I was so confused by the word factorial in the first example for a language, but decided to click it and just see what it means
replyTurns out, Futhark != https://en.wikipedia.org/wiki/Futhark (runes, old germanic alphabet)
That's like calling your programming language Latin?! The title could use some disambiguation...
Eh. Words get overloaded all the time and this is a website focusing on programming after all. Would you consider "Python by example" or "C by example" to need disambiguation because they're not about snakes or about the third letter of the alphabet?
replyAlso the very first line on that page is "The Futhark Programming Language" so if you were still confused after that I think it's on you.
> That's like calling your programming language Latin?!
replyMore accurately it would be like calling it Alphabet, since that takes its name from Alpha Beta (AB) just like the Futhark takes its name from the first letters in it.
It is a pretty confusing name. Personally I'm waiting for someone to name a programming language Womble. Underground, overground, you're free to use it as long as you work as a team and are tidy and clean.
replyFuthark is really such a great idea. I'm not convinced that dependent types are worth the cognitive overhead in general, but it's definitely worth it to include the length as part of the type information for dynamic arrays, e.g.:
reply concat(Vec<T, n>, Vec<T, m>) -> Vec<T, n+m>
matmul(Mat<T, n, m>, Mat<T, m, l>) -> Mat<T, n, l>
head(Vec<T, n+1>) -> (T, Vec<T, n>)
Here they are in Futhark:
reply val concat [n] [m] 't : (xs: [n]t) -> (ys: [m]t) -> *[n + m]t
val matmul [n] [m] [l] 't : (xs: [n][m]t) -> (ys: [m][l]t) -> *[n][l]t
val head [n] 't : (x: [n]t) -> t
val filter [n] 'a : (p: a -> bool) -> (as: [n]a) -> *[]a
The Pyrefly type checker is starting to work on this kind of shape hinting - so far it only works on Torch but I believe the plan is for it to work with other array packages (eg. JAX, NumPy)
replySee also jaxtyping which, contrary to what its name might imply, covers JAX/PyTorch/NumPy/MLX/TensorFlow arrays and tensors.
replyShape functions and shape analysis are basically mundane infra in almost every ML compiler/language/DSL.
replyI didn't know that, thanks for sharing. It makes sense, but then it also makes me wonder why none of the deep learning libraries (Torch, Jax/NNX, Eigen etc...) make this information available. Instead, ML people all have their own schemes for tracking shape information, like commenting '# (b, n, t)' on every line, or suffixing shapes to variable names - and in my experience it's a common source of bugs.
reply> Torch, Jax
replyBoth of these "make it available". Just because people don't know how to use/find them doesn't mean they're not "available".
> Eigen
This is not an ML anything, it's a linear algebra library.
> like commenting '# (b, n, t)' on every line, or suffixing shapes to variable names
There's a difference between tracking shapes in the compiler and specifying shapes in the model.
You can do this with templates in C++ and generics in Rust I'm pretty sure. I think the Eigen C++ library supports this. (I have yet to do a linear algebra heavy Rust project, so I can't speak to the options that exist there.)
replyI'm talking about cases where the array size is not known at compile time. For example, say the user passes in a list of numbers as command line arguments. Then we have
reply argv: Vec<String, argc>
nums: Vec<Int, argc>
Yeah, C++ arrays are literally that.
replyArrays are not dynamically sized though (handling runtime sizes) and don’t have efficient append/concat. The point of the dependent types is that you can have the type system track that concat creates an M+N length vector, sort preserves length (and adds a sorted guarantee that slice preserves), etc.
Sure you can do a lot with templates, but that’s advanced templates not just “C++ arrays” in a throwaway “literally that” way.
replydeleted
replydeleted
replyIt would be nice to not name your language after another language. (Yes I know it's a script, that doesn't change my point). I came here expecting something else.
replyJackson Crawford's youtube channel is very helpful academic source.
replyFor those that don't know, Futhark is comes from the first 6 letters of the runic alphabet (F, U, Þ, A, R, K)
Yeah, when naming your language, it's important to keep mind the expectations of people seeing headlines about articles about your language on blog aggregation sites :^)
replyNow I'm thinking about "Smalltalk by Example" and "Slang by Example"
Same here, I was very confused for a bit.
replyFuthark is a glimmer of light in the wasteland of C/C++ styled low level GPU languages.
replyWe also need to have StarLisp back, it would be quite fitting.
replyFuthark is pretty great! And I have to say that the maintainer is insanely quick. It has happened on more than one occasion that I reported a bug and it's solved within the day. I have been using Futhark in prod for two years now and never had serious problems.
replyInteresting, what do use it for if you can share?
replyOptimization algorithms. The build in automatic differentiation is great!.
replyWhat is your use case?
replyWas expecting to see some examples of how to read runes, but I am nonetheless equally satisfied.
replySame. Thought I had a copy of Uthark [1][2] on my shelf too but alas I seem to have only retained Svartkonst [3] during the tragic downsizing of my library.
reply[1] https://archive.org/details/karlsson-thomas-uthark-nightside...
[2] https://www.84cxrarebooks.com/pages/books/090763/t-ketola-th...
[3] https://www.miskatonicbooks.com/product/thursakyngi-iv-svart...
Couldn’t have chosen a more difficult (and ambiguous) name to pronounce, could you? It almost sounds like a curse that I often hear people say out in the bad streets of New York City.
replyElder [0] and Younger [1] Futhark (or Fuþark) are the name of two runic writing systems used by Germanic and Scandinavian Vikings. The name Futhark is a combination of the first 6 runes /f/, /u/, /ð/, /ɑ/, /r/, and /k/. Similar to how you get the name "alphabet" from the first two letters of Greek's writing system.
replyi had only skimmed this link and not even wondered about the name - but learned the meaning serendipitously within 2 minutes when it popped up in the OTHER hackernews link i had opened:
https://news.ycombinator.com/item?id=48118478 which links to https://en.wikipedia.org/wiki/England_runestones
replyFuthark appears in the first paragraph! i don't think i ever read the term before