[Vulkan] Keep unrepresentable and symbolic scalars out of the delegate - #23208
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The binary-scalar and comparison kernels receive scalars as int32 or float, yet the partitioner accepted NaN, integers outside int32 and symbolic scalars, which lowered with wrong values or failed in the graph builder. is_scalar_value_supported rejects them for pow.Tensor_Scalar and the comparison scalar ops. The partitioner also rejects SymFloat and SymBool values and keeps SymInt producers on CPU when a consumer is unsupported; node support is memoized so that check stays linear. Authored with OpenAI Codex; split planned with Claude Code.
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/23208
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Superseded by #23247, part 8/15 of the ghstack replacement series. The current integration PR is #23254. This PR is closed in favor of the replacement; its previous description and review history are retained.
The binary-scalar and comparison kernels receive scalars as int32 or float, yet the partitioner accepted NaN, integers outside int32 and symbolic scalars, which lowered with wrong values or failed in the graph builder. is_scalar_value_supported rejects them for pow.Tensor_Scalar and the comparison scalar ops. The partitioner also rejects SymFloat and SymBool values and keeps SymInt producers on CPU when a consumer is unsupported; node support is memoized so that check stays linear.
Part 8/15 of the Vulkan transformer and operator-conformance stack. Depends on #23207; review against the selected base branch. Integration PR: #23162.
Validation: 5 passed, 2 warnings in 150.36s (0:02:30). Lintrunner and git diff --check pass. Native tests use MoltenVK with portable CPU kernels; hardware and SwiftShader CI are pending.
Authored with OpenAI Codex; split planned with Claude Code.
cc @SS-JIA @manuelcandales @digantdesai @cbilgin