code: def _get_prediction_device(self) -> int:
          
          devices = {util.get_device_of(param) for param in self.parameters()}
  
          if len(devices) > 1:
              devices_string = ", ".join(str(x) for x in devices)
              raise ConfigurationError(f"Parameters have mismatching cuda_devices: {devices_string}")
          elif len(devices) == 1:
              return devices.pop()
          else:
              return -1
docs: This method checks the device of the model parameters to determine the cuda_device
          this model should be run on for predictions.  If there are no parameters, it returns -1.
  
          Returns
          -------
          The cuda device this model should run on for predictions.