bennokrojer / pytorch_violet

A PyTorch implementation of VIOLET

VIOLET: End-to-End Video-Language Transformers with Masked Visual-token Modeling

A PyTorch implementation of VIOLET

Overview

VIOLET is an implementation of
"VIOLET: End-to-End Video-Language Transformers with Masked Visual-token Modeling"
Tsu-Jui Fu, Linjie Li, Zhe Gan, Kevin Lin, William Yang Wang, Lijuan Wang, and Zicheng Liu

VIOLET contains 3 components: Video Swin Transformer (VT) computes video features; Language Embedder (LE) extracts word embeddings; Cross-modal Transformer (CT) performs cross-modal fusion. To benefit from large-scale data, we incorporate 3 pretraining tasks: Masked Language Modeling (MVM) predicts the masked word tokens; Masked Visual-token Modeling (MVM) recovers the masked video patches; Visual-Text Matching (VTM) learns the alignments between video and text modality.

Requirements

This code is implemented under Python 3.8, PyTorch 1.7, and Torchvision 0.8.

• av, tqdm, cv2
• DALL-E
• transformers

Usage

Data preprocessing

As using outer datasets (cannot be shared by us), we provide preprocessing tools to extract sparse-sampled video frames into our compressed format.

cd _tools

# We use 4 frames during pretraining and 5 frames for downstream tasks
python extract_video-frame.py --path=msrvtt --sample=5 # output: msrvtt.pkl

# We use DALL-E to extract VQ tokens for MVM pretraining
wget https://cdn.openai.com/dall-e/encoder.pkl # download trained dall-e encoder
python extract_vq.py --path=msrvtt --frame=224 # output: msrvtt_vq.pkl

# We adopt file.seek() instead of loading entire data to reduce the memory cost during distributed pretraining
python extract_tsv.py --path=msrvtt # output: msrvtt.tsv, msrvtt.lineidx

There are parital examples (WebVid2.5M, CC3M, TGIF-Action, MSVD-QA, and MSRVTT-Retrieval) to help formulate the input data.

Pretraining

Put pretrained VT in ./_snapshot. This script pretrains on both video (WebVid2.5M) and image (CC3M) data via single-node multi-gpu distributed training.

CUDA_VISIBLE_DEVICES='0,1,2,3' python -m torch.distributed.launch --nproc_per_node=4 --master_port=7122 main_pretrain.py

Here is our best pretrained checkpoint (YT180M+WebVid2.5M+CC3M).

Downstream

• Multiple-Choice Question Answering (TGIF-Action, TGIF-Transition, MSRVTT-MC, and LSMDC-MC)

CUDA_VISIBLE_DEVICES='0,1,2,3' python main_qamc.py _data/args_tgif-action.json

• Open-Ended Question Answering (TGIF-Frame, MSRVTT-QA, LSMDC-FiB, and MSVD-QA)

CUDA_VISIBLE_DEVICES='0,1,2,3' python main_qaoe.py _data/args_msvd-qa.json

• Text-to-Video Retrieval (MSRVTT, DiDeMo, YouCook2, and LSMDC)

CUDA_VISIBLE_DEVICES='0,1,2,3' python main_retrieval.py _data/args_msrvtt-retrieval.json
CUDA_VISIBLE_DEVICES='0,1,2,3' python eval_retrieval.py _data/args_msrvtt-retrieval.json

We also provide all trained downstream checkpoints.

Citation

@inproceedings{fu2021violet, 
  author = {Tsu-Jui Fu, Linjie Li, Zhe Gan, Kevin Lin, William Yang Wang, Lijuan Wang, and Zicheng Liu}, 
  title = {VIOLET: End-to-End Video-Language Transformers with Masked Visual-token Modeling}, 
  booktitle = {arXiv:2111.1268}, 
  year = {2021} 
}