred_3) / 4
# execute forward computation
self.network.eval()
with torch.no_grad():
if self.amp:
with torch.cuda.amp.autocast():
predictions = _compute_pred()
else:
predictions = _compute_pred()
return {"image": inputs, "label": targets, "pred": predictions}
evaluator = DynUNetEvaluator(
device=current_device,
val_data_loader=val_loader,
network=net,
inferer=SlidingWindowInferer2D(roi_size=patch_size, sw_batch_size=4, overlap=0.0),
post_transform=None,
key_val_metric={
"Mean_dice": MeanDice(
include_background=False,
to_onehot_y=True,
mutually_exclusive=True,
output_transform=lambda x: (x["pred"], x["label"]),
)
},
val_handlers=val_handlers,
amp=False,
)
"""
MONAI trainer
"""
print("*** Preparing the dynUNet trainer engine...\n")
# train_post_transforms = Compose(
# [
# Activationsd(keys="pred", sigmoid=True),
# ]
# )
validation_every_n_epochs = config_info['training']['validation_every_n_epochs']
epoch_len = len(train_ds) // train_loader.batch_size
validation_every_n_iters = validation_every_n_epochs * epoch_len
# define event handlers for the trainer
writer_train = SummaryWriter(log_dir=os.path.join(out_model_dir, "train"))
train_handlers = [
LrScheduleHandler(lr_scheduler=scheduler, print_lr=True),
ValidationHandler(validator=evaluator, interval=validation_every_n_iters, epoch_level=False),
StatsHandler(tag_name="train_loss", output_transform=lambda x: x["loss"]),
TensorBoardStatsHandler(summary_writer=writer_train,
log_dir=os.path.join(out_model_dir, "train"), tag_name="Loss",
output_transform=lambda x: x["loss"],
global_epoch_transform=lambda x: trainer.state.iteration),
CheckpointSaver(save_dir=out_model_dir, save_dict={"net": net, "opt": opt},
save_final=True,
save_interval=2, epoch_level=True,
n_saved=config_info['output']['max_nr_models_saved']),
]
if model_to_load is not None:
train_handlers.append(CheckpointLoader(load_path=model_to_load, load_dict={"net": net, "opt": opt}))
# define customized trainer
class DynUNetTrainer(SupervisedTrainer):
def _iteration(self, engine, batchdata):
inputs, targets = self.prepare_batch(batchdata)
inputs, targets = inputs.to(engine.state.device), targets.to(engine.state.device)
def _compute_loss(preds, label):
labels = [label] + [interpolate(label, pred.shape[2:]) for pred in preds[1:]]
return sum([0.5 ** i * self.loss_function(p, l) for i, (p, l) in enumerate(zip(preds, labels))])
self.network.train()
self.optimizer.zero_grad()
if self.amp and self.scaler is not None:
with torch.cuda.amp.autocast():
predictions = self.inferer(inputs, self.network)
loss = _compute_loss(predictions, targets)
self.scaler.scale(loss).backward()
self.scaler.step(self.optimizer)
self.scaler.update()
else:
predictions = self.inferer(inputs, self.network)
loss = _compute_loss(predictions, targets).mean()
loss.backward()
self.optimizer.step()
return {"image": inputs, "label": targets, "pred": predictions, "loss": loss.item()}
trainer = DynUNetTrainer(
device=current_device,
max_epochs=config_info['training']['nr_train_epochs'],
train_data_loader=train_loader,
network=net,
optimizer=opt,
loss_function=loss_function,
inferer=SimpleInferer(),
post_transform=None,
key_train_metric=None,
train_handlers=train_handlers,
amp=False,
)
"""
Run training
"""
print("*** Run training...")
trainer.run()
print("Done!")
def main_worker(args):
# disable logging for processes except 0 on every node
if args.local_rank != 0:
f = open(os.devnull, "w")
sys.stdout = sys.stderr = f
if not os.path.exists(args.dir):
raise FileNotFoundError(f"Missing directory {args.dir}")
# initialize the distributed training process, every GPU runs in a process
dist.init_process_group(backend="nccl", init_method="env://")
total_start = time.time()
train_transforms = Compose([
# load 4 Nifti images and stack them together
LoadNiftid(keys=["image", "label"]),
AsChannelFirstd(keys="image"),
ConvertToMultiChannelBasedOnBratsClassesd(keys="label"),
Spacingd(keys=["image", "label"],
pixdim=(1.5, 1.5, 2.0),
mode=("bilinear", "nearest")),
Orientationd(keys=["image", "label"], axcodes="RAS"),
RandSpatialCropd(keys=["image", "label"],
roi_size=[128, 128, 64],
random_size=False),
NormalizeIntensityd(keys="image", nonzero=True, channel_wise=True),
RandFlipd(keys=["image", "label"], prob=0.5, spatial_axis=0),
RandScaleIntensityd(keys="image", factors=0.1, prob=0.5),
RandShiftIntensityd(keys="image", offsets=0.1, prob=0.5),
