code: def backend(self):
      return self._backend
  
file_path: nnabla/python/src/nnabla/utils/audio_utils/backend_manager.py
imports: import importlib
  from collections import OrderedDict
label_desc: Use image node_id 6 for calling the AudioUtilsBackendManager obj's underlying member method code with example usage: obj.backend() and returns: self