code: def set_backend(self, name):
      if name in self._subclasses:
          self._default_backend = self._subclasses[name]
      else:
          self._default_backend = None
  
file_path: nnabla/python/src/nnabla/utils/image_utils/backend_events/image_utils_backend.py
imports: from collections import OrderedDict
label_desc: Use image node_id 9 for calling the ImageUtilsBackend obj's underlying member method code with example usage: obj.set_backend(name) without return types