minor updates

examples/flatland_2_0_example.py

@@ -28,16 +28,16 @@ speed_ration_map = {1.: 1.,  # Fast passenger train
                     1. / 3.: 0.,  # Slow commuter train
                     1. / 4.: 0.}  # Slow freight train
 
-env = RailEnv(width=50,
-              height=50,
-              rail_generator=sparse_rail_generator(num_cities=12,  # Number of cities in map (where train stations are)
+env = RailEnv(width=100,
+              height=100,
+              rail_generator=sparse_rail_generator(num_cities=20,  # Number of cities in map (where train stations are)
                                                    seed=10,  # Random seed
                                                    grid_mode=False,
                                                    max_inter_city_rails=2,
                                                    max_tracks_in_city=4,
                                                    ),
               schedule_generator=sparse_schedule_generator(),
-              number_of_agents=100,
+              number_of_agents=50,
               stochastic_data=stochastic_data,  # Malfunction data generator
               obs_builder_object=GlobalObsForRailEnv(),
               remove_agents_at_target=True