Obstacles about minigrid HOT 5 CLOSED

Can you paste the assertion that you get?

from minigrid.

Traceback (most recent call last):
File "C:\Users\Frost\Documents\Dropbox\ITU\KurserITU\Thesis Project\Repository\src\tests\minigrid-obstacles-bug-example.py", line 11, in
observation, reward, done, info = env.step(action)
File "C:\Users\Frost\AppData\Local\Programs\Python\Python36\lib\site-packages\gym_minigrid\envs\dynamicobstacles.py", line 75, in step
self.grid.set(*old_pos, None)
File "C:\Users\Frost\AppData\Local\Programs\Python\Python36\lib\site-packages\gym_minigrid\minigrid.py", line 401, in set
assert i >= 0 and i < self.width
AssertionError

from minigrid.

I have been trying to figure out whats happening and somehow
one of the obstacles cur_pos has assummed the value [-1, -1] but I don't know why

from minigrid.

I found the problem:
The agent successfully picked up one of the obstacles (which sets the obstacles current position to [-1, -1])
Then when the obstacle tried to move it realizes that its current position is out of the grid and raises an error.

The obvious fix is to stop allowing the obstacles to be picked up by adding this in
dynamicobstacles.py : DynamicObstaclesEnv.
self.obstacles[i_obst].can_pickup = lambda: False
where the obstacles are created

from minigrid.

Technically, the bug is on your end, because you're not respecting the action space of the environment, see env.action_space.n.

But, I added a check for invalid actions to prevent more people running into this: f3db6a7

from minigrid.