arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2508.05954cs.CVcs.AIcs.CL

Bifrost-1:利用 Patch 级 CLIP 潜变量连接多模态 LLM 与扩散模型

Bifrost-1: Bridging Multimodal LLMs and Diffusion Models with Patch-level CLIP Latents

UNC Chapel Hill(北卡罗来纳大学教堂山分校);Lambda

Han Lin, Jaemin Cho, Amir Zadeh, Chuan Li, Mohit Bansal

AI总结:

提出 Bifrost-1 框架,利用 patch 级 CLIP 潜变量连接预训练多模态 LLM 与扩散模型,通过轻量级 ControlNet 适配和视觉生成分支,在保留多模态推理能力的同时实现了高效的高保真可控图像生成。

摘要:

人们越来越关注将高保真视觉合成能力集成到大语言模型(LLMs)中,同时不损害其强大的推理能力。现有直接训练 LLMs 或连接 LLMs 与扩散模型的方法,通常因骨干 LLMs 在预训练期间未见过图像表示而导致训练成本高昂。我们提出了 Bifrost-1,这是一个统一框架,利用 patch 级 CLIP 图像嵌入作为潜变量,连接预训练多模态 LLMs(MLLMs)与扩散模型,该潜变量与 MLLM 的 CLIP 视觉编码器原生对齐。这些 patch 级图像嵌入通过对扩散模型的 ControlNet 进行轻量级适配而集成其中。为保留 MLLMs 原有的多模态推理能力,我们在预测 patch 级图像嵌入时,为 MLLM 配备了一个由原始 MLLM 参数初始化的视觉生成分支。通过利用 patch 级 CLIP 潜变量无缝集成预训练 MLLMs 与扩散模型,我们的框架实现了高保真可控图像生成,并具有显著的训练效率。实验表明,Bifrost-1 在视觉保真度和多模态理解方面取得了与以往方法相当或更好的性能,且训练期间计算量大幅降低。我们还提供了全面的消融研究,证明了设计选择的有效性。

英文摘要:

There is growing interest in integrating high-fidelity visual synthesis capabilities into large language models (LLMs) without compromising their strong reasoning capabilities. Existing methods that directly train LLMs or bridge LLMs and diffusion models usually suffer from costly training since the backbone LLMs have not seen image representations during pretraining. We present Bifrost-1, a unified framework that bridges pretrained multimodal LLMs (MLLMs) and diffusion models using patch-level CLIP image embeddings as latent variables, which are natively aligned with the MLLM's CLIP visual encoder. These patch-level image embeddings are integrated into the diffusion model with a lightweight adaptation of its ControlNet. To retain the original multimodal reasoning capabilities of MLLMs, we equip the MLLM with a visual generation branch initialized from the original MLLM parameters when predicting the patch-level image embeddings. By seamlessly integrating pretrained MLLMs and diffusion models with patch-level CLIP latents, our framework enables high-fidelity controllable image generation with significant training efficiency. Our experiments demonstrate that Bifrost-1 achieves comparable or better performance than previous methods in terms of visual fidelity and multimodal understanding, with substantially lower compute during training. We also provide comprehensive ablation studies showing the effectiveness of our design choices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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