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

inference

Using an already-trained, fixed model to make a prediction on new data -- as opposed to training, which is still adjusting the weights.

Examples

A spam filter checking one new email is running inference; fitting its weights on last year's mail was training.