This contrasts with most other applications of LSTM encoders (for example, in syntactic parsing (Kiperwasser and Goldberg, 2016;Cross and Huang, 2016) or machine translation (Sutskever et al., 2014)), where sentences are typically encoded once and then used to predict the entire structured output (e.g., a syntactic tree or a target sentence).
when identifying arguments of a given predicate, we add a predicatespecific feature to the representation of each word in the sentence by concatenating a binary flag to the word representation of Section 2.1.