Maxime Ellerbach c15f6acb7e lingbot-va: increment-encoded action KV memory under relative actions
LingBot-VA's action stream doubles as its memory: _compute_kv_cache feeds the
previous chunk's predicted actions back as clean context. With
use_relative_actions each chunk is anchored on the state at its own start, so
the same physical motion encodes differently depending on which chunk it fell
in, and the cached stream sawtooths back to zero displacement at every boundary
(mean 0.22, p95 0.91 normalized units against a total output range of 2.0).
Training never contains such a reset -- one sample is exactly one chunk, hence
one anchor -- and the model's only cross-frame supervision is "continue from the
previous clean action frame", so it continues rather than restarting and the
postprocessor double-counts the displacement: ~7.3 deg/chunk on the folding
data, matching the observed monotonic drift after 4-5 chunks.

First-difference the conditioning instead. An increment carries no anchor, so
the cached history stays consistent across chunks; measured boundary
inconsistency drops 7.30 -> 1.78 deg, the latter being the controller's tracking
error, which is generic to chunked control rather than an artifact of the action
encoding.

The conversion touches ONLY the conditioning -- at inference in
_preprocess_action_state, and on the matching clean copy in _add_noise_stream so
training agrees. Predicted actions keep the cumulative-offset encoding, so the
processors, the checkpoint pipeline and the executed commands are untouched.
That is also what makes it safe to do here: normalization is affine with a
non-zero constant, so cumsum does not commute with unnormalization -- inverting
an accumulated stream would drift by (n-1)*(q99+q01)/2, which is 0 on a
symmetric channel but 118 deg over one chunk on right_joint_6. Nothing inverts
the conditioning, so that cannot arise.

Gated on use_relative_actions only: an absolute action stream is already
globally consistent, so those checkpoints keep their exact behaviour. A relative
checkpoint is only valid for the encoding it was trained with.

Also fixes observation_delta_indices: AutoencoderKLWan._encode consumes only the
first 4 * (iter_ - 1) + 1 frames of an n-frame clip, so asking for
frame_chunk_size * 4 decoded 3 frames per sample that never reached the encoder
(verified by ablation -- scrambling them left the latents bit-identical). Same
latent frame count, less video decode. The observation window stays shorter than
the action window, so sample validity is unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-07-31 11:22:00 +00:00
2026-07-08 07:31:10 +02:00
2025-06-05 17:48:43 +02:00
2026-04-06 12:23:37 +02:00
2026-02-28 14:41:28 +01:00
2024-03-25 12:28:07 +01:00
2026-01-16 14:38:42 +01:00

LeRobot, Hugging Face Robotics Library

Tests Tests Python versions License Status Version Contributor Covenant Discord

LeRobot aims to provide models, datasets, and tools for real-world robotics in PyTorch. The goal is to lower the barrier to entry so that everyone can contribute to and benefit from shared datasets and pretrained models.

🤗 A hardware-agnostic, Python-native interface that standardizes control across diverse platforms, from low-cost arms (SO-100) to humanoids.

🤗 A standardized, scalable LeRobotDataset format (Parquet + MP4 or images) hosted on the Hugging Face Hub, enabling efficient storage, streaming and visualization of massive robotic datasets.

🤗 State-of-the-art policies that have been shown to transfer to the real-world ready for training and deployment.

🤗 Comprehensive support for the open-source ecosystem to democratize physical AI.

Quick Start

LeRobot can be installed directly from PyPI.

pip install lerobot
lerobot-info

Important

For detailed installation guide, please see the Installation Documentation.

Robots & Control

Reachy 2 Demo

LeRobot provides a unified Robot class interface that decouples control logic from hardware specifics. It supports a wide range of robots and teleoperation devices.

from lerobot.robots.myrobot import MyRobot

# Connect to a robot
robot = MyRobot(config=...)
robot.connect()

# Read observation and send action
obs = robot.get_observation()
action = model.select_action(obs)
robot.send_action(action)

Supported Hardware: SO100, LeKiwi, Koch, HopeJR, OMX, EarthRover, Reachy2, Gamepads, Keyboards, Phones, OpenARM, Unitree G1, reBot B601.

While these devices are natively integrated into the LeRobot codebase, the library is designed to be extensible. You can easily implement the Robot interface to utilize LeRobot's data collection, training, and visualization tools for your own custom robot.

For detailed hardware setup guides, see the Hardware Documentation.

LeRobot Dataset

To solve the data fragmentation problem in robotics, we utilize the LeRobotDataset format.

