torchio.utils.check_uint_to_int() - Code Metrics - Inspection of "Remove checks and casts to float32 (#380)" - fepegar/torchio - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 0bdb47...b0bac6 )

by Fernando

created 2020-12-13 21:42 UTC

torchio.utils.check_uint_to_int() A

↳ Parent: torchio.utils

Complexity

Conditions

Size

Total Lines	7
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
eloc	6
nop	1
dl	0
loc	7
rs	10
c	0
b	0
f	0

import os
import ast
import gzip
import shutil
import tempfile
from pathlib import Path
from typing import Union, Iterable, Tuple, Any, Optional, List, Sequence

from torch.utils.data._utils.collate import default_collate
import numpy as np
import nibabel as nib
import SimpleITK as sitk
from tqdm import trange

from .torchio import (
    INTENSITY,
    TypeData,
    TypeNumber,
    TypePath,
    REPO_URL,
)


FLIP_XY = np.diag((-1, -1, 1))  # used to switch between LPS and RAS


def to_tuple(
        value: Union[TypeNumber, Iterable[TypeNumber]],
        length: int = 1,
        ) -> Tuple[TypeNumber, ...]:
    """
    to_tuple(1, length=1) -> (1,)
    to_tuple(1, length=3) -> (1, 1, 1)

    If value is an iterable, n is ignored and tuple(value) is returned
    to_tuple((1,), length=1) -> (1,)
    to_tuple((1, 2), length=1) -> (1, 2)
    to_tuple([1, 2], length=3) -> (1, 2)
    """
    try:
        iter(value)
        value = tuple(value)
    except TypeError:
        value = length * (value,)
    return value


def get_stem(
        path: Union[TypePath, List[TypePath]]
        ) -> Union[str, List[str]]:
    """
    '/home/user/image.nii.gz' -> 'image'
    """
    def _get_stem(path_string):
        return Path(path_string).name.split('.')[0]
    if isinstance(path, (str, Path)):
        return _get_stem(path)
    return [_get_stem(p) for p in path]


def create_dummy_dataset(
        num_images: int,
        size_range: Tuple[int, int],
        directory: Optional[TypePath] = None,
        suffix: str = '.nii.gz',
        force: bool = False,
        verbose: bool = False,
        ):
    from .data import ScalarImage, LabelMap, Subject
    output_dir = tempfile.gettempdir() if directory is None else directory
    output_dir = Path(output_dir)
    images_dir = output_dir / 'dummy_images'
    labels_dir = output_dir / 'dummy_labels'

    if force:
        shutil.rmtree(images_dir)
        shutil.rmtree(labels_dir)

    subjects: List[Subject] = []
    if images_dir.is_dir():
        for i in trange(num_images):
            image_path = images_dir / f'image_{i}{suffix}'
            label_path = labels_dir / f'label_{i}{suffix}'
            subject = Subject(
                one_modality=ScalarImage(image_path),
                segmentation=LabelMap(label_path),
            )
            subjects.append(subject)
    else:
        images_dir.mkdir(exist_ok=True, parents=True)
        labels_dir.mkdir(exist_ok=True, parents=True)
        if verbose:
            print('Creating dummy dataset...')  # noqa: T001
            iterable = trange(num_images)
        else:
            iterable = range(num_images)
        for i in iterable:
            shape = np.random.randint(*size_range, size=3)
            affine = np.eye(4)
            image = np.random.rand(*shape)
            label = np.ones_like(image)
            label[image < 0.33] = 0
            label[image > 0.66] = 2
            image *= 255

            image_path = images_dir / f'image_{i}{suffix}'
            nii = nib.Nifti1Image(image.astype(np.uint8), affine)
            nii.to_filename(str(image_path))

            label_path = labels_dir / f'label_{i}{suffix}'
            nii = nib.Nifti1Image(label.astype(np.uint8), affine)
            nii.to_filename(str(label_path))

            subject = Subject(
                one_modality=ScalarImage(image_path),
                segmentation=LabelMap(label_path),
            )
            subjects.append(subject)
    return subjects


def apply_transform_to_file(
        input_path: TypePath,
        transform,  # : Transform seems to create a circular import
        output_path: TypePath,
        type: str = INTENSITY,  # noqa: A002
        verbose: bool = False,
        ):
    from . import Image, Subject
    subject = Subject(image=Image(input_path, type=type))
    transformed = transform(subject)
    transformed.image.save(output_path)
    if verbose and transformed.history:
        print('Applied transform:', transformed.history[0])  # noqa: T001


