rck

10 ms·

1.
by rck 7mo ago
Yeah, for professional robotics you just accept that this is the world we live in. But for learning and hobbyist stuff, it's better to play with simple hardware and build the things that ROS is ultimately abstracting over before you t
2.
by rck 7mo ago
The thing that most people don't appreciate is that ROS was co-designed with the PR2, which had a very idiosyncratic architecture: two separate computers in the base, ethercat for comms, not at all modular, and very high end parts (for
3.
by rck 7mo ago
Get an arduino kit and learn a little electronics. The kit likely comes with a brushed motor and a servo. Learn how motors works and how to write code to make motors spin. Then get a stepper motor and an arduino-compatible motor shield or C
4.
by rck 7mo ago
The Stoics are explicitly mentioned in Acts of the Apostles, but I think a better way to think about it is that the framework of "Virtue" as "Conforming to your Nature" is a very useful one for understanding the gospels,
5.
by rck 7mo ago
It's interesting that the main thinkers listed are all Roman. They're definitely the best known, but Stoicism was a Greek philosophy first and foremost, and Cleanthes, Chrysippus, etc. were more significant than any of the Romans.
6.
by rck 11mo ago
Yeah it looks like about 1500 grants: https://www.urban.org/urban-wire/nsf-has-canceled-more-1500-... But if the concern is about the provision allowing NSF to claw back funds that have been spent by the organization t
7.
by rck 11mo ago
I can imagine that a very risk averse lawyer would have pointed out the costs and uncertainties of litigation in cases like this. But if I were in their shoes and I really cared about the money, I would have pressed that lawyer to show exam
8.
by rck 11mo ago
Not a lawyer, but the NSF clause covering clawbacks is pretty specific: > NSF reserves the right to terminate financial assistance awards and recover all funds if recipients, during the term of this award, operate any program in violatio
9.
by rck 1y ago
I'm not sure what motivated Parmenides because he was more of a poet than anything - it just happened that his poetry was what we would now recognize as incredibly philosophical. He didn't really argue, he just wrote down what the
10.
by rck 1y ago
This is fun. But the bit at the beginning about philosophy is not correct. Parmenides did not believe in what we would call essences, but really did believe that nothing ever changes (along with his fellow Eliatic philosopher Zeno, of parad
11.
by rck 1y ago
The Nevada Museum of Art had an exhibit last year about Picasso's ceramics, and I was amazed at how ... meh it all was. Apparently the market agrees with me, because you (yes you!) can buy a Picasso plate for just a few thousand dollar
12.
by rck 1y ago
Pope Pius XI wrote about _subsidiarity_ as a guiding social principle: "Just as it is gravely wrong to take from individuals what they can accomplish by their own initiative and industry and give it to the community, so also it is an i
13.
by rck 1y ago
This feels like the kind of popsci that's written for people who already agree with the author - there's nothing resembling an argument, or even a definition of "computation." There are nods to Church-Turing, but the lea
14.
by rck 1y ago
In 2023, shrinkage at Costco was less than 0.2%, vs a US national average of 1.44%. https://finance.yahoo.com/news/costco-winning-war-against-re...
15.
by rck 1y ago
This is the Lean blueprint for the project, which is a human-readable "plan" more or less. The actual Lean proof is ongoing, and will probably take a few more years. Still cool though.
16.
by rck 1y ago
For the sake of comparison, you can train a 124M model on a 3090 (see nanoGPT). In that case, each batch ends up having about 500,000 tokens and takes maybe around 10ish seconds to run forward and backward. Then the 6 trillion tokens that t
17.
by rck 1y ago
You are underestimating the hype around self-driving. A quick search gives this from 2018: https://stanfordmag.org/contents/in-two-years-there-could-be... The open (about the bet) is actually pretty reasonable, but som
18.
by rck 1y ago
Do you know of any short examples of this? Yesterday I was trying to prove some "easy" theorems that involved machine number representations, and I couldn't find anything in Lean.
19.
Verified dynamic programming with Σ-types in Lean(tannerduve.github.io)
86 points by rck 1y ago|43 comments
20.
It's Not What You Think: LLMs Like Obvious Answers(lemmata.substack.com)
3 points by rck 1y ago|0 comments
21.
Functional Programming and Theorem Proving in Lean 4(web.stanford.edu)
6 points by rck 1y ago|0 comments
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by rck 1y ago
Just about everything that a non-specialist in combinatorics needs to know about counting can be found in Rota's twelvefold way, which lists the 12 counting problems that you can define for finite sets and shows how to solve them: htt
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by rck 2y ago
They're claiming some revolutionary "synthetic muscle," but is there video of one of these things walking? If it's just pneumatics then this is a repeat of the early androids out of Japan, which looked cool but never got
24.
by rck 2y ago
Yup! Lean is based on a variant of the Calculus of Constructions, which is in turn based on strong connections between (intuitionistic) natural deduction and type theory. The connection is incredibly beautiful: https://en.wikiped
25.
by rck 2y ago
It's interesting that, at least through ollama, it appears impossible to get DeepSeek-R1 to give concise answers to questions that don't require any reasoning.
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by rck 2y ago
Before you read this, it's worth your time to check out Haraway's Wikipedia page. The criticism section sums things up nicely: Haraway's work has been criticized for being "methodologically vague" and using noticea
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by rck 2y ago
You could play with open models and different temperatures using the lmgen script from this repo we just released: https://github.com/RichardKelley/hflm?tab=readme-ov-file#lmg...
28.
Show HN: Easily generate text and compute probabilities for any Hugging Face LLM(github.com)
2 points by rck 2y ago|0 comments
29.
by rck 2y ago
Thank you!
30.
by rck 2y ago
The other reply linked to a good explanation. I would only add that I also wrote a paper on Dendron, and Figure 17 shows how to transform a decision tree node into a behavior tree, so that you can implement any decision tree as a behavior t

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