[slimtensor] Enable CUDA tensor copy #16771
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This diff enables CUDA tensor copy operations in SlimTensor.
**Key changes:**
**`core/SlimTensor.h`** - Extended for CUDA support:
- Updated `copy_()` to handle cross-device copies:
- CPU→CUDA (cudaMemcpyHostToDevice)
- CUDA→CPU (cudaMemcpyDeviceToHost)
- CUDA→CUDA (cudaMemcpyDeviceToDevice, same device)
- Cross-device copies require contiguous tensors
- CPU-to-CPU copies continue to support non-contiguous (strided) tensors
Differential Revision: [D91202900](https://our.internmc.facebook.com/intern/diff/D91202900/)
[ghstack-poisoned]
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16771
Note: Links to docs will display an error until the docs builds have been completed. ❌ 2 New FailuresAs of commit 93535cc with merge base 3cd3b92 ( NEW FAILURES - The following jobs have failed:
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This diff enables CUDA tensor copy operations in SlimTensor.
**Key changes:**
**`core/SlimTensor.h`** - Extended for CUDA support:
- Updated `copy_()` to handle cross-device copies:
- CPU→CUDA (cudaMemcpyHostToDevice)
- CUDA→CPU (cudaMemcpyDeviceToHost)
- CUDA→CUDA (cudaMemcpyDeviceToDevice, same device)
- Cross-device copies require contiguous tensors
- CPU-to-CPU copies continue to support non-contiguous (strided) tensors
Differential Revision: [D91202900](https://our.internmc.facebook.com/intern/diff/D91202900/)
[ghstack-poisoned]
meta-codesync
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merged commit 21b5076
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Jan 22, 2026
This PR was created by the merge bot to help merge the original PR into the main branch. ghstack PR number: #16771 by @Gasoonjia ^ Please use this as the source of truth for the PR details, comments, and reviews ghstack PR base: https://github.com/pytorch/executorch/tree/gh/gasoonjia/111/base ghstack PR head: https://github.com/pytorch/executorch/tree/gh/gasoonjia/111/head Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/gasoonjia/110/orig Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/gasoonjia/111/orig Differential Revision: [D91202900](https://our.internmc.facebook.com/intern/diff/D91202900/) @diff-train-skip-merge --------- Co-authored-by: gasoonjia <gasoonjia@icloud.com> Co-authored-by: Gasoonjia <gasoonjia@meta.com>
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Stack from ghstack (oldest at bottom):
This diff enables CUDA tensor copy operations in SlimTensor.
Key changes:
core/SlimTensor.h- Extended for CUDA support:copy_()to handle cross-device copies:Differential Revision: D91202900