Trajectory ML 7: From Points to Paths and Branches
Build a minimal tree baseline, understand principal curves and PAGA, and identify what pseudotime can and cannot measure.
Posts
Trajectory ML 8: Markov Models, HMMs, and State Space Models
Use observed sequence order to estimate transitions, infer hidden states, and separate filtering from smoothing.
Trajectory ML: A Twelve-Lesson Course and Shared Lab
Recovering hidden states and trajectories from observations, from PCA to Flow Matching, survival analysis and causality, with one synthetic dataset.
Artificial Life and General System Theory
As an undergrad I opened ‘General System Theory’ expecting the ultimate design principle, and found biology instead. Half a century ago Bertalanffy said life is not matter but organization: Lenia proves it on a computer.
The Curse of Talent, the Blessing of Temperament
Is talent a blessing or a trap? An analysis of how talent conditioned by short reward cycles sabotages long-term effort, and a look beneath what we call grit, at the two engines underneath: taste and lack.
Personal Information You Can Extract From a Genome
The Y chromosome and the surname are both inherited down the paternal line. That single fact was enough to recover real identities from ‘anonymous’ genomes, as shown in this 2013 Science paper.
A ReLU Network Is One Giant Piecewise-Affine Function
A network with ReLU activations secretly carves input space into polytope pieces and, on each piece, collapses into exactly one affine map. This post builds that view up from a single neuron to interactive demos.
Setting Up Korean IME (kime) on AWS DCV
How I fixed the issue where kime Korean IME only types one character before reverting to English on AWS DCV remote desktop.
Shooting Dead Enemies: Why Academia Keeps Fighting Zombie Debates
Why we keep resurrecting settled debates, and the irony of this very essay doing the same
My Father's Technology Timeline
In 1990, my father bought a computer for his five-year-old son.