/
data_loader_training.py
433 lines (356 loc) · 20.4 KB
/
data_loader_training.py
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"""
Code to load data and to create batches of 2D slices from 3D images.
Info:
Dimensions order for DeepLearningBatchGenerator: (batch_size, channels, x, y, [z])
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from os.path import join
import random
import numpy as np
import nibabel as nib
from batchgenerators.transforms.resample_transforms import ResampleTransform
from batchgenerators.transforms.resample_transforms import SimulateLowResolutionTransform
from batchgenerators.transforms.noise_transforms import GaussianNoiseTransform
from batchgenerators.transforms.noise_transforms import GaussianBlurTransform
from batchgenerators.transforms.spatial_transforms import SpatialTransform
from batchgenerators.transforms.spatial_transforms import ZoomTransform
from batchgenerators.transforms.spatial_transforms import MirrorTransform
from batchgenerators.transforms.utility_transforms import NumpyToTensor
from batchgenerators.transforms.abstract_transforms import Compose
from batchgenerators.dataloading.multi_threaded_augmenter import MultiThreadedAugmenter
from batchgenerators.dataloading.data_loader import SlimDataLoaderBase
from batchgenerators.augmentations.utils import pad_nd_image
from batchgenerators.augmentations.utils import center_crop_2D_image_batched
from batchgenerators.augmentations.crop_and_pad_augmentations import crop
from batchgenerators.augmentations.spatial_transformations import augment_zoom
# from batchgenerators.transforms.sample_normalization_transforms import ZeroMeanUnitVarianceTransform
from tractseg.data.DLDABG_standalone import ZeroMeanUnitVarianceTransform as ZeroMeanUnitVarianceTransform_Standalone
from tractseg.data.custom_transformations import ResampleTransformLegacy
from tractseg.data.custom_transformations import FlipVectorAxisTransform
from tractseg.data.spatial_transform_peaks import SpatialTransformPeaks
from tractseg.data.spatial_transform_custom import SpatialTransformCustom
from tractseg.libs.system_config import SystemConfig as C
from tractseg.libs import data_utils
from tractseg.libs import peak_utils
def load_training_data(Config, subject):
"""
Load data and labels for one subject from the training set. Cut and scale to make them have
correct size.
Args:
Config: config class
subject: subject id (string)
Returns:
data and labels as 3D array
"""
def load(filepath):
data = nib.load(filepath + ".nii.gz").get_data()
# data = np.load(filepath + ".npy", mmap_mode="r")
return data
if Config.FEATURES_FILENAME == "12g90g270g":
rnd_choice = np.random.random()
if rnd_choice < 0.33:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_peaks"))
elif rnd_choice < 0.66:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "90g_125mm_peaks"))
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "12g_125mm_peaks"))
elif Config.FEATURES_FILENAME == "12g90g270gRaw32g":
rnd_choice = np.random.random()
if rnd_choice < 0.33:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_raw32g"))
elif rnd_choice < 0.66:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "90g_125mm_raw32g"))
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "12g_125mm_raw32g"))
elif Config.FEATURES_FILENAME == "12g90g270g_BX":
rnd_choice = np.random.random()
if rnd_choice < 0.33:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_bedpostx_peaks_scaled"))
elif rnd_choice < 0.66:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "90g_125mm_bedpostx_peaks_scaled"))
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "12g_125mm_bedpostx_peaks_scaled"))
elif Config.FEATURES_FILENAME == "12g90g270g_FA":
rnd_choice = np.random.random()
if rnd_choice < 0.33:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_FA"))
elif rnd_choice < 0.66:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "90g_125mm_FA"))
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "12g_125mm_FA"))
