code: def test_reduction_2d_tensor_return_input_node():
      block = blocks.TemporalReduction()
      input_node = keras.Input(shape=(32,), dtype=tf.float32)
  
      outputs = block.build(
          keras_tuner.HyperParameters(),
          input_node,
      )
  
      assert len(nest.flatten(outputs)) == 1
      assert nest.flatten(outputs)[0] is input_node
  
imports: import keras_tuner
  import tensorflow
  from tensorflow import keras
  from tensorflow import nest
  from autokeras import blocks
  from autokeras import test_utils
label_desc: Use image node_id 9 for calling a global function with example usage: test_reduction_2d_tensor_return_input_node() without return types