code: def test_unknown():
      inputs = np.random.random((5, 4, 2, 18)).astype("float32")
      test_utils.layer_test(
          Maxout,
          kwargs={"num_units": 3},
          input_shape=(5, 4, 2, None),
          input_data=inputs,
      )
  
      test_utils.layer_test(
          Maxout,
          kwargs={"num_units": 3},
          input_shape=(None, None, None, None),
          input_data=inputs,
      )
  
file_path: addons/tensorflow_addons/layers/tests/maxout_test.py
imports: import pytest
  import numpy
  from tensorflow_addons.layers.maxout import Maxout
  from tensorflow_addons.utils import test_utils
label_desc: Use image node_id 3 for calling a global function with example usage: test_unknown() without return types