local co-occurrence

N-level Vector Space Model and query expansion method based on local co-occurrence information are implemented in the system to improve the recall and precision. The system has rapid response time and good expansibility.
设计并实现了一种网络信息检索系统,该系统采用了N层向量空间模型以更好地区分相关文档和不相关文档,使用基于局部共现的查询扩展方法对查询进行扩展,提高了系统的召回率和准确率,本系统还具有良好的可扩展性。