code: def get_all_vertices(self):
      vhash = {}
      self.get_all_vertice_helper(vhash)
      vlist = vhash.values()
      return vlist
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import turicreate
  import unittest
  import json
  import random
  import numpy
  import pytest
label_desc: Use image node_id 10 for calling the GBDTNode obj's underlying member method code with example usage: obj.get_all_vertices() and returns: vlist