音声対話に対する談話セグメントのタグ方式の検討

概要

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This report describes tagging of discourse seglnents for spoken dialogues. We carried out tagging experiments for dialogues of two tasks, meeting space reservation and route direction, using two versions of written instructions. The agreement of tags between the coders is quantitatively evaluated with reliability in terms of the kappa coefficient (K). The first version of written instructions uses a tagging scheme of discourse segments based on Grosz and Sidner's discourse structure model. The discourse segment is marked with the beginning and the ending points, and the structllre of discourse segments can be nesting. The coders reached K=0.63 on the existence of discourse segment tags, and K=0.45 on the tags with the nesting level. Major disagreements of the discourse segment tag were ending points of the segment and nesting structure. In the second version, the tagging scheme was renewed based on characteristics of dialogue, which are exchange structure and ambiguous ending of topic. The written instruction requires coders to mark boundaries of the discourse segments with topic break index (TBI). The coders reached K=0.65 ignoring the TBI's, K=0.56 on the tags with TBI, and K=0.63 on the boundaries with TBI=2.
社団法人人工知能学会の論文
1999-03-01