gijs

We scaled off-policy RL to sim-to-real. To our knowledge, FlashSAC is the fastest and most performant RL algorithm across IsaacLab, MuJoCo Playground, and many more, all with a single set of hyperparameters. Project page: holiday-robot.github.io/FlashSAC Paper: arxiv.org/pdf/2604.04539

@ErenChenAI @kevin_zakka Yea I’ve seen it! I’m close to a similar one on the k1! playing around with this paper arxiv.org/pdf/2603.15789

@_gijsdj @kevin_zakka Kevin did the zombie get up in real. Check his previous tweets

Ported over the getup tasks from playground to mjlab for my thesis defense. Will make them available in a separate repo so others can repro and build on top in the coming weeks.

@kevin_zakka i implemented a getup env for the K1 a while back, perhaps I should add a power term as well. this is only with a curriculum on the action rate penalty

@_gijsdj there’s a pretty aggressive power curriculum, should be soft actually

@jloganolson super cool! those eyes are awesome 🤣

Short clip from the first playtest yesterday - lots of room for improvement but always exciting when the prototype is finally stood up end-to-end.

Introducing OpenCrane, an open-source crane for humanoid robots. 200 cm tall, 180 cm span, built from 6063-T5 aluminium extrusions. It's easy to mount anything onto the frame without drilling. Repo: github.com/asimovinc/open…

@asimovinc i love this, gonna build this whenever i get my hands on the parts!

this is so cute

@kevin_zakka so nice!

Another viser banger coming to mjlab. Scrub through the reference motion in the play script to find a desired "start" index. Nifty use of the debug ghost :)

soma retargeting for the booster k1!

sharing our new project Smash!🏓 We built the first outdoor humanoid table tennis player with fully onboard perception — no MoCap, no external cameras. check the video for details. paper and code on the way!

@Sentdex awesome! i was working on something similar for the K1. Will open a PR!

Introducing KimoLab: Kimodo + mjlab for prompt to physics-based motion matching for the unitree g1. I accidentally had claude make this and it's actually pretty cool.

It’s fun to watch these Didi’s autonomous delivery vehicles zoom off after the light turns green #didi

@TheDonOfDAA custom tool built with @rerundotio for viz

@_gijsdj what app are you running for intrinsics?

something weirdly humbling about all this progress and it still starts with a checkerboard

@0fir0z yup!

@_gijsdj Is it's mouth basically in it's ears?

@sincethestudy curious what your approach is for intrinsics?

@_gijsdj This is old technology, come to Bracket Bot to see how sensor calibration in 2026 should actually be.

Will release something interesting in the coming months.