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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 Incident with Actions and Pages
https://github.blog/news-insights/company-news/an-update-on-...
rossant··on Porting 3D Movie Maker to Linux
Brings me back! Well done!
rossant··on David Attenborough's 100th Birthday
Looking at him I can't believe he's 100. I haven't seen that many centenaries that look that fit.
rossant··on Louis Rossmann offers to pay legal fees for a threatened OrcaSlicer developer
One can understand why Internet access is useful, but why would it have to be mandatory?
rossant··on Hand Drawn QR Codes (2025)
They likely encode not URLs for the public, but internal identifiers that are only useful internally.
rossant··on Agent Skills
Exactly. Glad to see someone else articulate this so clearly.
rossant··on Why TUIs are back
I think TUIs have started to become popular again a few years ago, before Claude Code was released?
rossant··on Music with Lyrics Interferes with Cognitive Tasks (2023)
I can totally relate. I often listen to instrumental music while I work. Lately I've listened to music with lyrics and I have a slightly harder time reading, writing and thinking. Not being a native English speaker and not understanding everything helps though.
rossant··on Why I'm Done Making Desktop Applications (2009)
I was curious why AI wasn't mentioned. Then I noticed the date: 2009.
rossant··on 5x5 Pixel font for tiny screens
Whoa, amazing!
rossant··on ChatGPT Pro now starts at $100/month
How much was it before?
rossant··on The threat is comfortable drift toward not understanding what you're doing
Seeing these constructs in a text is not just a vague hint that it was AI-generated. It's a smoking gun.
rossant··on Show HN: SyNumpy – a Header only C++17 library for working with NumPy Arrays
Many research labs generate GBs of data as npy files. Having readers in languages other than Python is useful when you have programs in other languages that need to process them.
rossant··on Artemis II's toilet is a moon mission milestone
I had the same realization lately. Shouldn't it be said more specifically that anything that consumes matter to turn it into energy (as all living things on Earth) must poop? If we make the distinction between mass and energy of course.
rossant··on Oracle slashes 30k jobs
"eliminate".

Right.

rossant··on Alzheimer's disease mortality among taxi and ambulance drivers (2024)
Amazing. Paper-based GPS before actual GPS was a thing.
rossant··on Mayor of Paris removed parking spaces, reduced the number of cars
I've lived in Paris for 20 years without even having the driver's license.
rossant··on Nobody finishes reading my books
Ironically, I read this article from start to finish, something that rarely happens with blog posts, which I usually abandon halfway through.

More seriously, I agree that writing short books or articles is an important skill. Writing long is easy; conveying the same amount of information concisely is much harder. It is also a sign of respect for busy readers.

I constantly find myself asking LLMs to be shorter, more direct, and more to the point, without fluff. They seem to have a tendency to generate endless streams of words.

rossant··on Ask HN: How to be alone?
> Have you ever felt like you needed to record a conversation you had with your partner?

Just curious what you meant by that?

rossant··on Textadept
Now, everyone can vibe code their own text editor.
rossant··on Ask HN: Who wants to be hired? (March 2026)
Location: Paris/France

Remote: full-time or almost full-time

Willing to relocate: no

Technologies: Python, NumPy/SciPy, Jupyter, Django, Qt, C, C++, C#, Vulkan, OpenGL, CUDA, WASM, HTML/CSS/Javascript

Résumé/CV: https://bit.ly/4aZbYTX

Email: hn@rossant.net

As a math/CS PhD and research software engineer in an international neuroscience research lab, I develop a broad range of software for science and data analysis: AI / ML models, GPU graphics and computing, interactive data visualization, high-performance scientific computing, databases, GUIs, mobile/web applications and websites. I co-created the VisPy and Datoviz GPU scientific visualization libraries. I wrote 4 books on scientific Python.

rossant··on New iPad Air, powered by M4
Thank you for making me feel old. The first iPad came out when I was doing my PhD. When I was a kid, Tim Berners-Lee was inventing the web.
rossant··on Claude Code LSP
Same. I can't this tone. I don't understand why modern LLMs can't show more variability in tone and writing style by default.
rossant··on Psychology: Who dont maintain many close friends, learned independence too early
That LLM-style tone is exhausting.
rossant··on I don't know how you get here from “predict the next word”
Don't assume bad intent.

I use LLMs for different research-related tasks and I surely can relate. In the past few months, the latest models have become better than me at many tasks. And I am not an ad.

rossant··on How will OpenAI compete?
It's very weird to pronounce it as a French. Either you pronounce it like in English with a thick French accent like "tchat' djee-pee-tee" or like in French as "tchat' jay-pey-tey" which sounds exactly like "I farted". This is really a terrible name in French.
rossant··on “Car Wash” test with 53 models
Tangential but first time I hear about rapidata. Sounds interesting.
rossant··on Blood test boosts Alzheimer's diagnosis accuracy to 94.5%, clinical study shows
I agree. I feel that many medical doctors do not share this mindset.
rossant··on How I use Claude Code: Separation of planning and execution
Funny how I came up with something loosely similar. Asking Codex to write a detailed plan in a markdown document, reviewing it, and asking it to implement it step by step. It works exquisitely well when it can build and test itself.
rossant··on 15 years later, Microsoft morged my diagram
A mix between merged, morphed, and morgue. I love it. Should be nominated as word of 2026.
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