CLIP has shown a remarkable zero-shot capability on a wide range of vision tasks. Previously, CLIP is only regarded as a powerful visual encoder. However, after being pre-trained by language supervision from a large amount of image-caption pairs, CLIP itself should also have acquired some few-shot abilities for vision-language tasks. In this work, we empirically show that CLIP can be a strong vision-language few-shot learner by leveraging the power of language. We first evaluate CLIP's zero-shot performance on a typical visual question answering task and demonstrate a zero-shot cross-modality transfer capability of CLIP on the visual entailment task. Then we propose a parameter-efficient fine-tuning strategy to boost the few-shot performance on the vqa task. We achieve competitive zero/few-shot results on the visual question answering and visual entailment tasks without introducing any additional pre-training procedure.

本文实证表明，CLIP通过利用语言的能力可以成为强大的视觉-语言少样本学习器。我们评估了CLIP在典型的视觉问答任务和视觉蕴含任务的零样本性能，并提出了一种参数有效的微调策略，以提高少样本性能，最终取得了有竞争力的零样本/few-shot结果。

CLIP 模型是少样本学习器：基于 VQA 和视觉蕴涵的实证研究