code: def __new__(cls, *args, **kwargs):
      # as singleton
      if cls._instance is None:
          cls._instance = super(AudioUtilsBackendManager, cls).__new__(
              cls, *args, **kwargs
          )
          cls._loaded = False
  
      return cls._instance
  
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 1 for calling the AudioUtilsBackendManager obj's underlying member method code with example usage: obj.__new__(cls) and returns: cls