code: def default_options_for(functions, **kwargs):
      if not isinstance(functions, list):
          functions = [functions]
      return _OptionsContextManager(set(functions), **kwargs)
  
file_path: CNTK/bindings/python/cntk/default_options.py
label_desc: Use image node_id 2 for calling a global function with example usage: default_options_for(functions) and returns: _OptionsContextManager