The Research on Automatic Recognition of the Double Negation Structure
The double negation structure is a special structure of"expressing positive meaning through two nega-tions",in which the two negations have an important impact on the semantic analysis and emotional classification in natural language processing.Taking"--P==>P"as the prototype,this paper examines the"negation word+negation word"structures in modern Chinese,and divides them into 3 categories,25 sub-categories and 132 con-structions in total.Then this paper proposes three conditions for the establishment of the double negation structure,and a rule-based method to identify the double negation.The accuracy rate of recognition of the double negation structure is 98.80%,the recall rate is 98.90%,and the F1 value is 98.95%.The proposed method could identify 8 640 sentences with 99.20%true double negation structure from 96 281 sentences.