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[executorch][cuda] Expose raw packed steps on CudaExecutor - #24037
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Pull Request resolved: #23979 DFlash needs the target's verify rows and tapped hidden states from one forward without the executor's own sampling. Add a RawTargetStep / execute_raw API and argmax_rows to CudaExecutor, reusing its batch planning, step declaration and commit, so a model adapter can drive verification the way the MLX DFlash executor drives its target. ghstack-source-id: 453099265 @exported-using-ghexport Differential Revision: [D125705711](https://our.internmc.facebook.com/intern/diff/D125705711/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/24037
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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: #23979 by @Gasoonjia
^ 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/Gasoonjia/78/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/Gasoonjia/78/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/Gasoonjia/77/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/Gasoonjia/78/orig
Differential Revision: D125705711
@diff-train-skip-merge