code: def test_frozen_dict_copies(self):
      xs = {"a": 1, "b": {"c": 2}}
      frozen = freeze(xs)
      xs["a"] += 1
      xs["b"]["c"] += 1
      self.assertEqual(unfreeze(frozen), {"a": 1, "b": {"c": 2}})
  
file_path: flax/tests/core/core_frozen_dict_test.py
imports: import jax
  from absl.testing import absltest, parameterized
  from flax.core import FrozenDict, copy, freeze, pop, pretty_repr, unfreeze
label_desc: Use image node_id 1 for calling the FrozenDictTest obj's underlying member method code with example usage: obj.test_frozen_dict_copies() without return types