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.
設計并實現了一種網絡信息檢索系統(tǒng),該系統(tǒng)采用了N層向量空間模型以更好地區(qū)分相關文檔和不相關文檔,使用基于局部共現的查詢擴展方法對查詢進行擴展,提高了系統(tǒng)的召回率和準確率,本系統(tǒng)還具有良好的可擴展性。