Aside from fact triples, external information is employed to improve KG embedding such as combining text (Riedel et al., 2013;Wang et al., 2014a;Zhao et al., 2015), entity type and relationship domain Chang et al., 2014), relation path (Lin et al., 2015a;Gu et al., 2015), and logical rules Rocktäschel et al., 2015).
to capture the temporal order of relations, we further define a temporal evolving matrix t ∈ R n×n to model relation evolution, where n is the dimension of relation embedding.