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Commits on Jul 1, 2026

• Merge roadmap role-pages mobile fix: interactive-row tag full-width + nav no-wrap (roadmap-role.css v10, all 6 role pages)

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• Roadmap role pages mobile: interactive-row tag full-width + drops below title (.ilsn/.ilhy); nav no-wrap + 320px tightening (roadmap-role.css v10)

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• Merge: PCA interactive lesson 1 for DS Unsupervised + site-wide OG social-preview images

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• OG images: commit generated social-preview cards for interactive lessons + quizzes (fixes site-wide /screenshots/og/*.png 404s; build.py skips regen on fresh committed pages)

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• DS Unsupervised: add PCA as interactive lesson 1 (Principal-Component-Analysis), repoint course cross-refs; §9 now a full 8-lesson interactive course + quiz. Existing PCA-in-R tutorial preserved.

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• Re-trigger CF Pages build (deploy of 4049d0c78 stalled ~30min; content verified correct on origin/master)

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• Merge roadmap mobile fix: interactive-lesson title full-width, pill on its own line; nav no-wrap + 320px overflow fix

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• Merge DS batch 2: sections 6-12 (45 interactive lessons + 7 end-of-section quizzes + Unsupervised Learning course landing + 10 widgets + catalog/manifest sync)

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• DS sections 6-12: add 7 end-of-section quizzes + Unsupervised Learning course landing; sync catalog + grading manifest

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• Publish lesson: Unsupervised Learning Lesson 7: t-SNE and UMAP

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• Publish lesson: Model Evaluation Lesson 6: Comparing Models Statistically

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• Publish lesson: Machine Learning in Production Lesson 6: An ML system design checklist

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• Publish lesson: Machine Learning in Production Lesson 5: Monitoring and drift

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• Publish lesson: Machine Learning in Production Lesson 4: Batch vs real-time inference

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• Publish lesson: Machine Learning in Production Lesson 3: Serving a model with plumber

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• Publish lesson: Versioning models with vetiver and pins

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• Publish lesson: Reproducible Pipelines with targets (new course + landing)

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• Publish lesson: Model Cards and Documenting a Model

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• Publish lesson: Fairness Basics

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• Publish lesson: Interpretability Lesson 4: Partial Dependence, ICE, and ALE

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• Publish lesson: SHAP Values

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• Roadmap mobile: interactive-lesson title full-width, pill on its own line; nav no-wrap + 320px count-overflow fix

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• Publish lesson: Interpretability Lesson 2: Permutation and Drop-Column Importance

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• Publish lesson: Interpretability Lesson 1: Global vs Local Explanations (new course + landing)

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• Publish lesson: Causal Inference Lesson 5: When You Cannot Randomize

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• Publish lesson: Reading an Experiment

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• Publish lesson: Causal Inference Lesson 3: A/B Testing and Experiment Design

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• Publish lesson: Causal Inference Lesson 2: Causal Diagrams with DAGs

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• Publish lesson: Causal Inference L1 - Correlation, Causation and Potential Outcomes (+ course landing)

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• Publish lesson: Unsupervised Learning Lesson 8: Association Rules and Market Basket

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• Publish lesson: Unsupervised Learning Lesson 6: Cluster Validation and Stability

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• Publish lesson: Gaussian Mixture Models

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• Publish lesson: Hierarchical and Density Clustering

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• Publish lesson: Unsupervised Learning Lesson 3: k-Means and Choosing k

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• Publish lesson: Unsupervised Learning Lesson 2: Factor Analysis

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