3D ResNets for Action Recognition

This is the torch code for the following paper:

Kensho Hara, Hirokatsu Kataoka, and Yutaka Satoh,
"Learning Spatio-Temporal Features with 3D Residual Networks for Action Recognition",
arXiv preprint, arXiv:1708.07632, 2017.

The paper will appear in ICCV 2017 Workshop (Chalearn).

This code includes only training and testing on the ActivityNet and Kinetics datasets.
If you want to classify your videos using our pretrained models, use this code.

Citation

If you use this code or pre-trained models, please cite the following:

@article{hara3dresnets
  author={Kensho Hara and Hirokatsu Kataoka and Yutaka Satoh}
  title={Learning Spatio-Temporal Features with 3D Residual Networks for Action Recognition}
  journal={arXiv preprint}
  volume={arXiv:1708.07632}
  year={2017}
}

Pre-trained models

Pre-trained models are available at releases.

Requirements

• Torch

git clone https://github.com/torch/distro.git ~/torch --recursive
cd ~/torch; bash install-deps;
./install.sh

• json package

luarocks install json

• FFmpeg, FFprobe

wget http://johnvansickle.com/ffmpeg/releases/ffmpeg-release-64bit-static.tar.xz
tar xvf ffmpeg-release-64bit-static.tar.xz
cd ./ffmpeg-3.3.3-64bit-static/; sudo cp ffmpeg ffprobe /usr/local/bin;

• Python 3

Preparation

ActivityNet

• Download datasets using official crawler codes
• Convert from avi to jpg files using utils/video_jpg.py

python utils/video_jpg.py avi_video_directory jpg_video_directory

• Generate fps files using utils/fps.py

python utils/fps.py avi_video_directory jpg_video_directory

Kinetics

• Download datasets using official crawler codes
  • Locate test set in video_directory/test.
• Convert from avi to jpg files using utils/video_jpg_kinetics.py

python utils/video_jpg_kinetics.py avi_video_directory jpg_video_directory

• Generate n_frames files using utils/n_frames_kinetics.py

python utils/n_frames_kinetics.py jpg_video_directory

• Generate annotation file in json format similar to ActivityNet using utils/kinetics_json.py

python utils/kinetics_json.py train_csv_path val_csv_path test_csv_path json_path

Running the code

Assume the structure of data directories is the following:

~/
  data/
    activitynet_videos/
      jpg/
        .../ (directories of video names)
          ... (jpg files)
    kinetics_videos/
      jpg/
        .../ (directories of class names)
          .../ (directories of video names)
            ... (jpg files)
    models/
      resnet.t7
    results/
      model_100.t7
    LR/
      ActivityNet/
        lr.lua
      Kinetics/
        lr.lua
    kinetics.json
    activitynet.json

Confirm all options.

th main.lua -h

Train ResNets-34 on the Kinetics dataset (400 classes) with 4 CPU threads (for data loading) and 2 GPUs.
Batch size is 128.
Save models at every 5 epochs.

th main.lua --root_path ~/data --video_path kinetics_videos/jpg --annotation_path kinetics.json \
--result_path results --lr_path LR/Kinetics/lr.lua --dataset kinetics --model resnet \
--resnet_depth 34 --n_classes 400 --batch_size 128 --n_gpu 2 --n_threads 4 --checkpoint 5

Continue Training from epoch 101. (~/data/results/model_100.t7 is loaded.)

th main.lua --root_path ~/data --video_path kinetics_videos/jpg --annotation_path kinetics.json \
--result_path results --lr_path LR/Kinetics/lr.lua --dataset kinetics --begin_epoch 101 \
--batch_size 128 --n_gpu 2 --n_threads 4 --checkpoint 5

Perform recognition for each video of validation set using pretrained model. This operation outputs top-10 labels for each video.

th main.lua --root_path ~/data --video_path kinetics_videos/jpg --annotation_path kinetics.json \
--result_path results --premodel_path models/resnet.t7 --dataset kinetics \
--no_train --no_val --test_video --test_subset val --n_gpu 2 --n_threads 4