# Tasks: Upgrade PP-StructureV3 Models

## 1. Backend Configuration Changes

- [x] 1.1 Update `backend/app/core/config.py` - Enable preprocessing flags
  - Set `use_doc_orientation_classify` default to True
  - Set `use_doc_unwarping` default to True
  - Set `use_textline_orientation` default to True
  - Add `table_structure_model_name` configuration
  - Add `formula_recognition_model_name` configuration

- [x] 1.2 Update `backend/app/services/ocr_service.py` - Model mapping changes
  - Update `LAYOUT_MODEL_MAPPING`:
    - Change `"chinese"` from `"PP-DocLayout-S"` to `"PP-DocLayout_plus-L"`
    - Keep `"default"` as PubLayNet
    - Keep `"cdla"` as is
  - Update `_ensure_structure_engine()`:
    - Pass preprocessing flags to PPStructureV3
    - Configure SLANeXt models for table recognition
    - Configure PP-FormulaNet_plus-L for formula recognition

- [x] 1.3 Update PPStructureV3 initialization kwargs
  - Add `table_structure_model_name="SLANeXt_wired"` (or configure dual model)
  - Add `formula_recognition_model_name="PP-FormulaNet_plus-L"`
  - Verify preprocessing flags are passed correctly

## 2. Schema Updates

- [x] 2.1 Update `backend/app/schemas/task.py` - LayoutModelEnum
  - Rename or update `CHINESE` description to reflect PP-DocLayout_plus-L
  - Update docstrings to reflect new model capabilities

## 3. Frontend Updates

- [x] 3.1 Update `frontend/src/components/LayoutModelSelector.tsx`
  - Update Chinese option description to mention PP-DocLayout_plus-L
  - Update accuracy information displayed to users

- [x] 3.2 Update `frontend/src/i18n/locales/zh-TW.json`
  - Update `layoutModel.chinese.description` to reflect new model
  - Update any accuracy percentages in descriptions

## 4. Testing

- [x] 4.1 Create unit tests for new model configuration
  - Test preprocessing flags are correctly passed
  - Test model mapping resolves correctly
  - Test engine initialization with new models

- [ ] 4.2 Integration testing with real documents
  - Test rotated document handling (preprocessing)
  - Test complex Chinese document layout detection
  - Test table structure recognition accuracy
  - Test formula recognition with Chinese formulas

- [x] 4.3 Update existing tests
  - Update `backend/tests/services/test_layout_model.py` for new mapping
  - Update `backend/tests/api/test_layout_model_api.py` if needed

## 5. Documentation

- [x] 5.1 Create model cleanup documentation
  - Document `~/.paddlex/official_models/` cache location
  - List models that can be safely deleted after upgrade
  - Provide cleanup script/commands
  - See: [MODEL_CLEANUP.md](./MODEL_CLEANUP.md)

- [x] 5.2 Update API documentation
  - Document preprocessing feature behavior
  - Update layout model descriptions

## 6. Verification & Deployment

- [ ] 6.1 Verify new models download correctly on first use
- [ ] 6.2 Measure memory/GPU usage with new models
- [ ] 6.3 Compare processing speed before/after upgrade
- [ ] 6.4 Verify existing functionality not broken