275 lines
13 KiB
Markdown
275 lines
13 KiB
Markdown
<!-- WEHUB_ZH_README -->
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> [!NOTE]
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> 本文档由 WeHub 基于上游 README 翻译整理,属于社区翻译,非官方中文文档。
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> [English](./README.en.md) · [原始项目](https://github.com/StarTrail-org/PixelRAG) · [上游 README](https://github.com/StarTrail-org/PixelRAG/blob/HEAD/README.md)
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> 原作者、版权与许可证归属以原始项目及本仓库 LICENSE 文件为准。
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<p align="center">
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<img src="docs/assets/banner.png" alt="PixelRAG — 视觉检索增强生成(Visual Retrieval-Augmented Generation)" width="100%">
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</p>
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<p align="center">
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<b><a href="https://arxiv.org/abs/2606.28344">PIXELRAG: Web Screenshots Beat Text for
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Retrieval-Augmented Generation</a></b> 的官方代码库
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</p>
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<p align="center">
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<a href="https://yichuan-w.github.io/">Yichuan Wang</a>*,
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<a href="https://zhifei.li/">Zhifei Li</a>*,
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<a href="https://zwcolin.github.io/">Zirui Wang</a>,
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<a href="https://www.linkedin.com/in/paul-teiletche/">Paul Teiletche</a>,
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<a href="https://www.linkedin.com/in/lesheng-jin-9618b0201/">Lesheng Jin</a>
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<br>
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<a href="https://people.eecs.berkeley.edu/~matei/">Matei Zaharia</a>†,
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<a href="https://people.eecs.berkeley.edu/~jegonzal/">Joseph E. Gonzalez</a>†,
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<a href="https://www.sewonmin.com/">Sewon Min</a>†
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</p>
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<p align="center"><sub>* 同等贡献 † 同等指导</sub><br><sub>工作完成于 <a href="https://sky.cs.berkeley.edu/">Berkeley SkyLab</a> & <a href="https://bair.berkeley.edu/">BAIR</a> & <a href="https://nlp.cs.berkeley.edu/">Berkeley NLP</a></sub></p>
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<p align="center">按文档的<em>外观</em>搜索,而不仅仅看它包含的文字。</p>
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<p align="center">
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<a href="https://github.com/StarTrail-org/PixelRAG/actions/workflows/ci.yml"><img src="https://github.com/StarTrail-org/PixelRAG/actions/workflows/ci.yml/badge.svg" alt="CI"></a>
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<a href="https://pixelrag.ai"><img src="https://img.shields.io/badge/demo-pixelrag.ai-7c3aed" alt="Live demo"></a>
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<a href="https://status.pixelrag.ai"><img src="https://img.shields.io/badge/status-live-22c55e" alt="Status"></a>
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<a href="https://join.slack.com/t/leann-e2u9779/shared_invite/zt-3ol2ww9ic-Eg_kB8omwe6xmYVd0epr4Q"><img src="https://img.shields.io/badge/Slack-join-4A154B?logo=slack&logoColor=white" alt="Slack"></a>
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<img src="https://img.shields.io/badge/license-Apache--2.0-blue" alt="License">
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</p>
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<p align="center">
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<a href="#what-it-is">它是什么</a> ·
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<a href="#give-claude-eyes">给 Claude 一双「眼睛」</a> ·
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<a href="#how-it-works">工作原理</a> ·
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<a href="#pipelines">流水线</a>
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</p>
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---
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```bash
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pip install pixelrag
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```
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两大核心操作——将页面**渲染(render)**为截图,并在视觉索引中**搜索(search)**:
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```bash
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# Render any page or document to screenshot tiles
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pixelshot https://en.wikipedia.org/wiki/Python --output ./tiles
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# Search a hosted index of 8.28M Wikipedia pages — no setup, runs against the live API
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curl -X POST https://api.pixelrag.ai/search \
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-H "Content-Type: application/json" \
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-d '{"queries": [{"text": "What is the capital of France?"}], "n_docs": 5}'
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```
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> **在线托管端点** — [`https://api.pixelrag.ai`](https://api.pixelrag.ai/status) 提供由 **8.28M** 篇 Wikipedia 页面构成的预构建索引。无需配置,无需 API 密钥。查询甚至可以是图片([视觉搜索(visual search)](https://pixelrag.ai/docs#search)) — 详见 **[API 参考 →](https://pixelrag.ai/docs)**.
