Hard negative examples are hard, but useful

Benchmark Model Rank Results
metric-learning-on-cars196SCT(64)#32R@1: 73.2
metric-learning-on-cub-200-2011SCT(64)#23R@1: 57.7
metric-learning-on-in-shopSCT(512)#10R@1: 90
metric-learning-on-stanford-online-productsSCT(512)#12R@1: 81.6