Instead, we propose to summarize the target representation from contextual sentence vectors according to its span boundary, and use feed-forward neural networks to predict the sentiment polarity, as shown in Figure 3(b).
given a target span r, we calculate a summarized vector v using the attention mechanism (Bahdanau et al., 2014) over tokens in its corrsponding bound (s i , e j ), similar to  and He et al.