code: def test_feature_importance(self):
      sf = self.model.get_feature_importance()
      self.assertEqual(sf.column_names(), ["name", "index", "count"])
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  import math
  import uuid
  import random
  import sys
  import copy
  from turicreate.toolkits import evaluation
  from turicreate.toolkits._main import ToolkitError
  import shutil
  import numpy
  from array import array
  import os
label_desc: Use image node_id 12 for calling the RandomForestRegressionTest obj's underlying member method code with example usage: obj.test_feature_importance() without return types