Therefore, the detection for SUs are useful, which capture salient local information, as shown in Figure 2.
to obtain the representations of candidate SUs, multiple windows with variable width over word embeddings are used to perform element-wise additive composition, as follows: where, Ewin ∈ R d×m is a window matrix with all weights equal to one, and is the jth column from the sub-matrix PM win,i , which is windowed on projected matrix PM by Ewin with the ith times sliding.