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How does cosine similarity work?
Cosine similarity measures the angle between two vectors — the dot product divided by the product of their magnitudes. Here's what each part of the formula does.
Topics /
AI & Machine Learning
The most popular blog posts about ai & machine learning on Hacker News. 3,091 posts.
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A complete 4-year course plan for an AI undergraduate degree
I describe in-depth the courses necessary for a 4-year undergraduate degree in artificial intelligence, assuming you step onto campus tomorrow.
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OpenAI: Facts from a Weekend
Approximately four GPTs and seven years ago, OpenAI’s founders brought forth on this corporate landscape a new entity, conceived in liberty, and dedicated to the proposition that all men might live…
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How to attract AI bots to your open source project
A practical guide to getting the engagement your project deserves.
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Brain Uses Quantum Effects, New Study Finds [video]
Science News, Physics, Science, Philosophy, Philosophy of Science
1749
I passionately hate hype, especially the AI hype
I truly and passionately hate hype. From the fakeness of it to the sheer stupidity it represents, but perhaps most of all, because of the devastating consequence it often results in.
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Is Sora the beginning of the end for OpenAI?
On my podcast this week, I took a closer look at OpenAI’s new video generation model, Sora 2, which can turn simple text descriptions into ... Read more
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Technology predictions
Some of these are probably apocryphal, but making predictions about the limits of technology is really hard: Space travel is utter bilge. - Dr. Richard van der Reit Wooley, space advisor to...
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Scaling long-running autonomous coding
Wilson Lin at Cursor has been doing some experiments to see how far you can push a large fleet of "autonomous" coding agents: This post describes what we've learned from …
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Remembering Doug Lenat and his quest to capture the world with logic
Stephen Wolfram shares memories of Doug Lenat, early AI pioneer and developer of the CYC system. Their discussions around AI & logic and the potential combined uses of their respective discoveries.
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Task-specific LLM evals that do and don't work
Evals for classification, summarization, translation, copyright regurgitation, and toxicity.
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Executing gradient descent on the earth
A common analogy for explaining gradient descent goes like the following: a person is stuck in the mountains during heavy fog, and must navigate their way down. The natural way they will approac......
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Hacking the Humane AI Pin
On February 18, 2025, Humane announced it would be shutting down all services for the always online Humane Ai Pin in ten days, following a sale to HP . I had been vaguely aware of the Ai Pin, definitely more so than the average tech person, as I have a close friend who was one of the earliest adopters and eventually…
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Farewell, Marvin Minsky
Stephen Wolfram describes his friendship and shared interest in computation with the late Marvin Minsky, pioneer of computation and AI.
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Do I belong in tech anymore?
On quitting, the spread of AI, and the loss of an ideal.
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Aligned to whom?
You are relying very heavily on the priors of the model to do a good job for you. What happens when you cannot judge whether those priors are good?
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Data scientists shouldn’t need to know Kubernetes
[Hacker News discussion, Twitter thread]
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Remarks on AI from NZ
Last week I participated in a panel discussion on AI as part of a private event in New Zealand.
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Remaking old computer graphics with AI image generation
Can AI Image generation tools make re-imagined, higher-resolution versions of old video game graphics? Over the last few days, I used AI image generation to reproduce one of my childhood nightmares. I wrestled with Stable Diffusion, Dall-E and Midjourney to see how these commercial AI generation tools can help retell…
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Trying out Gemini 3 Pro with audio transcription and a new pelican benchmark
Google released Gemini 3 Pro today. Here’s the announcement from Sundar Pichai, Demis Hassabis, and Koray Kavukcuoglu, their developer blog announcement from Logan Kilpatrick, the Gemini 3 Pro Model Card, …
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A conversation with Sussman on AI and asynchronous programming
A couple weeks ago I made it to the FSF's 30th anniversary party. It was a blast in many ways, and a good generator of many fond memories, but I won't go into depth of them here. One particularly exciting thing that happened for me though was I got to meet Gerald Sussman (of SICP !) The conversation has greatly…
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Machine intelligence, part 1
This is going to be a two-part post—one on why machine intelligence is something we should be afraid of, and one on what we should do about it. If you’re already afraid of machine intelligence,...
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Feeling Sad about AI
Coding in Rust and others; making coding videos.
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What will be left for us to work on?
My keynote at ICML 2026
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Gemini and Google's Culture
The Google Gemini fiasco shows that the biggest challenge for Google in AI is not business model but rather company culture; change is needed from the top down.
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How Alexa dropped the ball on being the top conversational system
I discuss why Alexa missed the opportunity to take the lead and become the dominant player in the conversational AI market.