Cheat sheet

All of the LeRobot commands in one place. If you forgot how to use a specific command or want to learn about a new one you can do it here.

For all of the commands listed below remember to change the ports/names/ids to your own values!

Another great way to look at all the commands and get them configured for your specific setup is to use this Jupyter Notebook.

Setup and installation

For installation please look at LeRobot Installation.

Useful tools

Find port

Use this to identify which serial ports your robots are connected to. Follow the instructions in your terminal: you will be asked to unplug the USB cable and press Enter. The script will then detect and print the correct serial port for that robot.

lerobot-find-port

Find cameras

Quickly find camera indices and verify their output. This command prints camera information to the terminal and saves test frames from each detected camera to lerobot/outputs/captured_images

lerobot-find-cameras

Calibration

In most cases you will need to perform calibration just once for each robot and teleoperation device. Before performing the calibration make sure that all the joints are roughly in the middle position.

lerobot-calibrate \
    --robot.type=so101_follower \
    --robot.port=/dev/ttyACM0 \
    --robot.id=my_follower_arm

Make sure that you use the same IDs used during calibration later for the other scripts. That’s how LeRobot finds the calibration files.

Teleoperation

Teleoperating with two cameras and displaying the data with Rerun.

lerobot-teleoperate \
    --robot.type=so101_follower \
    --robot.port=/dev/ttyACM0 \
    --robot.id=my_follower_arm \
    --robot.cameras="{ top: {type: opencv, index_or_path: 1, width: 640, height: 480, fps: 30}, wrist: {type: opencv, index_or_path: 0, width: 640, height: 480, fps: 30} }" \
    --teleop.type=so101_leader \
    --teleop.port=/dev/ttyACM1 \
    --teleop.id=my_leader_arm \
    --display_data=true

Recording a dataset

The dataset is automatically uploaded to the server and saved under repo_id, make sure you are logged in to your HF account with CLI: hf auth login

You can get the token from: https://huggingface.co/settings/tokens

lerobot-record \
    --robot.type=so101_follower \
    --robot.port=/dev/ttyACM0 \
    --robot.id=my_follower_arm \
    --robot.cameras="{ top: {type: opencv, index_or_path: 1, width: 640, height: 480, fps: 30}, wrist: {type: opencv, index_or_path: 0, width: 640, height: 480, fps: 30} }" \
    --teleop.type=so101_leader \
    --teleop.port=/dev/ttyACM1 \
    --teleop.id=my_leader_arm \
    --dataset.repo_id=${HF_USER}/so101_dataset_test \
    --dataset.num_episodes=30 \
    --dataset.single_task="put the red brick in a bowl" \
    --dataset.streaming_encoding=true \
    --display_data=true

While collecting the dataset you can control the process with your keyboard: Control the data recording flow using keyboard shortcuts:

• Press Right Arrow (→): Save episode and move to the next.
• Press Left Arrow (←): Delete current episode and retry.
• Press Escape (ESC): Stop, encode videos, and upload.

Training

Depending on your hardware training the policy might take a few hours. That’s how you train simple ACT policy:

lerobot-train \
    --dataset.repo_id=${HF_USER}/so101_dataset_test \
    --policy.type=act \
    --output_dir=outputs/train/act_so101_test \
    --job_name=act_so101_test \
    --policy.device=cuda \
    --wandb.enable=true \
    --policy.repo_id=${HF_USER}/policy_test \
    --steps=20000

• Policy Types: act, diffusion, smolvla, pi05
• Devices: cuda (NVIDIA), mps (Apple Silicon), cpu

If you want to fine-tune a specific model you can provide the path to the model. In this case path is enough and type can be skipped.

lerobot-train \
    --dataset.repo_id=${HF_USER}/so101_dataset_test \
    --policy.path=username/the_policy_to_finetune \
    --policy.device=cuda \
    --policy.repo_id=${HF_USER}/policy_test \
    --output_dir=outputs/train/act_so101_test \
    --steps=20000

Inference

Inference means running the trained policy/model on a robot. For that we use lerobot-rollout. You will need to provide a path to your policy. It can be a local path or a path to Hugging Face for example “lerobot/folding_latest”. Your cameras configuration needs to match what was used when collecting the dataset. Duration is in seconds if unspecified, it will run forever.

If you are using the previous release V0.5.1 instead of lerobot-rollout you need to use lerobot-record. More information here.

lerobot-rollout \
    --strategy.type=base \
    --policy.path=${HF_USER}/my_policy \
    --robot.type=so101_follower \
    --robot.port=/dev/ttyACM1 \
    --robot.cameras="{ up: {type: opencv, index_or_path: /dev/video1, width: 640, height: 480, fps: 30}, side: {type: opencv, index_or_path: /dev/video5, width: 640, height: 480, fps: 30}}" \
    --task="Put lego brick into the transparent box" \
    --duration=60