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| """A passive environment checker wrapper for an environment's observation and action space along with the reset, step and render functions.""" | |
| import gym | |
| from gym.core import ActType | |
| from gym.utils.passive_env_checker import ( | |
| check_action_space, | |
| check_observation_space, | |
| env_render_passive_checker, | |
| env_reset_passive_checker, | |
| env_step_passive_checker, | |
| ) | |
| class PassiveEnvChecker(gym.Wrapper): | |
| """A passive environment checker wrapper that surrounds the step, reset and render functions to check they follow the gym API.""" | |
| def __init__(self, env): | |
| """Initialises the wrapper with the environments, run the observation and action space tests.""" | |
| super().__init__(env) | |
| assert hasattr( | |
| env, "action_space" | |
| ), "The environment must specify an action space. https://www.gymlibrary.dev/content/environment_creation/" | |
| check_action_space(env.action_space) | |
| assert hasattr( | |
| env, "observation_space" | |
| ), "The environment must specify an observation space. https://www.gymlibrary.dev/content/environment_creation/" | |
| check_observation_space(env.observation_space) | |
| self.checked_reset = False | |
| self.checked_step = False | |
| self.checked_render = False | |
| def step(self, action: ActType): | |
| """Steps through the environment that on the first call will run the `passive_env_step_check`.""" | |
| if self.checked_step is False: | |
| self.checked_step = True | |
| return env_step_passive_checker(self.env, action) | |
| else: | |
| return self.env.step(action) | |
| def reset(self, **kwargs): | |
| """Resets the environment that on the first call will run the `passive_env_reset_check`.""" | |
| if self.checked_reset is False: | |
| self.checked_reset = True | |
| return env_reset_passive_checker(self.env, **kwargs) | |
| else: | |
| return self.env.reset(**kwargs) | |
| def render(self, *args, **kwargs): | |
| """Renders the environment that on the first call will run the `passive_env_render_check`.""" | |
| if self.checked_render is False: | |
| self.checked_render = True | |
| return env_render_passive_checker(self.env, *args, **kwargs) | |
| else: | |
| return self.env.render(*args, **kwargs) | |