[ExecuTorch][WebGPU] Op-test for pow.Tensor_Scalar

[JCNTH]

Stack from ghstack (oldest at bottom):

• [ExecuTorch][WebGPU] Broadcast add.Tensor (mirror mul) + un-skip 6 models #21233
• [ExecuTorch][WebGPU] Add dynamic-shape resize hook to cat (output mismatch) #21232
• [ExecuTorch][WebGPU] Raise TensorMeta rank cap 4->8 to fix rank>4 ops (0x30) #21231
• [ExecuTorch][WebGPU] Add bitwise_or + logical_or ops (bool) #21230
• [ExecuTorch][WebGPU] Add linear_dq8ca_q4gsw + choose_qparams_affine (8da4w) #21229
• [ExecuTorch][WebGPU] Enable + golden int8 quantized ops (q8ta family + qcs4w/q8ta_q8csw linear) #21228
• [ExecuTorch][WebGPU] Enable + golden granular ops (elementwise/bool, shape/movement, pooling, conv/sampling) #21227
• [ExecuTorch][WebGPU] Add creation/cast ops (full family, scalar_tensor, _to_copy) + enable unary activation family #21226
• [ExecuTorch][WebGPU] Optimize reduction-family kernels to cooperative shared-memory #21225
• [ExecuTorch][WebGPU] Op-tests for bitwise_and + bitwise_not #21224
• [ExecuTorch][WebGPU] Add bitwise_and + bitwise_not ops (bool) #21223
• [ExecuTorch][WebGPU] Op-tests for logical_and #21222
• [ExecuTorch][WebGPU] Add logical_and op (aten.logical_and.default) #21221
• [ExecuTorch][WebGPU] Op-tests for comparisons + bool-output golden harness #21220
• [ExecuTorch][WebGPU] Add comparison ops (aten.eq/lt/le/gt/ge.Tensor -> bool) #21219
• [ExecuTorch][WebGPU] Op-tests for conv_with_clamp #21218
• [ExecuTorch][WebGPU] Add conv_with_clamp op (et_vk.conv_with_clamp) #21217
• [ExecuTorch][WebGPU] Op-tests for grid_priors #21216
• [ExecuTorch][WebGPU] Add grid_priors op (et_vk.grid_priors) #21215
• [ExecuTorch][WebGPU] Op-tests for linear_q8ta_q8csw #21214
• [ExecuTorch][WebGPU] Add linear_q8ta_q8csw op (et_vk.linear_q8ta_q8csw) #21213
• [ExecuTorch][WebGPU] Op-tests for linear_qcs4w #21212
• [ExecuTorch][WebGPU] Add linear_qcs4w op (et_vk.linear_qcs4w) #21211
• [ExecuTorch][WebGPU] Op-tests for argmax/argmin + int64-golden harness #21210
• [ExecuTorch][WebGPU] Add argmax/argmin ops + int64-output path #21209
• [ExecuTorch][WebGPU] Op-tests for floor_divide #21208
• [ExecuTorch][WebGPU] Add floor_divide op (aten.div.Tensor_mode) #21207
• [ExecuTorch][WebGPU] Op-tests for q8ta_conv2d_transposed #21206
• [ExecuTorch][WebGPU] Add q8ta_conv2d_transposed op (int8 transposed conv) #21205
• [ExecuTorch][WebGPU] Op-tests for q8ta_conv2d #21204
• [ExecuTorch][WebGPU] Add q8ta_conv2d op (int8 general conv) #21203
• [ExecuTorch][WebGPU] Op-tests for q8ta_conv2d_dw #21202
• [ExecuTorch][WebGPU] Add q8ta_conv2d_dw op (int8 depthwise conv) #21201
• [ExecuTorch][WebGPU] Op-tests for q8ta_conv2d_pw #21200
• [ExecuTorch][WebGPU] Add q8ta_conv2d_pw op (int8 pointwise conv) #21199
• [ExecuTorch][WebGPU] Op-tests for q8ta_linear #21198
• [ExecuTorch][WebGPU] Add q8ta_linear op (int8 quantized linear) #21197
• [ExecuTorch][WebGPU] Op-tests for q8ta_pixel_shuffle #21196
• [ExecuTorch][WebGPU] Add q8ta_pixel_shuffle op (int8 pixel_shuffle) #21195
• [ExecuTorch][WebGPU] Op-tests for q8ta_relu #21194
• [ExecuTorch][WebGPU] Add q8ta_relu op (int8 relu) #21193
• [ExecuTorch][WebGPU] Op-tests for q8ta_add #21192
• [ExecuTorch][WebGPU] Add q8ta_add op (int8 elementwise add) #21191
• [ExecuTorch][WebGPU] Op-tests for quantize/dequantize_per_tensor #21190
• [ExecuTorch][WebGPU] Op-test harness: int8-output golden support #21189
• [ExecuTorch][WebGPU] Add dequantize_per_tensor op (int8 buffer path) #21188
• [ExecuTorch][WebGPU] Add quantize_per_tensor op (int8 buffer path) #21187
• [ExecuTorch][WebGPU] Test apply_rotary_emb_interleaved #21186
• [ExecuTorch][WebGPU] Add apply_rotary_emb_interleaved op #21185
• [ExecuTorch][WebGPU] Op-tests for conv1d pointwise #21184
• [ExecuTorch][WebGPU] Port conv1d pointwise (aten.convolution) #21183
• [ExecuTorch][WebGPU] Op-tests for conv1d_dw (depthwise conv1d) #21182
• [ExecuTorch][WebGPU] Port aten.convolution (depthwise conv1d) #21181
• [ExecuTorch][WebGPU] Op-tests for grid_sampler_2d #21180
• [ExecuTorch][WebGPU] Port grid_sampler_2d #21179
• [ExecuTorch][WebGPU] Op-tests for pixel_shuffle #21178
• [ExecuTorch][WebGPU] Port pixel_shuffle #21177
• [ExecuTorch][WebGPU] Op-tests for avg_pool2d #21176
• [ExecuTorch][WebGPU] Port avg_pool2d #21175
• [ExecuTorch][WebGPU] Op-tests for native_group_norm #21174
• [ExecuTorch][WebGPU] Port native_group_norm #21173
• [ExecuTorch][WebGPU] Op-tests for index_select #21172
• [ExecuTorch][WebGPU] Port index_select #21171
• [ExecuTorch][WebGPU] Op-test framework: multi-output goldens #21170
• [ExecuTorch][WebGPU] Op-tests for repeat #21169
• [ExecuTorch][WebGPU] Port repeat #21168
• [ExecuTorch][WebGPU] Op-tests for flip #21167
• [ExecuTorch][WebGPU] Port flip #21166
• [ExecuTorch][WebGPU] Op-tests for amax + amin #21165
• [ExecuTorch][WebGPU] Port amax + amin (last-dim reductions) #21164
• -> [ExecuTorch][WebGPU] Op-test for pow.Tensor_Scalar #21163
• [ExecuTorch][WebGPU] Port pow.Tensor_Scalar #21162
• [ExecuTorch][WebGPU] Op-tests for pow #21161
• [ExecuTorch][WebGPU] Port pow (aten.pow.Tensor_Tensor) #21160
• [ExecuTorch][WebGPU] Op-test for minimum #21159
• [ExecuTorch][WebGPU] Port minimum (first A2 binary op) #21158
• [ExecuTorch][WebGPU] Op-tests for clamp + hardtanh #21157
• [ExecuTorch][WebGPU] Port clamp + hardtanh (clamp-family unary ops) #21156
• [ExecuTorch][WebGPU] Op-tests for the 10 unary activations #21155
• [ExecuTorch][WebGPU] Port 10 unary activations to the WebGPU backend #21154
• [ExecuTorch][WebGPU] Promote unary op plumbing to a shared 2D-dispatch helper #21153

