code: def test_nested_dict(self):
      feature = feature_lib.Dataset(
          {"a": {"b": np.int32}, "b": np.str_}
      )
      example = {"a": {"b": [1, 2, 3]}, "b": ["a", "b", "c"]}
      expected = [
          {"a": {"b": 1}, "b": "a"},
          {"a": {"b": 2}, "b": "b"},
          {"a": {"b": 3}, "b": "c"},
      ]
      self.assertAllEqualNested(
          feature.decode_example_np(example), expected
      )
  
imports: import pickle
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import dataset_utils
  from tensorflow_datasets.core import decode
  from tensorflow_datasets.core import features
label_desc: Use image node_id 3 for calling the DecodeExampleNpTest obj's underlying member method code with example usage: obj.test_nested_dict() without return types