State-of-the-art Machine Learning for real-world robotics

---

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

🤗 LeRobot contains state-of-the-art approaches that have been shown to transfer to the real-world with a focus on imitation learning and reinforcement learning.

🤗 LeRobot already provides a set of pretrained models, datasets with human collected demonstrations, and simulation environments to get started without assembling a robot. In the coming weeks, the plan is to add more and more support for real-world robotics on the most affordable and capable robots out there.

🤗 LeRobot hosts pretrained models and datasets on this Hugging Face community page: huggingface.co/lerobot

Examples of pretrained models on simulation environments

ACT policy on ALOHA env	TDMPC policy on SimXArm env	Diffusion policy on PushT env

Acknowledgment

• Thanks to Tony Zaho, Zipeng Fu and colleagues for open sourcing ACT policy, ALOHA environments and datasets. Ours are adapted from ALOHA and Mobile ALOHA.
• Thanks to Cheng Chi, Zhenjia Xu and colleagues for open sourcing Diffusion policy, Pusht environment and datasets, as well as UMI datasets. Ours are adapted from Diffusion Policy and UMI Gripper.
• Thanks to Nicklas Hansen, Yunhai Feng and colleagues for open sourcing TDMPC policy, Simxarm environments and datasets. Ours are adapted from TDMPC and FOWM.
• Thanks to Vincent Moens and colleagues for open sourcing TorchRL. It allowed for quick experimentations on the design of LeRobot.
• Thanks to Antonio Loquercio and Ashish Kumar for their early support.

Installation

Download our source code:

git clone https://github.com/huggingface/lerobot.git && cd lerobot

Create a virtual environment with Python 3.10 and activate it, e.g. with miniconda:

conda create -y -n lerobot python=3.10 && conda activate lerobot

Install 🤗 LeRobot:

pip install .

For simulations, 🤗 LeRobot comes with gymnasium environments that can be installed as extras:

• aloha
• xarm
• pusht

For instance, to install 🤗 LeRobot with aloha and pusht, use:

pip install ".[aloha, pusht]"

To use Weights and Biases for experiment tracking, log in with

wandb login

Walkthrough

.
├── examples             # contains demonstration examples, start here to learn about LeRobot
├── lerobot
|   ├── configs          # contains hydra yaml files with all options that you can override in the command line
|   |   ├── default.yaml   # selected by default, it loads pusht environment and diffusion policy
|   |   ├── env            # various sim environments and their datasets: aloha.yaml, pusht.yaml, xarm.yaml
|   |   └── policy         # various policies: act.yaml, diffusion.yaml, tdmpc.yaml
|   ├── common           # contains classes and utilities
|   |   ├── datasets       # various datasets of human demonstrations: aloha, pusht, xarm
|   |   ├── envs           # various sim environments: aloha, pusht, xarm
|   |   ├── policies       # various policies: act, diffusion, tdmpc
|   |   └── utils          # various utilities
|   └── scripts          # contains functions to execute via command line
|       ├── eval.py                 # load policy and evaluate it on an environment
|       ├── train.py                # train a policy via imitation learning and/or reinforcement learning
|       ├── push_dataset_to_hub.py  # convert your dataset into LeRobot dataset format and upload it to the Hugging Face hub
|       └── visualize_dataset.py    # load a dataset and render its demonstrations
├── outputs               # contains results of scripts execution: logs, videos, model checkpoints
└── tests                 # contains pytest utilities for continuous integration

Visualize datasets

Check out example 1 that illustrates how to use our dataset class which automatically download data from the Hugging Face hub.

You can also locally visualize episodes from a dataset by executing our script from the command line:

python lerobot/scripts/visualize_dataset.py \
    --repo-id lerobot/pusht \
    --episode-index 0

It will open rerun.io and display the camera streams, robot states and actions, like this:

battery-720p.mov

Our script can also visualize datasets stored on a distant server. See python lerobot/scripts/visualize_dataset.py --help for more instructions.

Evaluate a pretrained policy

Check out example 2 that illustrates how to download a pretrained policy from Hugging Face hub, and run an evaluation on its corresponding environment.

