RL Games: High performance RL library

Discord Channel Link

• https://discord.gg/hnYRq7DsQh

Papers and related links

• Isaac Gym: High Performance GPU-Based Physics Simulation For Robot Learning: https://arxiv.org/abs/2108.10470
• Transferring Dexterous Manipulation from GPU Simulation to a Remote Real-World TriFinger: https://s2r2-ig.github.io/ https://arxiv.org/abs/2108.09779
• Is Independent Learning All You Need in the StarCraft Multi-Agent Challenge? https://arxiv.org/abs/2011.09533
• Superfast Adversarial Motion Priors (AMP) implementation: https://twitter.com/xbpeng4/status/1506317490766303235 https://github.com/NVIDIA-Omniverse/IsaacGymEnvs
• OSCAR: Data-Driven Operational Space Control for Adaptive and Robust Robot Manipulation: https://cremebrule.github.io/oscar-web/ https://arxiv.org/abs/2110.00704

Some results on the different environments

• NVIDIA Isaac Gym

• Starcraft 2 Multi Agents
• BRAX
• Mujoco Envpool
• Atari Envpool
• Random Envs

Implemented in Pytorch:

• PPO with the support of asymmetric actor-critic variant
• Support of end-to-end GPU accelerated training pipeline with Isaac Gym and Brax
• Masked actions support
• Multi-agent training, decentralized and centralized critic variants
• Self-play

Implemented in Tensorflow 1.x (was removed in this version):

• Rainbow DQN
• A2C
• PPO

Quickstart: Colab in the Cloud

Explore RL Games quick and easily in colab notebooks:

• Mujoco training Mujoco envpool training example.
• Brax training Brax training example, with keeping all the observations and actions on GPU.

Installation

For maximum training performance a preliminary installation of Pytorch 1.9+ with CUDA 11.1+ is highly recommended:

conda install pytorch torchvision cudatoolkit=11.3 -c pytorch -c nvidia or: pip install torch==1.11.0+cu113 torchvision==0.12.0+cu113 -f https://download.pytorch.org/whl/cu113/torch_stable.html

Then:

pip install rl-games

To run CPU-based environments either Ray or envpool are required pip install envpool or pip install ray To run Mujoco, Atari games or Box2d based environments training they need to be additionally installed with pip install gym[mujoco], pip install gym[atari] or pip install gym[box2d] respectively.

To run Atari also pip install opencv-python is required. In addition installation of envpool for maximum simulation and training perfromance of Mujoco and Atari environments is highly recommended: pip install envpool

Citing

If you use rl-games in your research please use the following citation:

@misc{rl-games2022,
title = {rl-games: A High-performance Framework for Reinforcement Learning},
author = {Makoviichuk, Denys and Makoviychuk, Viktor},
month = {May},
year = {2022},
publisher = {GitHub},
journal = {GitHub repository},
howpublished = {\url{https://github.com/Denys88/rl_games}},
}

Development setup

poetry install
# install cuda related dependencies
poetry run pip install torch==1.11.0+cu113 torchvision==0.12.0+cu113 -f https://download.pytorch.org/whl/cu113/torch_stable.html

Training

NVIDIA Isaac Gym

Download and follow the installation instructions of Isaac Gym: https://developer.nvidia.com/isaac-gym
And IsaacGymEnvs: https://github.com/NVIDIA-Omniverse/IsaacGymEnvs

Ant

python train.py task=Ant headless=True python train.py task=Ant test=True checkpoint=nn/Ant.pth num_envs=100

Humanoid

python train.py task=Humanoid headless=True python train.py task=Humanoid test=True checkpoint=nn/Humanoid.pth num_envs=100

Shadow Hand block orientation task

python train.py task=ShadowHand headless=True python train.py task=ShadowHand test=True checkpoint=nn/ShadowHand.pth num_envs=100

Other

Atari Pong

poetry install -E atari
poetry run python runner.py --train --file rl_games/configs/atari/ppo_pong.yaml
poetry run python runner.py --play --file rl_games/configs/atari/ppo_pong.yaml --checkpoint nn/PongNoFrameskip.pth

Brax Ant

poetry install -E brax
poetry run pip install --upgrade "jax[cuda]==0.3.13" -f https://storage.googleapis.com/jax-releases/jax_releases.html
poetry run python runner.py --train --file rl_games/configs/brax/ppo_ant.yaml
poetry run python runner.py --play --file rl_games/configs/brax/ppo_ant.yaml --checkpoint runs/Ant_brax/nn/Ant_brax.pth

Experiment tracking

rl_games support experiment tracking with Weights and Biases.

