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DeepLabv3.pytorch

This is a PyTorch implementation of DeepLabv3 that aims to reuse the resnet implementation in torchvision as much as possible. This means we use the PyTorch model checkpoint when finetuning from ImageNet, instead of the one provided in TensorFlow.

We try to match every detail in DeepLabv3, except that Multi-Grid other than (1, 1, 1) is not yet supported. On PASCAL VOC 2012 validation set, using the same hyperparameters, we reproduce the performance reported in the paper (GPU with 16GB memory is required). We also support the combination of Group Normalization + Weight Standardization:

Implementation Normalization Multi-Grid ASPP Image Pooling mIOU
Paper BN (1, 2, 4) (6, 12, 18) Yes 77.21
Ours BN (1, 1, 1) (6, 12, 18) Yes 76.49
Ours GN+WS (1, 1, 1) (6, 12, 18) Yes 77.20

To run the BN experiment, after preparing the dataset as follows, simply run:

python main.py --train --exp bn_lr7e-3 --epochs 50 --base_lr 0.007

To test the trained model, use the same command except delete --train. To use our trained model (76.49):

wget https://cs.jhu.edu/~cxliu/data/deeplab_resnet101_pascal_v3_bn_lr7e-3_epoch50.pth -P data/

To run the GN+WS experiment, begin by downloading the GN+WS ResNet101 trained on ImageNet:

wget https://cs.jhu.edu/~syqiao/WeightStandardization/R-101-GN-WS.pth.tar -P data/
python main.py --train --exp gn_ws_lr7e-3 --epochs 50 --base_lr 0.007 --groups 32 --weight_std

Again, to test the trained model, use the same command except delete --train. To use our trained model (77.20):

wget https://cs.jhu.edu/~cxliu/data/deeplab_resnet101_pascal_v3_gn_ws_lr7e-3_epoch50.pth -P data/

Prepare PASCAL VOC 2012 Dataset

mkdir data
cd data
wget http://host.robots.ox.ac.uk/pascal/VOC/voc2012/VOCtrainval_11-May-2012.tar
tar -xf VOCtrainval_11-May-2012.tar
cd VOCdevkit/VOC2012/
wget http://cs.jhu.edu/~cxliu/data/SegmentationClassAug.zip
wget http://cs.jhu.edu/~cxliu/data/SegmentationClassAug_Visualization.zip
wget http://cs.jhu.edu/~cxliu/data/list.zip
unzip SegmentationClassAug.zip
unzip SegmentationClassAug_Visualization.zip
unzip list.zip

Prepare Cityscapes Dataset

unzip leftImg8bit_trainvaltest.zip
unzip gtFine_trainvaltest.zip
git clone https://github.com/mcordts/cityscapesScripts.git
mv cityscapesScripts/cityscapesscripts ./
rm -rf cityscapesScripts
python cityscapesscripts/preparation/createTrainIdLabelImgs.py