The Teachable Machine from Støj, Use All Five, and Google is a fun experiment that lets you “teach” your computer. Your webcam is used as an input device, and using deeplearn.js, you can make three classifications that change the output. Use different hand gestures, faces, or movements to signal differences, and you can see probabilities change in real-time.
It’s hard to believe this stuff runs so smoothly in the browser now. I remember learning this back in college. The training and usage in some heavy software package was laborious.