Generative event extraction method based on ontology guidance

A generative event extraction method based on ontology guidance, comprising the following steps:

• step 1:
• constructing an event ontology knowledge base based on a domain knowledge base and an event annotation framework;
• step 2:
• designing an event trigger word extraction template and an event argument extraction template for the generative event extraction;
• the event trigger word extraction template maps an input event text to a first input sequence of an event extraction model;
• and the event argument extraction template maps the input event text integrating an event ontology to a second input sequence of the event extraction model;
• step 3:
• designing a class label mapping function that handles a mapping of multi-word labels to event type or role type;
• step 4:
• for the input event text, extracting the event ontology corresponding to the input event from the event ontology knowledge base, and according to the input event text and the event ontology, constructing the first input sequence and the second input sequence according to the event trigger word extraction template and the event argument extraction template;
• and
• step 5:
• inputting the first input sequence and the second input sequence into the event extraction model, and predicting, by the event extraction model, the event type and the role type according to the class label mapping function and a processing mechanism thereof, and outputting an event trigger word span and an event argument span.