NXP backend: added aten.split support

[novak-vaclav]

Summary

adds support for aten.split operator

Test plan

tests can be manually run using pytest -c /dev/null backends/nxp/tests/

cc @robert-kalmar @JakeStevens @digantdesai @MartinPavella

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16490

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 5 New Failures, 1 Unrelated Failure

As of commit 3016a50 with merge base 0391fe7 ():

NEW FAILURES - The following jobs have failed:

• Copilot code review / Cleanup artifacts (gh)
  Process completed with exit code 1.
• pull / unittest-arm-backend-with-no-deps (test_pytest_models_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t fb19b14963f74a50db31ea4fcea3eeaeb6a4820a736f40bf76e32389199becc8 /exec failed with exit code 127
• pull / unittest-arm-backend-with-no-deps (test_pytest_ops_no_target) / linux-job (gh)
  RuntimeError: Command docker exec -t cef8ac86f7be27b9b3682ddb81beb6b45837deafb233815eaeacbce75caf5d3c /exec failed with exit code 127
• pull / unittest-arm-backend-with-no-deps (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 58b1167da03d6ec9b8227602b21644ffcb345297133cd5b7de69f782e74aedfc /exec failed with exit code 127
• pull / unittest-arm-backend-with-no-deps (test_run_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t a02c4a4de99aa35ef6557072f04401a3cf8b6a9e25412aa87222b2327a6a1d8c /exec failed with exit code 127

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[novak-vaclav]

@pytorchbot label "release notes: nxp"

[novak-vaclav]

@pytorchbot label "module: nxp"

[novak-vaclav]

Fixed all issues mentioned in this PR (#16276), including the comment of @roman-janik-nxp
But due to my error I had to create a new PR.

[Copilot]

Pull request overview

This PR adds support for the aten.split operator in the NXP backend by introducing a new pass that decomposes split operations into slice operations. The key addition is the DecomposeSplitToSlicesPass, which transforms aten.split.Tensor, aten.split.default, and aten.split_with_sizes.default operations into equivalent aten.slice.Tensor operations that the backend can handle.

Key changes:

• Added DecomposeSplitToSlicesPass to decompose split operations into slices
• Removed ConvertUnsqueezeToViewPass from the default pass manager
• Added test models (SplitWithSize, SplitWithSections, GRUModel) to support split testing
• Introduced comprehensive tests for the new decomposition pass

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
backends/nxp/aten_passes/decompose_split_to_slices_pass.py	New pass that decomposes split operations into multiple slice operations for backend compatibility
backends/nxp/aten_passes/neutron_aten_pass_manager.py	Added DecomposeSplitToSlicesPass to default passes and removed ConvertUnsqueezeToViewPass import
backends/nxp/tests/test_decompose_split_to_slices.py	Comprehensive test suite for the new split decomposition pass
backends/nxp/tests/models.py	Added test models (GRUModel, SplitWithSize, SplitWithSections) to support split operation testing
backends/nxp/tests/test_split_group_convolution.py	Added workaround to exclude DecomposeSplitToSlicesPass from affecting group convolution tests

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.