code: def tearDown(self):
      self.configspace = None
      self.x_train = None
      self.x_test = None
  
imports: import os
  import unittest
  import numpy
  from scipy.integrate import quad
  from statsmodels.nonparametric import kernels
  from hpbandster.optimizers.kde import kernels
  import ConfigSpace
  from pdb import set_trace
label_desc: Use image node_id 2 for calling the Test1dCategorical obj's underlying member method code with example usage: obj.tearDown() without return types