poetry install -E atari
poetry run python runner.py --train --file rl_games/configs/atari/ppo_breakout_torch.yaml --track
WANDB_API_KEY=xxxx poetry run python runner.py --train --file rl_games/configs/atari/ppo_breakout_torch.yaml --track
poetry run python runner.py --train --file rl_games/configs/atari/ppo_breakout_torch.yaml --wandb-project-name rl-games-special-test --track
poetry run python runner.py --train --file rl_games/configs/atari/ppo_breakout_torch.yaml --wandb-project-name rl-games-special-test -wandb-entity openrlbenchmark --track

Multi GPU

We use torchrun to orchestrate any multi-gpu runs.

torchrun --standalone --nnodes=1 --nproc_per_node=2 runner.py --train --file rl_games/configs/ppo_cartpole.yaml

Config Parameters

Field	Example Value	Default	Description
seed	8	None	Seed for pytorch, numpy etc.
algo			Algorithm block.
name	a2c_continuous	None	Algorithm name. Possible values are: sac, a2c_discrete, a2c_continuous
model			Model block.
name	continuous_a2c_logstd	None	Possible values: continuous_a2c ( expects sigma to be (0, +inf), continuous_a2c_logstd ( expects sigma to be (-inf, +inf), a2c_discrete, a2c_multi_discrete
network			Network description.
name	actor_critic		Possible values: actor_critic or soft_actor_critic.
separate	False		Whether use or not separate network with same same architecture for critic. In almost all cases if you normalize value it is better to have it False
space			Network space
continuous			continuous or discrete
mu_activation	None		Activation for mu. In almost all cases None works the best, but we may try tanh.
sigma_activation	None		Activation for sigma. Will be threated as log(sigma) or sigma depending on model.
mu_init			Initializer for mu.
name	default
sigma_init			Initializer for sigma. if you are using logstd model good value is 0.
name	const_initializer
val	0
fixed_sigma	True		If true then sigma vector doesn't depend on input.
cnn			Convolution block.
type	conv2d		Type: right now two types supported: conv2d or conv1d
activation	elu		activation between conv layers.
initializer			Initialier. I took some names from the tensorflow.
name	glorot_normal_initializer		Initializer name
gain	1.4142		Additional parameter.
convs			Convolution layers. Same parameters as we have in torch.
filters	32		Number of filters.
kernel_size	8		Kernel size.
strides	4		Strides
padding	0		Padding
filters	64		Next convolution layer info.
kernel_size	4
strides	2
padding	0
filters	64
kernel_size	3
strides	1
padding	0
mlp			MLP Block. Convolution is supported too. See other config examples.
units			Array of sizes of the MLP layers, for example: [512, 256, 128]
d2rl	False		Use d2rl architecture from https://arxiv.org/abs/2010.09163.
activation	elu		Activations between dense layers.
initializer			Initializer.
name	default		Initializer name.
rnn			RNN block.
name	lstm		RNN Layer name. lstm and gru are supported.
units	256		Number of units.
layers	1		Number of layers
before_mlp	False	False	Apply rnn before mlp block or not.
config			RL Config block.
reward_shaper			Reward Shaper. Can apply simple transformations.
min_val	-1		You can apply min_val, max_val, scale and shift.
scale_value	0.1	1
normalize_advantage	True	True	Normalize Advantage.
gamma	0.995		Reward Discount
tau	0.95		Lambda for GAE. Called tau by mistake long time ago because lambda is keyword in python :(
learning_rate	3e-4		Learning rate.
name	walker		Name which will be used in tensorboard.
save_best_after	10		How many epochs to wait before start saving checkpoint with best score.
score_to_win	300		If score is >=value then this value training will stop.
grad_norm	1.5		Grad norm. Applied if truncate_grads is True. Good value is in (1.0, 10.0)
entropy_coef	0		Entropy coefficient. Good value for continuous space is 0. For discrete is 0.02
truncate_grads	True		Apply truncate grads or not. It stabilizes training.
env_name	BipedalWalker-v3		Envinronment name.
e_clip	0.2		clip parameter for ppo loss.
clip_value	False		Apply clip to the value loss. If you are using normalize_value you don't need it.
num_actors	16		Number of running actors/environments.
horizon_length	4096		Horizon length per each actor. Total number of steps will be num_actors*horizon_length * num_agents (if env is not MA num_agents==1).
minibatch_size	8192		Minibatch size. Total number number of steps must be divisible by minibatch size.
minibatch_size_per_env	8		Minibatch size per env. If specified will overwrite total number number the default minibatch size with minibatch_size_per_env * nume_envs value.
mini_epochs	4		Number of miniepochs. Good value is in [1,10]
critic_coef	2		Critic coef. by default critic_loss = critic_coef * 1/2 * MSE.
lr_schedule	adaptive	None	Scheduler type. Could be None, linear or adaptive. Adaptive is the best for continuous control tasks. Learning rate is changed changed every miniepoch
kl_threshold	0.008		KL threshould for adaptive schedule. if KL < kl_threshold/2 lr = lr * 1.5 and opposite.
normalize_input	True		Apply running mean std for input.
bounds_loss_coef	0.0		Coefficient to the auxiary loss for continuous space.
max_epochs	10000		Maximum number of epochs to run.
normalize_value	True		Use value running mean std normalization.
use_diagnostics	True		Adds more information into the tensorboard.
value_bootstrap	True		Bootstraping value when episode is finished. Very useful for different locomotion envs.
bound_loss_type	'regularisation'	None	Adds aux loss for continuous case. 'regularisation' is the sum of sqaured actions. 'bound' is the sam of actions higher than 1.1.
bounds_loss_coef	0.0005	0	Regularisation coefficient
use_smooth_clamp	False		Use smooth clamp instead of regular for cliping
player			Player configuration block.
render	True	False	Render environment
determenistic	True	True	Use deterministic policy ( argmax or mu) or stochastic.
games_num	200		Number of games to run in the player mode.
env_config			Env configuration block. It goes directly to the environment. This example was take for my atari wrapper.
skip	4		Number of frames to skip
name	'BreakoutNoFrameskip-v4'		Name of exact atari env. Of course depending on your env this parameters may be different.

