Syntactic piece: Idea, purpose and application to sentiment analysis

We have been proposed Syntactic Piece, an unit for shallow language processing. A piece consists of a pair of modifier and modificand, derived from syntactic structure, and two expressions which differ slightly but having the same meaning are represented as the same piece in this framework. In this paper we report (a) reconsideration of creation procedures of pieces in order to meet our requirement more properly, and (b) discussion of effectiveness of the piece through experiments. We first discuss and propose procedures to automatically obtain syntactic pieces from text. We then present evaluation results in which sentiment analysis is chosen as the application. We found that modification of creation procedure would improve the performance in both recall and precision.