Episode 88 — Explainability: Global vs Local and Interpretable vs Post-Hoc
This episode teaches explainability as a spectrum of needs and methods, because DataX scenarios often include constraints like regulatory review, operational trust, or stakeholder understanding that require you to choose between inherently interpretable models and post-hoc explanations. You will define global explainability as understanding the overall model behavior across the population and local explainability as understanding why a specific prediction was made for a specific case, then connect each to different audiences and decisions. Interpretable models will be described as those whose structure is understandable by design, such as linear models with stable coefficients or shallow trees, while post-hoc methods will be described as add-on explanations applied after training to approximate the model’s reasoning. You will practice scenario cues like “must justify individual decisions,” “audit required,” “operations need rules,” “model is complex,” or “stakeholders need drivers,” and select whether global or local explanation is required and whether interpretability should be built-in or added post-hoc. Best practices include ensuring explanations are faithful enough for the decision, validating explanation stability under drift and across segments, and communicating that explanations are not causal proofs but descriptions of model behavior under the learned correlations. Troubleshooting considerations include spurious explanations caused by correlated features, explanation instability when small input changes flip importance, and governance risks when explanations are used as compliance artifacts without validation. Real-world examples include credit-like decisioning, fraud escalations, clinical triage, and operational alerting, where different explainability levels are required for trust and actionability. By the end, you will be able to choose exam answers that match explainability type to requirement, justify why an interpretable model may be preferred even at slight performance cost, and describe how to deploy explanations responsibly in real systems. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your educational path. Also, if you want to stay up to date with the latest news, visit DailyCyber.News for a newsletter you can use, and a daily podcast you can commute with.
