Defining 'spec' as @property in UnityEnvironment() prevents from registering environment

[julienroyd]

Hi,

I am using gym==0.18.0 and gym-unity==0.23.0.

I know that gym.make() is not officially supported by unity_gym. However, I was wondering why the attribute spec was defined as a @property in gym_unity/envs/__init__:UnityToGymWrapper?

Having spec be a regular attribute rather than a @property would allow users to register themselves their unity environments and have their ML code simply call gym.make("MyUnityEnv-v0") for example, like the other RL benchmarks. For exemple, the user could simply implement something as simple as this in the repository containing the environments:

unity_env_wrapper.py:

from gym.envs.registration import register

from mlagents_envs.environment import UnityEnvironment
from gym_unity.envs import UnityToGymWrapper

class MyUnityEnv(UnityToGymWrapper):
    def __init__(self, **kwargs):
        unity_env = UnityEnvironment(file_name="<path-to-executable>")
        super().__init__(unity_env=unity_env, uint8_visual=False, flatten_branched=False, allow_multiple_obs=False)

register(
    id='MyUnityEnv-v0',
    entry_point='unity_env_wrapper:MyUnityEnv'
)

rl_script.py:

import unity_env_wrapper
import gym

env = gym.make("MyUnityEnv-v0")

Having spec being a @property triggers AttributeError: can't set attribute in gym/envs/registration.py

[Ademord]

@julienroyd I tried to register my environment following your code but i get an error when trying to use vectorized environments

Traceback (most recent call last):
  File "/usr/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/usr/lib/python3.8/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/home/ros/.local/lib/python3.8/site-packages/stable_baselines3/common/vec_env/subproc_vec_env.py", line 24, in _worker
    env = env_fn_wrapper.var()
  File "unity_test_vectrorized.py", line 19, in _init
    env = gym.make(env_id)
  File "/home/ros/.local/lib/python3.8/site-packages/gym/envs/registration.py", line 145, in make
    return registry.make(id, **kwargs)
  File "/home/ros/.local/lib/python3.8/site-packages/gym/envs/registration.py", line 89, in make
    spec = self.spec(path)
  File "/home/ros/.local/lib/python3.8/site-packages/gym/envs/registration.py", line 131, in spec
    raise error.UnregisteredEnv('No registered env with id: {}'.format(id))
gym.error.UnregisteredEnv: No registered env with id: BirdSingleAgentNoStackedNoVisual-v1

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