ELIP: Efficient Language-image Pre-training With Fewer Vision Tokens

Guo Yangyang, Zhang Haoyu, Wong Yongkang, Nie Liqiang, Kankanhalli Mohan. Arxiv 2023

[Paper]    
Attention Mechanism Efficiency And Optimization Merging Model Architecture Multimodal Models Pruning RAG Training Techniques

Learning a versatile language-image model is computationally prohibitive under a limited computing budget. This paper delves into the efficient language-image pre-training, an area that has received relatively little attention despite its importance in reducing computational cost and footprint. To that end, we propose a vision token pruning and merging method ELIP, to remove less influential tokens based on the supervision of language outputs. Our method is designed with several strengths, such as being computation-efficient, memory-efficient, and trainable-parameter-free, and is distinguished from previous vision-only token pruning approaches by its alignment with task objectives. We implement this method in a progressively pruning manner using several sequential blocks. To evaluate its generalization performance, we apply ELIP to three commonly used language-image pre-training models and utilize public image-caption pairs with 4M images for pre-training. Our experiments demonstrate that with the removal of ~30\(%\) vision tokens across 12 ViT layers, ELIP maintains significantly comparable performance with baselines (\(\sim\)0.32 accuracy drop on average) over various downstream tasks including cross-modal retrieval, VQA, image captioning, etc. In addition, the spared GPU resources by our ELIP allow us to scale up with larger batch sizes, thereby accelerating model pre-training and even sometimes enhancing downstream model performance.

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