code: def test_partition_n_merge_isomorphism(self, n):
      cnt = itertools.count()
      fn = lambda m, n, v: next(cnt)
      input_structure = {f"layer_{i}": {"w": None} for i in range(n)}
      structures = filtering.partition_n(fn, input_structure, n)
      merged_structure = filtering.merge(*structures)
      self.assertEqual(merged_structure, input_structure)
  
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 4 for calling the FilteringTest obj's underlying member method code with example usage: obj.test_partition_n_merge_isomorphism(n) without return types