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jey

7,578 karma · joined March 25, 2007

human interested in bits and humans

Berkeley, California

Email: jey#kottalam!net

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jey··on Show HN: TurboGPT: train 22KiB transformer in 13s
At that scale it seems like you could just solve the KKT conditions directly. Exaggerating but only a little
jey··on What Zig felt like, coming from Rust
> > which is that over time, as program changes and evolves over years, things tend to drift toward the more general mechanisms that rely on malloc/free on an individual objects, and the program gets slower and slower

I think the idea is that a small program can organize its allocations and data structures to minimize number of calls to malloc, e.g. with preallocated workspace structs, or slab allocation, and similar approaches. But as a program gets bigger, there's a pressure to have looser coupling, to have subsystems with simple convenient APIs which leads to them doing on-demand malloc calls internally, rather than having consumers pre-allocate their needed workspace. Because that kind of workspace management results in more complex APIs and more burden on the consumer.

That said, I don't really believe it either, at least for the kind of codebase where it would matter (scientific computing, in-memory DB server, etc). A codebase that places an emphasis on minimizing heap operations in hot codepaths can do so by consistently using workspaces and allocation-avoiding APIs. I don't think it's so difficult really, but it does take a conscious design decision to do so. But writing something like a web browser in this way could be annoying due to most data having wildly variable sizes, and zig's arena concept would be very handy -- but rust has crates like bumpalo for that purpose.

My personal mantra: "Think in FORTRAN, code in Rust/Julia/C++". But I'm mostly working on HPC-style code where I don't have to do with wildly varying input or output sizes.

jey··on Jean-Pierre Serre turns 100
> I did not like, and did not understand, epsilons and deltas.

It's nice to have this perspective validated by someone like Serre! I felt like I was missing something when I first encountered that formalism. In fact, all of my introductory calculus classes sucked and turned me off of math for a few years.

jey··on iPhone Duo
Personally I love this concept. I’d be able to stop carrying my laptop around and just monitor/respond to things via SSH from my phone.
jey··on The ColorChecker, photography's most important 24 squares, turns 50
You sound like you actually want to just generate them yourself using ArgyllCMS `targen` and `printtarg`.
jey··on Stripe said to abandon $50B pursuit of PayPal
None of this makes sense or is supported by the facts. Stripe is reportedly valued at $159B, PayPal's market cap is currently $52.59B, and your claims about memes and Wall St are asserted without any citations or facts.
jey··on Radiation link in flight attendant's breast cancer, French court finds
Yeah, that was my reaction too. But there is a subfield called interventional radiology, perhaps GP post is referring to that?
jey··on Why does Opus 5 feel worse to work with?
It's project management jargon: https://en.wikipedia.org/wiki/Pre-mortem
jey··on My phone detects going on a run as “someone snatching my phone and running off”
This might just be realistic about the median American's tolerance for walking. Most Americans live in suburbs that are not walkable. At least, I know my own tolerance for walking is very abnormal for an American, and it's due to having lived in walking-oriented cities like Berkeley.
jey··on I am retiring from fulltime writing (& pseudonymity) to launch Guardian Angel
Obviously the costs will come down over time. And quickly.
jey··on All major LLMs are lib-left. Even Grok, half the time
The author cites a study (Rozado, 2024, in PLOS ONE) that supposedly shows the base models (before assistant-specific post-training) basically scored at the center (0, 0).

https://unslop.run/blog/assets/exp13/f7_context.png

jey··on GPT-5.6 Sol Ultra produces proof of the Cycle Double Cover Conjecture [pdf]
I'm not a mathematician, but I don't think that's true..? It's just that some problems are considered "hard" or known to have been "open" for a long time or that involve some clever/pioneering new technique. There's tons of math papers out there that are in some technical sense a novel contribution but in practice just languish without much attention except maybe from like two other people working in the same subfield.
jey··on Ask HN: Since when does Craigslist's front page have emojis?
> Emojis don't even render the same on every platform

This is a feature, not a bug. That it's using your platform-specific emojis makes it easier to scan, since it's the ideograms you are already accustomed to. Much faster to scan familiar symbols than to read each section heading serially.

jey··on Show HN: I Derived a Pancake
Relevant: The Breakfast Simplex (https://moultano.wordpress.com/2026/02/22/the-hunt-for-dark-...)
jey··on Boeing 787 Dreamliner Loses Door at Remote Pacific Airport, Puzzling Engineers
I thought other reporting claimed that a ground handling truck crashed into the door, thereby detaching it?
jey··on High dimensional geometry is transforming the MRI industry (2017) [pdf]
I'm not convinced this is a problem. For example, all the folks who developed convex analysis for its pure geometric and mathematical beauty in the land of pure Platonic forms, well their work was still useful downstream for all of us doing convex optimization and dealing with log-concave probability distributions. So no harm, no foul.
jey··on Six (and a half) intuitions for KL divergence
Try the textbook Elements of Information Theory by Cover and Thomas (2006)
jey··on C89cc.sh – standalone C89/ELF64 compiler in pure portable shell
It targets x86-64/ELF? I thought it would target `sh` to be portable?
jey··on First in-utero stem cell therapy for fetal spina bifida repair is safe: study
That doesn't really explain anything biologically. Just vaguely says "potentially helps heal and protect"
jey··on First in-utero stem cell therapy for fetal spina bifida repair is safe: study
What does the stem cell treatment help with beyond the existing fetal surgery? Since it's in addition to the usual surgical treatment
jey··on Julia: Performance Tips
And I would further add: In addition to performance, Julia's language and semantics are much more ergonomic and natural for mathematical and algorithmic code. Even linear algebra in Python is syntactically painful. (Yes, they added the "@" operator for matmul, but this is still true).
jey··on Banned in California
I wonder if there's a law+econ analysis of comparing the current framework (regulations and upfront permitting) vs having the regulations but then enforcement via combination of randomized gov't inspections and private lawsuits. The motivation would be to allow things to move faster while also requiring the same degree of compliance, but without the massive red tape upfront with administrators having no real incentive to approve projects or move fast. One obvious downside is that it effectively creates an economic incentive to try and skirt the law and/or find loopholes, but that arguably exists to the same degree in the existing system.
jey··on International box-sizing Awareness Day (2014)
(2014)
jey··on Palantir's secret weapon isn't AI – it's Ontology. An open-source deep dive
This seems to be the English landing page: https://github.com/Leading-AI-IO/palantir-ontology-strategy/...
jey··on The original vi is a product of its time (and its time has passed)
have you tried vim or neovim?
jey··on When AI 'builds a browser,' check the repo before believing the hype
lmao okay, touché. I did not realize it had servo as a dependency.
jey··on When AI 'builds a browser,' check the repo before believing the hype
I don't think the point was to say "look, AI can just take care of writing a browser now". I think it was to show just how far the tools have come. It's not meant to be production quality, it's meant to be an impressive demo of the state of AI coding. Showing how far it can be taken without completely falling over.

EDIT: I retract my claim. I didn't realize this had servo as a dependency.

jey··on Six-decade math puzzle solved by Korean mathematician
Dan Romik has a nice intro on the moving sofa problem: https://www.math.ucdavis.edu/~romik/movingsofa/
jey··on Baffling purple honey found only in North Carolina
Yeah maybe time to send a sample to the “mass spec everything” guy
jey··on NY Fed cash transfers to banks increase dramatically in Q4 2025
Here's a less editorialized article from Reuters: https://www.reuters.com/business/finance/banks-tap-record-li...
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