ToTensord(keys=["image", "label"]),
])
# create a training data loader
train_ds = BratsCacheDataset(
root_dir=args.dir,
transform=train_transforms,
section="training",
num_workers=4,
cache_rate=args.cache_rate,
shuffle=True,
)
train_loader = DataLoader(train_ds,
batch_size=args.batch_size,
shuffle=True,
num_workers=args.workers,
pin_memory=True)
# validation transforms and dataset
val_transforms = Compose([
LoadNiftid(keys=["image", "label"]),
AsChannelFirstd(keys="image"),
ConvertToMultiChannelBasedOnBratsClassesd(keys="label"),
Spacingd(keys=["image", "label"],
pixdim=(1.5, 1.5, 2.0),
mode=("bilinear", "nearest")),
Orientationd(keys=["image", "label"], axcodes="RAS"),
CenterSpatialCropd(keys=["image", "label"], roi_size=[128, 128, 64]),
NormalizeIntensityd(keys="image", nonzero=True, channel_wise=True),
ToTensord(keys=["image", "label"]),
])
val_ds = BratsCacheDataset(
root_dir=args.dir,
transform=val_transforms,
section="validation",
num_workers=4,
cache_rate=args.cache_rate,
shuffle=False,
)
val_loader = DataLoader(val_ds,
batch_size=args.batch_size,
shuffle=False,
num_workers=args.workers,
pin_memory=True)
if dist.get_rank() == 0:
# Logging for TensorBoard
writer = SummaryWriter(log_dir=args.log_dir)
# create UNet, DiceLoss and Adam optimizer
device = torch.device(f"cuda:{args.local_rank}")
if args.network == "UNet":
model = UNet(
dimensions=3,
in_channels=4,
out_channels=3,
channels=(16, 32, 64, 128, 256),
strides=(2, 2, 2, 2),
num_res_units=2,
).to(device)
else:
model = SegResNet(in_channels=4,
out_channels=3,
init_filters=16,
dropout_prob=0.2).to(device)
loss_function = DiceLoss(to_onehot_y=False,
sigmoid=True,
squared_pred=True)
optimizer = torch.optim.Adam(model.parameters(),
lr=args.lr,
weight_decay=1e-5,
amsgrad=True)
# wrap the model with DistributedDataParallel module
model = DistributedDataParallel(model, device_ids=[args.local_rank])
# start a typical PyTorch training
total_epoch = args.epochs
best_metric = -1000000
best_metric_epoch = -1
epoch_time = AverageMeter("Time", ":6.3f")
progress = ProgressMeter(total_epoch, [epoch_time], prefix="Epoch: ")
end = time.time()
print(f"Time elapsed before training: {end-total_start}")
for epoch in range(total_epoch):
train_loss = train(train_loader, model, loss_function, optimizer,
epoch, args, device)
epoch_time.update(time.time() - end)
if epoch % args.print_freq == 0:
progress.display(epoch)
if dist.get_rank() == 0:
writer.add_scalar("Loss/train", train_loss, epoch)
if (epoch + 1) % args.val_interval == 0:
metric, metric_tc, metric_wt, metric_et = evaluate(
model, val_loader, device)
if dist.get_rank() == 0:
writer.add_scalar("Mean Dice/val", metric, epoch)
writer.add_scalar("Mean Dice TC/val", metric_tc, epoch)
writer.add_scalar("Mean Dice WT/val", metric_wt, epoch)
writer.add_scalar("Mean Dice ET/val", metric_et, epoch)
if metric > best_metric:
best_metric = metric
best_metric_epoch = epoch + 1
print(
f"current epoch: {epoch + 1} current mean dice: {metric:.4f}"
f" tc: {metric_tc:.4f} wt: {metric_wt:.4f} et: {metric_et:.4f}"
f"\nbest mean dice: {best_metric:.4f} at epoch: {best_metric_epoch}"
)
end = time.time()
print(f"Time elapsed after epoch {epoch + 1} is {end - total_start}")
if dist.get_rank() == 0:
print(
f"train completed, best_metric: {best_metric:.4f} at epoch: {best_metric_epoch}"
)
# all processes should see same parameters as they all start from same
# random parameters and gradients are synchronized in backward passes,
# therefore, saving it in one process is sufficient
torch.save(model.state_dict(), "final_model.pth")
writer.flush()
dist.destroy_process_group()
def get_task_transforms(mode, task_id, pos_sample_num, neg_sample_num,
num_samples):
if mode != "test":
keys = ["image", "label"]
else:
keys = ["image"]
load_transforms = [
LoadImaged(keys=keys),
EnsureChannelFirstd(keys=keys),
]
# 2. sampling
sample_transforms = [
PreprocessAnisotropic(
keys=keys,
clip_values=clip_values[task_id],
pixdim=spacing[task_id],
normalize_values=normalize_values[task_id],
model_mode=mode,
),
]
# 3. spatial transforms
if mode == "train":
other_transforms = [
SpatialPadd(keys=["image", "label"],
spatial_size=patch_size[task_id]),
RandCropByPosNegLabeld(
keys=["image", "label"],
label_key="label",
spatial_size=patch_size[task_id],
pos=pos_sample_num,
neg=neg_sample_num,
num_samples=num_samples,
image_key="image",
image_threshold=0,
),
RandZoomd(
keys=["image", "label"],
