fix test_env_prediction_builder

flatland/core/env.py

@@ -84,7 +84,6 @@ class Environment:
         """
         raise NotImplementedError()
 
-
     def get_agent_handles(self):
         """
         Returns a list of agents' handles to be used as keys in the step()

flatland/envs/observations.py

@@ -295,7 +295,6 @@ class TreeObsForRailEnv(ObservationBuilder):
         other_target_encountered = np.inf
         other_agent_same_direction = 0
         other_agent_opposite_direction = 0
-        possible_conflict = 0
 
         num_steps = 1
         while exploring:

tests/test_env_prediction_builder.py

@@ -64,7 +64,7 @@ def test_predictions():
                   height=rail_map.shape[0],
                   rail_generator=rail_from_GridTransitionMap_generator(rail),
                   number_of_agents=1,
-                  obs_builder_object=TreeObsForRailEnv(max_depth=20, predictor=DummyPredictorForRailEnv(max_depth=20)),
+                  obs_builder_object=TreeObsForRailEnv(max_depth=2, predictor=DummyPredictorForRailEnv(max_depth=20)),
                   )
 
     env.reset()