def guess_type(string: str) -> Any:
    # Adapted from
    # https://www.reddit.com/r/learnpython/comments/4599hl/module_to_guess_type_from_a_string/czw3f5s
    string = string.replace(' ', '')
    try:
        value = ast.literal_eval(string)
    except ValueError:
        result_type = str
    else:
        result_type = type(value)
    if result_type in (list, tuple):
        string = string[1:-1]  # remove brackets
        split = string.split(',')
        list_result = [guess_type(n) for n in split]
        value = tuple(list_result) if result_type is tuple else list_result
        return value
    try:
        value = result_type(string)
    except TypeError:
        value = None
    return value


def get_rotation_and_spacing_from_affine(
        affine: np.ndarray,
        ) -> Tuple[np.ndarray, np.ndarray]:
    # From https://github.com/nipy/nibabel/blob/master/nibabel/orientations.py
    rotation_zoom = affine[:3, :3]
    spacing = np.sqrt(np.sum(rotation_zoom * rotation_zoom, axis=0))
    rotation = rotation_zoom / spacing
    return rotation, spacing


def nib_to_sitk(
        data: TypeData,
        affine: TypeData,
        squeeze: bool = False,
        force_3d: bool = False,
        force_4d: bool = False,
        ) -> sitk.Image:
    """Create a SimpleITK image from a tensor and a 4x4 affine matrix."""
    if data.ndim != 4:
        raise ValueError(f'Input must be 4D, but has shape {tuple(data.shape)}')
    # Possibilities
    # (1, w, h, 1)
    # (c, w, h, 1)
    # (1, w, h, 1)
    # (c, w, h, d)
    array = np.asarray(data)
    affine = np.asarray(affine).astype(np.float64)

    is_multichannel = array.shape[0] > 1 and not force_4d
    is_2d = array.shape[3] == 1 and not force_3d
    if is_2d:
        array = array[..., 0]
    if not is_multichannel and not force_4d:
        array = array[0]
    array = array.transpose()  # (W, H, D, C) or (W, H, D)
    image = sitk.GetImageFromArray(array, isVector=is_multichannel)

    rotation, spacing = get_rotation_and_spacing_from_affine(affine)
    origin = np.dot(FLIP_XY, affine[:3, 3])
    direction = np.dot(FLIP_XY, rotation)
    if is_2d:  # ignore first dimension if 2D (1, W, H, 1)
        direction = direction[:2, :2]
    image.SetOrigin(origin)  # should I add a 4th value if force_4d?
    image.SetSpacing(spacing)
    image.SetDirection(direction.flatten())
    if data.ndim == 4:
        assert image.GetNumberOfComponentsPerPixel() == data.shape[0]
    num_spatial_dims = 2 if is_2d else 3
    assert image.GetSize() == data.shape[1: 1 + num_spatial_dims]
    return image


def sitk_to_nib(
        image: sitk.Image,
        keepdim: bool = False,
        ) -> Tuple[np.ndarray, np.ndarray]:
    data = sitk.GetArrayFromImage(image).transpose()
    num_components = image.GetNumberOfComponentsPerPixel()
    if num_components == 1:
        data = data[np.newaxis]  # add channels dimension
    input_spatial_dims = image.GetDimension()
    if input_spatial_dims == 2:
        data = data[..., np.newaxis]
    if not keepdim:
        data = ensure_4d(data, num_spatial_dims=input_spatial_dims)
    assert data.shape[0] == num_components
    assert data.shape[1: 1 + input_spatial_dims] == image.GetSize()
    spacing = np.array(image.GetSpacing())
    direction = np.array(image.GetDirection())
    origin = image.GetOrigin()
    if len(direction) == 9:
        rotation = direction.reshape(3, 3)
    elif len(direction) == 4:  # ignore first dimension if 2D (1, W, H, 1)
        rotation_2d = direction.reshape(2, 2)
        rotation = np.eye(3)
        rotation[:2, :2] = rotation_2d
        spacing = *spacing, 1
        origin = *origin, 0
    else:
        raise RuntimeError(f'Direction not understood: {direction}')
    rotation = np.dot(FLIP_XY, rotation)
    rotation_zoom = rotation * spacing
    translation = np.dot(FLIP_XY, origin)
    affine = np.eye(4)
    affine[:3, :3] = rotation_zoom
    affine[:3, 3] = translation
    return data, affine


