code: def merge_cfg_from_file(cfg_filename):
      """Load a yaml config file and merge it into the global config."""
      with open(cfg_filename, "r") as f:
          yaml_cfg = AttrDict(load_cfg(f))
      _merge_a_into_b(yaml_cfg, __C)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  from ast import literal_eval
  from future.utils import iteritems
  from past.builtins import basestring
  import copy
  import logging
  import numpy
  import os
  import os.path
  import yaml
  from detectron.utils.collections import AttrDict
  from detectron.utils.io import cache_url
label_desc: Use image node_id 5 for calling a global function with example usage: merge_cfg_from_file(cfg_filename) without return types