sift:
https://blog.csdn.net/weixin_38404120/article/details/73740612
https://blog.csdn.net/abcjennifer/article/details/7639681/
https://www.cnblogs.com/my-love-is-python/p/10414135.html
https://blog.csdn.net/qq_29796317/article/details/53574940
https://www.cnblogs.com/ronny/p/4028776.html
https://blog.csdn.net/w5688414/article/details/77886744
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