I. Introduction
Impressions of fonts enrich typographic designs, but they are subjective and often ambiguous. Fig. 1 shows three fonts and their impression labels from the MyFonts dataset [1]. The impression labels are attached by crowdsourcing; various font experts and non-experts freely attach the labels to each font. Moreover, the impression labels are open-vocabulary; there is no pre-defined list of impression labels. Consequently, impression labels attached are often incomplete. For example, abdominal-krunch in Fig. 1 could have the impression labels thick and bold. On the other hand, it is too optimistic to expect the complete impression labels, by considering the ambiguity in impressions. In other words, it is difficult to determine unanimously whether a certain font has a certain impression.