ONNX推理报错：不能导入模块

在仿照深入解析AI开发流程页面的例程时，在6.3.1.2.6节输入指令报错
yuamo@yuamo-virtual-machine:~/K230_AI_Demo_Development_Process_Analysis/onnx_related/onnx_inference/face_detection$ python3 face_detector.py
Traceback (most recent call last):
File "face_detector.py", line 8, in
from prior_box import PriorBox
File "/home/yuamo/K230_AI_Demo_Development_Process_Analysis/onnx_related/onnx_inference/face_detection/prior_box.py", line 4, in
from data import cfg_mnet
ImportError: cannot import name 'cfg_mnet' from 'data' (/home/yuamo/.local/lib/python3.8/site-packages/data/init.py)
这个问题该如何解决呢