[TRTLLM-14839][chore] Add shim files for root PEFT module relocation by lori-ren · Pull Request #17857 · NVIDIA/TensorRT-LLM

lori-ren · 2026-08-18T02:11:27Z

Dev Engineer Review

Added compatibility shims for relocated PEFT modules.
Re-exported legacy public APIs from their canonical _torch.peft modules.
Added FutureWarning messages with replacement module paths.
Preserved restricted pickle deserialization for legacy module paths.
Added CODEOWNERS entries for all three shim modules.
Changes are consistent with the stated migration purpose. No performance or error-handling regressions are apparent.

QA Engineer Review

Added:
- test_published_names_come_from_where_they_are_defined
- test_import_warns_once_and_names_the_new_path
- test_the_restricted_unpickle_allowlist_still_accepts_the_old_module_strings
No tests/integration/test_lists/ files were modified.
The tests are not listed in test-db/ or qa/.
Verdict: sufficient.

Description

The follow-up for PR #17806: create absent shim files for compatibility:

lora_helper.py -> _torch/peft/lora/config.py
lora_manager.py -> _torch/peft/lora/loaders.py for checkpoint loading + _torch/peft/lora/manager.py for runtime adapter management
prompt_adapter_manager.py -> _torch/peft/prompt_adapter.py

This PR shall be rebased and merged AFTER #17806 is merged

Test Coverage

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.
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CODEOWNERS updated if ownership changes
Documentation updated as needed
Update tava architecture diagram if there is a significant design change in PR.
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…modules Signed-off-by: Lori Ren <lorir@nvidia.com>

lori-ren · 2026-08-19T01:31:31Z

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coderabbitai · 2026-08-19T01:33:18Z

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tensorrt_llm/lora_helper.py

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Walkthrough

Added compatibility shims for legacy LoRA and prompt-adapter modules. The shims re-export canonical APIs and emit migration warnings. Restricted pickle deserialization accepts legacy LoraConfig paths. Tests verify forwarding, warnings, and allowlist behavior.

Changes

PEFT compatibility

Layer / File(s)	Summary
Legacy forwarding modules `tensorrt_llm/lora_helper.py`, `tensorrt_llm/lora_manager.py`, `tensorrt_llm/prompt_adapter_manager.py`, `.github/CODEOWNERS`	Legacy modules re-export canonical PEFT APIs, emit `FutureWarning` messages, define `__all__`, and receive runtime-team ownership.
Legacy pickle allowlist `tensorrt_llm/llmapi/serialization.py`	Restricted deserialization accepts `LoraConfig` under the historical module paths.
Compatibility validation `tests/unittest/_torch/peft/test_shim_peft.py`	Tests verify object identity, one warning per shim, canonical module paths, and legacy deserialization strings.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🟡 Moderate · up to 9e71a

The PR adds PEFT compatibility shims and updates serialization handling, but its tests do not exercise the restricted deserialization authorization path; merge should wait for that security-relevant check or explicit owner acceptance.

Sequence Diagram(s)

sequenceDiagram
  participant LegacyCaller
  participant CompatibilityShim
  participant CanonicalPEFTModule
  LegacyCaller->>CompatibilityShim: import legacy PEFT module
  CompatibilityShim->>LegacyCaller: emit FutureWarning
  CompatibilityShim->>CanonicalPEFTModule: re-export canonical objects
  CanonicalPEFTModule-->>LegacyCaller: provide identical objects

Suggested reviewers: schetlur-nv, bowenfu, brnguyen2, cascade812, tongyuantongyu

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the addition of shim files for relocated root PEFT modules and follows the required ticket and type format.
Description check	✅ Passed	The description explains the shim scope and dependency on PR `#17806`, but the Test Coverage section is empty despite tests being added.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@tests/unittest/_torch/peft/test_shim_peft.py`:
- Around line 86-99: Add behavioral checks to
test_the_restricted_unpickle_allowlist_still_accepts_the_old_module_strings by
invoking the restricted unpickler’s find_class for both legacy module paths,
tensorrt_llm.lora_helper and tensorrt_llm.lora_manager, and assert each resolves
to the canonical LoraConfig class. Keep the existing BASE_EXAMPLE_CLASSES
source-table assertions.