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或在浏览器中访问 **[pixelrag.ai](https://pixelrag.ai)**,,或在 Colab 中运行演示 notebook [](https://colab.research.google.com/github/StarTrail-org/PixelRAG/blob/main/demos/quickstart.ipynb) — 它会渲染页面并搜索托管索引,图像内联显示。
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## 它是什么
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PixelRAG 将文档——网页、PDF、图像——渲染为截图,并直接在图像上进行检索。HTML 解析会丢弃的视觉结构——表格、图表、版式、信息图——得以保留,因此阅读模型能够真正回答相关问题。Wikipedia 的 8.28M 篇文章以预构建索引形式提供;流水线本身则是通用型的。
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## 给 Claude 一双「眼睛」
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渲染器还以 Claude Code 插件形式提供——**pixelbrowse** 技能。Claude 不再抓取原始 HTML,而是用 `pixelshot` 对页面截图并*阅读图像*,从而像人一样看到图表、示意图、表格和版式。
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安装即可——无需克隆仓库。安装 `pixelshot` CLI,使其位于你的 `PATH` 上(使用 `uv tool` 或 `pipx`,既可隔离环境,又随时可供 Claude 使用——仅向项目 venv 执行普通 `pip install` 可能会使 `pixelshot` 不在 `PATH` 中):
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```bash
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uv tool install pixelrag # pixelshot on PATH (or: pipx install pixelrag)
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claude plugin marketplace add StarTrail-org/PixelRAG
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claude plugin install pixelbrowse@pixelrag-plugins
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```
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然后直接让 Claude 查看某个页面即可:
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```bash
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claude -p "screenshot https://news.ycombinator.com and summarize the top stories"
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claude -p "screenshot https://arxiv.org/abs/2404.12387 and explain the key findings"
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```
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或在交互式会话中使用斜杠命令:`/screenshot https://example.com`。
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无需 MCP 服务器,也无需后端:该技能只在你本机调用 `pixelshot`(Playwright/CDP)。
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## 工作原理
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<p align="center">
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<img src="docs/assets/pipeline.png" alt="基于文本的 RAG 解析为文本并丢失表格;PixelRAG 渲染为截图分块并保留表格" width="100%">
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</p>
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基于文本的 RAG 将页面解析为文本块并**丢失表格**——阅读器找不到答案。PixelRAG 将页面渲染为**截图分块(screenshot tiles)**,检索到正确的分块后,阅读器可直接从图像中读取数字。
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实现这一点需要两个组件:(1) 将文档渲染为图像,而非解析为文本;(2) 一个在截图数据上经 LoRA 微调的 `Qwen3-VL-Embedding` 模型,将页面图像嵌入到可视内容可检索的空间中。
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## 流水线
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Capture 是独立的 `pixelshot` 命令;流水线的其余部分通过 `pixelrag` 总入口运行——`pixelrag <stage>`。只需安装你需要的阶段:
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| 命令 | 功能 | 安装 |
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| ------------------------------------------ | --------------------------------------------------------------- | ------------------------------- |
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| `pixelshot` | 文档 → 图像分块(Playwright CDP、PDF) | `pip install pixelrag` |
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| `pixelrag chunk` · `embed` · `build-index` | 分块 → 向量 → FAISS 索引 | `pip install 'pixelrag[embed]'` |
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| `pixelrag index` | 编排完整流水线:源 → 摄取 → 嵌入 → 索引 | `pip install 'pixelrag[index]'` |
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| `pixelrag serve` | FAISS 搜索 API(FastAPI,CPU 或 GPU) | `pip install 'pixelrag[serve]'` |
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```
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render ←── index ──→ embed serve (independent) train → serve (HTTP)
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```
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**`train` 是一个独立的 uv 项目**,拥有各自锁定的环境(`torch==2.9.1+cu129`、
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`transformers==4.57.1`、cuDNN 9.20)——请在 `train/` 内部安装,而非在仓库根目录。
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### 搜索预构建索引
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```bash
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pip install 'pixelrag[serve]'
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# Download a pre-built index from Hugging Face. The dataset repo holds four FAISS indexes
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# (base/LoRA Wikipedia pixel, Wikipedia text, news pixel); grab just the base one (~217G) here.
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huggingface-cli download StarTrail-org/pixelrag-faiss-indexes \
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--repo-type dataset --include "search_index_normed_v2/*" --local-dir ./index
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# Serve, then query
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pixelrag serve --index-dir ./index/search_index_normed_v2 --port 30001
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curl -X POST http://localhost:30001/search \
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-H "Content-Type: application/json" \
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-d '{"queries": [{"text": "What is the capital of France?"}], "n_docs": 5}'
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```
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### 用自己的文档构建索引
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适用于 **Linux(CUDA)** 和 **macOS(Apple Silicon / MPS)**——`device: auto` 会自动选择最佳后端。
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```bash
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pip install 'pixelrag[index]'
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# Create pixelrag.yaml
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cat > pixelrag.yaml << 'EOF'
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source:
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type: local
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path: ./my_docs
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embed:
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model: Qwen/Qwen3-VL-Embedding-2B
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device: auto # cuda on Linux, mps on macOS, cpu as fallback
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output: ./my_index
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EOF
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# Build, then serve
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pixelrag index build
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pixelrag serve --index-dir ./my_index --port 30001
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```
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<details>
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<summary><strong>试试看:索引 PDF 并在本地搜索</strong></summary>
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无需 GPU — 可在 macOS(Apple Silicon)或任何装有 Python 3.10+ 的机器上运行。
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```bash
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pip install 'pixelrag[index]'
