模型行为测试
检查不变性和方向性预期
模型行为测试 是 CoddyKit 上的免费 MLOps Academy 课时。 这是第 2 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 MLOps Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 MLOps Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Beyond a Single Accuracy Number
One accuracy score hides how a model truly behaves. Behavioral tests probe how predictions react when you change the input on purpose.
Treat the Model as a Black Box
Behavioral tests check inputs and outputs only, ignoring the model internals. This black-box view works for any framework you serve.
Invariance Tests
Some changes should not move the prediction at all. An invariance test swaps a neutral word and asserts the output stays the same.
assert predict("great hotel") == predict("great motel")Directional Expectation Tests
Other changes should move output a known way. A directional test adds a positive word and asserts the score goes up, not down.
assert predict("good") < predict("very good")Minimum Functionality Tests
Check the easy cases a model must never miss. A minimum functionality test asserts an obvious example gets the obvious label.
From the CheckList Idea
These three test types come from the CheckList paper for NLP. The pattern generalizes to tabular, vision, and any model you ship.
Test Fairness Slices
Run the same case across groups. A slice test asserts prediction quality stays steady when only a sensitive attribute changes.
Robustness to Noise
Add a typo or jitter a number and the label should hold. A robustness test guards against tiny, harmless perturbations.
assert predict("hotle") == predict("hotel")Pin a Known Prediction
Lock the output for a fixed example so retrains do not drift it silently. This regression test flags surprise behavior changes.
Wire Them Into pytest
Behavioral tests are ordinary pytest functions. They live beside your data tests and run in the same CI step on every push.
def test_invariance(model):
assert model.predict(a) == model.predict(b)Tests Encode Your Specs
Each behavioral test is a written rule the model must obey. Together they form a living specification of expected behavior.
Quick Check
Adding a stronger positive word should raise a sentiment score. Which test is that?
Recap: Probe Behavior, Not Just Scores
You now run behavioral tests: invariance, directional, and minimum functionality cases that turn expected model behavior into checks CI enforces. ✅
常见问题解答
「模型行为测试」课时是免费的吗？
是的 — 「模型行为测试」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 MLOps Academy 课程的其余内容，请升级到 CoddyKit PRO。 MLOps Academy 课程共包含 4 节课。
「模型行为测试」这节课中我会学到什么？
检查不变性和方向性预期 你通过在浏览器中直接运行的动手代码来练习 MLOps Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 MLOps Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 MLOps Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 2 节课，共 4 节。
「模型行为测试」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 MLOps Academy 课中编写并运行代码吗？
能。每节 MLOps Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。