By Jie Shao*, Xin Wen*, Bingchen Zhao and Xiangyang Xue (*: equal contribution)

This is the official PyTorch implementation of the paper "Temporal Context Aggregation for Video Retrieval with Contrastive Learning".

In this paper, we propose TCA (Temporal Context Aggregation for Video Retrieval), a video representation learning framework that incorporates long-range temporal information between frame-level features using the self-attention mechanism.

To train it on video retrieval datasets, we propose a supervised contrastive learning method that performs automatic hard negative mining and utilizes the memory bank mechanism to increase the capacity of negative samples.

The proposed method shows a significant performance advantage (∼17% mAP on FIVR-200K) over state-of-the-art methods with video-level features, and deliver competitive results with 22x faster inference time comparing with frame-level features.

Currently, we only tested the code compacity with the following dependencies:

• Python 3.7
• PyTorch == 1.4.0
• Torchvision == 0.5.0
• CUDA == 10.1
• Other dependencies

• Clone this repo:

git clone https://github.com/xwen99/temporal_context_aggregation.git
cd temporal_context_aggregation

• Install the dependencies:

pip install -r requirements.txt

• Please follow the instructions in the pre-processing folder.

• Example training script on the VCDB dataset on an 8-gpu machine:

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 horovodrun -np 8 -H localhost:8 \
python train.py \
--annotation_path datasets/vcdb.pickle \
--feature_path PATH/TO/YOUR/DATASET \
--model_path PATH/TO/YOUR/MODEL \
--num_clusters 256 \
--num_layers 1 \
--output_dim 1024 \
--normalize_input \
--neg_num 16 \
--epochs 40 \
--batch_sz 64 \
--learning_rate 1e-5 \
--momentum 0.9 \
--weight_decay 1e-4 \
--pca_components 1024 \
--padding_size 300 \
--num_readers 32 \
--num_workers 1 \
--moco_k 4096 \
--moco_m 0. \
--moco_t 1.0 \
--print-freq 1 \
--use-adasum \
--fp16-allreduce \

• Example evaluation script on the FIVR-5K dataset:

python3 evaluation.py \
--dataset FIVR-5K \
--pca_components 1024 \
--num_clusters 256 \
--num_layers 1 \
--output_dim 1024 \
--padding_size 300 \
--metric cosine \
--model_path PATH/TO/YOUR/MODEL \
--feature_path PATH/TO/YOUR/DATASET \

Our codebase builds upon several existing publicly available codes. Specifically, we have modified and integrated the following repos into this project:

• https://github.com/facebookresearch/moco
• https://github.com/MKLab-ITI/visil

@InProceedings{Shao_2021_WACV,
    author    = {Shao, Jie and Wen, Xin and Zhao, Bingchen and Xue, Xiangyang},
    title     = {Temporal Context Aggregation for Video Retrieval With Contrastive Learning},
    booktitle = {Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision (WACV)},
    month     = {January},
    year      = {2021},
    pages     = {3268-3278}
}

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

Xin Wen: [email protected]