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VALHALLA: Visual Hallucination for Machine Translation

[arXiv] [Project Page]

This repository contains code for CVPR'22 submission "VALHALLA: Visual Hallucination for Machine Translation".

If you use the codes and models from this repo, please cite our work. Thanks!

@inproceedings{li2022valhalla,
    title={{VALHALLA: Visual Hallucination for Machine Translation}},
    author={Li, Yi and Panda, Rameswar and Kim, Yoon and Chen, Chun-Fu (Richard) and Feris, Rogerio and Cox, David and Vasconcelos, Nuno},
    booktitle={The IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
    year={2022}
}

Get started

# Clone repository
git clone --recursive https://github.com/JerryYLi/valhalla-nmt.git

# Install prerequisites
conda env create -f environments/basic.yml  # basic environment for machine translation from pretrained hallucination models; or
conda env create -f environments/full.yml  # complete environment for training visual encoder, hallucination and translation from scratch
conda activate valhalla

# Build environment
pip install -e fairseq/
pip install -e taming-transformers/  # for training vqgan visual encoders
pip install -e DALLE-pytorch/  # for training hallucination transformers

Data

All datasets should be organized under data/ directory, while binarized translation datasets are created under data-bin/ by preparation scripts. Refer to data/README.md for detailed instructions.

Training

Stage 1: Discrete visual encoder

Pretrain VQGAN visual encoder using taming-transformers. We provide a modified version under taming-transformers/ directory containing all scripts and configs needed for Multi30K and WIT data.

cd taming-transformers/

# Multi30K
ln -s [FLICKR_ROOT] data/multi30k/images  
python main.py --base configs/multi30k/vqgan_c128_l6.yaml --train True --gpus 0,1,2,3

# WIT
ln -s [WIT_ROOT] data/wit/images
python main.py --base configs/wit/vqgan_c128_l6_[TASK].yaml --train True --gpus 0,1,2,3

cd ..

Stage 2: Hallucination transformer

Pretrain DALL-E hallucination transformer using DALLE-pytorch.

cd DALLE-pytorch/

# Multi30K
python train_dalle.py \
  --data_path ../data-bin/multi30k/[SRC]-[TGT]/ --src_lang [SRC] --tgt_lang [TGT] \
  --vqgan_model_path [VQGAN_CKP].ckpt --vqgan_config_path [VQGAN_CFG].yaml \
  --taming --depth 2 --truncate_captions \
  --vis_data flickr30k --vis_data_dir [FLICKR_ROOT] --text_seq_len 16 --save_name "multi30k_[SRC]_[TGT]"

# WIT
python train_dalle.py \
  --data_path ../data-bin/wit/[SRC]_[TGT]/ --src_lang [SRC] --tgt_lang [TGT] \
  --vqgan_model_path [VQGAN_CKP].ckpt --vqgan_config_path [VQGAN_CFG].yaml \
  --taming --depth 2 --truncate_captions \
  --vis_data wit --vis_data_dir [WIT_ROOT] --text_seq_len 32 --save_name "wit_[SRC]_[TGT]"

cd ..

Stage 3: Multimodal translation

Train VALHALLA model on top of visual encoders from stage 1 and hallucination models from stage 2.

# Multi30K
bash scripts/multi30k/train.sh -s [SRC] -t [TGT] -w [VIS_CKP] -x [VIS_CFG] -u [HAL_CKP]

# WIT
bash scripts/wit/train.sh -s [SRC] -t [TGT] -b [TOKENS] -w [VIS_CKP] -x [VIS_CFG] -u [HAL_CKP]
  • Additional options:
    • -a: Architecture (choose from vldtransformer/vldtransformer_small/vldtransformer_tiny)
    • -e: Consistency loss weight (default: 0.5)
    • -g: Hallucination loss weight (default: 0.5)

Testing

Evaluating VALHALLA models:

# Multi30K
bash scripts/multi30k/test.sh -s [SRC] -t [TGT]

# WIT
bash scripts/wit/test.sh -s [SRC] -t [TGT] -b [TOKENS]
  • Additional options:
    • -g: Multimodal inference, use ground-truth visual context from test images
    • -k: Average last K checkpoints

Pretrained Models

Pretrained models are available for download at Releases page.

Acknowledgements

This project is built on several open-source repositories/codebases, including: