[TRTLLM-14880][feat] qualify Qwen3 dense for MX by chienchunhung · Pull Request #17142 · NVIDIA/TensorRT-LLM

chienchunhung · 2026-07-31T20:14:25Z

Summary

Add a fail-closed post-transform qualification profile for Qwen3 dense target models.
Reuse the finalized dense BF16 runtime support matrix from [TRTLLM-14879][feat] qualify Qwen2 dense for MX #16974 while assigning Qwen3 a distinct transform-layout ABI and realized RoPE constraint.
Qualify the Q/K-normalized attention lifecycle, fused QKV and gate-up layouts, default fused QK-norm/RoPE path, and untied language-model head.
Add TP1 and rank-local TP2 lifecycle coverage, shared runtime rejection coverage, source-identity ABI coverage, and support documentation.
Extend the ModelExpress donor/receiver CI harness with Qwen2-7B-Instruct and Qwen3-8B TP1 and TP2 cases.
Rebase onto main after [TRTLLM-14879][feat] qualify Qwen2 dense for MX #16974 and [TRTLLM-14727][test] Create MX donor-receiver qualification test harness #17222 merged, so this PR now contains only its Qwen3 and shared CI-coverage delta.

Qualified Scope

Exact root/config identity: Qwen3ForCausalLM / qwen3
Target-model post-transform transfer
Dense BF16 with unquantized weights and KV cache
TRTLLM attention with default fused QK-norm/RoPE
TP1 and TP2
PP1 and CP1
Untied embeddings and no speculative mode or separately loaded draft model

The dense root does not consume MoE-only backend or partition settings, so the profile does not constrain them; SourceIdentity still requires donor and receiver configurations to match. Unsupported combinations fail closed, including FP16, quantization, alternate attention backends, TP greater than 2, PP/CP expansion, LoRA, sparse attention, attention data parallelism, multi-node execution, tied embeddings, YaRN, disabling the default fused QK-norm/RoPE path, and speculative decoding.

Validation

Added full-load versus staged-load lifecycle equivalence coverage for Qwen3 dense TP1 and both TP2 ranks.
Added Q/K norm, fused-layout, transform-guard, parameter/buffer, deterministic output, and unregistered-root negative coverage.
Extended shared dense runtime rejection and MoE-only-dimension coverage plus SourceIdentity transform-ABI binding checks to Qwen3.
Added Qwen2 and Qwen3 TP1 cases to DGX_H100-2_GPUs-PyTorch-ModelExpress-1 and TP2 cases to DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1.
Changed-file pre-commit hooks: passed.
Test-list duplicate and AST validation: passed (2,062 unique entries).
Test-to-stage mapping for all four Qwen cases: passed.
Python syntax compilation for all changed Python files: passed.
Focused PyTorch unit tests: pending in a Linux TensorRT-LLM runtime because the local Python environment lacks TensorRT-LLM test dependencies.
Real Qwen2/Qwen3 ModelExpress baseline/donor/receiver and no-disk GPU validation: pending CI.

Dev Engineer Review

Adds a fail-closed Qwen3 dense BF16 post-transform profile.
Supports unquantized weights and KV cache, TP1/TP2, PP1, CP1, untied embeddings, and the required QK-norm/RoPE configuration.
Rejects unsupported runtime variants, including FP16, quantization, alternate attention backends, expanded parallelism, LoRA, sparse attention, tied embeddings, YaRN, and speculative decoding.
Adds and exports QWEN3_DENSE_POST_TRANSFORM_LAYOUT_ABI_V1.
Updates ModelExpress documentation and adds Qwen2/Qwen3 H100 TP1/TP2 coverage.
Pre-commit hooks, test-list validation, stage mapping, and Python syntax compilation passed.
Focused runtime tests and GPU ModelExpress validation remain pending.
ModelExpress helper runs 67559, 67926, 67992, and 68869 passed, but their main pipelines failed. Runs 68014 and 68063 failed in both helper and main pipelines. Run 68382 was aborted. Investigate these failures before rerunning CI.
Configuration values and test-list entries are consistent. No duplicate entries or invalid paths were identified.

QA Engineer Review

Added or modified test functions

tests/unittest/_torch/executor/test_model_loader_mx.py
- Added test_qwen3_dense_profile_qualifies_full_staged_lifecycle.
- Added test_qwen3_dense_profile_qualifies_tp2_rank_lifecycle.
- Modified test_bf16_dense_profiles_reject_unqualified_runtime_variants.
- Modified test_bf16_dense_profiles_reject_wrong_realized_rope_fusion.
- Updated existing Qwen2 lifecycle tests to use generalized dense-Qwen helpers.
tests/unittest/_torch/weight_sharing/test_source_identity.py
- Modified test_from_model_config_binds_transform_abi to include the Qwen3 ABI.
tests/integration/defs/model_express/test_model_express.py
- Extended test_mx_donor_receiver with Qwen2 and Qwen3 TP1/TP2 variants.

