code: def _create_tmp_file(self, filename):
      return self.create_tempfile(filename).full_path
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import absltest
  from neural_structured_learning.tools import graph_utils
  from neural_structured_learning.tools import pack_nbrs
  import tensorflow
  from google.protobuf import text_format
label_desc: Use image node_id 2 for calling the PackNbrsTest obj's underlying member method code with example usage: obj._create_tmp_file(filename) and returns: self