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📒 Files selected for processing (6)

.github/CODEOWNERS
tensorrt_llm/llmapi/serialization.py
tensorrt_llm/lora_helper.py
tensorrt_llm/lora_manager.py
tensorrt_llm/prompt_adapter_manager.py
tests/unittest/_torch/peft/test_shim_peft.py

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tensorrt-cicd · 2026-08-19T01:38:11Z

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YihuiLu512

LGTM

…m its shim Signed-off-by: Lori Ren <lorir@nvidia.com>

lori-ren · 2026-08-19T02:46:26Z

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PR_Github #67243 [ run ] completed with state SUCCESS. Commit: 9e71a2c
/LLM/main/L0_MergeRequest_PR pipeline #54771 completed with status: 'FAILURE'

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lori-ren · 2026-08-19T04:43:33Z

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PR_Github #67280 [ run ] completed with state SUCCESS. Commit: 9e71a2c
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CI Report

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…racker IDs Two comments this PR adds cited internal Jira IDs. A reader of the public repository cannot open those; the PR number is the reference they can follow, and it is where the reasoning actually lives. See TRTLLM-14844. -> See PR NVIDIA#17968 for the discussion. -- TRTLLM-14558 moved these ... -> -- PR NVIDIA#17968 moved these ... Scope is what this PR introduces. The pre-existing "Epic TRTLLM-14558" mention in the compatibility-forwarding block came from NVIDIA#17857 and is left alone, as are the tracker IDs in the other 70 files that carry them -- including pull_request_template.md and pr-check.yml, which exist to require the ID in the title. Commit and PR titles keep the ID, per the repository's own format rule. Signed-off-by: Yihui Lu <269394165+YihuiLu512@users.noreply.github.com>

github-actions Bot assigned lori-ren Aug 18, 2026

lori-ren changed the title ~~Layout/t09 torch peft shim~~ [TRTLLM-14839][chore] Add shim files for root PEFT module relocation Aug 18, 2026

lori-ren added the api-compatible Accepted LLM API contract change that is backwards-compatible label Aug 18, 2026

BowenFu mentioned this pull request Aug 18, 2026

[TRTLLM-14839][chore] Relocate root PEFT modules into _torch/peft/ #17806

Merged

1 task done

[TRTLLM-14839][chore] Add compatibility shims for the relocated PEFT …

4c4bc1c

…modules Signed-off-by: Lori Ren <lorir@nvidia.com>

lori-ren force-pushed the layout/T09-torch-peft-shim branch from 3e38660 to 4c4bc1c Compare August 19, 2026 01:28

lori-ren marked this pull request as ready for review August 19, 2026 01:30

lori-ren requested review from a team as code owners August 19, 2026 01:30

lori-ren requested review from BowenFu, cascade812, schetlur-nv, tongyuantongyu, yiqingy0 and yuanjingx87 August 19, 2026 01:30

coderabbitai Bot reviewed Aug 19, 2026

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Comment thread tests/unittest/_torch/peft/test_shim_peft.py Resolved

BowenFu approved these changes Aug 19, 2026

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YihuiLu512 approved these changes Aug 19, 2026

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[TRTLLM-14839][chore] Publish lora_helper's full pre-move surface fro…

9e71a2c

…m its shim Signed-off-by: Lori Ren <lorir@nvidia.com>

chzblych approved these changes Aug 19, 2026

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lori-ren enabled auto-merge (squash) August 19, 2026 04:43

BowenFu approved these changes Aug 19, 2026

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lori-ren merged commit ab6fdcf into NVIDIA:main Aug 19, 2026
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