IBM Team at NTCIR-10 RITE2: Textual Entailment Using Temporal Dimension Reduction.
Masaki Ohno, Yuta Tsuboi, Hiroshi Kanayama, Katsumasa Yoshikawa · 2013
Our system for the Japanese BC/EXAM subtasks in NTCIR-10 RITE2 is an extension of our previous system for NTCIR-9 RITE. The new techniques are (1) Case-aware noun phrase matching using ontologies: The motivation of the feature is to capture finer syntactic structures than simple word matching. We uses ontologies to allow flexible matching of noun phrases. (2) Temporal expression matching after mapping historical entities to specific time intervals: The motivation of historical entity mapping is to expand the ca-pabilities of the temporal expression matching. From the experimental results, we found that the coverage is more important than the accuracy in the temporal entity map-ping. The scores of the formal runs were 74.9 % (accuracy in BC) and 64.5 % (accuracy in EXAM), which outperformed the baselines provided by the organizer.