mirror of
https://github.com/vale981/ray
synced 2025-03-06 02:21:39 -05:00
52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
import gym
|
|
|
|
from ray.rllib.env.env_context import EnvContext
|
|
from ray.rllib.utils.error import ERR_MSG_INVALID_ENV_DESCRIPTOR, EnvError
|
|
|
|
|
|
def _gym_env_creator(env_context: EnvContext, env_descriptor: str) -> gym.Env:
|
|
"""Tries to create a gym env given an EnvContext object and descriptor.
|
|
|
|
Note: This function tries to construct the env from a string descriptor
|
|
only using possibly installed RL env packages (such as gym, pybullet_envs,
|
|
vizdoomgym, etc..). These packages are no installation requirements for
|
|
RLlib. In case you would like to support more such env packages, add the
|
|
necessary imports and construction logic below.
|
|
|
|
Args:
|
|
env_context: The env context object to configure the env.
|
|
Note that this is a config dict, plus the properties:
|
|
`worker_index`, `vector_index`, and `remote`.
|
|
env_descriptor: The env descriptor, e.g. CartPole-v0,
|
|
MsPacmanNoFrameskip-v4, VizdoomBasic-v0, or
|
|
CartPoleContinuousBulletEnv-v0.
|
|
|
|
Returns:
|
|
The actual gym environment object.
|
|
|
|
Raises:
|
|
gym.error.Error: If the env cannot be constructed.
|
|
"""
|
|
# Allow for PyBullet or VizdoomGym envs to be used as well
|
|
# (via string). This allows for doing things like
|
|
# `env=CartPoleContinuousBulletEnv-v0` or
|
|
# `env=VizdoomBasic-v0`.
|
|
try:
|
|
import pybullet_envs
|
|
|
|
pybullet_envs.getList()
|
|
except (ModuleNotFoundError, ImportError):
|
|
pass
|
|
try:
|
|
import vizdoomgym
|
|
|
|
vizdoomgym.__name__ # trick LINTer.
|
|
except (ModuleNotFoundError, ImportError):
|
|
pass
|
|
|
|
# Try creating a gym env. If this fails we can output a
|
|
# decent error message.
|
|
try:
|
|
return gym.make(env_descriptor, **env_context)
|
|
except gym.error.Error:
|
|
raise EnvError(ERR_MSG_INVALID_ENV_DESCRIPTOR.format(env_descriptor))
|