Interpolating Video-LLMs: Toward Longer-sequence LMMs in a Training-free Manner

• URL: http://arxiv.org/abs/2409.12963v2
• Date: Wed, 2 Oct 2024 01:56:08 GMT
• Title: Interpolating Video-LLMs: Toward Longer-sequence LMMs in a Training-free Manner
• Authors: Yuzhang Shang, Bingxin Xu, Weitai Kang, Mu Cai, Yuheng Li, Zehao Wen, Zhen Dong, Kurt Keutzer, Yong Jae Lee, Yan Yan,
• Abstract summary: Video-LLMs are pre-trained to process short videos, limiting their broader application for understanding longer video content. We introduce an alternative video token rearrangement technique that circumvents limitations imposed by the fixed video encoder and alignment projector.
• Score: 53.671484175063995
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Advancements in Large Language Models (LLMs) inspire various strategies for integrating video modalities. A key approach is Video-LLMs, which incorporate an optimizable interface linking sophisticated video encoders to LLMs. However, due to computation and data limitations, these Video-LLMs are typically pre-trained to process only short videos, limiting their broader application for understanding longer video content. Additionally, fine-tuning Video-LLMs to handle longer videos is cost-prohibitive. Consequently, it becomes essential to explore the interpolation of Video-LLMs under a completely training-free setting. In this paper, we first identify the primary challenges in interpolating Video-LLMs: (1) the video encoder and modality alignment projector are fixed, preventing the integration of additional frames into Video-LLMs, and (2) the LLM backbone is limited in its content length capabilities, which complicates the processing of an increased number of video tokens. To address these challenges, we propose a specific INTerPolation method for Video-LLMs (INTP-Video-LLMs). We introduce an alternative video token rearrangement technique that circumvents limitations imposed by the fixed video encoder and alignment projector. Furthermore, we introduce a training-free LLM context window extension method to enable Video-LLMs to understand a correspondingly increased number of visual tokens.

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