min_zoom=0.9,
max_zoom=1.2,
mode=("trilinear", "nearest"),
align_corners=(True, None),
prob=0.15,
),
RandGaussianNoised(keys=["image"], std=0.01, prob=0.15),
RandGaussianSmoothd(
keys=["image"],
sigma_x=(0.5, 1.15),
sigma_y=(0.5, 1.15),
sigma_z=(0.5, 1.15),
prob=0.15,
),
RandScaleIntensityd(keys=["image"], factors=0.3, prob=0.15),
RandFlipd(["image", "label"], spatial_axis=[0], prob=0.5),
RandFlipd(["image", "label"], spatial_axis=[1], prob=0.5),
RandFlipd(["image", "label"], spatial_axis=[2], prob=0.5),
CastToTyped(keys=["image", "label"], dtype=(np.float32, np.uint8)),
EnsureTyped(keys=["image", "label"]),
]
elif mode == "validation":
other_transforms = [
CastToTyped(keys=["image", "label"], dtype=(np.float32, np.uint8)),
EnsureTyped(keys=["image", "label"]),
]
else:
other_transforms = [
CastToTyped(keys=["image"], dtype=(np.float32)),
EnsureTyped(keys=["image"]),
]
all_transforms = load_transforms + sample_transforms + other_transforms
return Compose(all_transforms)
def main_worker(args):
# disable logging for processes except 0 on every node
if args.local_rank != 0:
f = open(os.devnull, "w")
sys.stdout = sys.stderr = f
if not os.path.exists(args.dir):
raise FileNotFoundError(f"missing directory {args.dir}")
# initialize the distributed training process, every GPU runs in a process
dist.init_process_group(backend="nccl", init_method="env://")
device = torch.device(f"cuda:{args.local_rank}")
torch.cuda.set_device(device)
# use amp to accelerate training
scaler = torch.cuda.amp.GradScaler()
torch.backends.cudnn.benchmark = True
total_start = time.time()
train_transforms = Compose([
# load 4 Nifti images and stack them together
LoadImaged(keys=["image", "label"]),
EnsureChannelFirstd(keys="image"),
ConvertToMultiChannelBasedOnBratsClassesd(keys="label"),
Orientationd(keys=["image", "label"], axcodes="RAS"),
Spacingd(
keys=["image", "label"],
pixdim=(1.0, 1.0, 1.0),
mode=("bilinear", "nearest"),
),
EnsureTyped(keys=["image", "label"]),
ToDeviced(keys=["image", "label"], device=device),
RandSpatialCropd(keys=["image", "label"],
roi_size=[224, 224, 144],
random_size=False),
RandFlipd(keys=["image", "label"], prob=0.5, spatial_axis=0),
RandFlipd(keys=["image", "label"], prob=0.5, spatial_axis=1),
RandFlipd(keys=["image", "label"], prob=0.5, spatial_axis=2),
NormalizeIntensityd(keys="image", nonzero=True, channel_wise=True),
RandScaleIntensityd(keys="image", factors=0.1, prob=0.5),
RandShiftIntensityd(keys="image", offsets=0.1, prob=0.5),
])
# create a training data loader
train_ds = BratsCacheDataset(
root_dir=args.dir,
transform=train_transforms,
section="training",
num_workers=4,
cache_rate=args.cache_rate,
shuffle=True,
)
# ThreadDataLoader can be faster if no IO operations when caching all the data in memory
train_loader = ThreadDataLoader(train_ds,
num_workers=0,
batch_size=args.batch_size,
shuffle=True)
# validation transforms and dataset
val_transforms = Compose([
LoadImaged(keys=["image", "label"]),
EnsureChannelFirstd(keys="image"),
ConvertToMultiChannelBasedOnBratsClassesd(keys="label"),
Orientationd(keys=["image", "label"], axcodes="RAS"),
Spacingd(
keys=["image", "label"],
pixdim=(1.0, 1.0, 1.0),
mode=("bilinear", "nearest"),
),
NormalizeIntensityd(keys="image", nonzero=True, channel_wise=True),
EnsureTyped(keys=["image", "label"]),
ToDeviced(keys=["image", "label"], device=device),
])
val_ds = BratsCacheDataset(
root_dir=args.dir,
transform=val_transforms,
section="validation",
num_workers=4,
cache_rate=args.cache_rate,
shuffle=False,
)
# ThreadDataLoader can be faster if no IO operations when caching all the data in memory
val_loader = ThreadDataLoader(val_ds,
num_workers=0,
batch_size=args.batch_size,
shuffle=False)
# create network, loss function and optimizer
if args.network == "SegResNet":
model = SegResNet(
blocks_down=[1, 2, 2, 4],
blocks_up=[1, 1, 1],
init_filters=16,
in_channels=4,
out_channels=3,
dropout_prob=0.0,
).to(device)
else:
model = UNet(
spatial_dims=3,
in_channels=4,
out_channels=3,
channels=(16, 32, 64, 128, 256),
strides=(2, 2, 2, 2),
num_res_units=2,
).to(device)
loss_function = DiceFocalLoss(
smooth_nr=1e-5,
smooth_dr=1e-5,
squared_pred=True,
to_onehot_y=False,
sigmoid=True,
batch=True,
)
optimizer = Novograd(model.parameters(), lr=args.lr)
lr_scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(
optimizer, T_max=args.epochs)
