code: def get_accelerator(self):
      if self.onnxruntime:
          return "onnxruntime"
      if self.openvino:
          return "openvino"
      if self.jit:
          return "jit"
      return None
  
file_path: BigDL/python/nano/src/bigdl/nano/utils/common/optimizer/acceleration_option.py
imports: from abc import abstractmethod
  from typing import Optional, List, Set, Dict
  from bigdl.nano.utils.common import _inc_checker, _ipex_checker, _onnxruntime_checker, _openvino_checker
label_desc: Use image node_id 3 for calling the AccelerationOption obj's underlying member method code with example usage: obj.get_accelerator() and returns: None, str, str, str