DnS: Distill-and-Select for Efficient and Accurate Video Indexing and Retrieval

This repository contains the PyTorch implementation of the paper DnS: Distill-and-Select for Efficient and Accurate Video Indexing and Retrieval. It provides code for the knowledge distillation training of coarse- and fine-grained student networks based on similarities calculated from a teacher and the selector network. Also, the scripts for the training of the selector network are included. Finally, to facilitate the reproduction of the paper's results, the evaluation code, the extracted features for the employed video datasets, and pre-trained networks for the various students and selectors are available.

Prerequisites

• Python 3
• PyTorch >= 1.1
• Torchvision >= 0.4

Preparation

Installation

• Clone this repo:

  git clone https://github.com/mever-team/distill-and-select
  cd distill-and-select

• You can install all the dependencies by

  pip install -r requirements.txt

  or

  conda install --file requirements.txt

Feature files

• We provide our extracted features for all datasets to facilitate reproducibility for future research.

• Download the feature files of the dataset you want:

  • DnS-100K (219 GB)
  • FIVR-200K (406 GB), FIVR-5K (8.7 GB)
  • CC_WEB_VIDEO (31 GB)
  • SVD (150 GB)
  • EVVE (9 GB)
  • VCDB (118 GB)

• All feature files are in HDF5 format

Distillation

We provide the code for training and evaluation of our student models.

Student training

• To train a fine-grained student, run the train_student.py given fine-grained as value to the --student_type argument, as in the following command:

  python train_student.py --student_type fine-grained --experiment_path experiments/DnS_students --trainset_hdf5 /path/to/dns_100k.hdf5

• You can train an attention or binarization fine-grained students by setting either the --attention or --binarization flags to true, respectively.

For fine-grained attention students:

python train_student.py --student_type fine-grained --binarization false --attention true --experiment_path /path/to/experiment/ --trainset_hdf5 /path/to/dns_100k.hdf5

For fine-grained binarization students:

python train_student.py --student_type fine-grained --binarization true --attention false --experiment_path /path/to/experiment/ --trainset_hdf5 /path/to/dns_100k.hdf5

• To train a coarse-grained students, provide coarse-grained to the --student_type argument:

  python train_student.py --student_type coarse-grained --experiment_path /path/to/experiment/ --trainset_hdf5 /path/to/dns_100k.hdf5 --attention true --learning_rate 1e-5

• Provide one of the teacher, fg_att_student_iter1, fg_att_student_iter2 to the --teacher argument in odrder to train a student with a different teacher:

  python train_student.py --teacher fg_att_student_iter2 --experiment_path /path/to/experiment/ --trainset_hdf5 /path/to/dns_100k.hdf5

• You can optionally perform validation with FIVR-5K by providing its HDF5 file to the --val_hdf5 and choosing one of the DSVR, CSVR, ISVR sets with the --val_set argument:

  python train_student.py --student_type coarse-grained --val_hdf5 /path/to/fivr_5k.hdf5 --val_set ISVR --experiment_path /path/to/experiment/ --trainset_hdf5 /path/to/dns_100k.hdf5 --learning_rate 1e-5

  Student Evaluation

• Choose one of the FIVR-5K, FIVR-200K, CC_WEB_VIDEO, SVD, or EVVE datasets to evaluate your models.

• For the evaluation of the students, run the evaluation_student.py script by providing the path to the .pth model to the --student_path argument, as in the following command:

  python evaluation_student.py --student_path experiments/DnS_students/model_fg_att_student.pth --dataset FIVR-5K --dataset_hdf5 /path/to/fivr_200k.hdf5

• If you don't pass any value to the --student_path, a pretrained model will be selected:

  python evaluation_student.py --student_type fine-grained --attention true --dataset FIVR-5K --dataset_hdf5 /path/to/fivr_200k.hdf5

Selection

We also provide the code for training of the selector network and the evaluation of our overall DnS framework.

Selector training

• To train a selector network, run the train_selector.py as in the following command:

  python train_selector.py --experiment_path experiments/DnS_students --trainset_hdf5 /path/to/dns_100k.hdf5

• Provide different values to --threshold argument to train the selector network with different label functions.