# wrap the model with DistributedDataParallel module
model = DistributedDataParallel(model, device_ids=[device])
dice_metric = DiceMetric(include_background=True, reduction="mean")
dice_metric_batch = DiceMetric(include_background=True,
reduction="mean_batch")
post_trans = Compose(
[EnsureType(),
Activations(sigmoid=True),
AsDiscrete(threshold=0.5)])
# start a typical PyTorch training
best_metric = -1
best_metric_epoch = -1
print(f"time elapsed before training: {time.time() - total_start}")
train_start = time.time()
for epoch in range(args.epochs):
epoch_start = time.time()
print("-" * 10)
print(f"epoch {epoch + 1}/{args.epochs}")
epoch_loss = train(train_loader, model, loss_function, optimizer,
lr_scheduler, scaler)
print(f"epoch {epoch + 1} average loss: {epoch_loss:.4f}")
if (epoch + 1) % args.val_interval == 0:
metric, metric_tc, metric_wt, metric_et = evaluate(
model, val_loader, dice_metric, dice_metric_batch, post_trans)
if metric > best_metric:
best_metric = metric
best_metric_epoch = epoch + 1
if dist.get_rank() == 0:
torch.save(model.state_dict(), "best_metric_model.pth")
print(
f"current epoch: {epoch + 1} current mean dice: {metric:.4f}"
f" tc: {metric_tc:.4f} wt: {metric_wt:.4f} et: {metric_et:.4f}"
f"\nbest mean dice: {best_metric:.4f} at epoch: {best_metric_epoch}"
)
print(
f"time consuming of epoch {epoch + 1} is: {(time.time() - epoch_start):.4f}"
)
print(
f"train completed, best_metric: {best_metric:.4f} at epoch: {best_metric_epoch},"
f" total train time: {(time.time() - train_start):.4f}")
dist.destroy_process_group()
def main():
parser = argparse.ArgumentParser(description="training")
parser.add_argument(
"--checkpoint",
type=str,
default=None,
help="checkpoint full path",
)
parser.add_argument(
"--factor_ram_cost",
default=0.0,
type=float,
help="factor to determine RAM cost in the searched architecture",
)
parser.add_argument(
"--fold",
action="store",
required=True,
help="fold index in N-fold cross-validation",
)
parser.add_argument(
"--json",
action="store",
required=True,
help="full path of .json file",
)
parser.add_argument(
"--json_key",
action="store",
required=True,
help="selected key in .json data list",
)
parser.add_argument(
"--local_rank",
required=int,
help="local process rank",
)
parser.add_argument(
"--num_folds",
action="store",
required=True,
help="number of folds in cross-validation",
)
parser.add_argument(
"--output_root",
action="store",
required=True,
help="output root",
)
parser.add_argument(
"--root",
action="store",
required=True,
help="data root",
)
args = parser.parse_args()
logging.basicConfig(stream=sys.stdout, level=logging.INFO)
if not os.path.exists(args.output_root):
os.makedirs(args.output_root, exist_ok=True)
amp = True
determ = True
factor_ram_cost = args.factor_ram_cost
fold = int(args.fold)
input_channels = 1
learning_rate = 0.025
learning_rate_arch = 0.001
learning_rate_milestones = np.array([0.4, 0.8])
num_images_per_batch = 1
num_epochs = 1430 # around 20k iteration
num_epochs_per_validation = 100
num_epochs_warmup = 715
num_folds = int(args.num_folds)
num_patches_per_image = 1
num_sw_batch_size = 6
output_classes = 3
overlap_ratio = 0.625
patch_size = (96, 96, 96)
patch_size_valid = (96, 96, 96)
spacing = [1.0, 1.0, 1.0]
print("factor_ram_cost", factor_ram_cost)
# deterministic training
if determ:
set_determinism(seed=0)
# initialize the distributed training process, every GPU runs in a process
dist.init_process_group(backend="nccl", init_method="env://")
# dist.barrier()
world_size = dist.get_world_size()
with open(args.json, "r") as f:
json_data = json.load(f)
split = len(json_data[args.json_key]) // num_folds
list_train = json_data[args.json_key][:(
split * fold)] + json_data[args.json_key][(split * (fold + 1)):]
list_valid = json_data[args.json_key][(split * fold):(split * (fold + 1))]
# training data
files = []
for _i in range(len(list_train)):
str_img = os.path.join(args.root, list_train[_i]["image"])
str_seg = os.path.join(args.root, list_train[_i]["label"])
if (not os.path.exists(str_img)) or (not os.path.exists(str_seg)):
continue
files.append({"image": str_img, "label": str_seg})
train_files = files
random.shuffle(train_files)
train_files_w = train_files[:len(train_files) // 2]
train_files_w = partition_dataset(data=train_files_w,
shuffle=True,
num_partitions=world_size,
even_divisible=True)[dist.get_rank()]
print("train_files_w:", len(train_files_w))
