code: def _build_tail(self, features, **kargs):
      return features
  
file_path: luminoth/luminoth/models/fasterrcnn/rcnn_test.py
imports: import numpy
  import tensorflow
  from easydict import EasyDict
  from luminoth.models.fasterrcnn.rcnn import RCNN
label_desc: Use image node_id 1 for calling the MockBaseNetwork obj's underlying member method code with example usage: obj._build_tail(features) and returns: features