Data utils

[teresamg]

No description provided.

[teresamg]

Hey @oesteban, do you know what this error is?

---

AttributeError Traceback (most recent call last)
Input In [44], in <cell line: 1>()
----> 1 transformed_nii = (~xfms).apply(nii)
File ~/miniconda3/envs/eddymotion/lib/python3.8/site-packages/nitransforms/linear.py:440, in LinearTransformsMapping.apply(self, spatialimage, reference, order, mode, cval, prefilter, output_dtype)
437 data = np.squeeze(np.asanyarray(spatialimage.dataobj))
438 output_dtype = output_dtype or data.dtype
--> 440 ycoords = self.map(_ref.ndcoords.T)
441 targets = ImageGrid(spatialimage).index( # data should be an image
442 _as_homogeneous(np.vstack(ycoords), dim=_ref.ndim)
443 )
445 if data.ndim == 4:
AttributeError: 'NoneType' object has no attribute 'ndcoords'

[oesteban]

Yup, you need to set a reference image for the transform

[teresamg]

@oesteban The tests seem to be passing now, any thoughts or is this ready to merge?

[arokem]

Looks like the test failure is unrelated to this PR. Just one of those intermittent/random failures of the registration.