Author name: Obinna Iheanachor

Churn Without Fragmentation: How a Party-Label Bug Reversed My Headline Finding

Obinna Iheanachor / May 1, 2026

A data quality case study from English local elections on categorical normalisation, metric validation, and why raw labels should never define analytical groups. The post Churn Without Fragmentation: How a Party-Label Bug Reversed My Headline Finding a…

ContentCategory.ENGINEERING

From 4 Weeks to 45 Minutes: Designing a Document Extraction System for 4,700+ PDFs

Obinna Iheanachor / April 7, 2026

How a hybrid PyMuPDF + GPT-4 Vision pipeline replaced £8,000 in manual engineering effort, and why the latest models weren’t the answer The post From 4 Weeks to 45 Minutes: Designing a Document Extraction System for 4,700+ PDFs appeared first on Toward…