code: def _assertClose(self, expected, stepper_result):
      actual = self.evaluate(stepper_result[0])
      self.assertLess(
          np.max(np.abs(actual - expected)) / np.max(expected), 0.01
      )
  
imports: from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  import tf_quant_finance
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 16 for calling the MultidimParabolicEquationStepperTest obj's underlying member method code with example usage: obj._assertClose(expected, stepper_result) without return types