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Zero-Shot Video Question Answering via Frozen Bidirectional Language Models

Webpage • Paper

FrozenBiLM is a new model for video question answering that builds on a frozen bidirectional language model. FrozenBiLM excels in settings without any manual annotation (zero-shot) or with limited training data (few-shot), while performing competitively when trained on standard datasets (fully-supervised).

This repository provides the code for our FrozenBiLM paper (NeurIPS 2022), including:

• Environment setup
• Data downloading instructions
• Data preprocessing and visual feature extraction scripts, as well as preprocessed data and features
• Pretrained checkpoints
• Training and evaluation scripts for cross-modal training, downstream fully-supervised, few-shot and zero-shot VideoQA, including various baselines
• VideoQA demo script

Setup

To install requirements, run:

conda create -n frozenbilm_env python=3.8 
conda activate frozenbilm_env
conda install pytorch==1.8.1 torchvision==0.9.1 cudatoolkit=11.1 -c pytorch -c nvidia 
pip install -r requirements.txt

You may fill the global paths in args.py.
To use a given text-pretrained language model, you should download the corresponding weights from the Hugging Face Hub and put them in TRANSFORMERS_CACHE.

Quick Start

If you wish to start VideoQA training or inference quickly.

Download preprocessed data, visual features and checkpoints

To download pretrained checkpoints, pre-processed data, ASR and visual features, run:

bash download/download_checkpoints.sh <MODEL_DIR>
bash download/download_downstream.sh <DATA_DIR>

If you have issues with gshell, you can access the processed data here and the checkpoints here.
It requires about 8GB for the models, and 12GB for the data.
Note that most pretrained checkpoints only contain updated parameters due to storage limitations (and not the frozen parameters).
This means you have to make sure that you have properly downloaded weights from Hugging Face for the language model of your choice when using a provided checkpoint.
For completeness, frozenbilm.pth, frozenbilm_bertbase_noadapter.pth and frozenbilm_bertlarge_noadapter.pth contain all parameters.
Also note that due to storage issue, we do not host publicly visual features for the WebVid10M dataset.

Long Start

Data Downloading

LSMDC-FiB Download the annotations and videos from the dataset providers. The annotations should be in <DATA_DIR>/LSMDC.

TGIF-FrameQA Download the annotations and GIFs from the dataset providers. The annotations should be in <DATA_DIR>/TGIF-QA.

How2QA Download the annotations and videos from the dataset providers. The annotations should be in <DATA_DIR>/How2QA.

TVQA Download the annotations and videos from the dataset providers. The annotations should be in <DATA_DIR>/TVQA.

For iVQA, MSRVTT-QA, MSVD-QA and ActivityNet-QA, we use the preprocessed files from Just Ask and download them in <DATA_DIR>/iVQA, <DATA_DIR>/MSRVTT-QA, <DATA_DIR>/MSVD-QA and <DATA_DIR>/ActivityNet-QA.

To download automatic speech subtitles, we use youtube-dl, except for LSMDC, How2QA and TVQA for which the authors provide them. We then convert the vtt files for each video from a dataset to a pickle file subtitles.pkl containing a dictionary mapping each video_id to a dictionary containing a start, end and text key, corresponding to the speech in the corresponding video_id.

Annotation Preprocessing

Visual Feature extraction

Extraction You should prepare for each dataset a csv with columns video_path, and feature_path. Then use (you may launch this script on multiple GPUs to fasten the extraction process):

python extract/extract.py --csv <csv_path>

Merge files To merge the extracted features into a single file for each downstream dataset, use:

python extract/merge_features.py --folder <features_path> \
--output_path <DEFAULT_DATASET_DIR>/clipvitl14.pth --dataset <dataset>

For WebVid10M, you may let the features in separate files (one per video) as the dataset is too big for the features to be stored in a single file.
You may preferably put these features on a SSD to fasten up on-the-fly reading during training.

Available checkpoints

Note that checkpoints finetuned on 10% or 1% of downstream datasets (few-shot setting) are also made accessible here.
Variants using a BERT-Base or BERT-Large language model (without adapters) instead of DeBERTa are also present in this folder.