def ensure_4d(tensor: TypeData, num_spatial_dims=None) -> TypeData:
    # I wish named tensors were properly supported in PyTorch
    num_dimensions = tensor.ndim
    if num_dimensions == 4:
        pass
    elif num_dimensions == 5:  # hope (W, H, D, 1, C)
        if tensor.shape[-2] == 1:
            tensor = tensor[..., 0, :]
            tensor = tensor.permute(3, 0, 1, 2)
        else:
            raise ValueError('5D is not supported for shape[-2] > 1')
    elif num_dimensions == 2:  # assume 2D monochannel (W, H)
        tensor = tensor[np.newaxis, ..., np.newaxis]  # (1, W, H, 1)
    elif num_dimensions == 3:  # 2D multichannel or 3D monochannel?
        if num_spatial_dims == 2:
            tensor = tensor[..., np.newaxis]  # (C, W, H, 1)
        elif num_spatial_dims == 3:  # (W, H, D)
            tensor = tensor[np.newaxis]  # (1, W, H, D)
        else:  # try to guess
            shape = tensor.shape
            maybe_rgb = 3 in (shape[0], shape[-1])
            if maybe_rgb:
                if shape[-1] == 3:  # (W, H, 3)
                    tensor = tensor.permute(2, 0, 1)  # (3, W, H)
                tensor = tensor[..., np.newaxis]  # (3, W, H, 1)
            else:  # (W, H, D)
                tensor = tensor[np.newaxis]  # (1, W, H, D)
    else:
        message = (
            f'{num_dimensions}D images not supported yet. Please create an'
            f' issue in {REPO_URL} if you would like support for them'
        )
        raise ValueError(message)
    assert tensor.ndim == 4
    return tensor


def get_torchio_cache_dir():
    return Path('~/.cache/torchio').expanduser()


def round_up(value: float) -> int:
    """Round half towards infinity.

    Args:
        value: The value to round.

    Example:

        >>> round(2.5)
        2
        >>> round(3.5)
        4
        >>> round_up(2.5)
        3
        >>> round_up(3.5)
        4

    """
    return int(np.floor(value + 0.5))


def compress(input_path, output_path):
    with open(input_path, 'rb') as f_in:
        with gzip.open(output_path, 'wb') as f_out:
            shutil.copyfileobj(f_in, f_out)


def check_sequence(sequence: Sequence, name: str):
    try:
        iter(sequence)
    except TypeError:
        message = f'"{name}" must be a sequence, not {type(name)}'
        raise TypeError(message)


def get_major_sitk_version() -> int:
    # This attribute was added in version 2
    # https://github.com/SimpleITK/SimpleITK/pull/1171
    version = getattr(sitk, '__version__', None)
    major_version = 1 if version is None else 2
    return major_version


def history_collate(batch: Sequence, collate_transforms=True):
    attr = 'history' if collate_transforms else 'applied_transforms'
    # Adapted from
    # https://github.com/romainVala/torchQC/blob/master/segmentation/collate_functions.py
    from .data import Subject
    first_element = batch[0]
    if isinstance(first_element, Subject):
        dictionary = {
            key: default_collate([d[key] for d in batch])
            for key in first_element
        }
        if hasattr(first_element, attr):
            dictionary.update({attr: [getattr(d, attr) for d in batch]})
        return dictionary


# Adapted from torchvision, removing print statements
def download_and_extract_archive(
        url: str,
        download_root: TypePath,
        extract_root: Optional[TypePath] = None,
        filename: Optional[TypePath] = None,
        md5: str = None,
        remove_finished: bool = False,
        ) -> None:
    download_root = os.path.expanduser(download_root)
    if extract_root is None:
        extract_root = download_root
    if not filename:
        filename = os.path.basename(url)
    download_url(url, download_root, filename, md5)
    archive = os.path.join(download_root, filename)
    from torchvision.datasets.utils import extract_archive
    extract_archive(archive, extract_root, remove_finished)


# Adapted from torchvision, removing print statements
def download_url(
        url: str,
        root: TypePath,
        filename: Optional[TypePath] = None,
        md5: str = None,
        ) -> None:
    """Download a file from a url and place it in root.

