We introduce a Japanese Morphology dataset, J-UniMorph, developed based on
the UniMorph feature schema. This dataset addresses the unique and rich verb
forms characteristic of the language's agglutinative nature. J-UniMorph
distinguishes itself from the existing Japanese subset of UniMorph, which is
automatically extracted from Wiktionary. On average, the Wiktionary Edition
features around 12 inflected forms for each word and is primarily dominated by
denominal verbs (i.e., [noun] +suru (do-PRS)). Morphologically, this form is
equivalent to the verb suru (do). In contrast, J-UniMorph explores a much
broader and more frequently used range of verb forms, offering 118 inflected
forms for each word on average. It includes honorifics, a range of politeness
levels, and other linguistic nuances, emphasizing the distinctive
characteristics of the Japanese language. This paper presents detailed
statistics and characteristics of J-UniMorph, comparing it with the Wiktionary
Edition. We release J-UniMorph and its interactive visualizer publicly
available, aiming to support cross-linguistic research and various
applications.

我们介绍了一个基于 UniMorph 特征结构的日语形态学数据集 J-UniMorph，该数据集解决了普遍存在于该语言中的具有凝结性特点的动词形式。相比于从维基词典自动提取的现有日语 UniMorph 子集，J-UniMorph 在每个词中提供了更广泛、更常用的 118 个屈折形式，包括敬语、不同的礼貌水平和其他语言细微差异，突出了日语的独特特点。本文详细介绍了 J-UniMorph 的统计数据和特征，并将其与维基词典版进行了比较。我们公开发布了 J-UniMorph 及其交互式可视化工具，旨在支持跨语言研究和各种应用。