[Bug Report] ViewSizeWrapper ignored with RGBImgPartialObsWrapper

[lpjiang97]

Describe the bug
When wrapped after the RGBImgPartialObsWrapper, the agent_view_size set in ViewSizeWrapper is ignored.

Code example

env = gym.make("MiniGrid-Empty-8x8-v0")
env = RGBImgPartialObsWrapper(ViewSizeWrapper(env, agent_view_size=5))
env = ImgObsWrapper(env)

obs, info = env.reset(seed=10)
print(env.agent_view_size) # returns 5
plt.imshow(obs)

The image plotted shows a view size of 7.

System Info

• minigrid was pip installed.
• Cent OS with Python 3.10

Checklist

• I have checked that there is no similar issue in the repo (required)

[vishwassathish]

I created a pull request to resolve this bug. After the ViewSizeWrapper, env.unwrapped.agent_view_size remains at its default value of 7 which the RGBImgPartialObsWrapper uses.

env = gym.make("MiniGrid-Empty-8x8-v0")
env = ViewSizeWrapper(env, agent_view_size=5)

obs, info = env.reset(seed=10)
print(env.agent_view_size)                  # returns 5
print(env.unwrapped.agent_view_size)        # returns 7