    Args:
        url: URL to download file from
        root: Directory to place downloaded file in
        filename: Name to save the file under.
            If ``None``, use the basename of the URL
        md5: MD5 checksum of the download. If None, do not check
    """
    import urllib
    from torchvision.datasets.utils import check_integrity, gen_bar_updater

    root = os.path.expanduser(root)
    if not filename:
        filename = os.path.basename(url)
    fpath = os.path.join(root, filename)
    os.makedirs(root, exist_ok=True)
    # check if file is already present locally
    if not check_integrity(fpath, md5):
        try:
            print('Downloading ' + url + ' to ' + fpath)  # noqa: T001
            urllib.request.urlretrieve(
                url, fpath,
                reporthook=gen_bar_updater()
            )
        except (urllib.error.URLError, OSError) as e:
            if url[:5] == 'https':
                url = url.replace('https:', 'http:')
                message = (
                    'Failed download. Trying https -> http instead.'
                    ' Downloading ' + url + ' to ' + fpath
                )
                print(message)  # noqa: T001
                urllib.request.urlretrieve(
                    url, fpath,
                    reporthook=gen_bar_updater()
                )
            else:
                raise e
        # check integrity of downloaded file
        if not check_integrity(fpath, md5):
            raise RuntimeError('File not found or corrupted.')


def check_uint_to_int(array):
    # This is because PyTorch won't take uint16 nor uint32
    if array.dtype == np.uint16:
        return array.astype(np.int32)
    if array.dtype == np.uint32:
        return array.astype(np.int64)
    return array


