We address the problem of discovering 3D parts for objects in unseen categories. Being able to learn the geometry prior of parts and transfer this prior to unseen categories pose fundamental challenges on data-driven shape segmentation approaches. Formulated as a contextual bandit problem, we propose a learning-based agglomerative clustering framework which learns a grouping policy to progressively group small part proposals into bigger ones in a bottom-up fashion. At the core of our approach is to restrict the local context for extracting part-level features, which encourages the generalizability to unseen categories. On the large-scale fine-grained 3D part dataset, PartNet, we demonstrate that our method can transfer knowledge of parts learned from 3 training categories to 21 unseen testing categories without seeing any annotated samples. Quantitative comparisons against four shape segmentation baselines shows that our approach achieve the state-of-the-art performance.

本研究提出一种基于学习的聚合聚类框架，在提取局部上下文以促进泛化到未知类别的情况下，学习部件的几何先验知识，并在不看到任何注释样本的情况下将其应用到未见过的类别中，实现了对大规模细粒度3D零件数据集PartNet的有效分割。

学习分组：一种针对未见类别的底部向上的三维零件发现框架