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Technical Write-ups

Long-form walkthroughs of papers, algorithms, and core ideas in deep learning.

Watercolor illustration for the Dr.GRPO post
Technical Write-up

You Could Have Invented Dr.GRPO Yourself

A ground-up walkthrough of modern RL for LLMs: from REINFORCE to Dr.GRPO, showing how each algorithm was forced by exactly one broken thing in the previous one.

Reinforcement Learning PPO GRPO LLMs
Watercolor illustration for the entropy post
Technical Write-up

You Could Have Invented Entropy Yourself

A ground-up derivation that runs from a number-guessing game to the loss function of a language model: halving, bits, entropy, cross-entropy, perplexity, and KL divergence, each step the obvious next move from the last.

Information Theory Entropy Cross-Entropy KL Divergence LLMs
A photo of cells stylized in the manner of Picasso.
Technical Write-up

A Deep Dive into Neural Style Transfer

An implementation and explanation of the seminal 2015 paper by Gatys et al., breaking down the concepts of content and style loss.

Style Transfer Computer Vision CNNs