1			import os
2			import ast
3			import gzip
4			import shutil
5			import tempfile
6			from pathlib import Path
7			from typing import Union, Iterable, Tuple, Any, Optional, List, Sequence
8
9			from torch.utils.data._utils.collate import default_collate
10			import numpy as np
11			import nibabel as nib
12			import SimpleITK as sitk
13			from tqdm import trange
14
15			from .torchio import (
16			INTENSITY,
17			TypeData,
18			TypeNumber,
19			TypePath,
20			REPO_URL,
21			)
22
23
24			FLIP_XY = np.diag((-1, -1, 1)) # used to switch between LPS and RAS
25
26
27			def to_tuple(
28			value: Union[TypeNumber, Iterable[TypeNumber]],
29			length: int = 1,
30			) -> Tuple[TypeNumber, ...]:
31			"""
32			to_tuple(1, length=1) -> (1,)
33			to_tuple(1, length=3) -> (1, 1, 1)
34
35			If value is an iterable, n is ignored and tuple(value) is returned
36			to_tuple((1,), length=1) -> (1,)
37			to_tuple((1, 2), length=1) -> (1, 2)
38			to_tuple([1, 2], length=3) -> (1, 2)
39			"""
40			try:
41			iter(value)
42			value = tuple(value)
43			except TypeError:
44			value = length * (value,)
45			return value
46
47
48			def get_stem(
49			path: Union[TypePath, List[TypePath]]
50			) -> Union[str, List[str]]:
51			"""
52			'/home/user/image.nii.gz' -> 'image'
53			"""
54			def _get_stem(path_string):
55			return Path(path_string).name.split('.')[0]
56			if isinstance(path, (str, Path)):
57			return _get_stem(path)
58			return [_get_stem(p) for p in path]
59
60
61			def create_dummy_dataset(
62			num_images: int,
63			size_range: Tuple[int, int],
64			directory: Optional[TypePath] = None,
65			suffix: str = '.nii.gz',
66			force: bool = False,
67			verbose: bool = False,
68			):
69			from .data import ScalarImage, LabelMap, Subject
70			output_dir = tempfile.gettempdir() if directory is None else directory
71			output_dir = Path(output_dir)
72			images_dir = output_dir / 'dummy_images'
73			labels_dir = output_dir / 'dummy_labels'
74
75			if force:
76			shutil.rmtree(images_dir)
77			shutil.rmtree(labels_dir)
78
79			subjects: List[Subject] = []
80			if images_dir.is_dir():
81			for i in trange(num_images):
82			image_path = images_dir / f'image_{i}{suffix}'
83			label_path = labels_dir / f'label_{i}{suffix}'
84			subject = Subject(
85			one_modality=ScalarImage(image_path),
86			segmentation=LabelMap(label_path),
87			)
88			subjects.append(subject)
89			else:
90			images_dir.mkdir(exist_ok=True, parents=True)
91			labels_dir.mkdir(exist_ok=True, parents=True)
92			if verbose:
93			print('Creating dummy dataset...') # noqa: T001
94			iterable = trange(num_images)
95			else:
96			iterable = range(num_images)
97			for i in iterable:
98			shape = np.random.randint(*size_range, size=3)
99			affine = np.eye(4)
100			image = np.random.rand(*shape)
101			label = np.ones_like(image)
102			label[image < 0.33] = 0
103			label[image > 0.66] = 2
104			image *= 255
105
106			image_path = images_dir / f'image_{i}{suffix}'
107			nii = nib.Nifti1Image(image.astype(np.uint8), affine)
108			nii.to_filename(str(image_path))
109
110			label_path = labels_dir / f'label_{i}{suffix}'
111			nii = nib.Nifti1Image(label.astype(np.uint8), affine)
112			nii.to_filename(str(label_path))
113
114			subject = Subject(
115			one_modality=ScalarImage(image_path),
116			segmentation=LabelMap(label_path),
117			)
118			subjects.append(subject)
119			return subjects
120
121
122			def apply_transform_to_file(
123			input_path: TypePath,
124			transform, # : Transform seems to create a circular import
125			output_path: TypePath,
126			type: str = INTENSITY, # noqa: A002
127			verbose: bool = False,
128			):
129			from . import Image, Subject
130			subject = Subject(image=Image(input_path, type=type))
131			transformed = transform(subject)
132			transformed.image.save(output_path)
133			if verbose and transformed.history:
134			print('Applied transform:', transformed.history[0]) # noqa: T001
135
136
137			def guess_type(string: str) -> Any:
138			# Adapted from
139			# https://www.reddit.com/r/learnpython/comments/4599hl/module_to_guess_type_from_a_string/czw3f5s
140			string = string.replace(' ', '')
141			try:
142			value = ast.literal_eval(string)
143			except ValueError:
144			result_type = str
145			else:
146			result_type = type(value)
147			if result_type in (list, tuple):
148			string = string[1:-1] # remove brackets
149			split = string.split(',')
150			list_result = [guess_type(n) for n in split]
151			value = tuple(list_result) if result_type is tuple else list_result
152			return value
153			try:
154			value = result_type(string)
155			except TypeError:
156			value = None
157			return value
158
159
