[ExecuTorch][WebGPU] SDPA test suite: replay + dynamic input_pos + in-graph KV cache#20260
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JulianCloudNTH merged 4 commits intoJun 13, 2026
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…-graph KV cache Pull Request resolved: #20087 Adds the WebGPU SDPA test coverage as its own diff, stacked on the SDPA op (which already carries the dynamic-`input_pos` consumption) and the SymInt mechanism below it: multi-step prefill->mt->decode replay, runtime-dynamic `input_pos` (autoregressive decode), and an in-graph mutable KV cache, each compared against a torch `F.scaled_dot_product_attention` golden. - `test/ops/sdpa/test_sdpa.py`: `ReplaySeq`/`REPLAY_SEQS` + per-step replay export/golden; `DynamicSdpaModule` + `export_dynamic_decode` (one `.pte`, `input_pos` supplied at runtime as a SymInt); `DecodeCacheModule` + `export_incache_decode` (KV cache as `register_buffer` mutable buffers, so the cache persists in-graph and forward() feeds only the new token + `input_pos`). - `test/test_webgpu_native.cpp`: `test_sdpa_replay`, `test_sdpa_dynamic_decode` (+ negative control: a pinned `input_pos` diverges), `test_sdpa_incache_decode` (+ static control: a fresh Module per step diverges, proving in-graph accumulation is real), `test_symint_roundtrip`, `test_resize_hook`; shared per-element tolerance `sdpa_within_tol` (abs 1e-4 OR rel 1e-3). - `test/test_build_webgpu.sh`: export the replay / dynamic / in-graph-cache models for the native test. Authored with assistance from Claude. ghstack-source-id: 393014582 @exported-using-ghexport Differential Revision: [D107595144](https://our.internmc.facebook.com/intern/diff/D107595144/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20260
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…near_q4gsw) (#20262) This PR was created by the merge bot to help merge the original PR into the main branch. ghstack PR number: #20226 by @JulianCloudNTH ^ Please use this as the source of truth for the PR details, comments, and reviews ghstack PR base: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/23/base ghstack PR head: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/23/head Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/20/orig Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/23/orig Differential Revision: [D108312283](https://our.internmc.facebook.com/intern/diff/D108312283/) @diff-train-skip-merge --------- Co-authored-by: Julian Ng-Thow-Hing <juliannth@meta.com>
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #20087 by @JulianCloudNTH
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/20/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/20/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/19/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/20/orig
@diff-train-skip-merge