def get_batches(self,
batch_size=128,
type=None,
subjects=None,
num_batches=None):
data = subjects
seg = []
#6 -> >30GB RAM
if self.HP.DATA_AUGMENTATION:
num_processes = 8 # 6 is a bit faster than 16
else:
num_processes = 6
nr_of_samples = len(subjects) * self.HP.INPUT_DIM[0]
if num_batches is None:
num_batches_multithr = int(
nr_of_samples / batch_size /
num_processes) #number of batches for exactly one epoch
else:
num_batches_multithr = int(num_batches / num_processes)
if self.HP.TYPE == "combined":
# Simple with .npy -> just a little bit faster than Nifti (<10%) and f1 not better => use Nifti
# batch_gen = SlicesBatchGeneratorRandomNpyImg_fusion((data, seg), batch_size=batch_size)
batch_gen = SlicesBatchGeneratorRandomNpyImg_fusion(
(data, seg), batch_size=batch_size)
else:
batch_gen = SlicesBatchGeneratorRandomNiftiImg(
(data, seg), batch_size=batch_size)
# batch_gen = SlicesBatchGeneratorRandomNiftiImg_5slices((data, seg), batch_size=batch_size)
batch_gen.HP = self.HP
tfs = [] #transforms
if self.HP.NORMALIZE_DATA:
tfs.append(
ZeroMeanUnitVarianceTransform(
per_channel=self.HP.NORMALIZE_PER_CHANNEL))
if self.HP.DATASET == "Schizo" and self.HP.RESOLUTION == "2mm":
tfs.append(PadToMultipleTransform(16))
if self.HP.DATA_AUGMENTATION:
if type == "train":
# scale: inverted: 0.5 -> bigger; 2 -> smaller
# patch_center_dist_from_border: if 144/2=72 -> always exactly centered; otherwise a bit off center (brain can get off image and will be cut then)
if self.HP.DAUG_SCALE:
center_dist_from_border = int(
self.HP.INPUT_DIM[0] / 2.) - 10 # (144,144) -> 62
tfs.append(
SpatialTransform(
self.HP.INPUT_DIM,
patch_center_dist_from_border=
center_dist_from_border,
do_elastic_deform=self.HP.DAUG_ELASTIC_DEFORM,
alpha=(90., 120.),
sigma=(9., 11.),
do_rotation=self.HP.DAUG_ROTATE,
angle_x=(-0.8, 0.8),
angle_y=(-0.8, 0.8),
angle_z=(-0.8, 0.8),
do_scale=True,
scale=(0.9, 1.5),
border_mode_data='constant',
border_cval_data=0,
order_data=3,
border_mode_seg='constant',
border_cval_seg=0,
order_seg=0,
random_crop=True))
if self.HP.DAUG_RESAMPLE:
tfs.append(ResampleTransform(zoom_range=(0.5, 1)))
if self.HP.DAUG_NOISE:
tfs.append(GaussianNoiseTransform(noise_variance=(0,
0.05)))
if self.HP.DAUG_MIRROR:
tfs.append(MirrorTransform())
if self.HP.DAUG_FLIP_PEAKS:
tfs.append(FlipVectorAxisTransform())
#num_cached_per_queue 1 or 2 does not really make a difference
batch_gen = MultiThreadedAugmenter(batch_gen,
Compose(tfs),
num_processes=num_processes,
num_cached_per_queue=1,
seeds=None)
return batch_gen # data: (batch_size, channels, x, y), seg: (batch_size, channels, x, y)
def _augment_data(self, batch_generator, type=None):
if self.Config.DATA_AUGMENTATION:
num_processes = 16 # 2D: 8 is a bit faster than 16
else:
num_processes = 6
tfs = [] #transforms
if self.Config.NORMALIZE_DATA:
tfs.append(
ZeroMeanUnitVarianceTransform(
per_channel=self.Config.NORMALIZE_PER_CHANNEL))
if self.Config.DATASET == "Schizo" and self.Config.RESOLUTION == "2mm":
tfs.append(PadToMultipleTransform(16))
if self.Config.DATA_AUGMENTATION:
if type == "train":
# scale: inverted: 0.5 -> bigger; 2 -> smaller
# patch_center_dist_from_border: if 144/2=72 -> always exactly centered; otherwise a bit off center (brain can get off image and will be cut then)
if self.Config.DAUG_SCALE:
center_dist_from_border = int(
self.Config.INPUT_DIM[0] / 2.) - 10 # (144,144) -> 62
tfs.append(
SpatialTransform(
self.Config.INPUT_DIM,
patch_center_dist_from_border=
