code: def test_traverse_tuple_items(self):
      x = (1, 2, 3, 4)
      traversal = traverse_util.t_identity[1:3]
      self.assertEqual(list(traversal.iterate(x)), [2, 3])
      y = traversal.update(lambda x: x + x, x)
      self.assertEqual(y, (1, 4, 6, 4))
  
imports: import collections
  import jax
  import jax.numpy
  import numpy
  import optax
  from absl.testing import absltest
  import flax
  from flax import traverse_util
  from flax.core import freeze
label_desc: Use image node_id 4 for calling the TraversalTest obj's underlying member method code with example usage: obj.test_traverse_tuple_items() without return types