This project integrates Unreal Engine with OpenAI Gym for visual reinforcement learning based on UnrealCV. In this project, you can run (Multi-Agent) Reinforcement Learning algorithms in various realistic UE4 environments easily without any knowledge of Unreal Engine and UnrealCV.

A number of environments have been released for robotic vision tasks, including Active object tracking, Searching for objects, and Robot arm control.

Tracking in UrbanCity with distractors	Tracking in Garden	Tracking in SnowForest
Tracking in Garage with distractors	Searching in RealisticRoom	Robot Arm Control

The framework of this project is shown below:

• UnrealCV is the basic bridge between Unreal Engine and OpenAI Gym.
• OpenAI Gym is a toolkit for developing an RL algorithm, compatible with most numerical computation libraries, such as TensorFlow or PyTorch.

• UnrealCV
• Gym
• CV2
• Matplotlib
• Numpy
• Docker(Optional)
• Nvidia-Docker(Optional)

We recommend you use anaconda to install and manage your Python environment. CV2 is used for image processing, like extracting object masks and bounding boxes. Matplotlib is used for visualization.

It is easy to install gym-unrealcv, just run

git clone https://github.com/zfw1226/gym-unrealcv.git
cd gym-unrealcv
pip install -e . 

While installing gym-unrealcv, dependencies including OpenAI Gym, unrealcv, numpy and matplotlib are installed. Opencv should be installed additionally. If you use anaconda, you can run

conda update conda
conda install --channel menpo opencv

or

pip install opencv-python

Before running the environments, you need to prepare unreal binaries. You can load them from clouds by running load_env.py

python load_env.py -e {ENV_NAME}

ENV_NAME can be RealisticRoom, RandomRoom, Arm, etc. After that, it will automatically download a related env binary to the UnrealEnv directory.

Please refer the binary_list in load_env.py for more available example environments.

Once gym-unrealcv is installed successfully, you will see that your agent is walking randomly in first-person view to find a door, after you run:

cd example/random
python random_agent.py -e UnrealSearch-RealisticRoomDoor-DiscreteColor-v0

After that, if all goes well， a pre-defined gym environment UnrealSearch-RealisticRoomDoor-DiscreteColor-v0 will be launched. And then you will see that your agent is moving around the room randomly.

We list the pre-defined environments in this page, for object searching and active object tracking.

To demonstrate how to train an agent in gym-unrealcv, we provide DQN (Keras) and DDPG (Keras) codes in .example.

Moreover, you can also refer to some recent projects for more advanced usages, as follows:

• craves_control provides an example for learning to control a robot arm via DDPG (PyTorch).
• active_tracking_rl provides examples for learning active visual tracking via A3C (Pytorch). The training framework can be used for single-agent RL, adversarial RL, and multi-agent games.
• pose-assisted-collaboration provides an example for learning multi-agent collaboration via A3C (Pytorch) in multiple PTZ cameras single target environments.

We provide a set of tutorials to help you get started with Gym-UnrealCV.

You can follow the modify_env_tutorial to modify the configuration of the pre-defined environment.

You can follow the add_new_env_tutorial to add a new unreal environment for your RL task.

🎉 Please feel free to pull requests or open an issue to add papers.

• Towards Active Vision for Action Localization With Reactive Control and Predictive Learning, WACV 2022.
• Coordinate-aligned multi-camera collaboration for active multi-object tracking, Arxiv 2022.
• Towards distraction-robust active visual tracking, ICML 2021.
• AD-VAT+: An Asymmetric Dueling Mechanism for Learning and Understanding Visual Active Tracking, TPAMI 2021.
• Training an Agent to Find and Reach an Object in Different Environments using Visual Reinforcement Learning and Transfer Learning, ICAART 2021.
• Pose-Assisted Multi-Camera Collaboration for Active Object Tracking, AAAI 2020.
• Craves: Controlling robotic arm with a vision-based economic system, CVPR 2019.
• End-to-end active object tracking and its real-world deployment via reinforcement learning, TPAMI 2019.
• An Improved Method Based on Deep Reinforcement Learning for Target Searching, ICRAE 2019.
• AD-VAT: An Asymmetric Dueling mechanism for learning Visual Active Tracking, ICLR 2019.
• End-to-end active object tracking via reinforcement learning, ICML 2018.

If you use Gym-UnrealCV in your academic research, we would be grateful if you could cite it as follow:

@misc{gymunrealcv2017,
    author = {Fangwei Zhong, Weichao Qiu, Tingyun Yan, Alan Yuille, Yizhou Wang},
    title = {Gym-UnrealCV: Realistic virtual worlds for visual reinforcement learning},
    howpublished={Web Page},
    url = {https://github.com/unrealcv/gym-unrealcv},
    year = {2017}
}

If you have any suggestions or are interested in using Gym-UnrealCV, get in touch at zfw1226 [at] gmail [dot] com.