pytorch-a2c-ppo-acktr

A PyTorch implementation of PPO for use with the pretrained models provided in Assistive Gym.
This library includes scripts for training and evluating multi agent policies using co-optimization; specifically, train_coop.py and enjoy_coop.py.

Installation and pretrained models

This library and the pretrained policies for Assistive Gym can be downloaded using the following commands.
If you do not have wget installed on your machine, you can download the models directly from the Assistive Gym GitHub release page.

# Install PyTorch RL library
pip3 install git+https://github.com/Zackory/pytorch-a2c-ppo-acktr --no-cache-dir
# Install OpenAI Baselines
pip3 install git+https://github.com/openai/baselines.git
# Download pretrained policies
cd assistive-gym
wget -O trained_models/ppo/pretrained_policies.zip https://github.com/Healthcare-Robotics/assistive-gym/releases/download/0.100/pretrained_policies.zip
unzip trained_models/ppo/pretrained_policies.zip -d trained_models/ppo

If you receive an error during installation due to MPI (mpi4py), you may need to install the missing MPI package. On Linux, this can be resolved with:

sudo apt install libopenmpi-dev

or on Mac with:

brew install mpich

Examples

Refer to Assistive Gym for more detailed use cases of this reinforcement learning library.

Training - Static human

python3 -m ppo.train --env-name "ScratchItchJaco-v1" --num-env-steps 10000000

We suggest using nohup to train policies in the background, disconnected from the terminal instance.

nohup python3 -m ppo.train --env-name "ScratchItchJaco-v1" --num-env-steps 10000000 --save-dir ./trained_models/ > nohup.out &

See arguments.py for a full list of available arguments and hyperparameters.

Training - Co-optimization, active human and robot

python3 -m ppo.train_coop --env-name "FeedingSawyerHuman-v1" --num-env-steps 10000000

Resume training from an existing policy

python3 -m ppo.train --env-name "FeedingSawyer-v1" --num-env-steps 2000000 --save-dir ./trained_models_new/ --load-policy ./trained_models/ppo/FeedingSawyer-v1.pt

Visual Evaluation - Static human

python3 -m ppo.enjoy --env-name "ScratchItchJaco-v1"

Visual Evaluation - Co-optimization, active human and robot

python3 -m ppo.enjoy_coop --env-name "FeedingSawyerHuman-v1"

Quantitative Evaluation over 100 trails - Static human

python3 -m ppo.enjoy_100trials --env-name "ScratchItchJaco-v1"

Quantitative Evaluation over 100 trails - Active human from co-optimization

python3 -m ppo.enjoy_coop_100trials --env-name "FeedingSawyerHuman-v1"

pytorch-a2c-ppo-acktr-gail

This library is derived from code by Ilya Kostrikov: https://github.com/ikostrikov/pytorch-a2c-ppo-acktr-gail

Please use this bibtex if you want to cite this repository in your publications:

@misc{pytorchrl,
  author = {Kostrikov, Ilya},
  title = {PyTorch Implementations of Reinforcement Learning Algorithms},
  year = {2018},
  publisher = {GitHub},
  journal = {GitHub repository},
  howpublished = {\url{https://github.com/ikostrikov/pytorch-a2c-ppo-acktr-gail}},
}

Requirements

• Python 3
• PyTorch
• OpenAI baselines