${current_path}/
└── refer_youtube_vos/ 
    ├── train/
    │   ├── JPEGImages/
    │   │   └── */ (video folders)
    │   │       └── *.jpg (frame image files) 
    │   └── Annotations/
    │       └── */ (video folders)
    │           └── *.png (mask annotation files) 
    ├── valid/
    │   └── JPEGImages/
    │       └── */ (video folders)
    │           └── *.jpg (frame image files) 
    └── meta_expressions/
        ├── train/
        │   └── meta_expressions.json  (text annotations)
        └── valid/
            └── meta_expressions.json  (text annotations)

@misc{gavrilyuk2018actor,
      title={Actor and Action Video Segmentation from a Sentence}, 
      author={Kirill Gavrilyuk and Amir Ghodrati and Zhenyang Li and Cees G. M. Snoek},
      year={2018},
      eprint={1803.07485},
      archivePrefix={arXiv},
      primaryClass={cs.CV}
}

${current_path}/
└── a2d_sentences/ 
    ├── Release/
    │   ├── videoset.csv  (videos metadata file)
    │   └── CLIPS320/
    │       └── *.mp4     (video files)
    └── text_annotations/
        ├── a2d_annotation.txt  (actual text annotations)
        ├── a2d_missed_videos.txt
        └── a2d_annotation_with_instances/ 
            └── */ (video folders)
                └── *.h5 (annotations files) 

@inproceedings{YaXuCaCVPR2017,
  author = {Yan, Y. and Xu, C. and Cai, D. and {\bf Corso}, {\bf J. J.}},
  booktitle = {{Proceedings of IEEE Conference on Computer Vision and Pattern Recognition}},
  tags = {computer vision, activity recognition, video understanding, semantic segmentation},
  title = {Weakly Supervised Actor-Action Segmentation via Robust Multi-Task Ranking},
  year = {2017}
}
@inproceedings{XuCoCVPR2016,
  author = {Xu, C. and {\bf Corso}, {\bf J. J.}},
  booktitle = {{Proceedings of IEEE Conference on Computer Vision and Pattern Recognition}},
  datadownload = {http://web.eecs.umich.edu/~jjcorso/r/a2d},
  tags = {computer vision, activity recognition, video understanding, semantic segmentation},
  title = {Actor-Action Semantic Segmentation with Grouping-Process Models},
  year = {2016}
}
@inproceedings{XuHsXiCVPR2015,
  author = {Xu, C. and Hsieh, S.-H. and Xiong, C. and {\bf Corso}, {\bf J. J.}},
  booktitle = {{Proceedings of IEEE Conference on Computer Vision and Pattern Recognition}},
  datadownload = {http://web.eecs.umich.edu/~jjcorso/r/a2d},
  poster = {http://web.eecs.umich.edu/~jjcorso/pubs/xu_corso_CVPR2015_A2D_poster.pdf},
  tags = {computer vision, activity recognition, video understanding, semantic segmentation},
  title = {Can Humans Fly? {Action} Understanding with Multiple Classes of Actors},
  url = {http://web.eecs.umich.edu/~jjcorso/pubs/xu_corso_CVPR2015_A2D.pdf},
  year = {2015}
}

${current_path}/
└── jhmdb_sentences/ 
    ├── Rename_Images/  (frame images)
    │   └── */ (action dirs)
    ├── puppet_mask/  (mask annotations)
    │   └── */ (action dirs)
    └── jhmdb_annotation.txt  (text annotations)

@inproceedings{Jhuang:ICCV:2013,
title = {Towards understanding action recognition},
author = {H. Jhuang and J. Gall and S. Zuffi and C. Schmid and M. J. Black},
booktitle = {International Conf. on Computer Vision (ICCV)},
month = Dec,
pages = {3192-3199},
year = {2013}
}