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使用 params.yaml 参数化运行

无需修改代码即可搜索超参数

使用 params.yaml 参数化运行 是 CoddyKit 上的免费 MLOps Academy 课时。 这是第 4 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。

Stop Editing Code to Tune

Changing a learning rate by editing train.py is messy and hard to track. DVC reads settings from a file called params.yaml instead. 🎛️

What params.yaml Holds

The params.yaml file is plain YAML holding your hyperparameters, grouped by stage. It becomes the single place to change run settings.

train:
  learning_rate: 0.01
  epochs: 20
prep:
  test_size: 0.2

Declare Params in a Stage

Tell a stage which params it uses with the -p flag. DVC then watches those values for changes, just like file dependencies.

dvc stage add -n train \
  -p train.learning_rate,train.epochs \
  -d data/prepared python train.py

Read Params in Python

In your script, load the YAML and pull the values you need. The code stays generic while the numbers live in params.yaml.

import yaml
p = yaml.safe_load(open("params.yaml"))
lr = p["train"]["learning_rate"]

Change a Value, Re-Run

Edit a param and run dvc repro. DVC sees the value changed and re-runs only the stages that declared that param.

Override Params from the CLI

You can override a value for one run without editing the file using dvc exp run --set-param. Great for quick what-if checks.

dvc exp run --set-param train.epochs=50

Sweep with Experiments

DVC experiments let you queue many param combinations at once, so you can sweep a grid of values without touching code.

dvc exp run --set-param train.learning_rate=0.001
dvc exp run --set-param train.learning_rate=0.1

Compare Runs in a Table

Run dvc exp show to see every experiment's params and metrics side by side. Spotting the best combination becomes a glance.

dvc exp show

Pair Params with Metrics

Declare your output scores as metrics so DVC links each param set to its result. Tuning then becomes a clear cause-and-effect.

Params Live in Git Too

Because params.yaml is text, every tuning change is captured in Git history. You always know which settings produced which model.

Reproducible Sweeps

With params in a file and outputs as metrics, anyone can rerun your exact sweep and get the same numbers. That is real reproducibility.

Quick Check

Recall how params drive re-runs.

Recap: Parameterized Runs

You moved settings into params.yaml, declared them per stage, and swept values with experiments. Tuning is now code-free and reproducible. 🧪

常见问题解答

「使用 params.yaml 参数化运行」课时是免费的吗？

是的 — 「使用 params.yaml 参数化运行」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。

「使用 params.yaml 参数化运行」这节课中我会学到什么？

无需修改代码即可搜索超参数 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 4 节课，共 4 节。

「使用 params.yaml 参数化运行」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。

此课程中的所有课时

  1. 阶段：摄取、准备、训练、评估
  2. 使用 DVC 阶段定义流程
  3. 缓存并跳过未改变的步骤
  4. 使用 params.yaml 参数化运行
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