code: def test_KD_tree_counterfactual_explanations_output(
      self, desired_range, sample_custom_query_2, total_CFs
  ):
      counterfactual_explanations = (
          self.exp_regr.generate_counterfactuals(
              query_instances=sample_custom_query_2,
              total_CFs=total_CFs,
              desired_range=desired_range,
          )
      )
  
      assert counterfactual_explanations is not None
      json_str = counterfactual_explanations.to_json()
      assert json_str is not None
  
      recovered_counterfactual_explanations = (
          CounterfactualExplanations.from_json(json_str)
      )
      assert recovered_counterfactual_explanations is not None
      assert (
          counterfactual_explanations
          == recovered_counterfactual_explanations
      )
  
imports: import numpy
  import pytest
  from dice_ml.counterfactual_explanations import CounterfactualExplanations
  from dice_ml.diverse_counterfactuals import CounterfactualExamples
label_desc: Use image node_id 3 for calling the TestDiceKDRegressionMethods obj's underlying member method code with example usage: obj.test_KD_tree_counterfactual_explanations_output(desired_range, sample_custom_query_2, total_CFs) without return types