The Yuntech System in NTCIR-9 RITE Task

NTCIR-9 RITE task evaluates systems which automatically detect entailment, paraphrase, and contradiction in texts. The Yuntech team developed a preliminary system for the NTCIR-9 RITE task and was described in this paper. The major aim of this system was to determine the type of the relation of two sentences. A straightforward assumption was proposed for achieving this aim: the relation between two sentences was determined by the different parts between them instead of the identical parts. Therefore, we considered features including sentence lengths, the content of matched keywords, quantities of matched keywords, and their parts of speech to capture the difference between two sentences. Rule-based methods were implemented to develop the system according to the proposed assumption, and good performances were achieved for some types.