train_files_a = train_files[len(train_files) // 2:]
train_files_a = partition_dataset(data=train_files_a,
shuffle=True,
num_partitions=world_size,
even_divisible=True)[dist.get_rank()]
print("train_files_a:", len(train_files_a))
# validation data
files = []
for _i in range(len(list_valid)):
str_img = os.path.join(args.root, list_valid[_i]["image"])
str_seg = os.path.join(args.root, list_valid[_i]["label"])
if (not os.path.exists(str_img)) or (not os.path.exists(str_seg)):
continue
files.append({"image": str_img, "label": str_seg})
val_files = files
val_files = partition_dataset(data=val_files,
shuffle=False,
num_partitions=world_size,
even_divisible=False)[dist.get_rank()]
print("val_files:", len(val_files))
# network architecture
device = torch.device(f"cuda:{args.local_rank}")
torch.cuda.set_device(device)
train_transforms = Compose([
LoadImaged(keys=["image", "label"]),
EnsureChannelFirstd(keys=["image", "label"]),
Orientationd(keys=["image", "label"], axcodes="RAS"),
Spacingd(keys=["image", "label"],
pixdim=spacing,
mode=("bilinear", "nearest"),
align_corners=(True, True)),
CastToTyped(keys=["image"], dtype=(torch.float32)),
ScaleIntensityRanged(keys=["image"],
a_min=-87.0,
a_max=199.0,
b_min=0.0,
b_max=1.0,
clip=True),
CastToTyped(keys=["image", "label"], dtype=(np.float16, np.uint8)),
CopyItemsd(keys=["label"], times=1, names=["label4crop"]),
Lambdad(
keys=["label4crop"],
func=lambda x: np.concatenate(tuple([
ndimage.binary_dilation(
(x == _k).astype(x.dtype), iterations=48).astype(x.dtype)
for _k in range(output_classes)
]),
axis=0),
overwrite=True,
),
EnsureTyped(keys=["image", "label"]),
CastToTyped(keys=["image"], dtype=(torch.float32)),
SpatialPadd(keys=["image", "label", "label4crop"],
spatial_size=patch_size,
mode=["reflect", "constant", "constant"]),
RandCropByLabelClassesd(keys=["image", "label"],
label_key="label4crop",
num_classes=output_classes,
ratios=[
1,
] * output_classes,
spatial_size=patch_size,
num_samples=num_patches_per_image),
Lambdad(keys=["label4crop"], func=lambda x: 0),
RandRotated(keys=["image", "label"],
range_x=0.3,
range_y=0.3,
range_z=0.3,
mode=["bilinear", "nearest"],
prob=0.2),
RandZoomd(keys=["image", "label"],
min_zoom=0.8,
max_zoom=1.2,
mode=["trilinear", "nearest"],
align_corners=[True, None],
prob=0.16),
RandGaussianSmoothd(keys=["image"],
sigma_x=(0.5, 1.15),
sigma_y=(0.5, 1.15),
sigma_z=(0.5, 1.15),
prob=0.15),
RandScaleIntensityd(keys=["image"], factors=0.3, prob=0.5),
RandShiftIntensityd(keys=["image"], offsets=0.1, prob=0.5),
RandGaussianNoised(keys=["image"], std=0.01, prob=0.15),
RandFlipd(keys=["image", "label"], spatial_axis=0, prob=0.5),
RandFlipd(keys=["image", "label"], spatial_axis=1, prob=0.5),
RandFlipd(keys=["image", "label"], spatial_axis=2, prob=0.5),
CastToTyped(keys=["image", "label"],
dtype=(torch.float32, torch.uint8)),
ToTensord(keys=["image", "label"]),
])
val_transforms = Compose([
LoadImaged(keys=["image", "label"]),
EnsureChannelFirstd(keys=["image", "label"]),
Orientationd(keys=["image", "label"], axcodes="RAS"),
Spacingd(keys=["image", "label"],
pixdim=spacing,
mode=("bilinear", "nearest"),
align_corners=(True, True)),
CastToTyped(keys=["image"], dtype=(torch.float32)),
ScaleIntensityRanged(keys=["image"],
a_min=-87.0,
a_max=199.0,
b_min=0.0,
b_max=1.0,
clip=True),
CastToTyped(keys=["image", "label"], dtype=(np.float32, np.uint8)),
EnsureTyped(keys=["image", "label"]),
ToTensord(keys=["image", "label"])
])
train_ds_a = monai.data.CacheDataset(data=train_files_a,
transform=train_transforms,
cache_rate=1.0,
num_workers=8)
train_ds_w = monai.data.CacheDataset(data=train_files_w,
transform=train_transforms,
cache_rate=1.0,
num_workers=8)
val_ds = monai.data.CacheDataset(data=val_files,
transform=val_transforms,
cache_rate=1.0,
num_workers=2)
# monai.data.Dataset can be used as alternatives when debugging or RAM space is limited.
# train_ds_a = monai.data.Dataset(data=train_files_a, transform=train_transforms)
# train_ds_w = monai.data.Dataset(data=train_files_w, transform=train_transforms)
# val_ds = monai.data.Dataset(data=val_files, transform=val_transforms)
train_loader_a = ThreadDataLoader(train_ds_a,
num_workers=0,
batch_size=num_images_per_batch,
shuffle=True)
train_loader_w = ThreadDataLoader(train_ds_w,
num_workers=0,
batch_size=num_images_per_batch,
shuffle=True)
val_loader = ThreadDataLoader(val_ds,
num_workers=0,
batch_size=1,
shuffle=False)
