code: def test_tree_map_zipped(self):
      nests = [
          dict(a=jnp.zeros((1, 3)), b=jnp.zeros((1, 5)))
      ] * NUM_NESTS
      nest_output = tree_util.tree_map_zipped(
          lambda *args: jnp.concatenate(args), nests
      )
      self.assertEqual(nest_output["a"].shape, (NUM_NESTS, 3))
      self.assertEqual(nest_output["b"].shape, (NUM_NESTS, 5))
  
file_path: rlax/rlax/_src/tree_util_test.py
imports: from absl.testing import absltest
  import chex
  import jax
  import jax.numpy
  import numpy
  from rlax._src import tree_util
label_desc: Use image node_id 2 for calling the TreeUtilTest obj's underlying member method code with example usage: obj.test_tree_map_zipped() without return types