8: Here, (y 1 , ..., y T ) is the corresponding label sequence for the input sequence (p 1 , ..., p t−1 ), and the class distribution p(y t |c, y 1 , ..., .y t−1 ) is represented by a softmax function.
at each step, our approach uses the pre-trained word embeddings to encode the sentences of Qa pair, which then is used as the input vectors of the model.