解决opencv错误AttributeError: module 'cv2.cv2' has no attribute 'xfeatures2d'

一、错误原因

这个错误是由于opencv-contrib-python版本太新导致出现的问题，应该降低版本

二、解决方法

1. 卸载opencv-contrib-python

pip uninstall opencv-contrib-python

2. 安装指定的opencv-contrib-python版本

pip install opencv-contrib-python==3.3.0.10

Reference：
https://github.com/csm-kr/dog_classifier_for_identification/issues/1

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