Speaker Diarization Evaluation Metrics: Beyond DER — A Practical Diagnostic Guide
Evaluating speaker diarization systems requires choosing the right metric for what you actually want to measure. DER is the industry standard, but it cannot diagnose *why* a system fails. To systematically improve a real system, **combine DER with Confusion Matrix, Purity/Coverage, and Boundary Error** for proper root-cause analysis. This article covers calculation formulas, working Python code, and real experimental data — not just textbook definitions.