Sample
Handle closure serialization failures and backend fallback when switching joblib from loky to multiprocessing
sha256:7786cfc40f400486765033eec7c04f3a21347d8f8513d308a4911a5ce6363569
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- Goal
- Handle closure serialization failures and backend fallback when switching joblib from loky to multiprocessing HOW
- Packages
- joblib 1.5.3
- Environment
- python
- Created
- 2026-08-15T17:14:38Z
Contract
- assert jp.DEFAULT_BACKEND == 'loky' and isinstance(jp.get_active_backend()[0], jp.LokyBackend)
- assert 'loky' in loky_ctx.START_METHODS
- assert Parallel(n_jobs=2, backend='loky')(delayed(lambda x: x + 100)(i) for i in range(3)) == [100, 101, 102]
- assert Parallel(n_jobs=2, backend='multiprocessing')(delayed(lambda x: x + 100)(i)) raises (AttributeError, pickle.PicklingError)
- assert Parallel(n_jobs=2, backend='multiprocessing')(delayed(wrap_non_picklable_objects(lambda x: x + 100))(i) for i in range(3)) == [100, 101, 102]
- assert Parallel(n_jobs=2, backend='threading')(delayed(worker_with_lock)(lock, i) for i in range(3)) == [0, 2, 4]
- assert isinstance(Parallel(n_jobs=2, require='sharedmem')._backend, jp.ThreadingBackend)
- assert Parallel(backend='multiprocessing', require='sharedmem') raises ValueError
Files
- NOTES.md
- csx.json
- pyproject.toml
- requirements.lock
- requirements.txt
- test/contract.py
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- python 3.12 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-15 · ed25519:d91480838ac982c9