Ch 5 · Classification — Predicting Categories · Machine Learning & AI

Topic 5 of 13 in Machine Learning & AI — Foundations — 2 lessons.

From Numbers to Yes/No

Regression predicts a number; classification predicts a category. To turn a number into a probability between 0 and 1, we squash it through the sigmoid function — the heart of logistic regression.

A Tiny Classifier

Combine a weight, a bias, and the sigmoid into a classifier: above 0.5 → class 1, below → class 0.

All topics in Machine Learning & AI Beginner

1. What Is Machine Learning?
2. Data — Features, Labels & Splitting
3. Linear Regression — Fitting a Line
4. How Models Learn — Gradient Descent
5. Classification — Predicting Categories
6. Decision Trees
7. Evaluating a Model Honestly
8. Overfitting & the Bias-Variance Tradeoff
9. The ML Workflow
10. Mini-Project — A Spam Classifier
11. Clustering — Finding Groups Without Labels
12. Your First Real scikit-learn Model
13. Words as Numbers — A Taste of NLP