To run this code, you should do the follow things:

1.Download mat-convnet, which is matlab deep learning lib. After that, you should complie it and add path to you project.

2.Extract deep feature,here you can use caffe ,tensorflow and theano etc. with pretrained model to extract feature.

3.Run construct_s.py to construct similarity matrix and some parameters should change in code.You can download cifar-10.mat training data and cifar_KNN.npz from here .

4.Run DDH.m to train network , which will output map and hash codes.