code: def test_to_dict_copies_value_structure(self):
      v = [1, 2, 3]
      mapping_in = {"m": {"w": v}}
      mapping_out = data_structures.to_dict(mapping_in)
      self.assertEqual(mapping_in, mapping_out)
      self.assertIsNot(mapping_in["m"]["w"], mapping_out["m"]["w"])
      v.append(4)
      self.assertNotEqual(mapping_in, mapping_out)
  
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 2 for calling the DataStructuresTest obj's underlying member method code with example usage: obj.test_to_dict_copies_value_structure() without return types