Artificial Intelligence / Unit 8 AI 0408 short lesson, about 20 seconds
Grading Day
Captions available
The idea
A learned predictor is graded on examples it has never seen — the training score measures memory, and only the test score measures what was learned about the world.
In practice
Accuracy is the share of predictions that are right; the share that matters is the drawer's.
Where people slip
Perfect training scores are cheap — a learner can always get them by memorizing.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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