cgreerrun

5 ms·

1.
by cgreerrun 11mo ago
Check out Quoridor
2.
How does controlling a robot work? [video](youtube.com)
2 points by cgreerrun 1y ago|1 comments
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by cgreerrun 1y ago
Short explainer for how the control of the SO-100 robot works.
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by cgreerrun 1y ago
Highly recommend LeRobot.
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by cgreerrun 1y ago
> The code is a mixture of C++ for performance-critical parts and Python for everything else. They’re glued together using pybind11, which I’m a big fan of. Nice, I'm a big fan of this combo! Hits the right balance of prototype spee
6.
Designing a Factorio-Inspired Toy Conveyor Belt(youtube.com)
2 points by cgreerrun 2y ago|0 comments
7.
by cgreerrun 2y ago
Not sure how you are sourcing your jobs, but fyi you can get a feed of 1M+ jobs here too: https://xmlfeed.directemployers.org/default Some of the players (ZipRecruiter, etc) might also give you a feed. They generally just w
8.
by cgreerrun 2y ago
The SO100 arm[1] and LeRobot[2] community are great too if you're getting into robotics from the software side of things. Demonstration of the arm: https://x.com/ChrisMGreer/status/1867278261631561996 [1] htt
9.
by cgreerrun 2y ago
You're welcome! I highly recommend the CPU/microchip one too.
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by cgreerrun 2y ago
The only time I really feel like I understand something is by building something with it. So actually writing a CUDA kernel to do grayscale conversion and then tweaking the code. BUT... both the video and the article are useful before you d
11.
by cgreerrun 2y ago
This video is a great explainer too: How do Graphics Cards Work? Exploring GPU Architecture ( https://youtu.be/h9Z4oGN89MU?si=EPPO0kny-gN0zLeC )
12.
by cgreerrun 2y ago
This is incredible. I have a biochemistry and bioinformatics background, and I've always been curious about how easy and cheap it could be to do various experiments at home. Godspeed!
13.
by cgreerrun 3y ago
You're welcome! If you're interested, there is a follow up paper about a method that extends GradTree to a boosted tree as well called GRANDE[1]. [1] https://arxiv.org/abs/2309.17130
14.
by cgreerrun 3y ago
You can use the straight through operator! During the forward pass you sample a discrete outcome given your NN weights to get an error for backprop. During the backward pass you directly propogate through the weights. This GradTree paper[1]
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by cgreerrun 3y ago
Academics should write readable papers
16.
by cgreerrun 4y ago
If you've never used Pybind before these pybind tests[1] and this repo[2] have good examples you can crib to get started (in addition to the docs). Once you handle passing/returning/creating the main data types (list, tuple,
17.
by cgreerrun 4y ago
> I do not recommend anyone use python for anything performance sensitive My default philosophy is to use python _until_ you find something that is performance sensitive, and then make a C/C++ extension for the slow bits. Pybind wor
18.
by cgreerrun 4y ago
Depends on game/environment and—since it's using a GBDT and not a NN—how good you are at feature extraction/selection for your problem. High level, I'd say it's a good way to test a new environment w/out spendi
19.
by cgreerrun 4y ago
> I came up with a nifty implementation in Python that outperforms the naive impl by 30x, allowing a pure python MCTS/NN interop implementation. See https://www.moderndescartes.com/essays/deep_dive_mcts/ G
20.
by cgreerrun 4y ago
In this comment thread, for e.g., you can have your eyes target the [+] or [-] icons, and then click to expand/collapse those. If you had the "eye-track button" you move you eye to [+], tap button, and left click. The main us
21.
by cgreerrun 4y ago
Ah, interesting! So you can ensure you get illumination on the eyes w/out shining annoying, visible light at them. Very cool.
22.
by cgreerrun 4y ago
(Can't reply to your other comment for some reason) Why is the IR part of the spectrum better for the cameras? Is it because if I take an image of my eye and look at the IR part of the spectrum is it just easier to see parts of my eye
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by cgreerrun 4y ago
Maybe you could place 3-4 30-60FPS cheapish CMOS cams around the edge of the screen and stagger their frame captures? You'd get different angles (better for detecting eye vectors) and increase the sampling rate.
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by cgreerrun 4y ago
Looks like mice poll at around 125Hz. High bar.
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by cgreerrun 4y ago
I've been trying to flit my eyes around the screen to get a sense for how fast you'd need to track. Definitely seems pretty fast! At least sample 30Hz I'd bet. I could see how doing all the image processing that quick might b
26.
by cgreerrun 4y ago
I wonder why it's a hard problem? I'm sure it is, but it would be interesting to know the key issues if anyone here has experience with it. It seems like w/ an image sensor you can track eye vectors and head location relative
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by cgreerrun 4y ago
I wish eye-tracking hardware worked better. I feel like if it did it would be the ultimate "mouse". I've seen a few products but, IIRC, the reviews all conclude that the tech isn't there yet.
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by cgreerrun 4y ago
Stereo Reconstruction It's the algorithm(s) for how to compute a depth map when you have images from two cameras spaced some distance apart (for e.g., our eyes). It's gotten really good recently and it's fascinating on a tech
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by cgreerrun 4y ago
Will it reduce the water available? I'm not sure either way. I've been imagining it like you're sucking the evaporated water out of the top of a half-full glass of covered water. The evaporated water is in equilibrium with th
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by cgreerrun 4y ago
I'm not aware of a consumer product. The authors of the paper started this company: https://www.infinite-cooling.com/ . It looks like it's targeting industrial processes (cooling towers) where the collection effici

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