We explain the structure and function of each layer of NSEM in more details below: Input Layer (d, h): the input layer aims to represent the main body d and title h with distributed embedding ⃗ d and ⃗ h. Let the subscript pos denotes the relevant title h pos (positive example) and subscript neg denotes an irrelevant title h neg (negative example).
for news articles, we pay more attention to the key elements of events such as location l, person p , organization o and keywords w. an event is described by a quadruple ⟨l, p, o, w⟩.