Event extraction method based on incremental knowledge equivalent entity discovery

The invention provides an event extraction method based on incremental knowledge equivalent entity discovery, which comprises the following steps of: 1, mining corpus features of a target text of an event to be extracted, defining an event representation framework of the target text, namely a corpus, and structurally representing event information; step 2, performing joint sequence labeling, and identifying entities and event trigger words in sentences of the target text at the same time; step 3, integrating the obtained entities and event trigger words, eliminating contradictions and ambiguity, and associating and merging event trigger words with the same meaning; 4, event extraction is conducted according to the number of the event trigger words, and event extraction based on incremental knowledge equivalent entity discovery is completed. According to the method, the mutual dependence relation between the entity and the event trigger word is fully considered, the complex event can be effectively extracted f