center_dist_from_border,
do_elastic_deform=self.Config.DAUG_ELASTIC_DEFORM,
alpha=(90., 120.),
sigma=(9., 11.),
do_rotation=self.Config.DAUG_ROTATE,
angle_x=(-0.8, 0.8),
angle_y=(-0.8, 0.8),
angle_z=(-0.8, 0.8),
do_scale=True,
scale=(0.9, 1.5),
border_mode_data='constant',
border_cval_data=0,
order_data=3,
border_mode_seg='constant',
border_cval_seg=0,
order_seg=0,
random_crop=True))
if self.Config.DAUG_RESAMPLE:
tfs.append(ResampleTransform(zoom_range=(0.5, 1)))
if self.Config.DAUG_NOISE:
tfs.append(GaussianNoiseTransform(noise_variance=(0,
0.05)))
if self.Config.DAUG_MIRROR:
tfs.append(MirrorTransform())
if self.Config.DAUG_FLIP_PEAKS:
tfs.append(FlipVectorAxisTransform())
#num_cached_per_queue 1 or 2 does not really make a difference
batch_gen = MultiThreadedAugmenter(batch_generator,
Compose(tfs),
num_processes=num_processes,
num_cached_per_queue=1,
seeds=None)
return batch_gen # data: (batch_size, channels, x, y), seg: (batch_size, channels, x, y)
def _augment_data(self, batch_generator, type=None):
if self.Config.DATA_AUGMENTATION:
num_processes = 15 # 15 is a bit faster than 8 on cluster
# num_processes = multiprocessing.cpu_count() # on cluster: gives all cores, not only assigned cores
else:
num_processes = 6
tfs = [] #transforms
if self.Config.NORMALIZE_DATA:
tfs.append(ZeroMeanUnitVarianceTransform(per_channel=self.Config.NORMALIZE_PER_CHANNEL))
if self.Config.DATA_AUGMENTATION:
if type == "train":
# scale: inverted: 0.5 -> bigger; 2 -> smaller
# patch_center_dist_from_border: if 144/2=72 -> always exactly centered; otherwise a bit off center
# (brain can get off image and will be cut then)
if self.Config.DAUG_SCALE:
# spatial transform automatically crops/pads to correct size
center_dist_from_border = int(self.Config.INPUT_DIM[0] / 2.) - 10 # (144,144) -> 62
tfs.append(SpatialTransform(self.Config.INPUT_DIM,
patch_center_dist_from_border=center_dist_from_border,
do_elastic_deform=self.Config.DAUG_ELASTIC_DEFORM,
alpha=self.Config.DAUG_ALPHA, sigma=self.Config.DAUG_SIGMA,
do_rotation=self.Config.DAUG_ROTATE,
angle_x=(-0.8, 0.8), angle_y=(-0.8, 0.8), angle_z=(-0.8, 0.8),
do_scale=True, scale=(0.9, 1.5), border_mode_data='constant',
border_cval_data=0,
order_data=3,
border_mode_seg='constant', border_cval_seg=0,
order_seg=0, random_crop=True,
p_el_per_sample=self.Config.P_SAMP,
p_rot_per_sample=self.Config.P_SAMP,
p_scale_per_sample=self.Config.P_SAMP))
if self.Config.DAUG_RESAMPLE:
tfs.append(SimulateLowResolutionTransform(zoom_range=(0.5, 1), p_per_sample=0.2, per_channel=False))
if self.Config.DAUG_RESAMPLE_LEGACY:
tfs.append(ResampleTransformLegacy(zoom_range=(0.5, 1)))
if self.Config.DAUG_GAUSSIAN_BLUR:
tfs.append(GaussianBlurTransform(blur_sigma=self.Config.DAUG_BLUR_SIGMA,
different_sigma_per_channel=False,
p_per_sample=self.Config.P_SAMP))
if self.Config.DAUG_NOISE:
tfs.append(GaussianNoiseTransform(noise_variance=self.Config.DAUG_NOISE_VARIANCE,
p_per_sample=self.Config.P_SAMP))
if self.Config.DAUG_MIRROR:
tfs.append(MirrorTransform())
if self.Config.DAUG_FLIP_PEAKS:
tfs.append(FlipVectorAxisTransform())
tfs.append(NumpyToTensor(keys=["data", "seg"], cast_to="float"))
#num_cached_per_queue 1 or 2 does not really make a difference
batch_gen = MultiThreadedAugmenter(batch_generator, Compose(tfs), num_processes=num_processes,
num_cached_per_queue=1, seeds=None, pin_memory=True)
return batch_gen # data: (batch_size, channels, x, y), seg: (batch_size, channels, x, y)