# DataLoader can be used as alternatives when ThreadDataLoader is less efficient.
# train_loader_a = DataLoader(train_ds_a, batch_size=num_images_per_batch, shuffle=True, num_workers=2, pin_memory=torch.cuda.is_available())
# train_loader_w = DataLoader(train_ds_w, batch_size=num_images_per_batch, shuffle=True, num_workers=2, pin_memory=torch.cuda.is_available())
# val_loader = DataLoader(val_ds, batch_size=1, shuffle=False, num_workers=2, pin_memory=torch.cuda.is_available())
dints_space = monai.networks.nets.TopologySearch(
channel_mul=0.5,
num_blocks=12,
num_depths=4,
use_downsample=True,
device=device,
)
model = monai.networks.nets.DiNTS(
dints_space=dints_space,
in_channels=input_channels,
num_classes=output_classes,
use_downsample=True,
)
model = model.to(device)
model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model)
post_pred = Compose(
[EnsureType(),
AsDiscrete(argmax=True, to_onehot=output_classes)])
post_label = Compose([EnsureType(), AsDiscrete(to_onehot=output_classes)])
# loss function
loss_func = monai.losses.DiceCELoss(
include_background=False,
to_onehot_y=True,
softmax=True,
squared_pred=True,
batch=True,
smooth_nr=0.00001,
smooth_dr=0.00001,
)
# optimizer
optimizer = torch.optim.SGD(model.weight_parameters(),
lr=learning_rate * world_size,
momentum=0.9,
weight_decay=0.00004)
arch_optimizer_a = torch.optim.Adam([dints_space.log_alpha_a],
lr=learning_rate_arch * world_size,
betas=(0.5, 0.999),
weight_decay=0.0)
arch_optimizer_c = torch.optim.Adam([dints_space.log_alpha_c],
lr=learning_rate_arch * world_size,
betas=(0.5, 0.999),
weight_decay=0.0)
print()
if torch.cuda.device_count() > 1:
if dist.get_rank() == 0:
print("Let's use", torch.cuda.device_count(), "GPUs!")
model = DistributedDataParallel(model,
device_ids=[device],
find_unused_parameters=True)
if args.checkpoint != None and os.path.isfile(args.checkpoint):
print("[info] fine-tuning pre-trained checkpoint {0:s}".format(
args.checkpoint))
model.load_state_dict(torch.load(args.checkpoint, map_location=device))
torch.cuda.empty_cache()
else:
print("[info] training from scratch")
# amp
if amp:
from torch.cuda.amp import autocast, GradScaler
scaler = GradScaler()
if dist.get_rank() == 0:
print("[info] amp enabled")
# start a typical PyTorch training
val_interval = num_epochs_per_validation
best_metric = -1
best_metric_epoch = -1
epoch_loss_values = list()
idx_iter = 0
metric_values = list()
if dist.get_rank() == 0:
writer = SummaryWriter(
log_dir=os.path.join(args.output_root, "Events"))
with open(os.path.join(args.output_root, "accuracy_history.csv"),
"a") as f:
f.write("epoch\tmetric\tloss\tlr\ttime\titer\n")
dataloader_a_iterator = iter(train_loader_a)
start_time = time.time()
for epoch in range(num_epochs):
decay = 0.5**np.sum([
(epoch - num_epochs_warmup) /
(num_epochs - num_epochs_warmup) > learning_rate_milestones
])
lr = learning_rate * decay
for param_group in optimizer.param_groups:
param_group["lr"] = lr
if dist.get_rank() == 0:
print("-" * 10)
print(f"epoch {epoch + 1}/{num_epochs}")
print("learning rate is set to {}".format(lr))
model.train()
epoch_loss = 0
loss_torch = torch.zeros(2, dtype=torch.float, device=device)
epoch_loss_arch = 0
loss_torch_arch = torch.zeros(2, dtype=torch.float, device=device)
step = 0
for batch_data in train_loader_w:
step += 1
inputs, labels = batch_data["image"].to(
device), batch_data["label"].to(device)
if world_size == 1:
for _ in model.weight_parameters():
_.requires_grad = True
else:
for _ in model.module.weight_parameters():
_.requires_grad = True
dints_space.log_alpha_a.requires_grad = False
dints_space.log_alpha_c.requires_grad = False
optimizer.zero_grad()
if amp:
with autocast():
outputs = model(inputs)
if output_classes == 2:
loss = loss_func(torch.flip(outputs, dims=[1]),
1 - labels)
else:
loss = loss_func(outputs, labels)
scaler.scale(loss).backward()
scaler.step(optimizer)
scaler.update()
else:
outputs = model(inputs)
if output_classes == 2:
loss = loss_func(torch.flip(outputs, dims=[1]), 1 - labels)
else:
loss = loss_func(outputs, labels)
loss.backward()
optimizer.step()
epoch_loss += loss.item()
loss_torch[0] += loss.item()
loss_torch[1] += 1.0
epoch_len = len(train_loader_w)
idx_iter += 1
if dist.get_rank() == 0:
print("[{0}] ".format(str(datetime.now())[:19]) +
