[ExecuTorch][WebGPU] Add upsample_bilinear2d op#20991
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[ExecuTorch][WebGPU] Add relu op (shared unary handler; sigmoid adopts make_compute_pipeline)
#20863
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Stack from ghstack (oldest at bottom):
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aten.upsample_bilinear2d.vecto the WebGPU backend — the bilinear resize on the Depth-Anything / DPT reassemble+fusion head, which upsamples the ViT patch grid back to image resolution.Problem: The WebGPU delegate had only nearest-neighbor upsample, so depth-estimation models using bilinear resize could not fully delegate to the GPU.
Solution: A 4D NCHW fp32 kernel where each output pixel bilinearly interpolates its four source neighbors.
align_cornersselects the source-index formula (matching ATenarea_pixel_compute_source_index); output H/W come from the output tensor's own dims.Implementation:
runtime/ops/upsample_bilinear2d/{UpsampleBilinear2d.cpp,upsample_bilinear2d.wgsl,upsample_bilinear2d_wgsl.h}registeringaten.upsample_bilinear2d.vec; usesutils::make_compute_pipeline+utils::compute_dispatch_grid+utils::make_grid_constants.upsample_bilinear2d.vecdelegate.WEBGPU_SRCSentry.Constraints: fp32-only, 4D in/out with N/C preserved — throws on rank/shape/dtype mismatch (fail-loud, never a silent zero output); no change to existing ops.
Differential Revision: D112417281