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https://github.com/Farama-Foundation/Gymnasium.git
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f6742ea808
* Remove AtariEnv in favour of official ALE Python * More robust frame stacking test case * Atari documentation update
40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
import pytest
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import numpy as np
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import gym
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from gym.wrappers import GrayScaleObservation
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from gym.wrappers import AtariPreprocessing
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pytest.importorskip("ale_py")
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pytest.importorskip("cv2")
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@pytest.mark.parametrize(
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"env_id", ["PongNoFrameskip-v0", "SpaceInvadersNoFrameskip-v0"]
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)
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@pytest.mark.parametrize("keep_dim", [True, False])
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def test_gray_scale_observation(env_id, keep_dim):
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gray_env = AtariPreprocessing(gym.make(env_id), screen_size=84, grayscale_obs=True)
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rgb_env = AtariPreprocessing(gym.make(env_id), screen_size=84, grayscale_obs=False)
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wrapped_env = GrayScaleObservation(rgb_env, keep_dim=keep_dim)
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assert rgb_env.observation_space.shape[-1] == 3
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seed = 0
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gray_env.seed(seed)
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wrapped_env.seed(seed)
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gray_obs = gray_env.reset()
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wrapped_obs = wrapped_env.reset()
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if keep_dim:
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assert wrapped_env.observation_space.shape[-1] == 1
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assert len(wrapped_obs.shape) == 3
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wrapped_obs = wrapped_obs.squeeze(-1)
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else:
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assert len(wrapped_env.observation_space.shape) == 2
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assert len(wrapped_obs.shape) == 2
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# ALE gray scale is slightly different, but no more than by one shade
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assert np.allclose(gray_obs.astype("int32"), wrapped_obs.astype("int32"), atol=1)
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