f"{step}/{epoch_len}, train_loss: {loss.item():.4f}")
writer.add_scalar("train_loss", loss.item(),
epoch_len * epoch + step)
if epoch < num_epochs_warmup:
continue
try:
sample_a = next(dataloader_a_iterator)
except StopIteration:
dataloader_a_iterator = iter(train_loader_a)
sample_a = next(dataloader_a_iterator)
inputs_search, labels_search = sample_a["image"].to(
device), sample_a["label"].to(device)
if world_size == 1:
for _ in model.weight_parameters():
_.requires_grad = False
else:
for _ in model.module.weight_parameters():
_.requires_grad = False
dints_space.log_alpha_a.requires_grad = True
dints_space.log_alpha_c.requires_grad = True
# linear increase topology and RAM loss
entropy_alpha_c = torch.tensor(0.).to(device)
entropy_alpha_a = torch.tensor(0.).to(device)
ram_cost_full = torch.tensor(0.).to(device)
ram_cost_usage = torch.tensor(0.).to(device)
ram_cost_loss = torch.tensor(0.).to(device)
topology_loss = torch.tensor(0.).to(device)
probs_a, arch_code_prob_a = dints_space.get_prob_a(child=True)
entropy_alpha_a = -((probs_a) * torch.log(probs_a + 1e-5)).mean()
entropy_alpha_c = -(F.softmax(dints_space.log_alpha_c, dim=-1) * \
F.log_softmax(dints_space.log_alpha_c, dim=-1)).mean()
topology_loss = dints_space.get_topology_entropy(probs_a)
ram_cost_full = dints_space.get_ram_cost_usage(inputs.shape,
full=True)
ram_cost_usage = dints_space.get_ram_cost_usage(inputs.shape)
ram_cost_loss = torch.abs(factor_ram_cost -
ram_cost_usage / ram_cost_full)
arch_optimizer_a.zero_grad()
arch_optimizer_c.zero_grad()
combination_weights = (epoch - num_epochs_warmup) / (
num_epochs - num_epochs_warmup)
if amp:
with autocast():
outputs_search = model(inputs_search)
if output_classes == 2:
loss = loss_func(torch.flip(outputs_search, dims=[1]),
1 - labels_search)
else:
loss = loss_func(outputs_search, labels_search)
loss += combination_weights * ((entropy_alpha_a + entropy_alpha_c) + ram_cost_loss \
+ 0.001 * topology_loss)
scaler.scale(loss).backward()
scaler.step(arch_optimizer_a)
scaler.step(arch_optimizer_c)
scaler.update()
else:
outputs_search = model(inputs_search)
if output_classes == 2:
loss = loss_func(torch.flip(outputs_search, dims=[1]),
1 - labels_search)
else:
loss = loss_func(outputs_search, labels_search)
loss += 1.0 * (combination_weights * (entropy_alpha_a + entropy_alpha_c) + ram_cost_loss \
+ 0.001 * topology_loss)
loss.backward()
arch_optimizer_a.step()
arch_optimizer_c.step()
epoch_loss_arch += loss.item()
loss_torch_arch[0] += loss.item()
loss_torch_arch[1] += 1.0
if dist.get_rank() == 0:
print(
"[{0}] ".format(str(datetime.now())[:19]) +
f"{step}/{epoch_len}, train_loss_arch: {loss.item():.4f}")
writer.add_scalar("train_loss_arch", loss.item(),
epoch_len * epoch + step)
# synchronizes all processes and reduce results
dist.barrier()
dist.all_reduce(loss_torch, op=torch.distributed.ReduceOp.SUM)
loss_torch = loss_torch.tolist()
loss_torch_arch = loss_torch_arch.tolist()
if dist.get_rank() == 0:
loss_torch_epoch = loss_torch[0] / loss_torch[1]
print(
f"epoch {epoch + 1} average loss: {loss_torch_epoch:.4f}, best mean dice: {best_metric:.4f} at epoch {best_metric_epoch}"
)
if epoch >= num_epochs_warmup:
loss_torch_arch_epoch = loss_torch_arch[0] / loss_torch_arch[1]
print(
f"epoch {epoch + 1} average arch loss: {loss_torch_arch_epoch:.4f}, best mean dice: {best_metric:.4f} at epoch {best_metric_epoch}"
)
if (epoch + 1) % val_interval == 0:
torch.cuda.empty_cache()
model.eval()
with torch.no_grad():
metric = torch.zeros((output_classes - 1) * 2,
dtype=torch.float,
device=device)
metric_sum = 0.0
metric_count = 0
metric_mat = []
val_images = None
val_labels = None
val_outputs = None
_index = 0
for val_data in val_loader:
val_images = val_data["image"].to(device)
val_labels = val_data["label"].to(device)
roi_size = patch_size_valid
sw_batch_size = num_sw_batch_size
if amp:
with torch.cuda.amp.autocast():
pred = sliding_window_inference(
val_images,
roi_size,
sw_batch_size,
lambda x: model(x),
mode="gaussian",
overlap=overlap_ratio,
)
else:
pred = sliding_window_inference(
val_images,
roi_size,
sw_batch_size,
lambda x: model(x),
mode="gaussian",
overlap=overlap_ratio,
)
val_outputs = pred
val_outputs = post_pred(val_outputs[0, ...])
val_outputs = val_outputs[None, ...]
val_labels = post_label(val_labels[0, ...])
val_labels = val_labels[None, ...]
