This paper discusses the effect of hubness in zero-shot learning, when ridge
regression is used to find a mapping between the example space to the label
space. Contrary to the existing approach, which attempts to find a mapping from
the example space to the label space, we show that mapping labels into the
example space is desirable to suppress the emergence of hubs in the subsequent
nearest neighbor search step. Assuming a simple data model, we prove that the
proposed approach indeed reduces hubness. This was verified empirically on the
tasks of bilingual lexicon extraction and image labeling: hubness was reduced
with both of these tasks and the accuracy was improved accordingly.

本文探讨了零样本学习中 hubness 的影响，当使用岭回归在例子空间和标签空间之间寻找映射关系时。我们提出了将标签映射到例子空间的方法，以抑制后续最近邻搜索步骤中的 hub 出现。在一个简单的数据模型下，我们证明了所提出的方法确实减少了 hubness。我们在双语词典提取和图像标注任务上经验证实际上降低了 hubness，并且精度相应地提高了。