elif Config.FEATURES_FILENAME == "12g90g270g_CSD_BX":
rnd_choice_1 = np.random.random()
rnd_choice_2 = np.random.random()
if rnd_choice_1 < 0.5: # CSD
if rnd_choice_2 < 0.33:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_peaks"))
elif rnd_choice_2 < 0.66:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "90g_125mm_peaks"))
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "12g_125mm_peaks"))
else: # BX
if rnd_choice_2 < 0.33:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_bedpostx_peaks_scaled"))
elif rnd_choice_2 < 0.66:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "90g_125mm_bedpostx_peaks_scaled"))
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "12g_125mm_bedpostx_peaks_scaled"))
# Flip x axis to make BedpostX compatible with mrtrix CSD
data[:, :, :, 0] *= -1
data[:, :, :, 3] *= -1
data[:, :, :, 6] *= -1
elif Config.FEATURES_FILENAME == "32g90g270g_CSD_BX":
rnd_choice_1 = np.random.random()
rnd_choice_2 = np.random.random()
if rnd_choice_1 < 0.5: # CSD
if rnd_choice_2 < 0.33:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_peaks"))
elif rnd_choice_2 < 0.66:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "90g_125mm_peaks"))
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "32g_125mm_peaks"))
else: # BX
if rnd_choice_2 < 0.5:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_bedpostx_peaks_scaled"))
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "32g_125mm_bedpostx_peaks_scaled"))
# Flip x axis to make BedpostX compatible with mrtrix CSD
data[:, :, :, 0] *= -1
data[:, :, :, 3] *= -1
data[:, :, :, 6] *= -1
elif Config.FEATURES_FILENAME == "105g_CSD_BX":
rnd_choice_1 = np.random.random()
if rnd_choice_1 < 0.5: # CSD
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "105g_2mm_peaks"))
else: # BX
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "105g_2mm_bedpostx_peaks_scaled"))
# Flip x axis to make BedpostX compatible with mrtrix CSD
data[:, :, :, 0] *= -1
data[:, :, :, 3] *= -1
data[:, :, :, 6] *= -1
elif Config.FEATURES_FILENAME == "32g270g_BX":
rnd_choice = np.random.random()
path_32g = join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "32g_125mm_bedpostx_peaks_scaled")
if rnd_choice < 0.5:
data = load(path_32g)
rnd_choice_2 = np.random.random()
if rnd_choice_2 < 0.5:
data[:, :, :, 6:9] = 0 # set third peak to 0
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_bedpostx_peaks_scaled"))
elif Config.FEATURES_FILENAME == "T1_Peaks270g":
peaks = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_peaks"))
t1 = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "T1"))
data = np.concatenate((peaks, t1), axis=3)
elif Config.FEATURES_FILENAME == "T1_Peaks12g90g270g":
rnd_choice = np.random.random()
if rnd_choice < 0.33:
peaks = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "270g_125mm_peaks"))
elif rnd_choice < 0.66:
peaks = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "90g_125mm_peaks"))
else:
peaks = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "12g_125mm_peaks"))
t1 = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, "T1"))
data = np.concatenate((peaks, t1), axis=3)
else:
data = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, Config.FEATURES_FILENAME))
if "|" in Config.LABELS_FILENAME:
parts = Config.LABELS_FILENAME.split("|")
seg = [] # [4, x, y, z, 54]
for part in parts:
seg.append(load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, part)))
seg = np.array(seg).transpose(1, 2, 3, 4, 0)
seg = seg.reshape(data.shape[:3] + (-1,)) # [x, y, z, 54*4]
else:
seg = load(join(C.DATA_PATH, Config.DATASET_FOLDER, subject, Config.LABELS_FILENAME))
return data, seg
class BatchGenerator2D_Nifti_random(SlimDataLoaderBase):
"""
Randomly selects subjects and slices and creates batch of 2D slices.
Takes image IDs provided via self._data, randomly selects one ID,
loads the nifti image and randomly samples 2D slices from it.
Timing:
About 2s per 54-batch 45 bundles 1.25mm.
