Based on Faster RCNN, the repository aims to reproduce the ImageNet Detection results in ResNet paper (Deep Residual Learning for Image Recognition).

So far, it achieves mAP 52.2% (vs. 60.5% in the paper) on val2 of ImageNet 2015 Detection dataset without the use of Box refinement, Global context and Multi-scale testing.

If you have any questions about this code, please create an issue.

• Add ImageNet Detection imdb and roidb
• Use ResNet-101
• Multi-gpus training and testing
• Fix some problems when training Faster RCNN over ImageNet

• Box refinement
• Global context
• Multi-scale testing

If you are interested in these, please feel free to submit PRs.

If you find any directory in the following steps does not exist, please create it by yourself.

• Clone this repository and set up the environment as described in the original README.md of Faster RCNN

• Download the models I trained. Populate them into output/faster_rcnn_alt_opt/imagenet_2015_trainval1_woextra.

  resnet-101_rpn_stage1_iter_320000.caffemodel

  resnet-101_fast_rcnn_stage1_iter_320000.caffemodel

• Generate RPN proposals

  python tools/rpn_generate.py --def models/imagenet/ResNet-101/faster_rcnn_alt_opt/rpn_test.pt --net output/faster_rcnn_alt_opt/imagenet_2015_trainval1_woextra/resnet-101_rpn_stage1_iter_320000.caffemodel --imdb imagenet_2015_val2 --gpu 0 1 2 3

• Use Fast RCNN to detect objects with these proposals generated by RPN

  ./tools/test_net.py --gpu 0 1 2 3 --def models/imagenet/ResNet-101/fast_rcnn/test.prototxt --net output/faster_rcnn_alt_opt/imagenet_2015_trainval1_woextra/resnet-101_fast_rcnn_stage1_iter_320000.caffemodel --imdb imagenet_2015_val2 --cfg experiments/cfgs/fast_rcnn.yml --rpn_file output/default/imagenet_2015_val2/resnet-101_rpn_stage1_iter_320000/proposals_test

Once it finishes, you could see the final mAP over val2.

Hardware required: 4 or 8 GPU cards are required to train the model because the batch sizes used in the original paper are 8 for RPN and 16 for Fast RCNN.

Please note: because the improvement of stage 3 and 4 is minior, only the first two stages are trained. With 8 Titanx GPU cards, it takes about four days to train.

• Download ImageNet Detection 2015 datasets, and unzip it into directory data. It should have this basic structure

  ImageNet2015/Annotations
  ImageNet2015/Data
  ImageNet2015/ImageSets
  # others...

• Run cp trainval1_woextra.txt val2.txt data/ImageNet2015/ImageSets/DET

• Download the pretranied model of ResNet-101 here, and populate it into data/imagenet_models with name ResNet-101.caffemodel

• Run experiments/scripts/faster_rcnn_alt_opt.sh 0,1,2,3,4,5,6,7 ResNet-101 imagenet to train. 0,1,2,3,4,5,6,7 is GPU ids. Please replace it if you use other GPUs.