code: def get_available_backends(self):
      return [
          key
          for key, value in self._subclasses.items()
          if value is not 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 10 for calling the ImageUtilsBackend obj's underlying member method code with example usage: obj.get_available_backends() and returns: unknown