Qualcomm AI Engine Direct - Adding QNN backend support for scatter.value core ATen op

[qti-horodnic]

Summary

Adds support for aten.scatter.value on the QNN backend by extending the existing ScatterElements builder.

torch.scatter(data, dim, index, value) scatters a scalar value into data at positions specified by index. Unlike scatter.src (which takes a tensor), scatter.value takes a scalar which requires special handling in the builder to convert the scalar to a static tensor compatible with QNN's ScatterElements op.

Test plan

pytest backends/qualcomm/tests/rework/htp/op/v68/test.py -k "test_scatter_value" -v


python backends/qualcomm/tests/test_qnn_delegate.py TestQNNQuantizedOperator.test_qnn_backend_scatter_value --soc_model SM8750 --host aisw-vm15-labsd --device 545ee4aa --build_folder build-android

python backends/qualcomm/tests/test_qnn_delegate.py TestQNNFloatingPointOperator.test_qnn_backend_scatter_value --soc_model SM8750 --host aisw-vm15-labsd --device 545ee4aa --build_folder build-android

[qti-horodnic]

@pytorchbot label "release notes: qualcomm"

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⚠️ 12 Awaiting Approval, 2 Unrelated Failures

As of commit da92cc5 with merge base 96c83ed ():

AWAITING APPROVAL - The following workflows need approval before CI can run:

• Build documentation (gh)
• Build Presets (gh)
• Lint (gh)
• periodic (gh)
• pull (gh)
• Test ARM Backend (gh)
• Test CoreML Backend (gh)
• Test QNN Backend (gh)
• Test QNN Windows MSVC build (gh)
• Test Vulkan Backend (gh)
• Test WebGPU Backend (gh)
• Test XNNPACK Backend (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Docathon Labels Sync / check-labels (gh) (detected as infra flaky with no log or failing log classifier)
• Labeler / label (gh) (detected as infra flaky with no log or failing log classifier)

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