code: def get_loss(
      self,
  ):
      raise NotImplementedError("Should implement get_loss method!")
  
file_path: PaddleDetection/ppdet/modeling/architectures/meta_arch.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import paddle
  import paddle.nn
  import typing
  from ppdet.core.workspace import register
  from ppdet.modeling.post_process import nms
label_desc: Use image node_id 7 for calling the BaseArch obj's underlying member method code with example usage: obj.get_loss() without return types