contrastive loss function (papers)

1.Learning a Similarity Metric Discriminatively, with Application to Face Verification
2,Dimensionality Reduction by Learning an Invariant Mapping
3.Signature Verification using a “Siamese”Time Delay Neural Network
4.Deep Metric Learning for Practical Person Re-Identification
5、Deep Metric Learning for Person Re-Identification
6、Are Loss Functions All the Same?