code: def test_evaluate_numerical(self):
      feature = Feature("   5 +x1 *    (4-x2)")
      actual = feature.evaluate({"x1": 6.3, "x2": 3.1})
      expected = 5 + 6.3 * (4 - 3.1)
      self.assertAlmostEqual(actual, expected)
  
file_path: AIX360/tests/rule_induction/trxf/core/test_feature.py
imports: import tokenize
  from unittest import TestCase
  from aix360.algorithms.rule_induction.trxf.core.feature import Feature, _shunting_yard
label_desc: Use image node_id 2 for calling the TestFeature obj's underlying member method code with example usage: obj.test_evaluate_numerical() without return types