Adds the pow_scalar op-test suite (square + sqrt exponents, positive base) for the op ported in the diff below.

Key changes:

• test/ops/test_unary_activations.py — PowScalarModule + POW_SCALAR_CONFIGS.
• test/op_tests/cases.py — _pow_scalar_suite.
  @exported-using-ghexport

Differential Revision: D112257612

Differential Revision: D112257612

[pytorch-bot]

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❌ 6 New Failures, 86 Pending, 42 Unrelated Failures

As of commit b8f27ad with merge base 4a26c64 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / linux (linux, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
• Build Presets / linux (llm, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
• Build Presets / linux (pybind, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
• Build Presets / windows (pybind) / build (gh)
• Build Presets / windows (windows) / build (gh)
• Test QNN Windows MSVC build / build-qnn-windows-msvc / windows-job (gh)

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

• pull / test-arm-backend-public-api-backward-compatibility / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-eval_llama-wikitext-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-llama_runner_eager-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-llama-runner-linux (fp32, xnnpack+custom+qe, linux.arm64.2xlarge, executorch-ubuntu-22.04-gc... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu-22.04-... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-lora-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
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• pull / test-mediatek-models-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (emformer_join, portable, linux.4xlarge.memory) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (emformer_join, xnnpack-quantization-delegation, linux.4xlarge.memory) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (ic4, portable, linux.4xlarge.memory) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (ic4, xnnpack-quantization-delegation, linux.4xlarge.memory) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (llama3_2_vision_encoder, portable, linux.4xlarge.memory) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (w2l, portable, linux.4xlarge.memory) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux-basic (mv3, portable, cmake, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux-basic (mv3, xnnpack-quantization-delegation, cmake, linux.arm64.2xlarge, execut... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux-basic (vit, portable, cmake, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux-basic (vit, xnnpack-quantization-delegation, cmake, linux.arm64.2xlarge, execut... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-parakeet-xnnpack-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-phi-3-mini-runner-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-voxtral-realtime-xnnpack-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
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• pull / unittest-editable / windows / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test ARM Backend / test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test ARM Backend / test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test ARM Backend / test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test ARM Backend / test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test QNN Backend / test-qnn / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test QNN Backend / test-qnn / test-backend-linux (qnn, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test Vulkan Backend / test-vulkan / test-backend-linux (vulkan, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test Vulkan Backend / test-vulkan / test-backend-linux (vulkan, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test WebGPU Backend / test-webgpu / test-backend-linux (webgpu, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test WebGPU Backend / test-webgpu / test-backend-linux (webgpu, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test XNNPACK Backend / test-xnnpack / test-backend-linux (xnnpack, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Test XNNPACK Backend / test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[Copilot]

Pull request overview

Adds WebGPU op-test coverage for aten.pow.Tensor_Scalar by introducing a small module wrapper with a baked scalar exponent and registering a corresponding declarative test suite in the WebGPU op-test registry.

Changes:

• Added PowScalarModule and POW_SCALAR_CONFIGS (square and sqrt exponents) to the unary activations test helpers.
• Registered a new pow_scalar op-test suite in cases.py that generates deterministic positive-base inputs to avoid pow(neg, frac) -> NaN behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
backends/webgpu/test/ops/test_unary_activations.py	Adds PowScalarModule plus config constants used by the declarative op-test suites.
backends/webgpu/test/op_tests/cases.py	Registers the pow_scalar suite and wires it into the op-test case generation.

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[psiddh]

Approving full WebGPU stack