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[NVBug 6980441] Fix Diffusers subfolder ModelOpt state restoration - #2971
yingguo-trt merged 3 commits into
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Signed-off-by: yingguo-trt <[email protected]>
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Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 4 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: fixing Diffusers ModelOpt state restoration when loading from a subfolder. 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. Security Anti-Patterns PASS. The reviewed range changes only the Diffusers/Hugging Face path handling and tests. No changed Python line adds torch.load(..., weights_only=False), numpy.load(..., allow_pickle=True), hardcoded… Full details: Security Anti-Patterns
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Explanation
PASS. The reviewed range changes only the Diffusers/Hugging Face path handling and tests. No changed Python line adds torch.load(..., weights_only=False), numpy.load(..., allow_pickle=True), hardcoded trust_remote_code=True, eval/exec on external input, or # nosec. The dependency files have no additions.
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Actionable comments posted: 1
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Inline comments:
Review comments at @modelopt/torch/opt/plugins/huggingface.py:
- Line 74: Update the handling of try_to_load_from_cache so only a string path
is returned; convert non-path results, including the cached-missing sentinel, to
an empty string before passing the result to os.path.isfile.
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📒 Files selected for processing: 2
modelopt/torch/opt/plugins/diffusers.pymodelopt/torch/opt/plugins/huggingface.py
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #2971 +/- ##
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- Coverage 79.58% 79.04% -0.54%
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Files 659 659
Lines 74602 74604 +2
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- Hits 59372 58972 -400
- Misses 15230 15632 +402
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Signed-off-by: yingguo-trt <[email protected]>
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Bot review (gpt-6.1-sol) — DM the bot to share feedback.
Changes requested: the fix looks sound, but the silent-loss-of-quantizers regression has no checked-in test.
Needs action:
- Add a subfolder round-trip regression in
tests/unit/torch/opt/plugins/test_diffusers_save_load.py, using the existing state/output tester and a parent without weights; see inline comment. - Add mocked cache-lookup tests in
tests/unit/torch/opt/plugins/test_hf_patching.pyfor subfolder filenames, cached paths, cache misses, and the negative-cache sentinel.
No action needed:
- The change reuses the existing restoration helper and preserves default lookup and saving behavior. The reported standalone reproducer supports the fix, but does not protect CI against regressions.
Signed-off-by: yingguo-trt <[email protected]>
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LGTM: prior correctness and coverage concerns are resolved; human sign-off remains for the justified existing-test extension.
Needs action:
- Confirm the
test_unet_save_restoreextension intests/unit/torch/opt/plugins/test_diffusers_save_load.py: it retains direct-directory coverage and state/output assertions while adding offline subfolder loading.
No action needed:
- ✔️ Resolved since the last review: negative-cache sentinel handling, the subfolder round-trip regression, and mocked cache-lookup coverage.
- The fix reuses the shared restoration helper and preserves default lookup and saving behavior.
- Tests were inspected, not executed during this review.
What does this PR do?
Type of change: Bug fix
Loading a Diffusers component with
from_pretrained(parent, subfolder="unet")finds its weights in the component directory, but ModelOpt still looks formodelopt_state.pthin the parent directory. The load can succeed while dropping the saved quantizers.Pass the component subfolder through ModelOpt's state lookup for local directories and existing Hub cache entries. Calls without
subfolderand checkpoint saving retain their existing behavior; no download behavior is added.Usage
Testing
Local CPU environment: Python 3.12.10, PyTorch 2.12.0+cpu, Diffusers 0.40.0, Transformers 5.5.4.
test_diffusers_save_load.py::test_unet_save_restore: 2 passed, covering direct-directory and parent + subfolder loading with the existing ModelOpt state/output assertions. The parent contains no component weights.test_hf_patching.py::test_get_modelopt_state_path_cached: 4 passed, covering the default filename, subfolder cache hit, cache miss, and negative-cache sentinel with a mocked Hub cache lookup.845dc9b16d, while the direct case passes; the negative-cache case fails against26b987f9eb, while the other three cache cases pass. All six pass with the current source (UNet calls: 0.31s / 0.21s).tests/unit/torch/opt/plugins/test_transformers_save_load.py::test_causal_lm_save_restore: 2 passed (LlamaForCausalLMandAutoModelForCausalLM).Validation ran offline on CPU. A separate temporary probe also verified real on-disk Hub cache hits, misses, and negative entries with and without a subfolder. End-to-end Hub model loading, GPU inference, and other Diffusers architectures were not validated.
Before your PR is "Ready for review"
Contributor and security guidance reviewed; the commit is signed and signed off.
subfolderretain their behavior.CONTRIBUTING.md: N/A — neither.Additional Information
This change does not alter Diffusers' weight selection when both the parent and component directory contain same-named weights; that separate directory-layout edge case is discussed in huggingface/diffusers#7140.
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