2025_NIPS_Unlabeled Data Improves Fine-Grained Image Zero-shot Classification with Multimodal LLMs

文章核心总结与翻译

一、主要内容

该研究针对多模态大型语言模型(MLLMs)在细粒度图像零样本分类任务中表现不佳的问题(因难以捕捉区分相似子类的细微视觉特征),提出了一种名为AutoSEP的无监督提示学习框架。其核心思路是利用无标签数据迭代优化图像描述提示词,引导MLLMs生成能突出判别性特征的文本描述,再结合原始图像进行分类,全程仅需MLLMs的黑盒访问权限,无需任何训练或微调。

研究在8个细粒度分类任务(涵盖鸟类、蝴蝶、犬类、蔬菜等数据集子集)上验证了方法有效性,使用Gemini 1.5 Flash、GPT-4o、Qwen2-VL-72B-Instruct等模型进行实验,结果显示AutoSEP相比标准零样本分类平均提升13%准确率,相比最优基线方法平均提升3%,且在不同模型和任务中均表现稳定。

二、创新点

  1. 提出AutoSEP框架:首个在黑盒设置下利用无标签数据提升MLLMs细粒度图像零样本分类性能的自监督提示学习方法,无需标注数据和模型白盒访问权限。
  2. 实例级分类评分机制:设计基于实例级描述匹配的评分函数,通过让MLLM区分图像与其自身/其他图像的描述,量化提示词质量,避免依赖标签信息。
  3. 迭代式提示优化流程:通过"错误收集-反思-修改"的迭代机制,利用MLLM自身反馈不断优化描述生成提示词,引导模型关注细粒度判别特征,提升描述的准确性和独特性。
  4. 跨模型与任务的通用性:在多种主流MLLMs和不同类型细粒度数据集上均验证了有效性,证明框架的鲁棒性和泛化能力。

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