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[executorch][cuda] Grow sequence-layout ring layers on demand - #24884

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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: #24076 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/94/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/Gasoonjia/94/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/Gasoonjia/95/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/Gasoonjia/94/orig
Differential Revision: D126851225
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Pull Request resolved: #24076

A ring layer cannot wrap before it holds all its slots, so until then it grows with the flat layers instead of allocating window + max_write - 1 rows per sequence up front. Growable layers now cap at their own declared rows.
ghstack-source-id: 469359765
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Differential Revision: [D126851225](https://our.internmc.facebook.com/intern/diff/D126851225/)
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pytorch-bot Bot commented Nov 11, 2026 •

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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/24884

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure, 3 Pending

As of commit 213958c with merge base 4eb094b (image):

NEW FAILURE - The following job has failed:

  • pull / unittest / macos / macos-job (gh)
    examples/models/muse-glimmer/tests/test_cuda_sequence_export_inputs.py::SequenceExportInputsTest::test_small_logits_example_preserves_token_and_embedding_capacity

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@meta-cla meta-cla Bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Nov 11, 2026
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pytorchbot deployed to upload-benchmark-results November 11, 2026 06:46 — with GitHub Actions Active

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upload-benchmark-results — 213958cd Deployed Nov 11, 2026 by pytorchbot via upload-benchmark-results #22293
cadence — 213958cd Deployed Nov 11, 2026 by pytorchbot via hifi-op-test / hifi4 #37754
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