[Bugfix] do not treat weight filenames as custom proposer paths - #55393
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Dotted names like draft.pt matched the custom_class import heuristic and forced method=custom_class. Exclude common weight/config suffixes. Signed-off-by: Taksh <takshkothari09@gmail.com>
Signed-off-by: Taksh <takshkothari09@gmail.com>
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📝 SummarySummary by CodeRabbit
WalkthroughThe change prevents dotted weight and configuration filenames from being classified as custom proposer import paths. Tests cover supported file extensions and valid Python module/class paths. ChangesSpeculative proposer path detection
Estimated code review effort: 1 (Trivial) | ~5 minutes Merge Risk: 🔵 Low · up to The change correctly avoids treating common weight filenames as custom proposer paths, but custom proposer import paths with suffix-colliding final identifiers may no longer be auto-detected and can be configured as draft models. Clarify the explicit custom-class configuration requirement or preserve this import-path case before merge. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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In `@vllm/config/speculative.py`:
- Around line 1074-1086: Update _is_custom_proposer_path to detect custom
proposer paths case-insensitively, so suffixes such as .JSON and .PT remain
recognized regardless of casing. Preserve __post_init__ behavior for method=None
and ensure ModelConfig does not reinterpret these paths as draft model names;
add a regression test covering the colliding suffixes.
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tests/config/test_speculative_custom_path.pyvllm/config/speculative.py
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Verified locally on head 969e4c4 (CPU host) — regression-proven and edge-checked.
Bug real on base (main): SpeculativeConfig._is_custom_proposer_path("draft.pt") returned True (["draft","pt"] both identifiers, no slash, no scheme) → __post_init__ auto-set method="custom_class" for what is a bare weight filename, sending the loader down the import path (Cannot import module 'draft' class of failure, same family as #48754/#51338). Executed on base: all three of the PR's filename cases → True.
Fix verified on head: the extension denylist returns False for draft.pt, model.safetensors, eagle.weights, config.json → inference falls through to the draft_model default. Case-insensitivity works (EAGLE.pt, Draft.PT → False, verified). Multi-dot suffix handling is sound (.npz.index literal in the tuple works; .safetensors.index.json → False via .json).
Regression-proven: transplanted the test file onto base → test_weight_filenames_are_not_custom_proposer_paths FAILS there (True == not expected) / PASSES on head; test_python_import_paths_still_detected passes on both. No regression surface: inference only runs when method is None, so anyone with a genuine custom module whose dotted name ends in a listed suffix can pass method=custom_class explicitly; real import paths (my_module.MyProposer, pkg.sub.Proposer) are unaffected.
Non-blocking residual gap (executed probe matrix on head): the denylist is open-ended — bare weight/config filenames with other common extensions are still misclassified as custom paths: qwen3.gguf → True, draft.h5 → True, draft.pkl → True, draft.hdf5 → True, draft.tar.gz → True, foo.bin.index → True. Since these are all CWD-relative existing-file scenarios, an os.path.isfile(model) check for slash-free names would close the whole class at once (an existing file is definitionally not an import path); alternatively extend the tuple with .gguf, .h5, .hdf5, .pkl, .tar.gz. Not blocking — the reported cases are fixed and strictly additive.
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Summary
draft.pt/model.safetensors/eagle.weightsincorrectly forcedmethod=custom_class.Test plan
tests/config/test_speculative_custom_path.py