Multimodal Adaptation of CLIP for Few-Shot Action Recognition

• URL: http://arxiv.org/abs/2308.01532v1
• Date: Thu, 3 Aug 2023 04:17:25 GMT
• Title: Multimodal Adaptation of CLIP for Few-Shot Action Recognition
• Authors: Jiazheng Xing, Mengmeng Wang, Xiaojun Hou, Guang Dai, Jingdong Wang, Yong Liu
• Abstract summary: This paper proposes a novel method called Multimodal Adaptation of CLIP (MA-CLIP) to address these issues. adapters we design can combine information from video-text sources for task-orientedtemporal modeling. Our MA-CLIP is plug-and-play, which can be used in any different few-shot action recognition temporal alignment metric.
• Score: 42.88862774719768
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Applying large-scale pre-trained visual models like CLIP to few-shot action recognition tasks can benefit performance and efficiency. Utilizing the "pre-training, fine-tuning" paradigm makes it possible to avoid training a network from scratch, which can be time-consuming and resource-intensive. However, this method has two drawbacks. First, limited labeled samples for few-shot action recognition necessitate minimizing the number of tunable parameters to mitigate over-fitting, also leading to inadequate fine-tuning that increases resource consumption and may disrupt the generalized representation of models. Second, the video's extra-temporal dimension challenges few-shot recognition's effective temporal modeling, while pre-trained visual models are usually image models. This paper proposes a novel method called Multimodal Adaptation of CLIP (MA-CLIP) to address these issues. It adapts CLIP for few-shot action recognition by adding lightweight adapters, which can minimize the number of learnable parameters and enable the model to transfer across different tasks quickly. The adapters we design can combine information from video-text multimodal sources for task-oriented spatiotemporal modeling, which is fast, efficient, and has low training costs. Additionally, based on the attention mechanism, we design a text-guided prototype construction module that can fully utilize video-text information to enhance the representation of video prototypes. Our MA-CLIP is plug-and-play, which can be used in any different few-shot action recognition temporal alignment metric.

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