  • Structure: Synchronized MP4 videos (or images) for vision and Parquet files for state/action data.
  • HF Hub Integration: Explore thousands of robotics datasets on the Hugging Face Hub.
  • Tools: Seamlessly delete episodes, split by indices/fractions, add/remove features, and merge multiple datasets.
from lerobot.datasets.lerobot_dataset import LeRobotDataset

# Load a dataset from the Hub
dataset = LeRobotDataset("lerobot/aloha_mobile_cabinet")

# Access data (automatically handles video decoding)
episode_index=0
print(f"{dataset[episode_index]['action'].shape=}\n")

Learn more about it in the LeRobotDataset Documentation

SoTA Models

LeRobot implements state-of-the-art policies in pure PyTorch, covering Imitation Learning, Reinforcement Learning, Vision-Language-Action (VLA) models, World Models, and Reward Models, with more coming soon. It also provides you with the tools to instrument and inspect your training process.

Gr00t Architecture

Training a policy is as simple as running a script configuration:

lerobot-train \
  --policy.type=act \
  --dataset.repo_id=lerobot/aloha_mobile_cabinet
Category Models
Imitation Learning ACT, Diffusion, VQ-BeT, Multitask DiT Policy
Reinforcement Learning HIL-SERL, TDMPC & QC-FQL (coming soon)
VLAs Models Pi0, Pi0Fast, Pi0.5, GR00T N1.7, SmolVLA, XVLA, EO-1, MolmoAct2, WALL-OSS, EVO1
World Models VLA-JEPA, LingBot-VA, FastWAM
Reward Models SARM, TOPReward, Robometer

Similarly to the hardware, you can easily implement your own policy & leverage LeRobot's data collection, training, and visualization tools, and share your model to the HF Hub

For detailed policy setup guides, see the Policy Documentation. For GPU/RAM requirements and expected training time per policy, see the Compute Hardware Guide.

Inference & Evaluation

Evaluate your policies in simulation or on real hardware using the unified evaluation script. LeRobot supports standard benchmarks like LIBERO, MetaWorld and more to come.

# Evaluate a policy on the LIBERO benchmark
lerobot-eval \
  --policy.path=lerobot/pi0_libero_finetuned \
  --env.type=libero \
  --env.task=libero_object \
  --eval.n_episodes=10

Learn how to implement your own simulation environment or benchmark and distribute it from the HF Hub by following the EnvHub Documentation

Resources

  • Documentation: The complete guide to tutorials & API.
  • Chinese Tutorials: LeRobot+SO-ARM101中文教程-同济子豪兄 Detailed doc for assembling, teleoperate, dataset, train, deploy. Verified by Seed Studio and 5 global hackathon players.
  • Discord: Join the LeRobot server to discuss with the community.
  • X: Follow us on X to stay up-to-date with the latest developments.
  • Robot Learning Tutorial: A free, hands-on course to learn robot learning using LeRobot.
  • T-Shirt Folding Experiment: An end-to-end demonstration of folding t-shirts with LeRobot.
  • LeLab: A web interface for LeRobot — teleoperate, calibrate, record datasets, replay, and train your SO arm from the browser, no CLI required.

Citation

If you use LeRobot in your project, please cite the GitHub repository to acknowledge the ongoing development and contributors:

@misc{cadene2024lerobot,
    author = {Cadene, Remi and Alibert, Simon and Soare, Alexander and Gallouedec, Quentin and Zouitine, Adil and Palma, Steven and Kooijmans, Pepijn and Aractingi, Michel and Shukor, Mustafa and Aubakirova, Dana and Russi, Martino and Capuano, Francesco and Pascal, Caroline and Choghari, Jade and Meftah, Khalil and Ellerbach, Maxime and Moss, Jess and Wolf, Thomas},
    title = {LeRobot: State-of-the-art Machine Learning for Real-World Robotics in Pytorch},
    howpublished = "\url{https://github.com/huggingface/lerobot}",
    year = {2024}
}

If you are referencing our research or the academic paper, please also cite our ICLR publication:

ICLR 2026 Paper
@inproceedings{cadenelerobot,
  title={LeRobot: An Open-Source Library for End-to-End Robot Learning},
  author={Cadene, Remi and Alibert, Simon and Capuano, Francesco and Aractingi, Michel and Zouitine, Adil and Kooijmans, Pepijn and Choghari, Jade and Russi, Martino and Pascal, Caroline and Palma, Steven and Shukor, Mustafa and Moss, Jess and Soare, Alexander and Aubakirova, Dana and Lhoest, Quentin and Gallou\'edec, Quentin and Wolf, Thomas},
  booktitle={The Fourteenth International Conference on Learning Representations},
  year={2026},
  url={https://arxiv.org/abs/2602.22818}
}

Contribute

We welcome contributions from everyone in the community! To get started, please read our CONTRIBUTING.md guide. Whether you're adding a new feature, improving documentation, or fixing a bug, your help and feedback are invaluable. We're incredibly excited about the future of open-source robotics and can't wait to work with you on what's next—thank you for your support!

SO101 Video

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