Commonly, these methods regard event detection as a wordwise classification task with one NIL class for tokens do not trigger any event.
a neural network automatically extracts high-level features and then feed them into a classifier to categorize words into their corresponding event sub- CT CR MT NIL CC BC 41.3 14.4 2.1 1.6 39.0 1.7 CT 8.5 42.7 4.7 2.6 40.6 0.9 CR 5.7 7.3 50.0 1.1 32.3 2.9 MT 3.0 7.7 6.1 28.7 51.3 3.2 types (or NIL).