Cross-modal training

FrozenBiLM

To train FrozenBiLM on WebVid10M, run:

python -m torch.distributed.launch --nproc_per_node 8 --use_env main.py \
--combine_datasets webvid --combine_datasets_val webvid --save_dir=trainwebvid \
--lr=3e-5 --ds_factor_ff=8 --ds_factor_attn=8 \
--batch_size=16 --batch_size_val=16 --epochs=2 \

Baselines

Autoregressive variants

Zero-shot VideoQA

Fill-in-the-blank and open-ended VideoQA

FrozenBiLM

To evaluate the cross-modal trained FrozenBiLM on LSMDC-FiB, iVQA, MSRVTT-QA, MSVD-QA, ActivityNet-QA or TGIF-QA FrameQA, run:

python -m torch.distributed.launch --nproc_per_node 8 --use_env videoqa.py --test --eval \
--combine_datasets <dataset> --combine_datasets_val <dataset> --save_dir=zs<dataset> \
--ds_factor_ff=8 --ds_factor_attn=8 --suffix="." \
--batch_size_val=32 --max_tokens=256 --load=<CKPT_PATH> --<dataset>_vocab_path=$DATA_DIR/<dataset>/vocab1000.json

Baselines

Autoregressive variants

CLIP baseline

Multiple-choice VideoQA

FrozenBiLM

To evaluate the cross-modal trained FrozenBiLM on How2QA or TVQA, run:

python -m torch.distributed.launch --nproc_per_node 8 --use_env mc.py --eval \ 
--combine_datasets <dataset> --combine_datasets_val <dataset> --save_dir=zs<dataset> \ 
--ds_factor_ff=8 --ds_factor_attn=8 --suffix="." \
--batch_size_val=32 --max_tokens=512 --load=<CKPT_PATH>

Baselines

CLIP baseline

Fully-supervised VideoQA

Fill-in-the-blank and open-ended VideoQA

To finetune the cross-modal trained FrozenBiLM on LSMDC-FiB, iVQA, MSRVTT-QA, MSVD-QA, ActivityNet-QA or TGIF-QA FrameQA, run:

python -m torch.distributed.launch --nproc_per_node 4 --use_env videoqa.py \
--combine_datasets <dataset> --combine_datasets_val <dataset> --save_dir=ft<dataset> \
--lr=5e-5 --schedule=linear_with_warmup --load=<CKPT_PATH> \
--ds_factor_ff=8 --ds_factor_attn=8 --suffix="." \
--batch_size=8 --batch_size_val=32 --max_tokens 256 --epochs=20

Pass --ft_lm --ft_mlm --ds_factor_ff=0 --ds_factor_attn=0 for the UnFrozenBiLM variant.

Multiple-choice VideoQA

To finetune the cross-modal trained FrozenBiLM on How2QA or TVQA, run:

python -m torch.distributed.launch --nproc_per_node 8 --use_env mc.py \
--combine_datasets <dataset> --combine_datasets_val <dataset> --save_dir=ft<dataset> \
--lr=5e-5 --schedule=linear_with_warmup --load=<CKPT_PATH> \
--ds_factor_ff=8 --ds_factor_attn=8 --suffix="." \
--batch_size=2 --batch_size_val=8 --max_tokens=256 --epochs=20 

Pass --ft_lm --ft_mlm --ds_factor_ff=0 --ds_factor_attn=0 --batch_size=1 for the UnFrozenBiLM variant.

Few-shot VideoQA

For few-shot VideoQA, we sample a subpart of the train dataframe file and change --<dataset>_train_csv_path.
The random subsets used in the paper are released here.

VideoQA Demo

Using a trained checkpoint, you can also run a VideoQA example with a video file of your choice, and the question of your choice. For that, use (the answer vocabulary is taken from msrvtt_vocab_path):

python demo_videoqa.py --combine_datasets msrvtt --combine_datasets_val msrvtt \
--suffix="." --max_tokens=256 --ds_factor_ff=8 --ds_factor_attn=8 \
--load=<CKPT_PATH> --msrvtt_vocab_path=<VOCAB_PATH> \
--question_example <question> --video_example <video_path>

This demo can run on CPUs, with at least 4 physical cores. For this, use --device='cpu'. Note that this demo does not use speech input which would require using an off-the-shelf ASR extractor.

Acknowledgements

The transformer models implementation is inspired by Hugging Face's transformers library.
The feature extraction code is inspired by Just Ask.

Licenses

This code is released under the Apache License 2.0.
The licenses for datasets used in the paper are available at the following links: iVQA, MSRVTT-QA, MSVD-QA, ActivityNet-QA, How2QA and TVQA.

Citation

If you found this work useful, consider giving this repository a star and citing our paper as followed:

@inproceedings{yang2022frozenbilm,
title = {Zero-Shot Video Question Answering via Frozen Bidirectional Language Models},
author = {Antoine Yang and Antoine Miech and Josef Sivic and Ivan Laptev and Cordelia Schmid},
booktitle={NeurIPS}
year = {2022}}