Three targeted fixes for layout processing issues:
1. formula_number type mapping (layout_detector.py)
- Changed formula_number region type from "formula" to "text"
- Ensures Text Recognition prompt, preventing $$-wrapped output
- Prevents malformed \tag{$$...\n$$} in merged formulas
2. Reading order (ocr_service.py)
- Sort layout regions by (y1, x1) after detection
- Ensures top-to-bottom, left-to-right processing order
- Fixes paragraph ordering issues in output
3. Formula number cleaning (glm_postprocess.py)
- clean_formula_number() now strips $$, $, \[...\] delimiters
- Handles edge case where vLLM still returns math-mode wrapped content
- Prevents delimiter leakage into \tag{} placeholders
Also adds logging:
- Warning when empty formula content is skipped
- Warning when region crop is too small (< 10×10 px)
- Warning when vLLM parallel call fails
- Warning when format conversion fails
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
