code: def setUpClass(self):
      super(DecisionTreeClassifierTest, self).setUpClass()
      self.model = tc.decision_tree_classifier.create(
          self.sf, self.target, validation_set=None
      )
      self.has_predict_topk = True
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  import uuid
  from turicreate.toolkits import evaluation
  from turicreate.toolkits._main import ToolkitError
  import shutil
  import numpy
label_desc: Use image node_id 1 for calling the DecisionTreeClassifierTest obj's underlying member method code with example usage: obj.setUpClass() without return types