Andrew R. Louis
I fall down rabbit holes and write about what I find at the bottom. Systems, algorithms, machine learning — built from first principles, with interactive visualizations for the parts where prose gives up.
the perceptron: no thoughts, just dot products
It’s just y = mx + b with a God complex.
2026-01-11·perceptron, machine-learning, linear-algebra, neural-networks
when the linked lists go dancing
stationary data, moving relationships.
2026-01-23·data-structures, memory, performance, systems-programming
the shape of stuck
stuckness has geometry. the shape suggests what to try next.
2026-01-23·algorithms, problem-solving, descartes, kahneman