Custom network example:

simple test network
This network takes dictionary observation. To register it you can add code in your init.py

from rl_games.envs.test_network import TestNetBuilder 
from rl_games.algos_torch import model_builder
model_builder.register_network('testnet', TestNetBuilder)

simple test environment example environment

Additional environment supported properties and functions

Field	Default Value	Description
use_central_value	False	If true than returned obs is expected to be dict with 'obs' and 'state'
value_size	1	Shape of the returned rewards. Network wil support multihead value automatically.
concat_infos	False	Should default vecenv convert list of dicts to the dicts of lists. Very usefull if you want to use value_boostrapping. in this case you need to always return 'time_outs' : True or False, from the env.
get_number_of_agents(self)	1	Returns number of agents in the environment
has_action_mask(self)	False	Returns True if environment has invalid actions mask.
get_action_mask(self)	None	Returns action masks if has_action_mask is true. Good example is SMAC Env

Release Notes

1.5.2

• Added observation normalization to the SAC.
• Returned back adaptive KL legacy mode.

1.5.1

• Fixed build package issue.

1.5.0

• Added wandb support.
• Added poetry support.
• Fixed various bugs.
• Fixed cnn input was not divided by 255 in case of the dictionary obs.
• Added more envpool mujoco and atari training examples. Some of the results: 15 min Mujoco humanoid training, 2 min atari pong.
• Added Brax and Mujoco colab training examples.
• Added 'seed' command line parameter. Will override seed in config in case it's > 0.
• Deprecated horovod in favor of torch.distributed (#171).

1.4.0

• Added discord channel https://discord.gg/hnYRq7DsQh :)
• Added envpool support with a few atari examples. Works 3-4x time faster than ray.
• Added mujoco results. Much better than openai spinning up ppo results.
• Added tcnn(https://github.com/NVlabs/tiny-cuda-nn) support. Reduces 5-10% of training time in the IsaacGym envs.
• Various fixes and improvements.

1.3.2

• Added 'sigma' command line parameter. Will override sigma for continuous space in case if fixed_sigma is True.

1.3.1

• Fixed SAC not working

1.3.0

• Simplified rnn implementation. Works a little bit slower but much more stable.
• Now central value can be non-rnn if policy is rnn.
• Removed load_checkpoint from the yaml file. now --checkpoint works for both train and play.

1.2.0

• Added Swish (SILU) and GELU activations, it can improve Isaac Gym results for some of the envs.
• Removed tensorflow and made initial cleanup of the old/unused code.
• Simplified runner.
• Now networks are created in the algos with load_network method.

1.1.4

• Fixed crash in a play (test) mode in player, when simulation and rl_devices are not the same.
• Fixed variuos multi gpu errors.

1.1.3

• Fixed crash when running single Isaac Gym environment in a play (test) mode.
• Added config parameter clip_actions for switching off internal action clipping and rescaling

1.1.0

• Added to pypi: pip install rl-games
• Added reporting env (sim) step fps, without policy inference. Improved naming.
• Renames in yaml config for better readability: steps_num to horizon_length amd lr_threshold to kl_threshold

Troubleshouting

• Some of the supported envs are not installed with setup.py, you need to manually install them
• Starting from rl-games 1.1.0 old yaml configs won't be compatible with the new version:
  • steps_num should be changed to horizon_length amd lr_threshold to kl_threshold

Known issues

• Running a single environment with Isaac Gym can cause crash, if it happens switch to at least 2 environments simulated in parallel