Fix failing tests: partitioner Python 3.12 compat + Vulkan hardshrink skip

[psiddh]

Summary:
Fix two test failures for the ai_infra_mobile_platform oncall:

1. test_partitioner_with_spec: Python 3.12 changed the AttributeError message for property setters from "can't set attribute 'spec'" to "property 'spec' of '...' object has no setter". Updated the assertRaisesRegex pattern to match both versions.

2. test_vulkan_backend_hardshrink (and 7 other swiftshader-incompatible tests): Replaced unconditional unittest.skip with a conditional skip_if_swiftshader decorator that detects swiftshader via env var (ETVK_USING_SWIFTSHADER), VK_ICD_FILENAMES, or loaded library check. Tests will now run on real Vulkan drivers (non-swiftshader environments) while still skipping in CI where swiftshader is used.

Differential Revision: D103628836

[pytorch-bot]

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❌ 2 New Failures, 5 Unrelated Failures

As of commit 35d3bcf with merge base 54b8176 ():

NEW FAILURES - The following jobs have failed:

• pull / test-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t f09f1632076c52c85996d666fe3d9e67313cb33b74ca08a47741adafc1c31265 /exec failed with exit code 1
• pull / test-lora-multimethod-linux / linux-job (gh)
  RuntimeError: Command docker exec -t da3f38b2889957cf675634dcfee1d8295bdcb75eb143e16b3a0f7b90c970a8d8 /exec failed with exit code 1

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

• pull / test-moshi-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/universe/p/pocketsphinx/pocketsphinx-en-us_0.8.0%2breal5prealpha%2b1-14ubuntu1_all.deb Unable to connect to archive.ubuntu.com:80: [IP: 185.125.190.81 80]

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_static_attention.py::StaticAttentionTest::test_within_transformer
• pull / unittest / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_static_attention.py::StaticAttentionTest::test_within_transformer
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[meta-codesync]

@psiddh has exported this pull request. If you are a Meta employee, you can view the originating Diff in D103628836.

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[Copilot]

Pull request overview

This PR updates two test-only changes to keep ExecuTorch CI green: one loosens a partitioner exception assertion for Python 3.12, and the other skips a Vulkan Hardshrink test because swiftshader crashes on unsupported SPIR-V features.

Changes:

• Broaden the assertRaisesRegex in the partitioner test to accept both pre-3.12 and 3.12+ property-setter AttributeError text.
• Mark the Vulkan Hardshrink delegate test as skipped due to swiftshader incompatibility.

Findings

• backends/vulkan/test/test_vulkan_delegate.py:593 — The new @unittest.skip(...) disables test_vulkan_backend_hardshrink on all Vulkan environments, not just swiftshader. Since Vulkan CI already sets ETVK_USING_SWIFTSHADER=1, this should be a conditional skip; otherwise we lose Hardshrink coverage on real Vulkan drivers and can miss backend regressions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
exir/backend/test/test_partitioner.py	Updates a regex in the partitioner immutability test for Python-version-dependent AttributeError wording.
backends/vulkan/test/test_vulkan_delegate.py	Adds a skip decorator to the Vulkan Hardshrink delegate test for swiftshader-related crashes.

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