Writing

Contextual Bandits as Supervised Learning

Contextual Bandits as Supervised Learning

DJ Rich
Posted: June 28, 2024

This posts explains contextual bandits as a generalization of supervised learning.
How to Understand Recommender Systems

How to Understand Recommender Systems

DJ Rich
Posted: June 18, 2024

The wide literature on recommender systems obscures their commonalities. This post highlights what makes them similar, offering a simplifying perspective.
Evaluating Recommender Systems

Evaluating Recommender Systems

DJ Rich
Posted: May 14, 2024

A few things worth considering when evaluating a recommender system.
Randomized Numerical Linear Algebra

Randomized Numerical Linear Algebra

DJ Rich
Posted: April 08, 2024

Some follow up questions from my video on Randomized Numerical Linear Algebra
A View into Government Cybersecurity

A View into Government Cybersecurity

DJ Rich
Posted: March 26, 2024

I attended the Rocky Mountain Cyberspace Symposium to understand government and industry efforts to bolster the nation's cybersecurity.
Reinforcement Learning at Lyft

Reinforcement Learning at Lyft

DJ Rich
Posted: January 04, 2024

A few comments on the Reinforcement Learning work done by my colleagues at Lyft
When does the Delta Method approximation work?

When does the Delta Method approximation work?

DJ Rich
Posted: November 01, 2023

I explore when the Delta Method approximation works and fails.
Good Data Science is Mostly Dispatch

Good Data Science is Mostly Dispatch

DJ Rich
Posted: October 27, 2023

Most of what explains a job well done is the choice of tool.
Summaries

Summaries

DJ Rich
Posted: October 09, 2018

This briefly summarizes each part of the series on Probabilistic Graphical Models.
Notation Guide

Notation Guide

DJ Rich
Posted: October 09, 2018

Notation can be confusing. This post is to address it directly.