code: def test_bound_scalar(self, tp, fn, fp, tn, method, expected_value):
      rb = elb.RatioBound(tp, fp, tp + fn, fp + tn, 0.05)
      res = rb.compute_bound(method)
      self.assertAlmostEqual(res, expected_value)
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  from tensorflow_privacy.privacy.privacy_tests import epsilon_lower_bound
label_desc: Use image node_id 1 for calling the RatioBoundTest obj's underlying member method code with example usage: obj.test_bound_scalar(tp, fn, fp, tn, method, expected_value) without return types