Video understanding typically requires fine-tuning the large backbone when adapting to new domains. In this paper, we leverage the egocentric video foundation models (Ego-VFMs) based on video-language pre-training and propose a parameter-efficient adaptation for egocentric video tasks, namely Ego-VPA. It employs a local sparse approximation for each video frame/text feature using the basis prompts, and the selected basis prompts are used to synthesize video/text prompts. Since the basis prompts are shared across frames and modalities, it models context fusion and cross-modal transfer in an efficient fashion. Experiments show that Ego-VPA excels in lightweight adaptation (with only 0.84% learnable parameters), largely improving over baselines and reaching the performance of full fine-tuning.
@article{arxiv.2407.19520,
title = {Ego-VPA: Egocentric Video Understanding with Parameter-efficient Adaptation},
author = {Tz-Ying Wu and Kyle Min and Subarna Tripathi and Nuno Vasconcelos},
journal= {arXiv preprint arXiv:2407.19520},
year = {2025}
}