def test_scalar():
"""
Test the introspection and creation of CIFTI-2 ScalarAxis axes
"""
sc = get_scalar()
assert len(sc) == 3
assert isinstance(sc, axes.ScalarAxis)
assert (sc.name == ['one', 'two', 'three']).all()
assert (sc.meta == [{}] * 3).all()
assert sc[1] == ('two', {})
sc2 = sc + sc
assert len(sc2) == 6
assert (sc2.name == ['one', 'two', 'three', 'one', 'two', 'three']).all()
assert (sc2.meta == [{}] * 6).all()
assert sc2[:3] == sc
assert sc2[3:] == sc
sc.meta[1]['a'] = 3
assert 'a' not in sc.meta
# test equalities
assert sc != get_label()
with assert_raises(Exception):
sc + get_label()
sc_other = deepcopy(sc)
assert sc == sc_other
assert sc != sc_other[:2]
assert sc == sc_other[:]
sc_other.name[0] = 'new_name'
assert sc != sc_other
sc_other = deepcopy(sc)
sc_other.meta[0]['new_key'] = 'new_entry'
assert sc != sc_other
sc.meta[0]['new_key'] = 'new_entry'
assert sc == sc_other
# test constructor
assert axes.ScalarAxis(['scalar_name'], [{}]) == axes.ScalarAxis(['scalar_name'])
with assert_raises(ValueError):
axes.ScalarAxis([['scalar_name']]) # wrong shape
with assert_raises(ValueError):
axes.ScalarAxis(['scalar_name'], [{}, {}]) # wrong size
def get_scalar():
"""
Generates a practice ScalarAxis axis with names ('one', 'two', 'three')
Returns
-------
ScalarAxis axis
"""
return axes.ScalarAxis(['one', 'two', 'three'])
def bad_cifti():
import nibabel.cifti2.cifti2 as ncif
import nibabel.cifti2.cifti2_axes as ncax
np.random.seed(seed=1)
data = np.random.uniform(size=(1, 50))
ser_ax = ncax.ScalarAxis(name=["Data"])
h = ncif.Cifti2Header.from_axes((ser_ax, ser_ax))
c = ncif.Cifti2Image(data, h)
return c
def cifti():
import nibabel.cifti2.cifti2 as ncif
import nibabel.cifti2.cifti2_axes as ncax
np.random.seed(seed=1)
verts = np.arange(0, 100, 2)
data = np.random.uniform(size=(1, 50))
ser_ax = ncax.ScalarAxis(name=["Data"])
bm_ax = ncax.BrainModelAxis(name="CORTEX_LEFT",
vertex=verts,
affine=np.eye(4),
nvertices={"CORTEX_LEFT": verts.shape[0]})
h = ncif.Cifti2Header.from_axes((ser_ax, bm_ax))
c = ncif.Cifti2Image(data, h)
return c
def test_extract_dense():
vol_bm = volumetric_brain_model()
surf_bm = surface_brain_model()
for bm in (vol_bm + surf_bm, surf_bm + vol_bm):
for ndim, no_other_axis in ((1, True), (2, False), (2, True)):
if ndim == 1:
data = cifti.DenseCifti(gen_data([bm]), [bm])
else:
scl = cifti2_axes.ScalarAxis(['A', 'B', 'C'])
data = cifti.DenseCifti(gen_data([scl, bm]),
[None if no_other_axis else scl, bm])
# extract volume
ref_arr = data.arr[..., data.brain_model_axis.volume_mask]
vol_image = data.to_image(fill=np.nan)
if ndim == 1:
assert vol_image.shape == data.brain_model_axis.volume_shape
else:
assert vol_image.shape == data.brain_model_axis.volume_shape + (
3, )
assert np.isfinite(
vol_image.data).sum() == len(vol_bm) * (3 if ndim == 2 else 1)
testing.assert_equal(vol_image.data[tuple(vol_bm.voxel.T)],
ref_arr.T)
from_image = cifti.DenseCifti.from_image(vol_image)
assert from_image.brain_model_axis == vol_bm
testing.assert_equal(from_image.arr, ref_arr)
# extract surface
ref_arr = data.arr[..., data.brain_model_axis.surface_mask]
mask, surf_data = data.surface('cortex', partial=True)
assert surf_data.shape[-1] < 100
testing.assert_equal(ref_arr, surf_data)
testing.assert_equal(surf_bm.vertex, mask)
surf_data_full = data.surface('cortex', fill=np.nan)
assert surf_data_full.shape[-1] == 100
mask_full = np.isfinite(surf_data_full)
if ndim == 2:
assert (mask_full.any(0) == mask_full.all(0)).all()
mask_full = mask_full[0]
assert mask_full.sum() == len(surf_bm)
assert mask_full[..., mask].sum() == len(surf_bm)
testing.assert_equal(surf_data_full[..., mask_full], ref_arr)
def to_cifti(self, default_axis=None):
"""
Create a CIFTI image from the data
:param default_axis: What to use as an axis along any undefined dimensions
- By default an error is raised
- if set to "scalar" a ScalarAxis is used with names of "default {index}"
- if set to "series" a SeriesAxis is used
:return: nibabel CIFTI image
"""
if any(ax is None for ax in self.axes):
if default_axis is None:
raise ValueError(
"Can not store to CIFTI without defining what is stored along each dimension"
)
elif default_axis == 'scalar':
def get_axis(n: int):