DnS Evaluation

• For the evaluation of the DnS framework, run the evaluation_dns.py script by providing the path to the .pth model to the corresponding network arguments, as in the following command:

  python evaluation_dns.py --selector_network_path experiments/DnS_students/model_selector_network.pth --dataset FIVR-5K --dataset_hdf5 /path/to/fivr_200k.hdf5

• If you don't pass any value to the network path argument, then the pretrained model will be selected. E.g. to evalute DnS with the Fine-grained Attention Student:

  python evaluation_dns.py --attention true --dataset FIVR-5K --dataset_hdf5 /path/to/fivr_200k.hdf5

• Provide different values to --percentage argument to sent different number of video pairs for reranking to the Fine-grained student. Given the value all, it runs evaluation for all dataset percentages.

Use our pretrained models

We also provide our pretrained models trained with the fg_att_student_iter2 teacher.

• Load our pretrained models as follows:

  
  from model.feature_extractor import FeatureExtractor
  from model.students import FineGrainedStudent, CoarseGrainedStudent
  from model.selector import SelectorNetwork

The feature extraction network used in out experiments

feature_extractor = FeatureExtractor(dims=512).eval()

Our Fine-grained Students

fg_att_student = FineGrainedStudent(pretrained=True, attention=True).eval() fg_bin_student = FineGrainedStudent(pretrained=True, binarization=True).eval()

Our Coarse-grained Students

cg_student = CoarseGrainedStudent(pretrained=True).eval()

Our Selector Networks

selector_att = SelectorNetwork(pretrained=True, attention=True).eval() selector_bin = SelectorNetwork(pretrained=True, binarization=True).eval()

* First, extract video features by providing a video tensor to feature extractor (similar as [here](https://github.com/MKLab-ITI/visil/tree/pytorch#use-visil-in-your-python-code))
```python
video_features = feature_extractor(video_tensor)

• Use the index_video() function providing video features to extract video representations for the student and selector networks

  fg_features = fg_att_student.index_video(video_features)
  cg_features = cg_student.index_video(video_features)
  sn_features = selector_att.index_video(video_features)

• Use the calculate_video_similarity() function providing query and target features to calculate similarity based on the student networks.

  fine_similarity = fg_att_student.calculate_video_similarity(query_fg_features, target_fg_features)
  coarse_similarity = cg_student.calculate_video_similarity(query_cg_features, target_cg_features)

• To calculate the selector's score for a video pair, call the selector network by providing the features extracted for each video and their coarse similarity

  selector_features = torch.cat([query_sn_features, target_sn_features, coarse_similarity], 1)
  selector_scores = selector_att(selector_features)

Citation

If you use this code for your research, please consider citing our papers:

@article{kordopatis2022dns,
  title={{DnS}: {Distill-and-Select} for Efficient and Accurate Video Indexing and Retrieval},
  author={Kordopatis-Zilos, Giorgos and Tzelepis, Christos and Papadopoulos, Symeon and Kompatsiaris, Ioannis and Patras, Ioannis},
  journal={International Journal of Computer Vision},
  year={2022}
}

@inproceedings{kordopatis2019visil,
  title={{ViSiL}: Fine-grained Spatio-Temporal Video Similarity Learning},
    author={Kordopatis-Zilos, Giorgos and Papadopoulos, Symeon and Patras, Ioannis and Kompatsiaris, Ioannis},
  booktitle={Proceedings of the IEEE/CVF International Conference on Computer Vision},
  year={2019}
}

Related Projects

ViSiL - here you can find our teacher model

FIVR-200K - download our FIVR-200K dataset

Acknowledgements

This work has been supported by the projects WeVerify and MediaVerse, partially funded by the European Commission under contract number 825297 and 957252, respectively, and DECSTER funded by EPSRC under contract number EP/R025290/1.

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details

Contact for further details about the project

Giorgos Kordopatis-Zilos (georgekordopatis@iti.gr)