code: def test_decode_example_np_is_picklable(self):
      feature = feature_lib.Dataset(np.str_)
      example = [b"a"]
      pickle.loads(pickle.dumps(feature.decode_example_np(example)))
      pickle.loads(pickle.dumps(feature.decode_example_np))
      pickle.loads(pickle.dumps(feature_lib.Dataset.decode_example_np))
  
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 5 for calling the DecodeExampleNpTest obj's underlying member method code with example usage: obj.test_decode_example_np_is_picklable() without return types