160			def get_rotation_and_spacing_from_affine(
161			affine: np.ndarray,
162			) -> Tuple[np.ndarray, np.ndarray]:
163			# From https://github.com/nipy/nibabel/blob/master/nibabel/orientations.py
164			rotation_zoom = affine[:3, :3]
165			spacing = np.sqrt(np.sum(rotation_zoom * rotation_zoom, axis=0))
166			rotation = rotation_zoom / spacing
167			return rotation, spacing
168
169
170			def nib_to_sitk(
171			data: TypeData,
172			affine: TypeData,
173			squeeze: bool = False,
174			force_3d: bool = False,
175			force_4d: bool = False,
176			) -> sitk.Image:
177			"""Create a SimpleITK image from a tensor and a 4x4 affine matrix."""
178			if data.ndim != 4:
179			raise ValueError(f'Input must be 4D, but has shape {tuple(data.shape)}')
180			# Possibilities
181			# (1, w, h, 1)
182			# (c, w, h, 1)
183			# (1, w, h, 1)
184			# (c, w, h, d)
185			array = np.asarray(data)
186			affine = np.asarray(affine).astype(np.float64)
187
188			is_multichannel = array.shape[0] > 1 and not force_4d
189			is_2d = array.shape[3] == 1 and not force_3d
190			if is_2d:
191			array = array[..., 0]
192			if not is_multichannel and not force_4d:
193			array = array[0]
194			array = array.transpose() # (W, H, D, C) or (W, H, D)
195			image = sitk.GetImageFromArray(array, isVector=is_multichannel)
196
197			rotation, spacing = get_rotation_and_spacing_from_affine(affine)
198			origin = np.dot(FLIP_XY, affine[:3, 3])
199			direction = np.dot(FLIP_XY, rotation)
200			if is_2d: # ignore first dimension if 2D (1, W, H, 1)
201			direction = direction[:2, :2]
202			image.SetOrigin(origin) # should I add a 4th value if force_4d?
203			image.SetSpacing(spacing)
204			image.SetDirection(direction.flatten())
205			if data.ndim == 4:
206			assert image.GetNumberOfComponentsPerPixel() == data.shape[0]
207			num_spatial_dims = 2 if is_2d else 3
208			assert image.GetSize() == data.shape[1: 1 + num_spatial_dims]
209			return image
210
211
212			def sitk_to_nib(
213			image: sitk.Image,
214			keepdim: bool = False,
215			) -> Tuple[np.ndarray, np.ndarray]:
216			data = sitk.GetArrayFromImage(image).transpose()
217			num_components = image.GetNumberOfComponentsPerPixel()
218			if num_components == 1:
219			data = data[np.newaxis] # add channels dimension
220			input_spatial_dims = image.GetDimension()
221			if input_spatial_dims == 2:
222			data = data[..., np.newaxis]
223			if not keepdim:
224			data = ensure_4d(data, num_spatial_dims=input_spatial_dims)
225			assert data.shape[0] == num_components
226			assert data.shape[1: 1 + input_spatial_dims] == image.GetSize()
227			spacing = np.array(image.GetSpacing())
228			direction = np.array(image.GetDirection())
229			origin = image.GetOrigin()
230			if len(direction) == 9:
231			rotation = direction.reshape(3, 3)
232			elif len(direction) == 4: # ignore first dimension if 2D (1, W, H, 1)
233			rotation_2d = direction.reshape(2, 2)
234			rotation = np.eye(3)
235			rotation[:2, :2] = rotation_2d
236			spacing = *spacing, 1
237			origin = *origin, 0
238			else:
239			raise RuntimeError(f'Direction not understood: {direction}')
240			rotation = np.dot(FLIP_XY, rotation)
241			rotation_zoom = rotation * spacing
242			translation = np.dot(FLIP_XY, origin)
243			affine = np.eye(4)
244			affine[:3, :3] = rotation_zoom
245			affine[:3, 3] = translation
246			return data, affine
247
248
249			def ensure_4d(tensor: TypeData, num_spatial_dims=None) -> TypeData:
250			# I wish named tensors were properly supported in PyTorch
251			num_dimensions = tensor.ndim
252			if num_dimensions == 4:
253			pass
254			elif num_dimensions == 5: # hope (W, H, D, 1, C)
255			if tensor.shape[-2] == 1:
256			tensor = tensor[..., 0, :]
257			tensor = tensor.permute(3, 0, 1, 2)
258			else:
259			raise ValueError('5D is not supported for shape[-2] > 1')
260			elif num_dimensions == 2: # assume 2D monochannel (W, H)
261			tensor = tensor[np.newaxis, ..., np.newaxis] # (1, W, H, 1)
262			elif num_dimensions == 3: # 2D multichannel or 3D monochannel?
263			if num_spatial_dims == 2:
264			tensor = tensor[..., np.newaxis] # (C, W, H, 1)
265			elif num_spatial_dims == 3: # (W, H, D)
266			tensor = tensor[np.newaxis] # (1, W, H, D)
267			else: # try to guess
268			shape = tensor.shape
269			maybe_rgb = 3 in (shape[0], shape[-1])
270			if maybe_rgb:
271			if shape[-1] == 3: # (W, H, 3)
272			tensor = tensor.permute(2, 0, 1) # (3, W, H)
273			tensor = tensor[..., np.newaxis] # (3, W, H, 1)
274			else: # (W, H, D)
275			tensor = tensor[np.newaxis] # (1, W, H, D)
276			else:
277			message = (
278			f'{num_dimensions}D images not supported yet. Please create an'
279			f' issue in {REPO_URL} if you would like support for them'
