# Page Not Found

The URL `5-1` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [5-1](https://windmising.gitbook.io/liu-yu-bo-play-with-machine-learning/src/chapter5-1/5-1.md)
- [5-10 线性回归的可解释性和更多思考](https://windmising.gitbook.io/liu-yu-bo-play-with-machine-learning/src/chapter5-2/5-10.md)
- [5-9 scikit-learn中的回归算法](https://windmising.gitbook.io/liu-yu-bo-play-with-machine-learning/src/chapter5-10/5-9.md)
- [线性回归算法](https://windmising.gitbook.io/liu-yu-bo-play-with-machine-learning/src/chapter5/5-0.md)
- [第六章：梯度下降法](https://windmising.gitbook.io/liu-yu-bo-play-with-machine-learning/src/chapter6/6-1.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://windmising.gitbook.io/liu-yu-bo-play-with-machine-learning/src/chapter5-1/5-1.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://windmising.gitbook.io/liu-yu-bo-play-with-machine-learning/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://windmising.gitbook.io/liu-yu-bo-play-with-machine-learning/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/liu-yu-bo-play-with-machine-learning/src/chapter5-1/5-1.md`).

You may also use `Accept: text/markdown` header for content negotiation.