| Term lookup, beginner glossary, feature/label/model/loss/epoch/overfit concepts | sub-skills/basics-and-math/SKILL.md | Owns glossary, notation, linear/logistic regression, calculus, linear algebra, probability/statistics basics, gradient descent, and loss bridges. |
| Derivations or formulas for MSE, gradient descent, sigmoid/log-loss, matrix dimensions, chain rule | sub-skills/basics-and-math/references/formula-cheatsheet.md | Compact self-contained formula and code-reference map. |
| Decision trees, ID3/C4.5/CART, KNN, random forests, boosting, SVM, regression variants, clustering/RL placeholder status | sub-skills/classical-algorithms/SKILL.md | Owns non-neural algorithm families and their repo-specific caveats. |
| Neural network concepts, weighted inputs, layers, activation/loss/optimizers, forward/backpropagation, regularization, CNN/RNN/GAN/VAE/autoencoder/MLP examples | sub-skills/neural-networks/SKILL.md | Owns neural-network conceptual and architecture workflows. |
| Dataset, library, paper, course, blog, application, or learning-resource selection | references/resources-catalog.md | Distills the repository's large resource catalogs into usable categories and representative picks. |
| Site map, source-content ownership, or what each original content family represented | references/site-map.md | Provides a self-contained map of the docs/code/notebook evidence without requiring the original files. |
| Contributing, RST style, Sphinx build setup, docs preview, or glossary entry authoring | references/site-maintenance.md and references/troubleshooting.md | Captures contribution style, Sphinx dependencies, build caveats, and legacy warning patterns. |
| Staleness or refresh checks | references/repo-provenance.md | Records the source commit, branch, dirty state, and evidence baseline. |