我需要保存sift_object并重新加载，但是joblib库出现错误
>>> sift = cv.xfeatures2d.SIFT_create()
>>> joblib.dump(sift, 'output/sift_model')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/phvien/PycharmProjects/leaf-disease-detection/venv/lib/python3.6/site-packages/joblib/numpy_pickle.py", line 502, in dump
NumpyPickler(f, protocol=protocol).dump(value)
File "/usr/lib/python3.6/pickle.py", line 409, in dump
self.save(obj)
File "/home/phvien/PycharmProjects/leaf-disease-detection/venv/lib/python3.6/site-packages/joblib/numpy_pickle.py", line 292, in save
return Pickler.save(self, obj)
File "/usr/lib/python3.6/pickle.py", line 496, in save
rv = reduce(self.proto)
TypeError: can't pickle cv2.xfeatures2d_SIFT objects