code: def _sum_losses(self, losses_dict):
      losses_dict["loss_total"] = sum(losses_dict.values())
      return losses_dict
  
file_path: icevision/icevision/models/interpretation.py
imports: from icevision.imports import *
  from icevision.utils import *
  from icevision.core import *
  from icevision.data import *
  from icevision.visualize.show_data import show_preds
  from icevision.core.record_components import LossesRecordComponent
label_desc: Use image node_id 3 for calling the Interpretation obj's underlying member method code with example usage: obj._sum_losses(losses_dict) and returns: losses_dict