Vamba

This repo contains model checkpoints for Vamba-Qwen2-VL-7B. Vamba is a hybrid Mamba-Transformer model that leverages cross-attention layers and Mamba-2 blocks for efficient hour-long video understanding.

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Vamba Model Architecture

The main computation overhead in the transformer-based LMMs comes from the quadratic complexity of the self-attention in the video tokens. To overcome this issue, we design a hybrid Mamba Transformer architecture to process text and video tokens differently. The key idea of our method is to split the expensive self-attention operation over the entire video and text token sequence into two more efficient components. Since video tokens typically dominate the sequence while text tokens remain few, we maintain the self-attention mechanism exclusively for the text tokens and eliminate it for the video tokens. Instead, we add cross-attention layers that use text tokens as queries and video tokens as keys and values. In the meantime, we propose employing Mamba blocks to effectively process the video tokens.

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