Test-list coverage

tests/integration/test_lists/test-db/l0_model_express.yml covers:
- test_mx_donor_receiver[qwen2-bf16-tp1]
- test_mx_donor_receiver[qwen3-bf16-tp1]
- test_mx_donor_receiver[qwen2-bf16-tp2]
- test_mx_donor_receiver[qwen3-bf16-tp2]
The modified unit tests are not listed in the provided CI test-list file.
Verdict: needs follow-up because focused runtime results are unavailable and the reported ModelExpress pipelines failed.

chienchunhung · 2026-08-19T22:53:57Z

/bot run --disable-fail-fast --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

tensorrt-cicd · 2026-08-19T23:41:15Z

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PR_Github #67559 [ run ] completed with state SUCCESS. Commit: e2ecaf6
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moraxu

Feel free to give me permissions to push to your fork, in case there were more commits needed in this branch. I will rebase off main tomorrow to include the fix #17993 for a failure across all stages

moraxu · 2026-08-20T18:36:10Z

/bot run --disable-fail-fast --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

tensorrt-cicd · 2026-08-20T18:42:21Z

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PR_Github #67926 [ run ] completed with state SUCCESS. Commit: c66c548
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moraxu · 2026-08-20T22:34:03Z

/bot run --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

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PR_Github #67992 [ run ] completed with state SUCCESS. Commit: c66c548
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moraxu · 2026-08-20T23:33:35Z

/bot run --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

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PR_Github #68014 [ run ] completed with state FAILURE. Commit: c66c548
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Signed-off-by: Chien-Chun Hung <2679986+chienchunhung@users.noreply.github.com>

Signed-off-by: Michal Guzek <mguzek@nvidia.com>

coderabbitai · 2026-08-24T18:08:00Z

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moraxu · 2026-08-24T18:11:47Z

/bot run --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

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Inline comments:
In `@tensorrt_llm/_torch/weight_sharing/__init__.py`:
- Line 50: Sort the complete __all__ list in the weight-sharing module according
to the configured isort-style ordering, including
QWEN3_DENSE_POST_TRANSFORM_LAYOUT_ABI_V1, and verify the RUF022 warning is
resolved by rerunning Ruff.

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📒 Files selected for processing (8)

docs/source/features/model-express.md
tensorrt_llm/_torch/pyexecutor/model_loader.py
tensorrt_llm/_torch/weight_sharing/__init__.py
tensorrt_llm/_torch/weight_sharing/post_transform_profiles.py
tests/integration/defs/model_express/test_model_express.py
tests/integration/test_lists/test-db/l0_model_express.yml
tests/unittest/_torch/executor/test_model_loader_mx.py
tests/unittest/_torch/weight_sharing/test_source_identity.py

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tests/integration/test_lists/test-db/l0_model_express.yml
tests/integration/defs/model_express/test_model_express.py
tensorrt_llm/_torch/pyexecutor/model_loader.py
docs/source/features/model-express.md
tests/unittest/_torch/weight_sharing/test_source_identity.py
tensorrt_llm/_torch/weight_sharing/post_transform_profiles.py
tests/unittest/_torch/executor/test_model_loader_mx.py

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moraxu · 2026-08-24T20:17:32Z

/bot run --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

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moraxu · 2026-08-25T16:47:39Z

/bot run --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

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moraxu · 2026-08-25T21:07:23Z

/bot run --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

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moraxu · 2026-08-26T05:31:45Z

/bot run --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

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moraxu · 2026-08-26T18:27:05Z

/bot run --extra-stage "DGX_H100-2_GPUs-PyTorch-ModelExpress-1,DGX_H100-4_GPUs-PyTorch-ModelExpress-OnDemand-1"

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kaiyux

Approving the doc changes

github-actions Bot assigned chienchunhung Jul 31, 2026

chienchunhung changed the title ~~[TRTLLM-14727][feat] qualify Qwen3 dense for MX~~ [TRTLLM-14880][feat] qualify Qwen3 dense for MX Jul 31, 2026

chienchunhung force-pushed the codex/mx-qwen3-dense branch from c65eebe to 24bd22c Compare July 31, 2026 23:35

chienchunhung mentioned this pull request Aug 3, 2026

[TRTLLM-14727][test] Create MX donor-receiver qualification test harness #17222

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chienchunhung requested a review from moraxu August 18, 2026 22:17

chienchunhung force-pushed the codex/mx-qwen3-dense branch from 24bd22c to e2ecaf6 Compare August 19, 2026 22:52

moraxu approved these changes Aug 20, 2026

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Comment thread docs/source/features/model-express.md

moraxu force-pushed the codex/mx-qwen3-dense branch from e2ecaf6 to c66c548 Compare August 20, 2026 18:35

moraxu marked this pull request as ready for review August 21, 2026 02:03

moraxu requested review from a team as code owners August 21, 2026 02:03

moraxu requested review from BowenFu, lori-ren and mikeiovine August 21, 2026 02:03

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chienchunhung and others added 3 commits August 24, 2026 10:56

[TRTLLM-14880][feat] qualify Qwen3 dense for MX

4469142

Signed-off-by: Chien-Chun Hung <2679986+chienchunhung@users.noreply.github.com>

Address review comments

559a8eb

Signed-off-by: Michal Guzek <mguzek@nvidia.com>

Address review comments

50ba9f1

Signed-off-by: Michal Guzek <mguzek@nvidia.com>

moraxu force-pushed the codex/mx-qwen3-dense branch from 4de10d4 to 50ba9f1 Compare August 24, 2026 18:07

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Comment thread tensorrt_llm/_torch/weight_sharing/__init__.py

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EmmaQiaoCh approved these changes Aug 25, 2026

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kaiyux approved these changes Aug 27, 2026

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brnguyen2 approved these changes Aug 31, 2026

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moraxu merged commit 6f6f069 into NVIDIA:main Aug 31, 2026
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Summary

Qualified Scope

Validation

Dev Engineer Review

QA Engineer Review

Added or modified test functions

Test-list coverage

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