code: def test_del_variables(self):
      self.model.del_variables(["x3"])
      np_test.assert_array_equal(
          self.model.variables, np.array(["x1", "x2"])
      )
      np_test.assert_array_equal(
          self.model.cardinality, np.array([2, 3])
      )
      self.assertListEqual(
          self.model.inhibitor_probability,
          [[0.6, 0.4], [0.2, 0.4, 0.7]],
      )
  
file_path: pgmpy/pgmpy/tests/test_models/test_NoisyOrModels.py
imports: import unittest
  import numpy
  import numpy.testing
  from pgmpy.models import NoisyOrModel
label_desc: Use image node_id 3 for calling the TestNoisyOrModelMethods obj's underlying member method code with example usage: obj.test_del_variables() without return types