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Artwork for AI by Hand ✍️

AI by Hand ✍️

Prof. Tom Yeh, Luke Yeh

Math, Algorithms, Architectures, by hand

Platform
Substack
PricingFreemiumPublishesDaily
Issues217SubscribersRead byhand.ai

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Latest Issues

Recent posts by this newsletter. Browse the email archive.

PPO → DPO → GRPO→ Rubrics

In last week’s AI by Hand ✍️ seminar, I talked about reinforcement learning from first principles. I started all the way back from pre-training and inference, before climbing forward through the major evolution stages of the modern RL stack...

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Entropy

Essential AI Math Excel Blueprints

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GAN ~ draw by hand

It probably would take NanoBanana 2 less than five seconds to generate an impressive drawing of a Generative Adversarial Network (GAN). But it took Luke, my 15 year-old, almost 3 hours (10800 seconds) to draw this. In computer science term,...

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PPO Clipped Policy Loss Algorithm

I’m piloting a new series — Frontier AI Algorithm Blueprints — where I rebuild, from first principles in Python and Excel, the core algorithms that power today’s frontier AI models.

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Authors

The writers behind this newsletter.

  • Prof. Tom Yeh

    Associate Professor of Computer Science

  • Luke Yeh

    Sophomore at PALY AI expert

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