* Dataset: Stanford Online Products, CARS196, and the CUB200-2011
* Eval:一般是Recall@K和NMI(一般用k-means聚类)(For Recall@K,Each test image (query) first retrieves K nearest neighbors from the test set and receives score 1 if an image of the same class is retrieved among the K nearest neighbors and 0 otherwise. Recall@K averages this score over all the images \cite{lifted}.NMI is normalized mutual information to evaluate the clustering result with given ground truth clustering . and denotes mutual information and entropy respectively.)
## Reference
[1]打个酱油, Deep Metric Learning, https://zhuanlan.zhihu.com/p/68200241
[2]赵赫 Mccree, Face Recognition Loss on Mnist with Pytorch, https://zhuanlan.zhihu.com/p/64427565