code: def _test_onnx():
      file = os.path.join(test_data_dir, "onnx", "candy.onnx")
      onnx = __import__("onnx")
      model = onnx.load(file)
      netron.serve(None, model)
  
file_path: netron/test/backend.py
imports: import os
  import sys
label_desc: Use image node_id 1 for calling a global function with example usage: _test_onnx() without return types