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# 1. Grab a sample PDF (or use your own)
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curl -L -o paper.pdf https://raw.githubusercontent.com/StarTrail-org/PixelRAG/main/assets/pixelrag-paper.pdf
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# 2. Create config (device: auto picks MPS on Mac, CUDA on Linux)
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cat > pixelrag.yaml << 'EOF'
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source:
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type: local
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path: ./paper.pdf
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embed:
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model: Qwen/Qwen3-VL-Embedding-2B
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device: auto
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output: ./paper_index
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EOF
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# 3. Build the index (~3 min on Apple M-series, ~1 min on GPU)
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pixelrag index build
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# 4. Serve it
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pixelrag serve --index-dir ./paper_index --port 30001
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# 5. Search — should return page 2 (the overview diagram)
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curl -X POST http://localhost:30001/search \
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-H "Content-Type: application/json" \
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-d '{"queries": [{"text": "Overview of PixelRAG and the diagram"}], "n_docs": 1}'
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```
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</details>
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### 以编程方式渲染页面
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```python
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from pixelrag_render import render_url
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# render a single page to tiles — e.g. for an agent to read
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tiles = render_url("https://en.wikipedia.org/wiki/Python", "./tiles")
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```
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同样的渲染能力也可通过 CLI 使用 — `pixelshot` 随 `pip install pixelrag` 一起提供:
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```bash
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# Web page → tiles (headless Chromium via CDP)
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pixelshot https://en.wikipedia.org/wiki/Python -o ./tiles
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# PDF → tiles (requires poppler; install the pdf extra: pip install 'pixelrag[pdf]')
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curl -sL -o paper.pdf https://arxiv.org/pdf/2503.09516
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pixelshot paper.pdf -o ./tiles --dpi 200
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# URLs and local files can be mixed freely
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pixelshot https://github.com/StarTrail-org/PixelRAG paper.pdf -o ./tiles
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```
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> **Windows/macOS 上的 Chrome** — 捆绑的 turbo `headless_shell` 仅在 **linux-x64** 上自动安装。在其他平台上,`pixelshot` 会使用你系统中的 Chrome/Chromium(或 Playwright 的 Chromium),从标准安装位置自动检测。若无法自动找到,可通过 `CHROME_PATH=/path/to/chrome` 指定具体可执行文件路径。每次渲染都在隔离的临时 Chrome 配置文件中运行,因此即使你正在使用 Chrome 也能正常工作。
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### 嵌入工具(独立运行)
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各阶段可独立运行,无需编排器(orchestrator):
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```bash
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pip install 'pixelrag[embed]'
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pixelrag chunk --tiles-dir ./tiles
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pixelrag embed --shard-dir ./tiles --output-dir ./embeddings --gpu-ids 0,1
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pixelrag build-index --embeddings-dir ./embeddings --output-dir ./index
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```
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### 训练
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微调代码位于 `train/` — 这是一个 **独立的 uv 项目**(`wiki-screenshot-training`),拥有自己固定版本的环境。它对 `Qwen/Qwen3-VL-Embedding-2B` 进行 LoRA 微调,用于网页检索;请在 `train/`(`cd train && uv sync`)内运行。完整流程请参阅 [`train/README.md`](train/README.md)。
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使用模型无需自行重新训练 — 训练好的适配器已发布在 [`Chrisyichuan/wiki-screenshot-embedding-lora`](https://huggingface.co/Chrisyichuan/wiki-screenshot-embedding-lora/tree/main/lora_vit/ckpt200).
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我们还发布了完整训练集([`Chrisyichuan/screenshot-training-natural-filtered-v2`](https://huggingface.co/datasets/Chrisyichuan/screenshot-training-natural-filtered-v2)),),方便你自行适配其他骨干模型 — 例如更大的 Qwen,或任意其他嵌入模型。数据整理流水线(LLM 增强的查询生成、过滤、困难负样本挖掘)详见 [`train/docs/synthetic_data_pipeline.md`](train/docs/synthetic_data_pipeline.md)。
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## 引用
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如果你觉得 PixelRAG 有用,请引用我们的论文:
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```bibtex
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@misc{wang2026pixelragwebscreenshotsbeat,
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title={PIXELRAG: Web Screenshots Beat Text for Retrieval-Augmented Generation},
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author={Yichuan Wang and Zhifei Li and Zirui Wang and Paul Teiletche and Lesheng Jin and Matei Zaharia and Joseph E. Gonzalez and Sewon Min},
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year={2026},
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eprint={2606.28344},
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archivePrefix={arXiv},
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primaryClass={cs.IR},
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url={https://arxiv.org/abs/2606.28344},
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}
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```
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## 致谢
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感谢 [Rulin Shao](https://rulinshao.github.io/) 的支持。
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同时感谢 [Claude Code](https://github.com/anthropics/claude-code) 和
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[OpenAI Codex](https://github.com/openai/codex) 为开源贡献者提供积分与方案支持,
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这些支持是我们在参与 [LEANN](https://github.com/StarTrail-org/LEANN). 工作期间获得的。
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本工作由 [Berkeley Sky Computing Lab](https://sky.cs.berkeley.edu/),
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[BAIR](https://bair.berkeley.edu/), 与 [Berkeley NLP Group](https://nlp.cs.berkeley.edu/). 完成。
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## 许可证
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Apache-2.0
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