Arm backend: Preserve output order

[wwwind]

This change allows us to preserve output order after export.

Change-Id: I7ee55c2877ca1b247f10d2e90da3ba38dc727b6f
Signed-off-by: Elena Zhelezina elena.zhelezina@arm.com

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13997

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❌ 1 New Failure, 1 Unrelated Failure

As of commit c53ab9f with merge base 6c12956 ():

NEW FAILURE - The following job has failed:

• trunk / test-qnn-model (fp32, conv_former) / linux-job (gh)
  RuntimeError: Command docker exec -t 95fc2a6ca4a9f777728ecc7d50623726743239c691a47b61578fbb14365a8e9f /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[wwwind]

replacement for #13454 which is too old to update

[zingo]

Got the error below on [pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (pull_request)]
Retriggering to see if it's random.

FAILED backends/arm/test/misc/test_debug_feats.py::test_dump_tosa_debug_json[randn] - assert []
ERROR backends/arm/test/misc/test_outputs_order.py
= 1 failed, 2877 passed, 2404 skipped, 1827 xfailed, 133 xpassed, 4476 warnings, 1 error in 2480.77s (0:41:20) =

[zingo]

Got the same error in
trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (push)

@wwwind fails might unfortunately be related to the change. :(

[wwwind]

@zingo Thank you! I will take a look. I run this CR yesterday through all our tests in CI and it was green

[wwwind]

@zingo found the issue - should be fixed now 🤞

[digantdesai]

Déjà vu? :)