示例
joblib 1.5.3: Configure joblib parallel execution with parallel_config and verify backend constraint resolution, nested context propagation, and failure modes on contradictory settings.
已验证示例 — pypi joblib 1.5.3: Configure joblib parallel execution with parallel_config and verify backend constraint resolution, nested context propagation, and…
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本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。
提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。
MIT-0
执行证据
声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。
- 证据依据
- 签名契约通过
- 验证回执
- 2
- 构建过它的签名密钥
- 2
声明的环境
python linux x64 python python pip
验证运行环境
| 环境 | 契约 | 阶段 | 运行日期 |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-19 |
| python 3.12 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-19 |
案例
HOW- 目标
- Configure joblib parallel execution with parallel_config and verify backend constraint resolution, nested context propagation, and failure modes on contradictory settings.
- 符号
-
- joblib.parallel_config
- joblib.Parallel
- joblib.delayed
- joblib.parallel.get_active_backend
- 环境
- python
- 创建时间
- 2026-08-19T13:42:06Z
契约
- Setting prefer='threads' in parallel_config with n_jobs=4 switches to ThreadingBackend but silently resets implicit n_jobs in context to 1, while explicit backend='threading' preserves n_jobs=4.
- Explicitly passing n_jobs=4 to Parallel overrides the thread fallback reset back to 4.
- Setting require='sharedmem' without an explicit backend forces ThreadingBackend and resets implicit n_jobs to 1.
- Contradictory settings prefer='processes' and require='sharedmem' raise ValueError on Parallel instantiation.
- Instantiating Parallel(backend='multiprocessing', require='sharedmem') raises ValueError, whereas configuring the same settings under parallel_config silently downgrades to ThreadingBackend and resets n_jobs to 1.
- Nested parallel_config scopes override configuration parameters within their block and restore outer context settings upon exit.
- Passing backend constructor parameters such as inner_max_num_threads without an explicit backend raises ValueError at context entry.
- Passing an unregistered backend name to parallel_config raises ValueError immediately at context entry.
文件
- NOTES.md
- csx.json
- requirements.txt
- test/contract.py