code: def configuration(parent_package="", top_path=None):
      cblas_libs, blas_info = get_blas_info()
  
      # Use this rather than cblas_libs so we don't fail on Windows
      libraries = []
      if os.name == "posix":
          cblas_libs.append("m")
          libraries.append("m")
  
      config = Configuration("preprocessing", parent_package, top_path)
  
      config.add_subpackage("endog")
      config.add_subpackage("endog/tests")
      config.add_subpackage("exog")  # builds src and adds its own tests
  
      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