code: def test_golden_search_function(self):
      def f(x):
          return tf.sin(x) * x**-0.5
  
      def check_updates(step):
          return f(3 + step)
  
      best_step = fmin_golden_search(check_updates)
      self.assertAlmostEqual(1.6, self.eval(best_step), places=2)
  
      best_step = fmin_golden_search(check_updates, maxstep=1)
      self.assertAlmostEqual(1, self.eval(best_step), places=2)
  
imports: import tensorflow
  from neupy.algorithms.minsearch.golden_search import fmin_golden_search
  from base import BaseTestCase
label_desc: Use image node_id 2 for calling the GoldenSearchTestCase obj's underlying member method code with example usage: obj.test_golden_search_function() and returns: unknown, f