value = compute_meandice(y_pred=val_outputs,
y=val_labels,
include_background=False)
print(_index + 1, "/", len(val_loader), value)
metric_count += len(value)
metric_sum += value.sum().item()
metric_vals = value.cpu().numpy()
if len(metric_mat) == 0:
metric_mat = metric_vals
else:
metric_mat = np.concatenate((metric_mat, metric_vals),
axis=0)
for _c in range(output_classes - 1):
val0 = torch.nan_to_num(value[0, _c], nan=0.0)
val1 = 1.0 - torch.isnan(value[0, 0]).float()
metric[2 * _c] += val0 * val1
metric[2 * _c + 1] += val1
_index += 1
# synchronizes all processes and reduce results
dist.barrier()
dist.all_reduce(metric, op=torch.distributed.ReduceOp.SUM)
metric = metric.tolist()
if dist.get_rank() == 0:
for _c in range(output_classes - 1):
print(
"evaluation metric - class {0:d}:".format(_c + 1),
metric[2 * _c] / metric[2 * _c + 1])
avg_metric = 0
for _c in range(output_classes - 1):
avg_metric += metric[2 * _c] / metric[2 * _c + 1]
avg_metric = avg_metric / float(output_classes - 1)
print("avg_metric", avg_metric)
if avg_metric > best_metric:
best_metric = avg_metric
best_metric_epoch = epoch + 1
best_metric_iterations = idx_iter
node_a_d, arch_code_a_d, arch_code_c_d, arch_code_a_max_d = dints_space.decode(
)
torch.save(
{
"node_a": node_a_d,
"arch_code_a": arch_code_a_d,
"arch_code_a_max": arch_code_a_max_d,
"arch_code_c": arch_code_c_d,
"iter_num": idx_iter,
"epochs": epoch + 1,
"best_dsc": best_metric,
"best_path": best_metric_iterations,
},
os.path.join(args.output_root,
"search_code_" + str(idx_iter) + ".pth"),
)
print("saved new best metric model")
dict_file = {}
dict_file["best_avg_dice_score"] = float(best_metric)
dict_file["best_avg_dice_score_epoch"] = int(
best_metric_epoch)
dict_file["best_avg_dice_score_iteration"] = int(idx_iter)
with open(os.path.join(args.output_root, "progress.yaml"),
"w") as out_file:
documents = yaml.dump(dict_file, stream=out_file)
print(
"current epoch: {} current mean dice: {:.4f} best mean dice: {:.4f} at epoch {}"
.format(epoch + 1, avg_metric, best_metric,
best_metric_epoch))
current_time = time.time()
elapsed_time = (current_time - start_time) / 60.0
with open(
os.path.join(args.output_root,
"accuracy_history.csv"), "a") as f:
f.write(
"{0:d}\t{1:.5f}\t{2:.5f}\t{3:.5f}\t{4:.1f}\t{5:d}\n"
.format(epoch + 1, avg_metric, loss_torch_epoch,
lr, elapsed_time, idx_iter))
dist.barrier()
torch.cuda.empty_cache()
print(
f"train completed, best_metric: {best_metric:.4f} at epoch: {best_metric_epoch}"
)
if dist.get_rank() == 0:
writer.close()
dist.destroy_process_group()
return
SpatialPadd(keys=("input", "mask"), spatial_size=(1120, 1120)),
RandFlipd(keys=("input", "mask"), prob=0.5, spatial_axis=1),
RandAffined(
keys=("input", "mask"),
prob=0.5,
rotate_range=np.pi / 14.4,
translate_range=(70, 70),
scale_range=(0.1, 0.1),
as_tensor_output=False,
),
RandSpatialCropd(
keys=("input", "mask"),
roi_size=(cfg.img_size[0], cfg.img_size[1]),
random_size=False,
),
RandScaleIntensityd(keys="input", factors=(-0.2, 0.2), prob=0.5),
RandShiftIntensityd(keys="input", offsets=(-51, 51), prob=0.5),
RandLambdad(keys="input", func=lambda x: 255 - x, prob=0.5),
RandCoarseDropoutd(
keys=("input", "mask"),
holes=8,
spatial_size=(1, 1),
max_spatial_size=(102, 102),
prob=0.5,
),
CastToTyped(keys="input", dtype=np.float32),
NormalizeIntensityd(keys="input", nonzero=False),
Lambdad(keys="input", func=lambda x: x.clip(-20, 20)),
EnsureTyped(keys=("input", "mask")),
])
# load 4 Nifti images and stack them together
LoadImaged(keys=["image", "label"]),
AsChannelFirstd(keys="image"),
ConvertToMultiChannelBasedOnBratsClassesd(keys="label"),
Spacingd(
keys=["image", "label"],
pixdim=(1.5, 1.5, 2.0),
mode=("bilinear", "nearest"),
),
Orientationd(keys=["image", "label"], axcodes="RAS"),
RandSpatialCropd(keys=["image", "label"],
roi_size=[128, 128, 64],
random_size=False),
RandFlipd(keys=["image", "label"], prob=0.5, spatial_axis=0),
NormalizeIntensityd(keys="image", nonzero=True, channel_wise=True),
RandScaleIntensityd(keys="image", factors=0.1, prob=0.5),
RandShiftIntensityd(keys="image", offsets=0.1, prob=0.5),
ToTensord(keys=["image", "label"]),
])
val_transform = Compose([
LoadImaged(keys=["image", "label"]),
AsChannelFirstd(keys="image"),
ConvertToMultiChannelBasedOnBratsClassesd(keys="label"),
Spacingd(
keys=["image", "label"],
pixdim=(1.5, 1.5, 2.0),
mode=("bilinear", "nearest"),
),
Orientationd(keys=["image", "label"], axcodes="RAS"),
CenterSpatialCropd(keys=["image", "label"], roi_size=[128, 128, 64]),
NormalizeIntensityd(keys="image", nonzero=True, channel_wise=True),