# Page Not Found

The URL `di-si-bu-fen-qian-yan-yu-shi-jian-pian/12_encoder_models` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [第十二章：编码器系列模型](https://yeasy.gitbook.io/llm_internals/di-si-bu-fen-mo-xing-yu-qian-yan-pian/12_encoder_models.md)
- [第十三章：解码器系列与主流 LLM](https://yeasy.gitbook.io/llm_internals/di-si-bu-fen-mo-xing-yu-qian-yan-pian/13_decoder_models.md)
- [12.1 BERT：双向理解的突破](https://yeasy.gitbook.io/llm_internals/di-si-bu-fen-mo-xing-yu-qian-yan-pian/12_encoder_models/12.1_bert.md)
- [12.2 RoBERTa、ALBERT 与 ELECTRA：BERT 的改进之路](https://yeasy.gitbook.io/llm_internals/di-si-bu-fen-mo-xing-yu-qian-yan-pian/12_encoder_models/12.2_roberta_albert.md)
- [本章小结](https://yeasy.gitbook.io/llm_internals/di-si-bu-fen-mo-xing-yu-qian-yan-pian/12_encoder_models/summary.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://yeasy.gitbook.io/llm_internals/di-si-bu-fen-mo-xing-yu-qian-yan-pian/12_encoder_models.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://yeasy.gitbook.io/llm_internals/sitemap.md

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

### Option 3 — Retrieve the full documentation corpus

Full export: https://yeasy.gitbook.io/llm_internals/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., `/llm_internals/di-si-bu-fen-mo-xing-yu-qian-yan-pian/12_encoder_models.md`).

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