Effectiveness Evaluation for Paraphrase Method of Chinese Double Negation Based on Templates

By demand of expression, a double negation sentences are used in many situations. According to characteristics of double negation sentences, a paraphrase method based on templates is used. The method analysis sentence structure of double negation sentences, extract syntax frame and construct paraphrase templates. The syntax structure of double negative sentence and affirmation sentence are suitable for paraphrase. By comparing the syntax structure of double negative sentences with their affirmation sentences, paraphrase templates are abstracted. Matching of paraphrase templates with paraphrase sentences is completed by calculating their similarity. To evaluate performance of the method, small-scale experiments have been done and got the coverage rate of templates and precision of paraphrase 98.9% and 84.7% respectively. The experimental results indicate the availability of the proposed method, and a small corpus resource is established that it can be provided for further research of sentence paraphrase.