Archives

2026  27

September  13

Trajectory ML 01: From Observations to Hidden State

September 27, 2026 · 7 min · rick

Trajectory ML 02: PCA as the First Latent Space

September 27, 2026 · 6 min · rick

Trajectory ML 03: Autoencoders, VAEs, and Useful State

September 27, 2026 · 6 min · rick

Trajectory ML 04: Neighborhoods, Manifolds, and the Swiss Roll

September 27, 2026 · 5 min · rick

Trajectory ML 09: Learn where a state moves next

September 27, 2026 · 6 min · rick

Trajectory ML 10: Move a population with optimal transport

September 27, 2026 · 6 min · rick

Trajectory ML 11: Continuous dynamics and flow matching

September 27, 2026 · 6 min · rick

Trajectory ML 12: Outcomes, survival, and causal questions

September 27, 2026 · 2 min · rick

Trajectory ML 5: Diffusion Maps and Spectral Geometry

September 27, 2026 · 6 min · rick

Trajectory ML 6: Clusters, Communities, and Useful States

September 27, 2026 · 6 min · rick

Trajectory ML 7: From Points to Paths and Branches

September 27, 2026 · 7 min · rick

Trajectory ML 8: Markov Models, HMMs, and State Space Models

September 27, 2026 · 6 min · rick

Trajectory ML: A Twelve-Lesson Course and Shared Lab

September 27, 2026 · 7 min · rick

July  3

Artificial Life and General System Theory

July 12, 2026 · 13 min · rick

The Curse of Talent, the Blessing of Temperament

July 11, 2026 · 11 min · rick

Personal Information You Can Extract From a Genome

July 5, 2026 · 4 min · rick

June  1

A ReLU Network Is One Giant Piecewise-Affine Function

June 28, 2026 · 8 min · rick

February  2

Setting Up Korean IME (kime) on AWS DCV

February 21, 2026 · 3 min · rick

Shooting Dead Enemies: Why Academia Keeps Fighting Zombie Debates

February 1, 2026 · 8 min · rick

January  8

My Father’s Technology Timeline

January 25, 2026 · 4 min · rick

runpod-log: A CLI Log Viewer for RunPod

January 25, 2026 · 1 min · rick

Do LLMs Have Thinking Styles? REI-40 Experiment on 5 Frontier Models

January 24, 2026 · 5 min · rick

psyctl: An LLM Personality Steering Tool

January 24, 2026 · 1 min · rick

Self-Actualization Is No Different from a Pufferfish’s Sand Circle

January 24, 2026 · 7 min · rick

Two Minds in One Brain: Why We Act Irrationally Even When We Know Better

January 24, 2026 · 8 min · rick

Uri Alon’s Systems Biology: The Free Lectures

January 11, 2026 · 1 min · rick

The Model Efficiency series has moved to the company blog

January 4, 2026 · 1 min · rick

2025  12

November  1

The Idea That Lost and Came Back: Skinner, Chomsky, and the Talking Machines

November 15, 2025 · 6 min · rick

September  1

Sentence Reranking Using LLM Attention Maps

September 7, 2025 · 5 min · rick

August  1

Transformer Circuits 7: The Related-Work Landscape

August 9, 2025 · 3 min · rick

July  2

Transformer Circuits 6: Where Does This Leave Us?

July 26, 2025 · 3 min · rick

Transformer Circuits 5: Two-Layer Models and Induction Heads

July 12, 2025 · 7 min · rick

June  2

Transformer Circuits 4: One-Layer Models and Skip-Trigrams

June 28, 2025 · 7 min · rick

Transformer Circuits 3: Zero-Layer Transformers

June 14, 2025 · 3 min · rick

May  3

Transformer Circuits 2: The Transformer, Redrawn

May 31, 2025 · 9 min · rick

Transformer Circuits 1: Summary of Results

May 17, 2025 · 3 min · rick

Mechanistic Interpretability: Free Materials to Start

May 10, 2025 · 1 min · rick

February  1

Steering GPT-2’s Emotions with Sparse Autoencoders

February 16, 2025 · 6 min · rick

January  1

MacKay’s Information Theory: The Free Book and the Lectures

January 4, 2025 · 2 min · rick

2023  1

December  1

K-means, GMM, EM: Three Nested Russian Dolls of Clustering

December 10, 2023 · 7 min · rick

2021  7

June  1

Reinforcement Learning Lecture 10: RL in Games

June 19, 2021 · 16 min · rick

May  1

Reinforcement Learning Lecture 9: Exploration and Exploitation

May 15, 2021 · 19 min · rick

April  1

Reinforcement Learning Lecture 8: Integrating Learning and Planning

April 17, 2021 · 5 min · rick

March  1

Reinforcement Learning Lecture 7: Policy Gradient

March 13, 2021 · 6 min · rick

February  1

Reinforcement Learning Lecture 6: Value Function Approximation

February 13, 2021 · 13 min · rick

January  2

Reinforcement Learning Lecture 5: Model-Free Control

January 16, 2021 · 14 min · rick

Information Geometry: How AI Learns Most Efficiently

January 9, 2021 · 4 min · rick

2020  5

December  1

Reinforcement Learning Lecture 4: Model-Free Prediction

December 12, 2020 · 6 min · rick

November  1

Reinforcement Learning Lecture 3: Dynamic Programming

November 14, 2020 · 6 min · rick

October  1

Reinforcement Learning Lecture 2: Markov Decision Processes

October 17, 2020 · 6 min · rick

September  2

Reinforcement Learning, Lecture 1: The RL Problem

September 19, 2020 · 12 min · rick

Reinforcement Learning: Sutton & Barto and David Silver, Free

September 5, 2020 · 2 min · rick