Each type label y k ∈ Y is represented by a K-dimensional binary indicator vector y k ∈ {0, 1} K , where y k,k = 1, and 0 otherwise.
we aim to learn a mapping function from the mention's feature space to a lowdimensional vector space, i.e., Φ M (m i ) : and a mapping function from type label space to the same low-dimensional space, i.e., Φ Y (y k ) : In this work, we adopt linear maps, as similar to the mapping functions used in (Weston et al., 2011).