code: def configuration(parent_package="", top_path=None):
      config = Configuration("tree", parent_package, top_path)
  
      # submodules which do not have their own setup.py
      config.add_subpackage("splitter")
      config.add_subpackage("nodes")
      config.add_subpackage("split_criterion")
  
      return config
  
label_desc: Use image node_id 1 for calling a global function with example usage: configuration(parent_package, top_path) and returns: config