1.Triplet

https://www.jianshu.com/p/46c6f68264a1

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http://lawlite.me/2018/10/16/Triplet-Loss%E5%8E%9F%E7%90%86%E5%8F%8A%E5%85%B6%E5%AE%9E%E7%8E%B0/

https://zhuanlan.zhihu.com/p/35560666

2、表示模型

https://zhuanlan.zhihu.com/p/27441587

3、MatchPyramid

https://blog.csdn.net/coraline_m/article/details/78796786

4、Rank

http://www.cnblogs.com/kemaswill/archive/2013/06/01/3109497.html

5、PQ(product quantization)

https://blog.csdn.net/u010368556/article/details/80960510

https://github.com/facebookresearch/faiss/wiki

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