Hacker News: eismcc

New comment by eismcc in "Ask HN: What are you working on? (February 2026)"

eismcc — Mon, 09 Feb 2026 01:45:12 +0000

I added autograd support to the KlongPy array language. It’s been fun to integrate PyTorch and come up with new examples.

https://klongpy.org

Show HN: KlongPy array language now supports autograd

eismcc — Thu, 05 Feb 2026 17:59:44 +0000

Hello HN!

I had some free time so I have been upgrading KlongPy.

KlongPy now supports PyTorch as a backend and autograd over the array language.

A while back someone on HN thought it would be cool to have Klong support autograd and I also thought that would be cool.

There's a lot of examples in https://github.com/briangu/klongpy/tree/main/examples/autogr...

but here's a taste:

f::{x^2} :" Define f(x) = x^2 f:>3 :" Compute f'(3) = 6.0

Looking for feedback on new operators and any obvious gaps. Thanks!

updated github pages: https://klongpy.org repo: https://github.com/briangu/klongpy

Comments URL: https://news.ycombinator.com/item?id=46902508

Points: 1

# Comments: 0

New comment by eismcc in "Zork: The Great Inner Workings (2020)"

eismcc — Mon, 20 Jan 2025 19:05:55 +0000

You may want to look into the nintendo zelda chemistry engine

New comment by eismcc in "A marriage proposal spoken in office jargon"

eismcc — Wed, 15 Jan 2025 19:12:26 +0000

I’m ded

New comment by eismcc in "KlongPy: High-Performance Array Programming in Python"

eismcc — Tue, 03 Dec 2024 20:08:06 +0000

Not yet. I want to make an online book.

New comment by eismcc in "KlongPy: High-Performance Array Programming in Python"

eismcc — Tue, 03 Dec 2024 01:20:19 +0000

I don’t use windows so not sure.

New comment by eismcc in "KlongPy: High-Performance Array Programming in Python"

eismcc — Tue, 03 Dec 2024 01:10:56 +0000

Numpy is just the backend and KlongPy has a lot more application features than Numpy. You can see something like kdb+ as inspiration.

New comment by eismcc in "KlongPy: High-Performance Array Programming in Python"

eismcc — Mon, 02 Dec 2024 17:55:57 +0000

KlongPy has a lot of other features beyond pure NumPy operations (such as IPC and web server), which you could see as a kind of making use of array operations in some application. You could look at the core Klong language as what you suggest.

New comment by eismcc in "KlongPy: High-Performance Array Programming in Python"

eismcc — Mon, 02 Dec 2024 17:34:45 +0000

KlongPy author here: AMA

New comment by eismcc in "Ask HN: What are you working on (September 2024)?"

eismcc — Mon, 30 Sep 2024 12:32:46 +0000

Working on WaddleML, and open source variant of weights and balances that uses DuckDb.

https://github.com/briangu/waddleml

New comment by eismcc in "The future of kdb+?"

eismcc — Sat, 03 Aug 2024 16:26:56 +0000

You can do realtime in the sense that you can build Numpy arrays in memory from realtime data and then use these as columns in DuckDb. This is approach I took when designing KlongPy to interop array operations with DuckDb.

New comment by eismcc in "Breakthrough a step toward revealing hidden structure of prime numbers"

eismcc — Thu, 01 Aug 2024 12:23:07 +0000

I recall that Richard Hamming used to also reserve Friday afternoons to deep/big thinking. Sounds wonderful.

New comment by eismcc in "Connection Machine Lisp (1986)"

eismcc — Sat, 22 Jun 2024 00:22:21 +0000

Steve Omohundro was one of the main authors of starlisp.

New comment by eismcc in "Flowers for Algernon (1965) [pdf]"

eismcc — Mon, 11 Mar 2024 13:43:56 +0000

After my class read this book in high school, we wrote the author and he responded. How often does that happen in today’s schools?

New comment by eismcc in "K/simple: a tiny K interpreter for educational purposes by Arthur Whitney"

eismcc — Thu, 18 Jan 2024 02:37:39 +0000

Thanks the insights. Not to over do self promotion, but aside from learning, the main reason I made KlongPy was to allow for optionality with the ecosystem. Use Klong for array operations and other libraries for standard stuff.

New comment by eismcc in "K/simple: a tiny K interpreter for educational purposes by Arthur Whitney"

eismcc — Wed, 17 Jan 2024 21:03:59 +0000

shakti has GPU support now, i believe.

New comment by eismcc in "K/simple: a tiny K interpreter for educational purposes by Arthur Whitney"

eismcc — Wed, 17 Jan 2024 20:32:13 +0000

Arthur Whitney is showing how to build an array language using C in array language form.

AW is known for kdb+ which is often used in finance due to its extreme performance properties and ability for quants to quickly explore ideas.

Personally, to get a better handle on how array languages worked, I implemented KlongPy which is a python implementation of Klong, which descends from K (which AW wrote).

You have to play with this stuff to understand it intuitively.

New comment by eismcc in "Thinking in an array language"

eismcc — Sat, 13 Jan 2024 19:38:41 +0000

In KlongPy, dot product is: dot::{+/x*y}

    P::[2 3 4]
    Q::[1 0 2]
    dot(P;Q)

New comment by eismcc in "k on pdp11"

eismcc — Thu, 11 Jan 2024 17:13:06 +0000

Just gonna say, this is why i wrote KlongPy - an array language in Python that lets you interop with Python while also getting some array lang. efficiencies. Klong isn't as smooth as K, but it's still quite useful.

New comment by eismcc in "k on pdp11"

eismcc — Mon, 08 Jan 2024 18:50:54 +0000

Judging by the google group, they are in early development phase and are onboarding their first customer.