code: def get_loss(self, **kwargs):
      # losses = self(**data)
  
      return self.forward_train(self, **kwargs)
  
file_path: PaddleDetection/ppdet/modeling/architectures/multi_stream_detector.py
imports: from typing import Dict
  from collections import OrderedDict
  from ppdet.modeling.architectures.meta_arch import BaseArch
label_desc: Use image node_id 3 for calling the MultiSteamDetector obj's underlying member method code with example usage: obj.get_loss() and returns: self