On Horizontal and Vertical Separation in Hierarchical Text Classification
Mostafa Dehghani, Hosein Azarbonyad, Jaap Kamps, Maarten Marx · 2016
Hierarchy is an effective and common way of organizing data and representing their relationships at different levels of abstraction. However, hierarchical data dependencies cause difficulties in the estimation of "separable" models that can distinguish between the entities in the hierarchy. Extracting separable models of hierarchical entities requires us to take their relative position into account and to consider the different types of dependencies in the hierarchy. In this paper, we present an investigation of the effect of separability in text-based entity classification and argue that in hierarchical classification, a separation property should be established between entities not only in the same layer, but also in different layers.