Notes on computational neuroscience, NLP, and applied ML.https://hafst1.is/https://hafst1.is/2016/04/08/asynchronous-percolation/https://hafst1.is/2016/04/08/asynchronous-percolation/Bootstrap percolation without synchronous rounds — when edge delays are random the activity percolates much faster, in constant expected time.Fri, 08 Apr 2016 00:00:00 GMThttps://hafst1.is/2016/03/27/bootstrap-percolation/https://hafst1.is/2016/03/27/bootstrap-percolation/A graph-based process that models the spread of activity in a network, with an interactive vis.js simulation on the Erdős–Rényi random graph.Sun, 27 Mar 2016 00:00:00 GMThttps://hafst1.is/2016/04/25/percolation-with-inhibition/https://hafst1.is/2016/04/25/percolation-with-inhibition/Adding inhibitory vertices to bootstrap percolation. An interactive simulation with green and red nodes shows how competing positive and negative messages shape activity in the graph.Mon, 25 Apr 2016 00:00:00 GMThttps://hafst1.is/2016/04/29/percolation-with-inhibition-part2/https://hafst1.is/2016/04/29/percolation-with-inhibition-part2/Modelling the percolation-with-inhibition process as a Markov chain on the potential of a single vertex, with an interactive D3 visualisation of the chain, a histogram of stopping times, and a running estimate of the probability of activation.Fri, 29 Apr 2016 00:00:00 GMThttps://hafst1.is/2016/05/15/lif-neuron/https://hafst1.is/2016/05/15/lif-neuron/A simple, widely-used membrane-voltage model of biological neurons. We motivate it from Hodgkin and Huxley's experiments, write down the differential equations, and explore the dynamics with an interactive D3 simulation.Sun, 15 May 2016 00:00:00 GMThttps://hafst1.is/2026/05/14/dnd-comics/https://hafst1.is/2026/05/14/dnd-comics/A small pipeline that records a session on a Zoom H1 Essential, transcribes the Icelandic audio with ElevenLabs, and renders each session as a graphic novel with gpt-image-2 and a set of reference images that keep the cast looking consistent across pages.Thu, 14 May 2026 00:00:00 GMThttps://hafst1.is/2026/07/05/percolation-screensaver/https://hafst1.is/2026/07/05/percolation-screensaver/The bootstrap percolation animation from the front page of this site, rebuilt as a native macOS screensaver with six color themes and a proper configuration sheet.Sun, 05 Jul 2026 00:00:00 GMT