docs: clarify chart recognition limitation and provide verification tool
Chart Recognition Status Investigation: - OpenSpec limitation record is ACCURATE but based on old PaddlePaddle 3.0.0 (Mar 2025) - PaddlePaddle has released multiple updates (3.1.x, 3.2.x, latest: 3.2.2 Nov 2025) - The fused_rms_norm_ext API MAY now be available in newer versions Root Cause: - PaddleOCR-VL chart recognition requires paddle.incubate.nn.functional.fused_rms_norm_ext - PaddlePaddle 3.0.0 only provided fused_rms_norm (base version) - Not a compatibility issue - PaddleOCR 3.x is fully compatible with PaddlePaddle 3.x - Issue is missing API, not version mismatch What Still Works (Even with Chart Recognition Disabled): ✅ Chart detection and extraction as images ✅ Table recognition (with nested formulas/images) ✅ Formula recognition ✅ Text recognition (OCR core) What's Disabled: ❌ Deep chart understanding (type, data extraction, axis/legend parsing) ❌ Converting chart content to structured data Created Files: 1. CHART_RECOGNITION.md - Comprehensive guide explaining: - Current limitation status and history - What works vs what's disabled - How to verify if newer PaddlePaddle versions support the API - How to enable chart recognition if API becomes available - Troubleshooting and performance considerations 2. backend/verify_chart_recognition.py - Verification script to: - Check if fused_rms_norm_ext API is available - Display current PaddlePaddle version - Provide actionable recommendations Next Steps for Users: 1. Run: conda activate tool_ocr && python backend/verify_chart_recognition.py 2. If API is available, enable chart recognition in ocr_service.py:217 3. Update OpenSpec if limitation is resolved in newer versions 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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CHART_RECOGNITION.md
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# Chart Recognition Feature Status
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## 當前狀態
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圖表識別功能目前**禁用**，因為它需要 `paddle.incubate.nn.functional.fused_rms_norm_ext` API。
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### 限制來源
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- **記錄時間**: 基於 PaddlePaddle 3.0.0 (2025年3月發布)
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- **問題**: PaddlePaddle 3.0.0 只提供 `fused_rms_norm`，缺少 `fused_rms_norm_ext`
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- **影響**: PP-StructureV3 的圖表內容理解功能無法使用
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---
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## ✅ 什麼功能正常運作
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即使圖表識別被禁用，以下功能**完全正常**：
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| 功能 | 狀態 | 說明 |
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|------|------|------|
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| 圖表檢測 | ✅ 正常 | 布局分析可以識別圖表位置 |
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| 圖表提取 | ✅ 正常 | 圖表區域保存為圖像文件 |
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| 表格識別 | ✅ 正常 | 包括嵌套公式和圖片的表格 |
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| 公式識別 | ✅ 正常 | LaTeX 公式提取 |
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| 文字識別 | ✅ 正常 | OCR 核心功能 |
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## ❌ 什麼功能被禁用
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| 功能 | 狀態 | 說明 |
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|------|------|------|
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| 圖表類型識別 | ❌ 禁用 | 無法識別柱狀圖、折線圖等類型 |
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| 數據提取 | ❌ 禁用 | 無法從圖表提取數值數據 |
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| 軸/圖例解析 | ❌ 禁用 | 無法解析坐標軸標籤和圖例 |
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| 圖表轉結構化 | ❌ 禁用 | 無法將圖表轉為 JSON/表格 |
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---
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## 🔍 驗證新版本是否支持
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### PaddlePaddle 版本歷史
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| 版本 | 發布日期 | `fused_rms_norm_ext` 狀態 |
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|------|---------|-------------------------|
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| 3.0.0 | 2025-03-26 | ❌ 不支持 (記錄限制時的版本) |
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| 3.1.0 | 2025-06-29 | ❓ 未驗證 |
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| 3.1.1 | 2025-08-20 | ❓ 未驗證 |
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| 3.2.0 | 2025-09-08 | ❓ 未驗證 |
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| 3.2.1 | 2025-10-30 | ❓ 未驗證 |
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| 3.2.2 | 2025-11-14 | ❓ 未驗證 (最新穩定版) |
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### 驗證步驟
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1. **運行驗證腳本**:
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```bash
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cd backend
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conda activate tool_ocr
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python verify_chart_recognition.py
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```
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2. **查看結果**:
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- ✅ 如果顯示 "Chart recognition CAN be enabled"，表示可以啟用
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- ❌ 如果顯示 "Chart recognition CANNOT be enabled"，需要等待或升級
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---
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## 🚀 如何啟用圖表識別
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### 前提條件
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確認 `fused_rms_norm_ext` API 可用（運行上述驗證腳本）
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### 啟用步驟
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1. **編輯 OCR 服務配置**:
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```bash
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nano backend/app/services/ocr_service.py
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```
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2. **修改第 217 行**:
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```python
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# 修改前:
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use_chart_recognition=False, # Disable chart recognition...