return cifti2_axes.ScalarAxis(
[f'default {idx + 1}' for idx in range(n)])
elif default_axis == 'series':
def get_axis(n: int):
return cifti2_axes.SeriesAxis(0, 1, n)
else:
raise ValueError(
f"default_axis should be set to None, 'scalar', or 'series', not {default_axis}"
)
new_axes = [
get_axis(sz) if ax is None else ax
for ax, sz in zip(self.axes, self.arr.shape)
]
else:
new_axes = list(self.axes)
data = self.arr
if data.ndim == 1:
# CIFTI axes are always at least 2D
data = data[None, :]
new_axes.insert(0, cifti2_axes.ScalarAxis(['default']))
return nib.Cifti2Image(data, header=new_axes)
def test_io_cifti():
for cifti_class, cifti_type, main_axis_options in (
(cifti.DenseCifti, 'd',
(volumetric_brain_model(), surface_brain_model(),
volumetric_brain_model() + surface_brain_model())),
(cifti.ParcelCifti, 'p', (volumetric_parcels(), surface_parcels(),
volumetric_parcels() + surface_parcels())),
):
for main_axis in main_axis_options:
with tests.testdir():
data_1d = cifti_class(gen_data([main_axis]), [main_axis])
check_io(data_1d, f'{cifti_type}scalar')
connectome = cifti_class(gen_data([main_axis, main_axis]),
(main_axis, main_axis))
check_io(connectome, f'{cifti_type}conn')
scalar_axis = cifti2_axes.ScalarAxis(['A', 'B', 'C'])
scalar = cifti_class(gen_data([scalar_axis, main_axis]),
(scalar_axis, main_axis))
check_io(scalar, f'{cifti_type}scalar')
label_axis = cifti2_axes.LabelAxis(
['A', 'B', 'C'], {1: ('some parcel', (1, 0, 0, 1))})
label = cifti_class(gen_data([label_axis, main_axis]),
(label_axis, main_axis))
check_io(label, f'{cifti_type}label')
series_axis = cifti2_axes.SeriesAxis(10, 3, 50, unit='HERTZ')
series = cifti_class(gen_data([series_axis, main_axis]),
(series_axis, main_axis))
check_io(series, f'{cifti_type}tseries')
if cifti_type == 'd':
parcel_axis = surface_parcels()
dpconn = cifti_class(gen_data([parcel_axis, main_axis]),
(parcel_axis, main_axis))
check_io(dpconn, 'dpconn')
else:
dense_axis = surface_brain_model()
pdconn = cifti_class(gen_data([dense_axis, main_axis]),
(dense_axis, main_axis))
check_io(pdconn, 'pdconn')
def test_extract_parcel():
vol_parcel, vol_mask = volumetric_parcels(return_mask=True)
surf_parcel, surf_mask = surface_parcels(return_mask=True)
parcel = vol_parcel + surf_parcel
for ndim, no_other_axis in ((1, True), (2, False), (2, True)):
if ndim == 1:
data = cifti.ParcelCifti(gen_data([parcel]), [parcel])
else:
scl = cifti2_axes.ScalarAxis(['A', 'B', 'C'])
data = cifti.ParcelCifti(gen_data([scl, parcel]),
[None if no_other_axis else scl, parcel])
# extract volume
vol_image = data.to_image(fill=np.nan)
if ndim == 1:
assert vol_image.shape == data.parcel_axis.volume_shape
else:
assert vol_image.shape == data.parcel_axis.volume_shape + (3, )
assert np.isfinite(vol_image.data).sum() == np.sum(
vol_mask != 0) * (3 if ndim == 2 else 1)
if ndim == 1:
testing.assert_equal(vol_mask != 0, np.isfinite(vol_image.data))
for idx in range(1, 5):
testing.assert_allclose(vol_image.data[vol_mask == idx],
data.arr[..., idx - 1])
else:
for idx in range(3):
testing.assert_equal(vol_mask != 0,
np.isfinite(vol_image.data[..., idx]))
for idx2 in range(1, 5):
testing.assert_allclose(
vol_image.data[vol_mask == idx2, idx],
data.arr[idx, idx2 - 1])
# extract surface
mask, surf_data = data.surface('cortex', partial=True)
assert surf_data.shape[-1] == (surf_mask != 0).sum()
assert (surf_mask[mask] != 0).all()
print(data.arr)
for idx in range(1, 5):
if ndim == 1:
testing.assert_equal(surf_data.T[surf_mask[mask] == idx],
data.arr[idx + 3])
else:
for idx2 in range(3):
testing.assert_equal(
surf_data.T[surf_mask[mask] == idx, idx2],
data.arr[idx2, idx + 3])
surf_data_full = data.surface('cortex', partial=False)
assert surf_data_full.shape[-1] == 100
if ndim == 1:
testing.assert_equal(np.isfinite(surf_data_full), surf_mask != 0)
for idx in range(1, 5):
testing.assert_equal(surf_data_full.T[surf_mask == idx],
data.arr[idx + 3])
else:
for idx2 in range(3):
testing.assert_equal(
np.isfinite(surf_data_full)[idx2], (surf_mask != 0))
for idx in range(1, 5):
testing.assert_equal(
surf_data_full.T[surf_mask == idx, idx2],
data.arr[idx2, idx + 3])
def get_axis(n: int):
return cifti2_axes.ScalarAxis(
[f'default {idx + 1}' for idx in range(n)])
