Viewing profile — cgreerrun

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Short explainer for how the control of the SO-100 robot works.

Highly recommend LeRobot.

> 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 …

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 …

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…

You're welcome! I highly recommend the CPU/microchip one too.

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. B…

This video is a great explainer too: How do Graphics Cards Work? Exploring GPU Architecture ( https://youtu.be/h9Z4oGN89MU?si=EPPO0kny-gN0zLeC )

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. Godspe…

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/2309.171…

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 di…

Academics should write readable papers

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/returnin…

> 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 …

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 …

> 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…

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…

Ah, interesting! So you can ensure you get illumination on the eyes w/out shining annoying, visible light at them. Very cool.

(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…

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) …

Looks like mice poll at around 125Hz. High bar.

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 doin…