"""
def __init__(self, *args, **kwargs):
super(self.__class__, self).__init__(*args, **kwargs)
self.Config = None
def _zoom_x_and_y(self, x, y, zoom_factor):
# Very slow
x_new = []
y_new = []
for b in range(x.shape[0]):
x_tmp, y_tmp = augment_zoom(x[b], y[b], zoom_factor, order=3, order_seg=1, cval_seg=0)
x_new.append(x_tmp)
y_new.append(y_tmp)
return np.array(x_new), np.array(y_new)
def generate_train_batch(self):
subjects = self._data[0]
subject_idx = int(random.uniform(0, len(subjects)))
data, seg = load_training_data(self.Config, subjects[subject_idx])
# Convert peaks to tensors if tensor model
if self.Config.NR_OF_GRADIENTS == 18*self.Config.NR_SLICES:
data = peak_utils.peaks_to_tensors(data)
slice_direction = data_utils.slice_dir_to_int(self.Config.TRAINING_SLICE_DIRECTION)
if data.shape[slice_direction] <= self.batch_size:
print("INFO: Batch size bigger than nr of slices. Therefore sampling with replacement.")
slice_idxs = np.random.choice(data.shape[slice_direction], self.batch_size, True, None)
else:
slice_idxs = np.random.choice(data.shape[slice_direction], self.batch_size, False, None)
if self.Config.NR_SLICES > 1:
x, y = data_utils.sample_Xslices(data, seg, slice_idxs, slice_direction=slice_direction,
labels_type=self.Config.LABELS_TYPE, slice_window=self.Config.NR_SLICES)
else:
x, y = data_utils.sample_slices(data, seg, slice_idxs, slice_direction=slice_direction,
labels_type=self.Config.LABELS_TYPE)
# Can be replaced by crop
# x = pad_nd_image(x, self.Config.INPUT_DIM, mode='constant', kwargs={'constant_values': 0})
# y = pad_nd_image(y, self.Config.INPUT_DIM, mode='constant', kwargs={'constant_values': 0})
# x = center_crop_2D_image_batched(x, self.Config.INPUT_DIM)
# y = center_crop_2D_image_batched(y, self.Config.INPUT_DIM)
# If want to convert e.g. 1.25mm (HCP) image to 2mm image (bb)
# x, y = self._zoom_x_and_y(x, y, 0.67) # very slow -> try spatial_transform, should be fast
if self.Config.PAD_TO_SQUARE:
#Crop and pad to input size
x, y = crop(x, y, crop_size=self.Config.INPUT_DIM) # does not work with img with batches and channels
else:
# Works -> results as good?
# Will pad each axis to be multiple of 16. (Each sample can end up having different dimensions. Also x and y
# can be different)
# This is needed for Schizo dataset
x = pad_nd_image(x, shape_must_be_divisible_by=(16, 16), mode='constant', kwargs={'constant_values': 0})
y = pad_nd_image(y, shape_must_be_divisible_by=(16, 16), mode='constant', kwargs={'constant_values': 0})
# Does not make it slower
x = x.astype(np.float32)
y = y.astype(np.float32)
# possible optimization: sample slices from different patients and pad all to same size (size of biggest)
data_dict = {"data": x, # (batch_size, channels, x, y, [z])
"seg": y,
"slice_dir": slice_direction} # (batch_size, channels, x, y, [z])
return data_dict
class BatchGenerator2D_Npy_random(SlimDataLoaderBase):
"""
Takes image ID provided via self._data, loads the Npy (numpy array) image and randomly samples 2D slices from it.
Needed for fusion training.
Timing:
About 2s per 54-batch 45 bundles 1.25mm.
