enable gpu load nifti

[yiheng-wang-nv]

Related to #8241 .

Description

A few sentences describing the changes proposed in this pull request.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

[yiheng-wang-nv]

related topic in: nipy/nibabel#1385

Will modify my draft PR accordingly.

[KumoLiu]

Thank you for your contribution!

I have a question about this enhancement: Will it load NIfTI/DICOM files to the GPU faster compared to caching all the data on the GPU? If not, does this option use less GPU memory since the metadata is stored on the CPU? Thanks.

[yiheng-wang-nv]

Thank you for your contribution!

I have a question about this enhancement: Will it load NIfTI/DICOM files to the GPU faster compared to caching all the data on the GPU? If not, does this option use less GPU memory since the metadata is stored on the CPU? Thanks.

Hi @KumoLiu , these are two different things. The enhanced reader can load nii images from disk to GPU directly (the old way is to load from disk to cpu, and then convert from cpu to gpu), and the loaded data can do other things, like cache as you mentioned.

[yiheng-wang-nv]

Hi @KumoLiu , do you know what is the root cause of the doc error: https://github.com/Project-MONAI/MONAI/actions/runs/12311294929/job/34361260922?pr=8188#step:7:247
cupy and kvikio are only imported optionally, I'm not sure why we have the error. Do I need to modify some other places?

[KumoLiu]

Hi @KumoLiu , do you know what is the root cause of the doc error: https://github.com/Project-MONAI/MONAI/actions/runs/12311294929/job/34361260922?pr=8188#step:7:247 cupy and kvikio are only imported optionally, I'm not sure why we have the error. Do I need to modify some other places?

Yes, you may need include cupy here: https://github.com/Project-MONAI/MONAI/blob/dev/docs/requirements.txt

[KumoLiu]

/build

[KumoLiu]

/build