State of the art advances in applied machine learning with a focus on recommender systems
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recsysml.substack.comLatest Issues
LLM Evals From Scratch: Run Your First Benchmarks
Prerequisites
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Python 3.9+
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A terminal and a virtual environment
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No GPU required (CPU is fine for GPT-2)
Step 1 — Why training loss isn’t enough
Here’s a failure mode worth knowing before you spend time traini...
Personalization at Bluesky
At Bluesky, we are building an open foundation for the social internet, where anyone can create a feed, such as the Science feed, For You feed by spacecowboy, or GLAMS feed. We also aim to provide a great default Discover feed. This post di...
The Mathematics of Intelligence: A Deep Dive into LLM Training
Creating a state-of-the-art Large Language Model (LLM) is not a single act of training. It is a multi-stage evolution that transforms a raw neural network from a statistical pattern-matcher into a refined, reliable assistant.
This post bre...
Modernizing GPT-2: A Journey from 2019 to 2025
Part I
Link to GitHub Repository
Introduction
GPT-2 is a legendary model, effectively the “Hello World” of modern LLMs thanks to Andrej Karpathy’s nanoGPT. But in the fast-moving world of AI, 2019 might as well be ancient hist...
A framework for ML Design Interviews
Over time, we have developed a framework for approaching ML Design interviews. Using this framework has had a high success rate. (11+ successful offers at E9 to E6 at Meta/Google/etc, 1 failure). Having a framework allows you to (a) ensure...
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Authors
The writers behind this newsletter.
- Applied ML in Recommender systems (Facebook / Instagram, Google, Discord) - 20 years in Applied ML
An ML Researcher obsessed with how intelligent systems actually work. I write about machine learning, intelligence, and decision-making from first principles, favoring intuition over formulas, clarity over hype, and understanding over consensus.
I geek on RecSys
Rahul has over a decade of experience in artificial intelligence and machine learning. He has a PhD in computational neuroscience and is currently working ML engineer at Meta.
ML@Bluesky
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