"""
def __init__(self, *args, **kwargs):
super(self.__class__, self).__init__(*args, **kwargs)
self.Config = None
def generate_train_batch(self):
subjects = self._data[0]
subject_idx = int(random.uniform(0, len(subjects)))
if self.Config.TYPE == "combined":
if np.random.random() < 0.5:
data = np.load(join(C.DATA_PATH, "HCP_fusion_npy_270g_125mm",
subjects[subject_idx], "270g_125mm_xyz.npy"), mmap_mode="r")
else:
data = np.load(join(C.DATA_PATH, "HCP_fusion_npy_32g_25mm",
subjects[subject_idx], "32g_25mm_xyz.npy"), mmap_mode="r")
data = np.reshape(data, (data.shape[0], data.shape[1], data.shape[2], data.shape[3] * data.shape[4]))
seg = np.load(join(C.DATA_PATH, self.Config.DATASET_FOLDER, subjects[subject_idx],
self.Config.LABELS_FILENAME + ".npy"), mmap_mode="r")
else:
data = np.load(join(C.DATA_PATH, self.Config.DATASET_FOLDER, subjects[subject_idx],
self.Config.FEATURES_FILENAME + ".npy"), mmap_mode="r")
seg = np.load(join(C.DATA_PATH, self.Config.DATASET_FOLDER, subjects[subject_idx],
self.Config.LABELS_FILENAME + ".npy"), mmap_mode="r")
data = np.nan_to_num(data)
seg = np.nan_to_num(seg)
slice_idxs = np.random.choice(data.shape[0], self.batch_size, False, None)
slice_direction = data_utils.slice_dir_to_int(self.Config.TRAINING_SLICE_DIRECTION)
x, y = data_utils.sample_slices(data, seg, slice_idxs,
slice_direction=slice_direction,
labels_type=self.Config.LABELS_TYPE)
data_dict = {"data": x, # (batch_size, channels, x, y, [z])
"seg": y} # (batch_size, channels, x, y, [z])
return data_dict
class DataLoaderTraining:
def __init__(self, Config):
self.Config = Config
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 = []
if self.Config.NORMALIZE_DATA:
# todo: Use original transform as soon as bug fixed in batchgenerators
# tfs.append(ZeroMeanUnitVarianceTransform(per_channel=self.Config.NORMALIZE_PER_CHANNEL))
tfs.append(ZeroMeanUnitVarianceTransform_Standalone(per_channel=self.Config.NORMALIZE_PER_CHANNEL))
if self.Config.SPATIAL_TRANSFORM == "SpatialTransformPeaks":
SpatialTransformUsed = SpatialTransformPeaks
elif self.Config.SPATIAL_TRANSFORM == "SpatialTransformCustom":
SpatialTransformUsed = SpatialTransformCustom
else:
SpatialTransformUsed = SpatialTransform
if self.Config.DATA_AUGMENTATION:
if type == "train":
# 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:
if self.Config.INPUT_RESCALING:
source_mm = 2 # for bb
target_mm = float(self.Config.RESOLUTION[:-2])
scale_factor = target_mm / source_mm
scale = (scale_factor, scale_factor)
else:
scale = (0.9, 1.5)
if self.Config.PAD_TO_SQUARE:
patch_size = self.Config.INPUT_DIM
else:
patch_size = None # keeps dimensions of the data
# 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(SpatialTransformUsed(patch_size,
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=self.Config.DAUG_ROTATE_ANGLE,
angle_y=self.Config.DAUG_ROTATE_ANGLE,
angle_z=self.Config.DAUG_ROTATE_ANGLE,
do_scale=True, scale=scale, 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)
def get_batch_generator(self, batch_size=128, type=None, subjects=None):
data = subjects
seg = []
if self.Config.TYPE == "combined":
batch_gen = BatchGenerator2D_Npy_random((data, seg), batch_size=batch_size)
else:
batch_gen = BatchGenerator2D_Nifti_random((data, seg), batch_size=batch_size)
# batch_gen = SlicesBatchGeneratorRandomNiftiImg_5slices((data, seg), batch_size=batch_size)
batch_gen.Config = self.Config
batch_gen = self._augment_data(batch_gen, type=type)
return batch_gen