code: def _get_parent_name(self, parent_):
      if parent_ is None:
          return "data"
      return self._get_layer_name(parent_)
  
imports: import collections
  import heapq
  import os
  import numpy
  import six
  import chainer
  from chainer import function
  from chainer import function_node
  from chainer.links.caffe.protobuf3 import caffe_pb2
  from chainer import variable
label_desc: Use image node_id 3 for calling the _RetrieveAsCaffeModel obj's underlying member method code with example usage: obj._get_parent_name(parent_) and returns: self, str