code: def test_nest_constant(self, dtype):
      ndtype = dtype_util.as_numpy_dtype(dtype)
      input_structure = (
          np.ones(4, dtype=ndtype),
          (np.eye(3, dtype=ndtype), np.zeros(4, dtype=ndtype)),
      )
      ones_like_structure = rk_util.nest_constant(input_structure)
      tf.nest.assert_same_structure(
          input_structure, ones_like_structure
      )
      flat_ones_like_structure = tf.nest.flatten(ones_like_structure)
      for component in flat_ones_like_structure:
          self.assertAllClose(component, tf.ones(shape=component.shape))
  
file_path: probability/tensorflow_probability/python/math/ode/runge_kutta_util_test.py
imports: from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import dtype_util
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math.ode import runge_kutta_util
label_desc: Use image node_id 9 for calling the RungeKuttaUtilTest obj's underlying member method code with example usage: obj.test_nest_constant(dtype) without return types