CLASS-LABELED SPAN SEQUENCE IDENTIFYING APPARATUS, CLASS-LABELED SPAN SEQUENCE IDENTIFYING METHOD AND PROGRAM

A class-labeled span sequence identification apparatus includes a span generation unit that generates all spans generable from a unit sequence input, a calculation unit that calculates a probability that each of the spans belongs to an individual class of a plurality of predefined classes, and an identification unit that identifies, from among span sequences generable in accordance with the spans, a class-labeled span sequence having a maximum product of a plurality of the probabilities or a maximum sum of scores according to the plurality of the probabilities, and thereby, improves accuracy of a class segmentation position in the unit sequence.