code: def test_tree_transpose(self):
      outerdef = jax.tree_util.tree_structure(FlatMap({"a": 1, "b": 2}))
      innerdef = jax.tree_util.tree_structure([1, 2])
      self.assertEqual(
          [FlatMap({"a": 3, "b": 5}), FlatMap({"a": 4, "b": 6})],
          jax.tree_util.tree_transpose(
              outerdef, innerdef, FlatMap({"a": [3, 4], "b": [5, 6]})
          ),
      )
  
imports: import collections
  import copy
  import pickle
  import threading
  from absl.testing import absltest
  from absl.testing import parameterized
  import cloudpickle
  import dill
  from haiku._src import data_structures
  import jax
  import tree
label_desc: Use image node_id 30 for calling the FlatMappingTest obj's underlying member method code with example usage: obj.test_tree_transpose() without return types