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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughRubin NVFP4 fused FC12 now supports SwiGLU and SiTU activation modes. Activation parameters flow through the public operator, runner, tactic keys, autotuner, and generated kernel. Backend selection and tests cover FC12 SiTU execution and degradation rules. ChangesRubin FC12 activation support
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant TorchOperator
participant FC12Runner
participant Autotuner
participant RubinKernel
participant ActivationEpilogue
TorchOperator->>FC12Runner: pass activation type and beta values
FC12Runner->>Autotuner: identify configured workload
FC12Runner->>RubinKernel: execute fused FC12
RubinKernel->>ActivationEpilogue: dispatch SiTU or SwiGLU
ActivationEpilogue-->>TorchOperator: return fused output
Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 33 functions across 6 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title follows the required [None][feat] format and clearly identifies the main change: adding SiTU support to the Rubin FC12 MoE backend. Description check The description includes the required Description, Test Coverage, and PR Checklist sections. It clearly explains the motivation, implementation, tests, validation results, and remaining CI status.
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In `@tests/unittest/_torch/moe/test_kimi_k3_situ_moe.py`:
- Around line 1723-1726: Update the FC12 test’s skip condition to also require
the explicit MoED.CUTEDSL_RUBIN capability, while preserving the existing CUDA
and SM107 checks and skip reason.
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tensorrt_llm/_torch/custom_ops/cute_dsl_custom_ops.pytensorrt_llm/_torch/cute_dsl_kernels/rubin/moe/rubin_contiguous_grouped_blockscaled_gemm_fused_fc12.pytensorrt_llm/_torch/moe/fused_moe/fused_moe_cute_dsl_fc12.pytests/integration/test_lists/test-db/l0_b200.ymltests/unittest/_torch/moe/test_kimi_k3_situ_moe.pytests/unittest/_torch/moe/test_moe_backend.pytests/unittest/_torch/moe/test_moe_impl.py
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Blocked for Rubin 1.3 on two mechanical items. Please update the FC12 SiTU test skip condition to require explicit |
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One correctness guard must be fixed before re-review.
The FC12 SiTU test currently gates on CUDA and SM107 but not on the explicit MoED.CUTEDSL_RUBIN capability it exercises. Please add that capability requirement while preserving the existing architecture checks, then resolve the main conflict and rerun the focused Rubin backend/shape and real-kernel tests. This is required for this PR; otherwise unsupported configurations can enter a capability-specific test path.
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Approved on functionality; the bot’s remaining test-guard item is non-blocking.
The Rubin FC12 SiTU implementation has focused backend/shape coverage and reported real-kernel plus CUDA-graph validation. Adding MoED.CUTEDSL_RUBIN to the test skip condition is worthwhile test hygiene, but it does not invalidate the supported SM107 path. The branch still must resolve its main conflict before merge.
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…u-main Signed-off-by: Xin Guan <294044352+xguannv@users.noreply.github.com>
Signed-off-by: Xin Guan <294044352+xguannv@users.noreply.github.com>
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Description
PR #18357 added the Rubin FC12 MoE backend, but its fused epilogue supports only SwiGLU. Kimi K3 uses SiTU, so the resolver cannot select FC12 for those MoE layers.
This change:
Existing SwiGLU and clamp behavior remains supported. Setting a workload identity now makes FC12 preparation prime both fused tile sizes before the outer CUDA Graph capture; this applies to SwiGLU as well as SiTU. The Rubin and Blackwell packed SiTU epilogues cross-reference each other for future numerical fixes. The Kimi K3 deployment guide lists SM107
CUTEDSL_FC12NVFP4 routed-expert SwiGLU/SiTU kernel support separately from full-model deployment support. The MoE developer guide also lists FC12 SwiGLU/SiTU support.Test Coverage
Added tests cover:
Four GPU-free FC12 test functions are individually registered in
l0_b200.yml. The CPU-onlytest_fc12_pinned_activation_supportis covered by theunittest/_torch/moeentry inl0_cpu.yml.Validation:
2d5df31decaab2ec8b50e3ceaf4ba3121c6899fcafter merging main1ab9f5525e4a7b0f1271fe2c5fd01a4dac7cc7c8.cpu_onlypinned-activation cases. The current head867958b35c77347bd0f1fe44a32b84155396a9d7changes only that test-list entry; YAML parsing, test-list checks,git diff --check, local pre-commit, and DCO passed. CPU-lane execution and full CI rerun on this head are pending.batch-xdr): build job714750onhecate0162and focused validation job715078onhecate0026bothCOMPLETED 0:0at head2d5df31decaab2ec8b50e3ceaf4ba3121c6899fc, withlibtensorrt_llm.soSHA256e33047eb2351e2f6e56a8d70b67a93c4c45584edac0bcc9fdf347e64b945e2c6. FC12 identity 4 passed, backend contracts 17 passed / 10 skipped, SiTU beta validation 12 passed, and the real FC12 SiTU/CUDA Graph test passed.0.986636, relative L20.163448(existing bound<0.20),|k|/|ref|=0.999502. Its incorrect plain-SwiGLU reference scores cosine0.983305, relative L20.210543.CUTEDSLeach score cosine0.986727, relative L20.162821,|k|/|ref|=0.998570; FC12 vs two-op scores cosine1.000000, relative L20.000000to six printed decimals. The diagnostic uses the current production Rubin finalize call; no product code or numerical threshold was changed.PR Checklist
Please review the following before submitting your PR:
PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.
PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.
Test cases are provided for new code paths (see test instructions)
If PR introduces API changes, an appropriate PR label is added - either
api-compatibleorapi-breaking. Forapi-breaking, includeBREAKINGin the PR title.Any new dependencies have been scanned for license and vulnerabilities
CODEOWNERS updated if ownership changes
Documentation updated as needed
Update tava architecture diagram if there is a significant design change in PR.
The reviewers assigned automatically/manually are appropriate for the PR.
Please check this after reviewing the above items as appropriate for this PR.
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