Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

weighted sum

Each feature multiplied by its own weight, the products added, and a bias added last -- $z = w_1 x_1 + w_2 x_2 + b$ .

Examples

$0.5 \cdot 2 + 0.2 \cdot 3 + 1 = 2.6$ .