code: def test_neural_network_formulations():
      _test_run_notebook(
          "neuralnet", "neural_network_formulations.ipynb", 21
      )
  
file_path: OMLT/tests/notebooks/test_run_notebooks.py
imports: import os
  import pytest
  from pyomo.common.fileutils import this_file_dir
  from testbook import testbook
  from omlt.dependencies import keras_available, onnx_available
label_desc: Use image node_id 8 for calling a global function with example usage: test_neural_network_formulations() without return types