I Trained a Machine-Learning Model From Scratch in 40 Lines (No scikit-learn)

Everyone imports LinearRegression from scikit-learn and moves on. Today we build it by hand — and you'll see that "training a model" is just a line sliding into a cloud of points. This is Day 1 of MachineLearningFromZero: every core algorithm built from scratch, no black-box library. let m = Math.ra