Two months ago I wrote about CBC vs HiGHS on my staff scheduler, where swapping solvers turned a model that took minutes into one that took seconds. So when my daily fantasy lineup optimizer started feeling slow, I reached for the same fix — and HiGHS came back three times slower. This is the story of CBC vs CP-SAT on that model, why my own previous result did not transfer, and the failure mode I found on the way that was worse than being slow.
Continue reading “CBC vs CP-SAT: My Lineup Optimizer Got 8x Faster”Tag: MLB
Posts about the MLB daily-fantasy lineup optimizer and MLB DFS modelling.
The Bug That Ate a Day: It Only Hung in Production
This is the last post in my series on rebuilding my daily fantasy lineup optimizer (it all starts here). The math was the easy part. This post is about the day I lost to a bug that didn’t exist on my computer and only showed up once the tool was on a real server — the kind of problem that makes you question your sanity before you find it.
One Good Lineup Is Easy. Twenty Is the Hard Part.
This is part four of my series on the daily fantasy lineup optimizer I rebuilt this year (the series starts with the origin story). Everything up to now has been about finding the single best lineup. Here’s the uncomfortable truth that took me a while to accept: the single best lineup is the easy part, and it’s not what wins tournaments. The hard, interesting problem is building a set of lineups that are each strong but smartly different. That’s where the real work — and the real edge — lives.
The Multi-Position Trick I Retired From My Optimizer
This is part three of my series on rebuilding the daily fantasy lineup optimizer I started in Excel in 2012 (start here if you missed the first one). This post is about a small, clever trick I used in the spreadsheet for years to handle players who can fill more than one position — and why, when I rebuilt the tool, I deliberately threw it away.
A Fantasy Lineup Is Just a Knapsack Problem
This is the second post in my series about rebuilding the daily fantasy lineup optimizer I first wrote in Excel back in 2012 (the origin story is here). Before I get into the clever parts, I want to start with the simplest and most important idea: a fantasy lineup is just a knapsack problem wearing a baseball cap. Once you see that, everything the optimizer does makes sense.
