code: def test_float64(self):
      low, high = self.evaluate(
          root_search.bracket_root(
              lambda x: (x - np.pi) ** 3, dtype=np.float64
          )
      )
      self.assertEqual(low.dtype, np.float64)
      self.assertEqual(high.dtype, np.float64)
      self.assertLess(low, np.pi)
      self.assertGreater(high, np.pi)
  
imports: import numpy
  import scipy.optimize
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import samplers
  from tensorflow_probability.python.internal import special_math
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math import root_search
label_desc: Use image node_id 6 for calling the BracketRootTest obj's underlying member method code with example usage: obj.test_float64() without return types