Gradient descent on a quadratic you can solve exactly
Solve gradient descent on a scalar quadratic exactly, identify the stable learning-rate interval, and distinguish convergence from oscillation.
Foundation
The journal / Ideas in progress
Engineering & everyday learningNotes from
the work.
Software, systems, and the things I’m learning along the way. From first principles to AI in production.
Find something to readAll notes 3
A little theory. A lot of practice.
Check a gradient with finite differences before trusting training
Derive central-difference error, expose floating-point cancellation and a hidden gradient bug, and test the limits of directional checks.
Foundation
Lighthouse 100 and agent-ready: a Da Nang flower shop
How a Da Nang flower shop site reached Lighthouse 100 on desktop and mobile and a 100/100 agent-ready score: Cloudflare, images, SEO, GEO and AEO.
Intermediate