the issue in outputs of csv

[AviwellLiu]

def save_csv(self, out_csv_name, episode):
"""Save metrics of the simulation to a .csv file.

    Args:
        out_csv_name (str): Path to the output .csv file. E.g.: "results/my_results
        episode (int): Episode number to be appended to the output file name.
    """
    if out_csv_name is not None:
        df = pd.DataFrame(self.metrics)
        Path(Path(out_csv_name).parent).mkdir(parents=True, exist_ok=True)
        df.to_csv(out_csv_name + f"_conn{self.label}_ep{episode}" + ".csv", index=False)

def _compute_info(self):
info = {"step": self.sim_step}
if self.add_system_info:
info.update(self._get_system_info())
if self.add_per_agent_info:
info.update(self._get_per_agent_info())
self.metrics.append(info.copy())
return info
def _get_system_info(self):
vehicles = self.sumo.vehicle.getIDList()
speeds = [self.sumo.vehicle.getSpeed(vehicle) for vehicle in vehicles]
waiting_times = [self.sumo.vehicle.getWaitingTime(vehicle) for vehicle in vehicles]
num_backlogged_vehicles = len(self.sumo.simulation.getPendingVehicles())
return {
"system_total_running": len(vehicles),
"system_total_backlogged": num_backlogged_vehicles,
"system_total_stopped": sum(
int(speed < 0.1) for speed in speeds
), # In SUMO, a vehicle is considered halting if its speed is below 0.1 m/s
"system_total_arrived": self.num_arrived_vehicles,
"system_total_departed": self.num_departed_vehicles,
"system_total_teleported": self.num_teleported_vehicles,
"system_total_waiting_time": sum(waiting_times),
"system_mean_waiting_time": 0.0 if len(vehicles) == 0 else np.mean(waiting_times),
"system_median_waiting_time": 0.0 if len(waiting_times) == 0 else np.median(waiting_times), #------traget data
"system_mean_speed": 0.0 if len(vehicles) == 0 else np.mean(speeds),
}
the above code means if I want to get new index in csv,I need to update info,but when i try to add it into _get_system_info，There hasn't been any change in output csv.otherwise,the output csv only has partial information of _get_system_info.