code: def test_perfect_initial_guess_terminates(self):
      # The initial guess is zero, which causes problems if the minimum is also
      # at zero since then there's no zero-crossing to trigger the count.
      helpers.estimate_tails(
          tf.math.tanh, target=0.0, shape=(), dtype=tf.float32
      )
  
imports: import tensorflow
  import tensorflow_probability
  from tensorflow_compression.python.distributions import deep_factorized
  from tensorflow_compression.python.distributions import helpers
label_desc: Use image node_id 2 for calling the HelpersTest obj's underlying member method code with example usage: obj.test_perfect_initial_guess_terminates() without return types