We also provide a more capable script to parallelize the evaluation over multiple environments during the same rollout. Here is an example with a pretrained model hosted on lerobot/diffusion_pusht:

python lerobot/scripts/eval.py \
    -p lerobot/diffusion_pusht \
    eval.n_episodes=10 \
    eval.batch_size=10

Note: After training your own policy, you can re-evaluate the checkpoints with:

python lerobot/scripts/eval.py \
    -p PATH/TO/TRAIN/OUTPUT/FOLDER

See python lerobot/scripts/eval.py --help for more instructions.

Train your own policy

Check out example 3 that illustrates how to start training a model.

In general, you can use our training script to easily train any policy. To use wandb for logging training and evaluation curves, make sure you ran wandb login. Here is an example of training the ACT policy on trajectories collected by humans on the Aloha simulation environment for the insertion task:

python lerobot/scripts/train.py \
    policy=act \
    env=aloha \
    env.task=AlohaInsertion-v0 \
    dataset_repo_id=lerobot/aloha_sim_insertion_human

The experiment directory is automatically generated and will show up in yellow in your terminal. It looks like outputs/train/2024-05-05/20-21-12_aloha_act_default. You can manually specify an experiment directory by adding this argument to the train.py python command:

    hydra.run.dir=your/new/experiment/dir

A link to the wandb logs for the run will also show up in yellow in your terminal. Here is an example of logs from wandb:

You can deactivate wandb by adding these arguments to the train.py python command:

    wandb.disable_artifact=true \
    wandb.enable=false

Note: For efficiency, during training every checkpoint is evaluated on a low number of episodes. After training, you may want to re-evaluate your best checkpoints on more episodes or change the evaluation settings. See python lerobot/scripts/eval.py --help for more instructions.

Contribute

If you would like to contribute to 🤗 LeRobot, please check out our contribution guide.

Add a new dataset

To add a dataset to the hub, you need to login using a write-access token, which can be generated from the Hugging Face settings:

huggingface-cli login --token ${HUGGINGFACE_TOKEN} --add-to-git-credential

Then move your dataset folder in data directory (e.g. data/aloha_ping_pong), and push your dataset to the hub with:

python lerobot/scripts/push_dataset_to_hub.py \
--data-dir data \
--dataset-id aloha_ping_ping \
--raw-format aloha_hdf5 \
--community-id lerobot

See python lerobot/scripts/push_dataset_to_hub.py --help for more instructions.

If your dataset format is not supported, implement your own in lerobot/common/datasets/push_dataset_to_hub/${raw_format}_format.py by copying examples like pusht_zarr, umi_zarr, aloha_hdf5, or xarm_pkl.

Add a pretrained policy

Once you have trained a policy you may upload it to the Hugging Face hub using a hub id that looks like ${hf_user}/${repo_name} (e.g. lerobot/diffusion_pusht).

You first need to find the checkpoint located inside your experiment directory (e.g. outputs/train/2024-05-05/20-21-12_aloha_act_default/checkpoints/002500). It should contain:

• config.json: A serialized version of the policy configuration (following the policy's dataclass config).
• model.safetensors: A set of torch.nn.Module parameters, saved in Hugging Face Safetensors format.
• config.yaml: A consolidated Hydra training configuration containing the policy, environment, and dataset configs. The policy configuration should match config.json exactly. The environment config is useful for anyone who wants to evaluate your policy. The dataset config just serves as a paper trail for reproducibility.

To upload these to the hub, run the following:

huggingface-cli upload ${hf_user}/${repo_name} path/to/checkpoint/dir

See eval.py for an example of how other people may use your policy.

Improve your code with profiling

An example of a code snippet to profile the evaluation of a policy:

from torch.profiler import profile, record_function, ProfilerActivity

def trace_handler(prof):
    prof.export_chrome_trace(f"tmp/trace_schedule_{prof.step_num}.json")

with profile(
    activities=[ProfilerActivity.CPU, ProfilerActivity.CUDA],
    schedule=torch.profiler.schedule(
        wait=2,
        warmup=2,
        active=3,
    ),
    on_trace_ready=trace_handler
) as prof:
    with record_function("eval_policy"):
        for i in range(num_episodes):
            prof.step()
            # insert code to profile, potentially whole body of eval_policy function

Citation

If you want, you can cite this work with:

@misc{cadene2024lerobot,
    author = {Cadene, Remi and Alibert, Simon and Soare, Alexander and Gallouedec, Quentin and Zouitine, Adil 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}
}