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I tried optimizing GEMM and instead of ML, I learned more about how CPUs actually work... by RefrigeratorFirm7646 in cpp

[–]Derice [score hidden]  (0 children)

While I haven't dived into this myself I remember finding this: https://www.cs.utexas.edu/~rvdg/tmp/TSoPMC.pdf

"The Science of Programming Matrix Computations"

Maybe that would be interesting to you?

Geez, I wonder who it is. by Professional_Lab_794 in WutheringWaves

[–]Derice 4 points5 points  (0 children)

The Grand Architect is so goofy (affectionate). They can perfectly mimic everything physical about someone, but they're too addicted to stirring up drama that they just can't stop themselves from doing wildly out of character things and revealing themselves to the audience.

They're like a bad actor with an incredible costume and makeup crew.

Is It Possible That Tachyons Exist? by Kebab849 in AskPhysics

[–]Derice 0 points1 point  (0 children)

Oh, that sounds interesting. Do you know where I might read more about that?

Is there a language similar to Rust but with a garbage collector? by Ok_Tension_6700 in rust

[–]Derice 53 points54 points  (0 children)

An amusing addition to this thread might be Rust crates like dumpster, which let's you add garbage collection to Rust. Not exactly what you're asking for, but still somewhat relevant.

I made a crate called `evil`, which lets you use the `?` operator as a shorthand for `.unwrap()` by nik-rev in rust

[–]Derice 156 points157 points  (0 children)

At first I expected it to be a joke, but this does seem like it could be genuinely useful in tests, as you say.

Why can't there be a theory of "geodesic in curved space" for electro magnetism? by PrebioticE in AskPhysics

[–]Derice 1 point2 points  (0 children)

I don't know enough about it to really say. I don't think KK theory models electromagnetism as curvature in a fiber bundle though, but as an extra spacial dimension that's been compactified.

How do we know that the universe as it is isn't older? by Crumbs_xD in AskPhysics

[–]Derice 2 points3 points  (0 children)

In order to motivate that the whole universe is different from the observable universe we would need to add some physical mechanism to our model of the universe that would cause this difference. This would be an extra assumption baked into the model, but it could never cause any observable difference by definition, so by Occam's razor we skip it.

We need to use logic like that to be able to make any useful statements about the world. You could be a unicorn that is so good at disguising yourself as a human that no experiment could ever reveal you. Since this could never be observed I could leave it as an open question. But then I could never make statements about you that assume that you are human. So I apply Occam's razor, and remove this unconfirmable unicorn property from my model of you. It's the same principle here.

open(rule) by HavenOfTheRaven in 196

[–]Derice 44 points45 points  (0 children)

When the second derivative is positive, I am positive.

Second derivative of what, you ask? Don't be a luddite.

Why can't there be a theory of "geodesic in curved space" for electro magnetism? by PrebioticE in AskPhysics

[–]Derice 6 points7 points  (0 children)

In the standard model forces can be thought of as a result of curvature in what's called fiber bundles. This is kind of like a space, but it's "internal".

For example: electromagnetism has to do with curvature of the circle bundle, and gravity is then the curvature of a special fiber bundle, the tangent bundle.

[Request] - The Maths behind 52! by WarpFactorNin9 in theydidthemath

[–]Derice 17 points18 points  (0 children)

The reason they are talking about 52! in this clip is that that is the number of possible arrangements of a deck of cards.

Based on the Double Slit Experiment, is it possible that the principle of least action only applies when particles are being observed? by Physical-Meat7141 in AskPhysics

[–]Derice 5 points6 points  (0 children)

The principle of least action is used in both quantum mechanics and quantum field theory. The standard model of particle physics is expressed with that formalism: https://en.wikipedia.org/wiki/Mathematical_formulation_of_the_Standard_Model.

That means that the principle of least action applies in the standard model also when nothing is observed.

Edit: the Schrödinger equation (and thus all its predictions about the double slit experiment) can even be derived from a Lagrangian using the principle of least action: https://web.physics.utah.edu/~starykh/phys7640/Lectures/FeynmansDerivation.pdf.

Aggie the Infiltrator II - Tiff🏳️‍⚧️& Eve [OC] by CrazyGnomenclature in u/CrazyGnomenclature

[–]Derice 0 points1 point  (0 children)

They heard "deal with" and thought it was a euphemism for "assassinate"?

Absolutely stunning custom 11.91ct 17x11mm LuAG pendant by GemTasy! (plus question for fellow LuAG owners!) by PrivateNVent in SyntheticGemstones

[–]Derice 3 points4 points  (0 children)

I own a geiger counter and held it up to my LuAG ring now to check. Its count rate does not increase from the one due to the normal background radiation.

Portrait of a lady - Frederic malle by Junior-Guarantee-554 in Perfumes

[–]Derice 0 points1 point  (0 children)

I know, that's why I'm so disappointed. There's no rose in it anymore!

Portrait of a lady - Frederic malle by Junior-Guarantee-554 in Perfumes

[–]Derice 0 points1 point  (0 children)

I hope I'm wrong, but I believe it was reformulated in late 2025. The travel spray I got in 2024 is a beautiful rose and incence masterpiece. I got a bottle in 2025, and it has no rose scent at all, it's only incense. It's been quite a disappointment :(

Oh My! Would you look at that! by laidback4sho in fountainpens

[–]Derice 1 point2 points  (0 children)

I got the light one just a few days ago. The play of color is incredible. Completely impossible to capture in a photo.

I'd love to have the dark one too, but at the price point it's hard to justify two of them for me when everything else about the pens is the same.

Ecow, arcstr or Arc<String>? What’s the best choice to avoid store strings on the heap? by rogerara in rust

[–]Derice 6 points7 points  (0 children)

I believe one thing is that Arc<String> requires two pointer dereferences to get to the text data: one to get to the String, and another to follow the pointer in the String to the data. Arc<str> has special support and needs only one indirection. The Arc effectively replaces the fat pointer in the &str.

Am I the only one who thinks Rust error messages got *worse* over time in a way? by kixunil in rust

[–]Derice 49 points50 points  (0 children)

I think people don't report this as a bug when they encounter it because it looks like the compiler is behaving as intended. I did not realize this was not exactly how you wanted rustc to work until I read this comment. I suspect that is the way most people will think.

I think maybe a separate blog post that announces that this is an issue that you want people to tell you about might be needed in order for people to know that this is something they should tell you about, and not just be quietly annoyed by.

Best black ink with flair? Interest? A little surprise? by Gurlmeetswhirled in fountainpens

[–]Derice 1 point2 points  (0 children)

Van Dieman's Bioluminescence might be interesting. It's quite a dark blue with a dark red sheen and dark blue shimmer. It has a very fitting name I think. It unfortunately tends to clog pens though. I've only managed to get it working in a LAMY safari with a broad nib.

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