code: def get_model_url_base():
      """
      Returns a root folder for models.
      """
      url_base = get_model_url_base_from_env()
      if url_base is not None:
          logger.info(
              "NNBLA_MODELS_URL_BASE is set as {}.".format(url_base)
          )
      else:
          url_base = "https://nnabla.org/pretrained-models/nnp_models/"
      return url_base
  
imports: from __future__ import absolute_import
  import os
  from nnabla import logger
  from nnabla.utils.download import get_data_home
label_desc: Use image node_id 3 for calling a global function with example usage: get_model_url_base() and returns: url_base