One post per application in the playground: what it is for, the mechanism underneath, and the part that turned out to be harder than it looked. Written from the source, with the limitations left in.
A radiance field is millions of fuzzy ellipsoids. Getting them on screen at 60fps is mostly a sorting problem, and the sort is the interesting part.
Perception · 3Dsafetensors is a length, some JSON and a wall of bytes. A torch .pt is a ZIP with a pickle in it — which means writing a small pickle VM.
Language models · InterpretabilityMost of an MoE's experts are underused and several are near-duplicates. Turning that into a defensible pruning plan needs two numbers, not one.
Language models · EfficiencyNo WebGL, no matrices library, no dependencies: project, cull, shade, sort. The robot playground draws every frame the way graphics worked before GPUs.
Robotics · EmbodimentAnyone can publish probabilities. The interesting question is whether they mean anything — so this one scores itself every night and refits.
Forecasting · CalibrationPoints tell you who is good. Surplus value tells you who is *tradeable* — and the gap between those two is where a GM actually works.
Decision support · ValuationA tool-use agent is about forty lines of control flow. Everything difficult about it lives in the tools you are willing to hand it.
Language models · Agents