👋 Welcome

Hi, I’m Razvan. I use this blog to document what I’m learning. Writing things down helps me understand them better, and it also reflects an idea I value deeply:

All rules for study are summed up in this one:
learn only in order to create.
~ Friedrich Schelling (Wikiquote)

I try to learn with that in mind, and this blog is part of that process.

Logistic Regression

Binary logistic regression as a Bernoulli model: setup, cross-entropy objective, and gradient-based fitting.

Linear Regression

Ordinary least squares as a linear mean model: setup, normal equations, and gradient updates.