Fix newer Gym support

Author: Miffyli

minerl/herobraine/hero/handlers/agent/observations/lifestats.py

@@ -59,8 +59,8 @@ class _IsAliveObservation(LifeStatsObservation):
     def __init__(self):
         keys = ['is_alive']
         super().__init__(hero_keys=keys, univ_keys=keys,
-                         space=spaces.Box(low=False, high=True, shape=(), dtype=bool),
-                         default_if_missing=True)
+                         space=spaces.Box(low=0, high=1, shape=(), dtype=bool),
+                         default_if_missing=1)
 
 
 class _LifeObservation(LifeStatsObservation):

minerl/herobraine/hero/spaces.py

@@ -203,7 +203,6 @@ class Discrete(gym.spaces.Discrete, MineRLSpace):
     def __init__(self, *args, **kwargs):
         super(Discrete, self).__init__(*args, **kwargs)
         self.eye = np.eye(self.n, dtype=np.float32)
-        self.shape = ()
 
     def no_op(self, batch_shape=()):
         if len(batch_shape) == 0:

requirements.txt

@@ -1,4 +1,4 @@
-gym @ git+https://github.com/minerllabs/gym@minerl-fix
+gym>=0.19.0,<=0.23.1
 opencv-python>=4.1.0.25
 setuptools>=49.2.0
 tqdm>=4.32.2