As in the previous example, however, there are category nodes that are almost equally "attractive" (e.g., algorithm and technique), and, furthermore, the taxonomy induction algorithm can only select among the set of hypernyms extracted during the harvesting phase.
when no definition suggests that distance metric learning is a hyponym of machine learning algorithm, or of any other concept connected to machine learning algorithm, there is no way of grouping distance metric learning and belief network learning in the desired way.