Task: Question Understanding
Input (English): Input of the model is the concatenation of word embedding and another embedding indicating whether this word is predicate: $ \mathbf {x}_t = [\mathbf {W}_{\text{emb}}(w_t), \mathbf {W}_{\text{mask}}(w_t = v)]. $ 
 Question: What's the input representation of OpenIE tuples into the model?
Output (English): Abstractive