When running the single agent training example from the baseline repo, there will be warnings popup from the command line:
/flatland-rl-path/flatland-rl/lib/python3.6/site-packages/flatland/envs/rail_generators.py:683: UserWarning: Could not set trainstations, please change initial parameters!!!!
The code file containts the initialization:
env = RailEnv(width=x_dim,
height=y_dim,
rail_generator=sparse_rail_generator(num_cities=5,
# Number of cities in map (where train stations are)
num_intersections=4,
# Number of intersections (no start / target)
num_trainstations=10, # Number of possible start/targets on map
min_node_dist=3, # Minimal distance of nodes
node_radius=2, # Proximity of stations to city center
num_neighb=3,
# Number of connections to other cities/intersections
seed=15, # Random seed
grid_mode=True,
enhance_intersection=False
),
schedule_generator=sparse_schedule_generator(speed_ration_map),
number_of_agents=n_agents,
stochastic_data=stochastic_data, # Malfunction data generator
obs_builder_object=TreeObservation)
in which num_cities = 5 but num_trainstations=10.
Are the warnings related to the settings?
If not, may I ask why trainstations# is more than cities#? From the doc, it seems trainstations can only exist in cities?
Thanks.