Blocker: dependancy : gym.util must be removed / or the setup must be checked!
The latest branch has a dependancy to gym.util. FLATland is an independant environement - thus not a gym. Therefore we have to refactor the gym.util depenandcy.
https://gitlab.aicrowd.com/search?utf8=%E2%9C%93&snippets=&scope=&search=gym.utils&project_id=452
Added: https://gitlab.aicrowd.com/flatland/flatland/commit/78c024521324ecd9f257f3899b7ba024adb6aa5d
Missing in requirements_xxx.txt --> cause crash on local installation.
flatland/envs/rail_env.py
import numpy as np
from gym.utils import seeding
from flatland.core.env import Environment