Imitation learning with ROS 2

Object picking with imitation learning	Object picking when pose of object is randomized

The RoboImitate project supports imitation learning through a Diffusion Policy. This policy learns behavior using expert demonstrations. (Stay tuned for our upcoming YouTube presentation for more details!)

This repository allows you to:

• Collect demonstrations in both real and simulated environments. Learn more here.
• Train and evaluate a Diffusion Policy model. Learn more here.
• Support the Lite 6 robot arm. Learn more here.

Important

You need to have Docker installed. If you have an Nvidia GPU, you need to additionally follow this guide. Additionally, you need to istall Isaac-Sim If you want to use simulation.

Install docker

sudo apt install git make curl
curl -sSL https://get.docker.com | sh && sudo usermod -aG docker $USER

Installation

• Download our source code:

git clone https://github.com/MarijaGolubovic/robo_imitate.git && cd robo_imitate/docker

• Build docker container

make build-pc run exec

• Build ROS 2 packages

colcon build --symlink-install && source ./install/local_setup.bash

Model evaluation

Note

You can download pretrain model and aditional files from this link. Downloaded model and files you need to put inside folder imitation/outputs/train. If folder don't exist you need to create it.

• Run Isaac-Sim or Lite 6 robot arm

Inside docker container run:

• Run ROS 2 controler

ros2 launch xarm_bringup lite6_cartesian_launch.py rviz:=false sim:=true

If you want to vizualize robot set rviz on true. If you want to use real enviroment set sim on false.

• Open another terminal and run docker

make exec

• Run model inside docker

 cd src/robo_imitate && ./imitation/pick_screwdriver --sim

If you run in real environment you need to remove --sim from command.

Model training

Inside robo_imitate directory run follow commands:

docker build --build-arg UID=$(id -u) -t imitation .

docker run -v $(pwd)/imitation/:/docker/app/imitation:Z --gpus all -it -e DATA_PATH=imitation/data/sim_env_data.parquet -e EPOCH=1000 imitation

Tip

If you want to run model training inside docker, run this command inside the folder src/robo_imitate. Before that, you need to build the docker (see the Installation section for details).

python3 ./imitation/compute_stats --path imitation/data/sim_env_data.parquet  && python3 ./imitation/train_script --path imitation/data/sim_env_data.parquet  --epoch 1000

Acknowledgment

• Thanks to LeRobot team for open sourcing LeRobot projects.
• Thanks to Cheng Chi, Zhenjia Xu and colleagues for open sourcing Diffusion policy