Off-topic English Essay Detection Model Based on Hybrid Semantic Space for Automated English Essay Scoring System
Aiming at the problem that the lack of accurate and efficient off-topic detection model for current Automated English Scoring System in China,an unsupervised off-topic essay detection model based on hybrid semantic space was proposed.Firstly,the essay and its essay prompt are respectively represented as noun phrases by using a neural-network dependency parser.Secondly,we introduce a method to construct a hybrid semantic space.Thirdly,we propose a method to represent the noun phrases of the essay and its prompt as vectors in hybrid semantic space and calculate the similarity between the essay and its prompt by using the noun phrase vectors of them.Finally,we propose a sort method to set the off-topic threshold so that the offtopic essays can be identified efficiently.The experimental results on four datasets totaling 5000 essays show that,compared to the previous off-topic essay detection models,the proposed model can detect off-topic essays with higher accuracy,and the accuracy rate over all essay data sets reaches 89.8%.
Guimin Huang Jian Liua Chunli Fan Tingting Pan
School of Information and Communication Engineering,Guilin University of Electronic Technology,Guilin,China
国际会议
上海
英文
1-5
2018-10-12（万方平台首次上网日期，不代表论文的发表时间）