Topic hub
Physical AI & Robotics
Robot training data, teleoperation and egocentric collection, dataset formats, simulation, and policy training for machines that act in the world.
All posts · 16
PHYSICAL AI & ROBOTICS01
Which Robot Policy Checkpoint to Deploy After TrainingSelecting on validation loss cost 57.0 to 100.0 percent of the best checkpoint's success rate across eight measured cells. What to rank on instead.
PHYSICAL AI & ROBOTICS02
Running LeRobot Offline: Which Commands Call Hugging FaceLeRobot v0.6.1 records with push_to_hub=True and uploads from a finally block. Three of five rollout strategies upload even with that flag off.
PHYSICAL AI & ROBOTICS03
Sim to Real Gap: Why a Robot Policy Fails on HardwareA zero delay, infinite bandwidth actuator is what you simulate by default, and it was measured at 3.55 Nm of torque error. Four causes, four measurements.
PHYSICAL AI & ROBOTICS04
LeRobot v2.0 to v3.0 Dataset Conversion Takes Two ReleasesA v2.0 LeRobot corpus needs two releases to reach v3.0: 0.3.3 for the first rung, 0.6.1 for the second. The first rung cannot run offline as shipped.
PHYSICAL AI & ROBOTICS05
LeRobot Dataset Merge: What Breaks and How to CheckThe documented merge command raises before it opens a file, and a merged q01/q99 has never been a real quantile at any LeRobot version. Check yours in one pass.
PHYSICAL AI & ROBOTICS06
Removing Episodes From a LeRobot Dataset: Which to CutLeRobot v0.6.1 deletes episodes in one command. Deciding which to cut is the harder half: four proxy criteria, one real label, and a written bar.
PHYSICAL AI & ROBOTICS07
Isaac Lab vs MuJoCo vs Genesis for Robot Training DataOne MuJoCo point release moved a LIBERO task from 98% to 12% success on an unchanged checkpoint. How to choose a simulator and pin its physics.
PHYSICAL AI & ROBOTICS08
Open X-Embodiment Dataset License: No Single Answer1,876 of the 2,000 most-downloaded LeRobot datasets read apache-2.0. That tag is a Python default argument, not a licence anyone declared.
PHYSICAL AI & ROBOTICS09
Joint Space vs Task Space: Which Robot Action Space to Use13,000 real rollouts put the delta anchor ahead of the joint versus task choice, and DROID ships eight action columns in one episode.