code: def test_graph_basics():
      input_node = ak.Input(shape=(30,))
      output_node = input_node
      output_node = ak.DenseBlock()(output_node)
      output_node = ak.RegressionHead(shape=(1,))(output_node)
  
      model = graph_module.Graph(
          inputs=input_node, outputs=output_node
      ).build(keras_tuner.HyperParameters())
      assert model.input_shape == (None, 30)
      assert model.output_shape == (None, 1)
  
file_path: autokeras/autokeras/graph_test.py
imports: import os
  import keras_tuner
  import pytest
  import autokeras
  from autokeras import graph
label_desc: Use image node_id 4 for calling a global function with example usage: test_graph_basics() without return types