#339

Описание: Last time our leaf model scored ninety-nine and a half percent on validation. But a farmer's phone won't produce our generator's pictures: different leaves, different light, a different background. In Video 339 of AI from Zero to Today, the last video of Module 8, we ask: will it work on a new leaf?

In this video:
• The test set, touched once: 99% and a look at the four mistakes
• Grad-CAM on leaves: 67% of the heat on a leaf covering 27% of the image
• A new leaf style drops accuracy to 38.5%, and swapping backgrounds shows why
• Background-replacement augmentation: 98% on held-back new leaves
• A small web app on the standard library, tested in a real browser
• Softmax calls a blank gray picture healthy at 92%, so the app checks for a leaf first

⏱ Chapters
0:00 Introduction
0:16 Opening question
0:40 Recap
1:04 1. The Test
2:39 2. A New Leaf
5:53 3. The App
6:53 Twist question
8:01 Summary board
8:36 Goal check
9:19 Try it yourself
9:38 Next video

📚 About this series
AI from Zero to Today builds the whole subject of AI from nothing: the ideas, the mathematics and the code, until you can build real AI yourself. One idea per video, explained completely, in simple English.

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