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rossant

3,500 karma · joined September 10, 2014

I'm Cyrille Rossant, a neuroscience researcher and software engineer at the International Brain Laboratory and University College London.

I'm interested in mathematics, scientific computing, data visualization, computer graphics, GPU programming, web applications, AI. I wrote several books on Python for scientific computing.

After a sudden personal event, I decided to devote a large portion of my research activities to the shaken baby syndrome controversy: https://news.ycombinator.com/item?id=37650402

- Website: https://cyrille.rossant.net

- Email: first name dot last name at gmail dot com

submissionscomments
rossant··on An AI Agent Published a Hit Piece on Me – Forensics and More Fallout
The difference is that bots go much faster and don't take any break. That's in part what makes them so dangerous.
rossant··on AI optimism is a class privilege
There’s an argument I don’t hear very often. Society is becoming increasingly dependent on data/compute centers running AI models. It would take only a few bombs from a hostile country to disrupt the entire economy, army and so on, especially if workers can no longer do anything useful without AI.
rossant··on An Update on Heroku
I had to read it 5 times. What was announced exactly? Obfuscation is a huge red flag in announcements like this.
rossant··on Something Big Is Happening
Unpopular opinion but I kind of agree. I've been using Codex extensively these past few months. Using the latest paid models. Something is changing. It was a nice assistant before. In the past few weeks, I realized it became better than me in making architectural decisions on low-level performance-critical code. For the first time, I realize that I prefer his decisions rather than mine. He is just better now. I have 30+ years of programming experience. I agree with the author that we should get ready to adapt quickly to a world that may soon become radically different.
rossant··on What Every Programmer Should Know About Memory [pdf] (2007)
(2007)
rossant··on GitHub Actions is slowly killing engineering teams
I also sense an LLM vibe in this post.
rossant··on Drug trio found to block tumour resistance in pancreatic cancer in mouse models
I opened the comments fully expecting the top reply to be “In mice.” Bingo.
rossant··on When two years of academic work vanished with a single click
Genuine question: how do you backup (and reimport) a bunch of ChatGPT conversations?
rossant··on First, make me care
Fifteen years ago, I ran a YouTube channel with hundreds of obscure French videos about pediatrics and parenting. One of them suddenly attracted massive attention worldwide, especially from Pakistan and Indonesia. According to the stats, 99% of the viewers were male. Millions and millions of views. For months, it sat in the top five French videos on YouTube. Ad revenue went through the roof, like three figures per day, for months, from that single video. None of the others on the channel saw anything remotely similar. It was baffling.

Then I understood why. The automatic thumbnail generator had picked a frame from the exact middle of the two-minute video. It showed a close-up of a newborn heel prick test: a nurse firmly holding the baby’s heel and pricking it to collect a drop of blood for routine postnatal genetic screening. The thumbnail frame looked like a skin-colored cylinder grasped by a woman’s hand.

Thankfully, the flood of comments, expressing disgust and horror at a medical procedure on a newborn after viewers had expected something entirely different, did not prevent the algorithm from enthusiastically recommending that thumbnail to a significant fraction of humanity.

rossant··on Zotero 8
Zotero had been “not good enough” for many years. Since version 7, it has become nearly perfect for me. I can’t recommend it highly enough.
rossant··on ChatGPT Health
Out of curiosity, what was the stuff you thought was healthy but was destroying your health?
rossant··on Maybe comments should explain 'what' (2017)
I do it, but I also like to use headers.
rossant··on Maybe comments should explain 'what' (2017)
I like to use comments extensively, even if it’s just to visually separate blocks of code in my IDE. A bit more spacing simply feels cleaner to me.
rossant··on Show HN: 22 GB of Hacker News in SQLite
Guilty.
rossant··on Fabrice Bellard Releases MicroQuickJS
Perhaps closer to 100x actually.
rossant··on I'm Kenyan. I don't write like ChatGPT, ChatGPT writes like me
Why can't the LLM refrain from improving a sentence that's already really good? Sometimes I wish the LLM would just tell me, "You asked me to improve this sentence, but it's already great and I don't see anything to change. Any 'improvement' would actually make it worse. Are you sure you want to continue?"
rossant··on Useful patterns for building HTML tools
Awesome. This is the way.
rossant··on 4 billion if statements (2023)
Nice, that swaps odd and even around.
rossant··on The "confident idiot" problem: Why AI needs hard rules, not vibe checks
Lately, ChatGPT 5.1 has been less guilty of this and sometimes holds off answering fully and just asks me to clarify what I meant.
rossant··on Patching Pulse Oximeter Firmware
> As a side note: replacing the chip took longer than expected. I accidentally ordered a GD32F350R8T6, instead of the GD32F350RBT6 that was in the device originally. These two types differ in their flash sizes: 64 kB vs 128 kB. Don’t ask me why GigaDevice thought this naming scheme and this font was a good idea

An 8 looking almost exactly like a B. What a terrible idea.

rossant··on AI agents break rules under everyday pressure
Very interesting. Is there any other simulation that also exhibits spontaneous illegal activity?
rossant··on An Homage to 90s –/Public_HTML Hosting
Thanks for this! I wasn't aware of this reference.
rossant··on Why are static site generators so complicated to use?
I had a great experience with using Hugo to set up a relatively complex multilang website with a lot of custom advanced workflows.

The twist is, OpenAI Codex did all the setup. I described precisely what I wanted in natural language. Codex did a perfect job.

rossant··on New Jersey high court first in US to ban Shaken Baby Syndrome testimony
A major milestone in the fight against wrongful medical determinations of SBS/AHT. Proud to have made a tiny contribution to this case (disclosure: signed an amicus curiae). More context: https://news.ycombinator.com/item?id=37650402
rossant··on Our investigation into the suspicious pressure on Archive.today
That doesn't seem totally implausible.
rossant··on AI World Clocks
Have you tried OpenAI Codex with GPT5.1? I'm using it for similar GPU rendering stuff and it appears to do an excellent job.
rossant··on Agentic pelican on a bicycle
What prevents LLM designers from cheating and including a human handcrafted SVG into the model for this specific request (allowing for variations between calls)?
rossant··on FFmpeg to Google: Fund us or stop sending bugs
Is the idea that ffmpeg could change its license and wreak havoc?
rossant··on AI adoption in US adds ~900k tons of CO₂ annually, study finds
Sure, though there’s a difference between extracting energy stored for millions of years and capturing the continuous flow of energy from the sun.
rossant··on I'm making a small RPG and I need feeback regarding performance
Sounds like something is going really bad. I'd be very curious to know what's happening.
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