### Required prerequisites - [x] I have read the documentation <https://omnisafe.readthedocs.io>. - [x] I have searched the [Issue Tracker](https://github.com/PKU-Alignment/omnisafe/issues) and [Discussions](https://github.com/PKU-Alignment/omnisafe/discussions) that this hasn't already been reported. (+1 or comment there if it has.) - [x] Consider asking first in a [Discussion](https://github.com/PKU-Alignment/omnisafe/discussions/new). ### Questions As I know Omnisafe provides an interface for MetaDrive. After having Omnisafe installed, I proceeded to install the latest MetaDrive environment following the regular installation steps. However, whenever I attempt to run the example code, I'm constantly faced with import errors. When executing the following installation instructions for Metadrive, an import error still appears. It seems that the issue is caused by the installed versions of the dependency packages. `pip install metadrive` or ``` git clone https://github.com/metadriverse/metadrive.git cd metadrive pip install -e . ``` The error messages are as follows: ``` python train_policy.py --algo PPOLag --env SafeMetaDrive Loading PPOLag.yaml from /home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/utils/../configs/on-policy/PPOLag.yaml Traceback (most recent call last): File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/examples/train_policy.py", line 84, in <module> agent = omnisafe.Agent( File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/algorithms/algo_wrapper.py", line 73, in __init__ self._init_algo() File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/algorithms/algo_wrapper.py", line 167, in _init_algo self.agent: BaseAlgo = registry.get(self.algo)( File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/algorithms/base_algo.py", line 48, in __init__ self._init_env() File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/algorithms/on_policy/base/policy_gradient.py", line 64, in _init_env self._env: OnPolicyAdapter = OnPolicyAdapter( File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/adapter/onpolicy_adapter.py", line 55, in __init__ super().__init__(env_id, num_envs, seed, cfgs) File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/adapter/online_adapter.py", line 71, in __init__ self._env: CMDP = make(env_id, num_envs=num_envs, device=self._device, **env_cfgs) File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/envs/core.py", line 421, in make return env_class(env_id, **kwargs) File "/home/DeepAI/opt/thesis/multi-constraint/omnisafe_metadrive/omnisafe/envs/meta_drive_env.py", line 86, in __init__ raise ImportError( ImportError: Please install MetaDrive to use SafeMetaDrive! Install from source: https://github.com/metadriverse/metadrive. Install from PyPI: `pip install metadrive`. ```