Add several person retrieval papers.

Dear author, 

Thank you for your great collection.
I add several my papers about person re-identification into your list, which is a subtask of image retrieval.
Hope they are good to be merged in your list. Thanks a lot.

README.md

@@ -4,6 +4,7 @@
 
 - [Local Features and Visual Words Emerge in Activations](https://avrithis.net/data/pub/pdf/conf/C110.cvpr19.spatial.pdf).
 - [Explicit Spatial Encoding for Deep Local Descriptors](https://arxiv.org/abs/1904.07190).
+- [Joint Discriminative and Generative Learning for Person Re-identification](https://arxiv.org/abs/1904.07223) (Oral)[[Project]](http://zdzheng.xyz/DG-Net/) [[YouTube]](https://www.youtube.com/watch?v=ubCrEAIpQs4) [[Bilibili]](https://www.bilibili.com/video/av51439240) [[Poster]](http://zdzheng.xyz/images/DGNet_poster.pdf)
 
 ### ARXIV
 
@@ -59,6 +60,8 @@
 - [Regional Attention Based Deep Feature for Image Retrieval](https://sglab.kaist.ac.kr/RegionalAttention/), [code](https://github.com/jaeyoon1603/Retrieval-RegionalAttention), BMVC 2018.
 - [Detect-to-Retrieve: Efficient Regional Aggregation for Image Search](https://arxiv.org/pdf/1812.01584.pdf), arxiv.
 - [Revisiting Oxford and Paris: Large-Scale Image Retrieval Benchmarking](http://cmp.felk.cvut.cz/~toliageo/p/RadenovicIscenToliasAvrithisChum_CVPR2018_Revisiting%20Oxford%20and%20Paris:%20Large-Scale%20Image%20Retrieval%20Benchmarking.pdf), [project](http://cmp.felk.cvut.cz/revisitop/), CVPR 2018
+- [A Discriminatively Learned CNN Embedding for Person Re-identification](https://github.com/layumi/2016_person_re-ID),TOMM2017 
+- [Unlabeled samples generated by gan improve the person re-identification baseline in vitro](https://github.com/layumi/Person-reID_GAN), ICCV2019 Spotlight
 
 #### Deep Learning Feature (Local Feature)
 
@@ -72,6 +75,7 @@
 - [GeoDesc: Learning Local Descriptors by Integrating Geometry Constraints](https://arxiv.org/pdf/1807.06294.pdf), [code](https://github.com/lzx551402/geodesc), ECCV 2018.
 - [Learning local feature descriptors with triplets and shallow convolutional neural networks](https://github.com/vbalnt/tfeat), BMVC 2016.
 - [SOSNet: Second Order Similarity Regularization for Local Descriptor Learning](https://github.com/scape-research/SOSNet), CVPR 2019.
+- [Pedestrian Alignment Network for Large-scale Person Re-identification](https://ieeexplore.ieee.org/document/8481710), TCSVT2018.
 
 #### ANN search
 
@@ -143,6 +147,7 @@
 #### Semantic Matching
 
 - [End-to-end weakly-supervised semantic alignment](https://github.com/ignacio-rocco/weakalign)
+- [Dual-Path Convolutional Image-Text Embedding](https://github.com/layumi/Image-Text-Embedding)
 
 ### Image Identification