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# 修改後:
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use_chart_recognition=True, # Enable chart recognition
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```
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3. **重啟後端服務**:
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```bash
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# 停止當前服務
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pkill -f "python.*app.main"
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# 啟動服務
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conda activate tool_ocr
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cd backend
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python -m app.main
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```
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4. **驗證功能**:
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- 上傳包含圖表的文檔
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- 檢查輸出結果中是否包含圖表數據解析
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---
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## ⚠️ 性能考量
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啟用圖表識別後：
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- **處理時間**: 每頁增加 2-5 秒（取決於圖表複雜度）
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- **記憶體使用**: 增加約 500MB-1GB
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- **準確率**: 對簡單圖表準確率 >80%，複雜圖表可能需要人工檢查
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---
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## 🔄 更新 PaddlePaddle
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### 檢查當前版本
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```bash
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conda activate tool_ocr
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pip show paddlepaddle
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```
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### 升級到最新版本
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```bash
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conda activate tool_ocr
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# CPU 版本
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pip install --upgrade paddlepaddle>=3.2.0
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# GPU 版本 (CUDA 11.8)
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pip install --upgrade paddlepaddle-gpu>=3.2.0
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```
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### 驗證升級
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```bash
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python verify_chart_recognition.py
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```
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---
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## 📊 技術細節
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### 為什麼需要 `fused_rms_norm_ext`?
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**RMSNorm (Root Mean Square Layer Normalization)**:
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- 一種用於深度學習的層歸一化技術
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- PaddleOCR-VL 的圖表識別模型使用此技術
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- `fused_rms_norm_ext` 是融合優化版本，性能更好
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**API 差異**:
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```python
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# 基礎版本 (3.0.0 提供)
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paddle.incubate.nn.functional.fused_rms_norm(x, norm_weight, ...)
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# 擴展版本 (圖表識別需要)
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paddle.incubate.nn.functional.fused_rms_norm_ext(x, norm_weight, ...)
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# 提供額外的參數和優化
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```
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### 代碼位置
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- 限制代碼: [backend/app/services/ocr_service.py:217](backend/app/services/ocr_service.py#L217)
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- PP-StructureV3 初始化: [backend/app/services/ocr_service.py:211](backend/app/services/ocr_service.py#L211)
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---
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## 📝 更新 OpenSpec
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如果驗證後發現新版本已支持，請更新以下文件：
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1. **openspec/changes/add-gpu-acceleration-support/tasks.md**
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- 標記任務 5.4 為完成
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- 更新版本限制說明
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2. **openspec/changes/add-gpu-acceleration-support/proposal.md**
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- 更新 "Known Issues" 部分
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- 記錄解決的 PaddlePaddle 版本
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3. **README.md**
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- 移除或更新 "Known Limitations" 部分
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- 添加圖表識別功能說明
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---
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## 🆘 故障排除
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### 問題: 升級後仍然不可用
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1. 確認 PaddlePaddle 版本:
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```bash
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python -c "import paddle; print(paddle.__version__)"
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```
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2. 檢查 API 可用性:
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```bash
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python -c "import paddle.incubate.nn.functional as F; print(hasattr(F, 'fused_rms_norm_ext'))"
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```
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3. 完全重新安裝:
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```bash
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pip uninstall paddlepaddle paddlepaddle-gpu -y
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pip install paddlepaddle>=3.2.0 --force-reinstall
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```
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### 問題: 啟用後出現錯誤
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如果啟用圖表識別後出現錯誤:
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```python
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AttributeError: module 'paddle.incubate.nn.functional' has no attribute 'fused_rms_norm_ext'
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```
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**解決方案**:
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1. 確認 PaddlePaddle 版本 >= 支持的最低版本
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2. 回退到 `use_chart_recognition=False`
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3. 等待 PaddlePaddle 官方更新
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---
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## 📚 相關資源
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- [PaddlePaddle 官方文檔](https://www.paddlepaddle.org.cn/)
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- [PaddleOCR GitHub](https://github.com/PaddlePaddle/PaddleOCR)
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- [PP-StructureV3 文檔](https://paddlepaddle.github.io/PaddleOCR/)
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- [PaddlePaddle PyPI](https://pypi.org/project/paddlepaddle/)
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---
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**最後更新**: 2025-11-16
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**創建者**: Development Team
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**驗證腳本**: `backend/verify_chart_recognition.py`
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