code: def get_target_buffers(self):
      return (
          (self.frcn_labels, self.frcn_labels_mask),
          (self.frcn_bbtargets, self.frcn_bbmask),
      )
  
file_path: neon/examples/faster-rcnn/tests/test_proposal_layer.py
imports: from __future__ import division
  from builtins import range
  from builtins import object
  import numpy
  import itertools
  from neon.backends import gen_backend
  from proposal_layer_ref import PyCaffeProposalLayer
  from proposal_target_layer_ref import PyCaffeProposalTargetLayer
  from proposal_layer import ProposalLayer
label_desc: Use image node_id 3 for calling the mock_dataloader obj's underlying member method code with example usage: obj.get_target_buffers() and returns: self,  self,  self,  self