code: def test_traverse(self, n):
      structure = {
          f"layer_{i}": {"w": "wv", "b": "bv"}
          for i in reversed(range(n))
      }
      expected = []
      for i in range(n):
          expected.append((f"layer_{i}", "b", "bv"))
          expected.append((f"layer_{i}", "w", "wv"))
      actual = list(filtering.traverse(structure))
      self.assertEqual(expected, actual)
  
imports: import collections
  from collections.abc import Sequence
  import itertools
  import re
  import types
  from typing import Any, Callable
  from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import basic
  from haiku._src import data_structures
  from haiku._src import filtering
  from haiku._src import transform
  import jax
  import jax.numpy
label_desc: Use image node_id 5 for calling the FilteringTest obj's underlying member method code with example usage: obj.test_traverse(n) without return types