Fixed sequence env minor (#333)

minor changes to FixedSequenceEnv to allow full score

baselines/common/tests/envs/fixed_sequence_env.py

@@ -9,18 +9,16 @@ class FixedSequenceEnv(Env):
             n_actions=10,
             episode_len=100
     ):
-        self.np_random = np.random.RandomState()
-        self.sequence = None
-
         self.action_space = Discrete(n_actions)
         self.observation_space = Discrete(1)
-
+        self.np_random = np.random.RandomState(0)
         self.episode_len = episode_len
+        self.sequence = [self.np_random.randint(0, self.action_space.n)
+            for _ in range(self.episode_len)]
         self.time = 0
 
+
     def reset(self):
-        if self.sequence is None:
-            self.sequence = [self.np_random.randint(0, self.action_space.n-1) for _ in range(self.episode_len)]
         self.time = 0
         return 0
 
@@ -29,7 +27,6 @@ class FixedSequenceEnv(Env):
         self._choose_next_state()
         done = False
         if self.episode_len and self.time >= self.episode_len:
-            rew = 0
             done = True
 
         return 0, rew, done, {}