Recent success of Contrastive Language-Image Pre-training~(CLIP) has shown great promise in pixel-level open-vocabulary learning tasks. A general paradigm utilizes CLIP's text and patch embeddings to generate semantic masks. However, existing models easily misidentify input pixels from unseen classes, thus confusing novel classes with semantically-similar ones. In our work, we disentangle the ill-posed optimization problem into two parallel processes: one performs semantic matching individually, and the other judges reliability for improving discrimination ability. Motivated by special tokens in language modeling that represents sentence-level embeddings, we design a trusty token that decouples the known and novel category prediction tendency. With almost no extra overhead, we upgrade the pixel-level generalization capacity of existing models effectively. Our TagCLIP (CLIP adapting with Trusty-guidance) boosts the IoU of unseen classes by 7.4% and 1.7% on PASCAL VOC 2012 and COCO-Stuff 164K.

本研究针对 CLIP 在像素级开放词汇学习任务中面临的输入像素误识别问题，提出了一种名为 TagCLIP 的改进方法，通过引入一种名为 trusty token 的可信标记，成功提高了现有模型的泛化容量。针对 PASCAL VOC 2012 和 COCO-Stuff 164K 两大数据集，TagCLIP 对于未知分类的 IOU 值均有显著提升。

TagCLIP：提高开放式语料库语义分割的区分能力