argman / DenseNet

Code for Densely Connected Convolutional Networks (DenseNet)

#Densely Connected Convolutional Networks (DenseNets) This repository contains the code for the paper Densely Connected Convolutional Network.

The code is based on Facebook's implementation of ResNet (https://github.com/facebook/fb.resnet.torch).

Also, see our [Caffe Implementation] (https://github.com/liuzhuang13/DenseNetCaffe).

If you find this helps your research, please consider citing:

 @article{Huang2016Densely,
 		author = {Huang, Gao and Liu, Zhuang and Weinberger, Kilian Q.},
 		title = {Densely Connected Convolutional Networks},
 		journal = {arXiv preprint arXiv:1608.06993},
 		year = {2016}
 }

##Table of Contents 0. Introduction 0. Results 0. Usage 0. Contact

##Introduction DenseNet is a network architecture where each layer is directly connected to every other layer in a feed-forward fashion (within each dense block). For each layer, the feature maps of all preceding layers are treated as separate inputs whereas its own feature maps are passed on as inputs to all subsequent layers. This connectivity pattern yields state-of-the-art accuracies on CIFAR10/100 (with or without data augmentation) and SVHN.

Figure 1: A dense block with 5 layers and growth rate 4.

Figure 2: A deep DenseNet with three dense blocks.

##Results The table below shows the results of DenseNets on CIFAR datasets. The "+" mark at the end denotes standard data augmentation (crop after zero-padding, and horizontal flip). For a DenseNet model, L denotes its depth and k denotes its growth rate. On CIFAR-10 and CIFAR-100 (without augmentation), Dropout with 0.2 drop rate is adopted.

Method	CIFAR-10	CIFAR-10+	CIFAR-100	CIFAR-100+
DenseNet (L=40, k=12)	7.00	5.24	27.55	24.42
DenseNet (L=100, k=12)	5.77	4.10	23.79	20.20
DenseNet (L=100, k=24)	5.83	3.74	23.42	19.25

We're experimenting on ImageNet dataset, some preliminary results and pretrained models are coming out soon.

##Usage 0. Install Torch ResNet (https://github.com/facebook/fb.resnet.torch) following the instructions there. To reduce memory consumption, we recommend to install the optnet package.

1. Add the file densenet.lua to the folder models/.
2. Change the learning rate schedule in the file train.lua: inside function learningRate(), change line 171/173 from decay = epoch >= 122 and 2 or epoch >= 81 and 1 or 0 to decay = epoch >= 225 and 2 or epoch >= 150 and 1 or 0
3. Train a DenseNet (L=40, k=12) on CIFAR-10+ using

th main.lua -netType densenet -depth 40 -dataset cifar10 -batchSize 64 -nEpochs 300 -optnet true

In our experiment environment (cudnn v5.1, one TITAN X GPU), this takes about 7 hours to finish

###Note By default, the growth rate k is set to 12, dropout is disabled. To experiment with other settings, please change densenet.lua accordingly (see the comments in the code).

##Contact liuzhuangthu at gmail.com
gh349 at cornell.edu
Any discussions, suggestions and questions are welcome!