Source code for omni.isaac.lab_tasks.utils.wrappers.skrl
# Copyright (c) 2022-2024, The Isaac Lab Project Developers.
# All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
"""Wrapper to configure an :class:`ManagerBasedRLEnv` instance to skrl environment.
The following example shows how to wrap an environment for skrl:
.. code-block:: python
from omni.isaac.lab_tasks.utils.wrappers.skrl import SkrlVecEnvWrapper
env = SkrlVecEnvWrapper(env)
Or, equivalently, by directly calling the skrl library API as follows:
.. code-block:: python
from skrl.envs.torch.wrappers import wrap_env
env = wrap_env(env, wrapper="isaaclab")
"""
# needed to import for type hinting: Agent | list[Agent]
from __future__ import annotations
from skrl.envs.wrappers.torch import wrap_env
from skrl.resources.preprocessors.torch import RunningStandardScaler # noqa: F401
from skrl.resources.schedulers.torch import KLAdaptiveLR # noqa: F401
from skrl.utils.model_instantiators.torch import Shape # noqa: F401
from omni.isaac.lab.envs import DirectRLEnv, ManagerBasedRLEnv
"""
Configuration Parser.
"""
[docs]def process_skrl_cfg(cfg: dict) -> dict:
"""Convert simple YAML types to skrl classes/components.
Args:
cfg: A configuration dictionary.
Returns:
A dictionary containing the converted configuration.
"""
_direct_eval = [
"learning_rate_scheduler",
"state_preprocessor",
"value_preprocessor",
"input_shape",
"output_shape",
]
def reward_shaper_function(scale):
def reward_shaper(rewards, timestep, timesteps):
return rewards * scale
return reward_shaper
def update_dict(d):
for key, value in d.items():
if isinstance(value, dict):
update_dict(value)
else:
if key in _direct_eval:
d[key] = eval(value)
elif key.endswith("_kwargs"):
d[key] = value if value is not None else {}
elif key in ["rewards_shaper_scale"]:
d["rewards_shaper"] = reward_shaper_function(value)
return d
# parse agent configuration and convert to classes
return update_dict(cfg)
"""
Vectorized environment wrapper.
"""
[docs]def SkrlVecEnvWrapper(env: ManagerBasedRLEnv):
"""Wraps around Isaac Lab environment for skrl.
This function wraps around the Isaac Lab environment. Since the :class:`ManagerBasedRLEnv` environment
wrapping functionality is defined within the skrl library itself, this implementation
is maintained for compatibility with the structure of the extension that contains it.
Internally it calls the :func:`wrap_env` from the skrl library API.
Args:
env: The environment to wrap around.
Raises:
ValueError: When the environment is not an instance of :class:`ManagerBasedRLEnv`.
Reference:
https://skrl.readthedocs.io/en/latest/api/envs/wrapping.html
"""
# check that input is valid
if not isinstance(env.unwrapped, ManagerBasedRLEnv) and not isinstance(env.unwrapped, DirectRLEnv):
raise ValueError(
f"The environment must be inherited from ManagerBasedRLEnv or DirectRLEnv. Environment type: {type(env)}"
)
# wrap and return the environment
return wrap_env(env, wrapper="isaaclab")