updated the way connected directions are chosen.

examples/flatland_2_0_example.py

@@ -32,10 +32,10 @@ speed_ration_map = {1.: 0.25,  # Fast passenger train
 
 env = RailEnv(width=50,
               height=50,
-              rail_generator=sparse_rail_generator(num_cities=9,  # Number of cities in map (where train stations are)
+              rail_generator=sparse_rail_generator(num_cities=11,  # Number of cities in map (where train stations are)
                                                    num_trainstations=50,  # Number of possible start/targets on map
-                                                   min_node_dist=15,  # Minimal distance of nodes
-                                                   node_radius=4,  # Proximity of stations to city center
+                                                   min_node_dist=8,  # Minimal distance of nodes
+                                                   node_radius=3,  # Proximity of stations to city center
                                                    seed=15,  # Random seed
                                                    grid_mode=False,
                                                    max_connection_points_per_side=2,