Reinforcement learning playground

Currently repository allows to play with cart pole model.

Cart pole simulation

Model of the cart pole

The model of the cart pole was initially created and analyzed in publication:

• K. Arent, M. Szulc, "Experimental stand with a pendulum on a cart: construction, modelling, identification, model based control and deployment"

    @chapter {ARENT2018
        title = "Experimental stand with a pendulum on a cart: construction, modelling, identification, model based control and deployment"
        authors = "KRZYSZTOF ARENT and Mateusz Szulc"
        booktitle = "Postępy robotyki"
        year = "2018"
        pages = "365-376"
    }
  

The cart pole is located in The Laboratory of Robotics on Wrocaław University of Science and Technology.

Run simulation

Open folder in a devcontainer. Then type

colcon build --symlink-install
source install/setup.bash
ros2 launch cart_pole_bringup cart_pole.launch.py

Linear approximation in an unstable equilibrium point

A model of an inverted pendulum on a cart and controller are derived in the cart_pole_system.ipynb.

The model was applied to control the cart pole in the script linear_approximation_control_node.py.

source install/setup.bash
ros2 run cart_pole_model_based_controller linear_approximation_control_node

Reinforcement learning nodes

Repository currently contains three reinforcement learning policies:

• Basic policy
• Neural network policy
• Deep q learning policy

All implementations are based on the implementations presented in the Hands-On Machine Learning with Scikit-Learn, Keras, and Tensorflow: Concepts, Tools, and Techniques to Build Intelligent

Launching

To run simulations use command given above and in other terminal use one of following command:

source install/setup.bash
ros2 run cart_pole_reinforcement_learning cart_pole_basic_policy_node

or

source install/setup.bash
ros2 run cart_pole_reinforcement_learning cart_pole_neural_network_policy

or

source install/setup.bash
ros2 run cart_pole_reinforcement_learning cart_pole_deep_q_learning_policy_node

DQN model works poorly for now.