[JacobSzwejbka]

Supersedes #24377 with a clean release pick from #24294.

Fixes scalar tensors, float32 CPU defaults, dynamic output buffers and integer reductions. Includes the related #24396 runtime, folded-cumsum, parameter-count and CI runner follow-ups previously spread across #24377 and #24446.

This pick contains the complete core OpenVINO fix and its required follow-ups. Bool-op handling and masked-read metadata are isolated in the next clean pick. The source float32 default can cost speed on CPUs with bfloat16 hardware; inference_precision=bf16 remains available.

Scope and landing order

Land after #24491 in the verified landing order. The OpenVINO pair follows the CUDA picks; these backend groups can otherwise be reviewed separately.

This branch starts directly at release/1.6 commit dfb78b9ecd933a5fee33ebc94f69ed4b71cbb1e7. Its GitHub diff contains 16 files for this pick; it does not carry duplicate #24298 history or the excluded unmerged QNN work. Dependencies are documented here rather than embedded as other cherry-pick commits.

Verification

All changed Python files compile and pass Ruff F821 checks. All seven replacements merge cleanly in the documented sequence, including simulated squash merges. No QNN files are changed. The combined OpenVINO production code matches the previously reviewed final #24446 code; the bool test class is preserved unchanged.

Native CUDA, OpenVINO and portable C++ suites were not run locally on this macOS host; PR CI remains required before landing.

Prepared with OpenAI Codex.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/24492

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures, 25 Pending

As of commit 3f1ba87 with merge base 4db778e ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  adb: device offline
• pull / nxp-mcuxpresso-test / linux-job (gh)
  undefined reference to SYS_INFO_PrintAll'`
• trunk / test-torchao-huggingface-checkpoints (lfm2_5_1_2b, mt-l-arm64g4-16-62, executorch-ubuntu-22.04-gc... / linux-job (gh)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1
• trunk / test-torchao-huggingface-checkpoints (lfm2_5_1_2b, mt-l-x86iavx512-8-64, executorch-ubuntu-22.04-... / linux-job (gh)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1

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