280			)
281			raise ValueError(message)
282			assert tensor.ndim == 4
283			return tensor
284
285
286			def get_torchio_cache_dir():
287			return Path('~/.cache/torchio').expanduser()
288
289
290			def round_up(value: float) -> int:
291			"""Round half towards infinity.
292
293			Args:
294			value: The value to round.
295
296			Example:
297
298			>>> round(2.5)
299			2
300			>>> round(3.5)
301			4
302			>>> round_up(2.5)
303			3
304			>>> round_up(3.5)
305			4
306
307			"""
308			return int(np.floor(value + 0.5))
309
310
311			def compress(input_path, output_path):
312			with open(input_path, 'rb') as f_in:
313			with gzip.open(output_path, 'wb') as f_out:
314			shutil.copyfileobj(f_in, f_out)
315
316
317			def check_sequence(sequence: Sequence, name: str):
318			try:
319			iter(sequence)
320			except TypeError:
321			message = f'"{name}" must be a sequence, not {type(name)}'
322			raise TypeError(message)
323
324
325			def get_major_sitk_version() -> int:
326			# This attribute was added in version 2
327			# https://github.com/SimpleITK/SimpleITK/pull/1171
328			version = getattr(sitk, '__version__', None)
329			major_version = 1 if version is None else 2
330			return major_version
331
332
333			def history_collate(batch: Sequence, collate_transforms=True):
334			attr = 'history' if collate_transforms else 'applied_transforms'
335			# Adapted from
336			# https://github.com/romainVala/torchQC/blob/master/segmentation/collate_functions.py
337			from .data import Subject
338			first_element = batch[0]
339			if isinstance(first_element, Subject):
340			dictionary = {
341			key: default_collate([d[key] for d in batch])
342			for key in first_element
343			}
344			if hasattr(first_element, attr):
345			dictionary.update({attr: [getattr(d, attr) for d in batch]})
346			return dictionary
347
348
349			# Adapted from torchvision, removing print statements
350			def download_and_extract_archive(
351			url: str,
352			download_root: TypePath,
353			extract_root: Optional[TypePath] = None,
354			filename: Optional[TypePath] = None,
355			md5: str = None,
356			remove_finished: bool = False,
357			) -> None:
358			download_root = os.path.expanduser(download_root)
359			if extract_root is None:
360			extract_root = download_root
361			if not filename:
362			filename = os.path.basename(url)
363			download_url(url, download_root, filename, md5)
364			archive = os.path.join(download_root, filename)
365			from torchvision.datasets.utils import extract_archive
366			extract_archive(archive, extract_root, remove_finished)
367
368
369			# Adapted from torchvision, removing print statements
370			def download_url(
371			url: str,
372			root: TypePath,
373			filename: Optional[TypePath] = None,
374			md5: str = None,
375			) -> None:
376			"""Download a file from a url and place it in root.
377
378			Args:
379			url: URL to download file from
380			root: Directory to place downloaded file in
381			filename: Name to save the file under.
382			If ``None``, use the basename of the URL
383			md5: MD5 checksum of the download. If None, do not check
384			"""
385			import urllib
386			from torchvision.datasets.utils import check_integrity, gen_bar_updater
387
388			root = os.path.expanduser(root)
389			if not filename:
390			filename = os.path.basename(url)
391			fpath = os.path.join(root, filename)
392			os.makedirs(root, exist_ok=True)
393			# check if file is already present locally
394			if not check_integrity(fpath, md5):
395			try:
396			print('Downloading ' + url + ' to ' + fpath) # noqa: T001
397			urllib.request.urlretrieve(
398			url, fpath,
399			reporthook=gen_bar_updater()
400			)
401			except (urllib.error.URLError, OSError) as e:
402			if url[:5] == 'https':
403			url = url.replace('https:', 'http:')
404			message = (
405			'Failed download. Trying https -> http instead.'
406			' Downloading ' + url + ' to ' + fpath
407			)
408			print(message) # noqa: T001
409			urllib.request.urlretrieve(
410			url, fpath,
411			reporthook=gen_bar_updater()
412			)
413			else:
414			raise e
415			# check integrity of downloaded file
416			if not check_integrity(fpath, md5):
417			raise RuntimeError('File not found or corrupted.')
418
419
420			def check_uint_to_int(array):
421			# This is because PyTorch won't take uint16 nor uint32
422			if array.dtype == np.uint16:
423			return array.astype(np.int32)
424			if array.dtype == np.uint32:
425			return array.astype(np.int64)
426			return array
427

fepegar / torchio

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torchio.utils.check_uint_to_int() A

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