torchrl.envs package¶
TorchRL offers a comprehensive API to handle environments of different backends, making it easy to swap environments in an experiment with minimal effort. The library provides wrappers for popular RL frameworks including Gym, DMControl, Brax, Jumanji, and many others.
The EnvBase class serves as the foundation, providing a unified interface that uses
tensordict.TensorDict for data organization. This design allows the framework to be generic and
handle an arbitrary number of inputs and outputs, as well as nested or batched data structures.
Key Features¶
Unified API: Consistent interface across different environment backends
Vectorization: Built-in support for parallel and batched environments
Transforms: Powerful transform system for preprocessing observations and actions
Multi-agent: Native support for multi-agent RL with no additional infrastructure
Flexible backends: Easy integration with Gym, DMControl, Brax, and custom environments
Quick Example¶
from torchrl.envs import GymEnv, ParallelEnv, TransformedEnv
from torchrl.envs.transforms import RewardSum, StepCounter
# Create a single environment
env = GymEnv("Pendulum-v1")
# Add transforms
env = TransformedEnv(env, RewardSum())
# Create parallel environments
def make_env():
return TransformedEnv(
GymEnv("Pendulum-v1"),
StepCounter(max_steps=200)
)
parallel_env = ParallelEnv(4, make_env)
# Run a rollout
rollout = parallel_env.rollout(100)
