code: def _ensure_web_server():
      import turicreate as tc
  
      if (
          tc.config.get_runtime_config()[
              "TURI_VISUALIZATION_WEB_SERVER_ROOT_DIRECTORY"
          ]
          == ""
      ):
          path_to_client = _get_client_app_path()
          tc.config.set_runtime_config(
              "TURI_VISUALIZATION_WEB_SERVER_ROOT_DIRECTORY",
              _os.path.abspath(
                  _os.path.join(
                      _os.path.dirname(path_to_client),
                      "..",
                      "Resources",
                      "build",
                  )
              ),
          )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import json
  import os
  import sys
  from tempfile import mkstemp
  from subprocess import Popen
  from subprocess import PIPE
label_desc: Use image node_id 2 for calling a global function with example usage: _ensure_web_server() without return types