译文
REF: 原文 Recommender Systems: Issues, Challenges, and Research Opportunities Shah Khusro, Zafar Ali and Irfan Ullah Abstract A recommender system is an Information Retrieval technology that improves access and proactively recommends relevant items to users by consider-ing the users’ explicitly mentioned preferences and objective behaviors. A recommender system is one of the major techniques that handle information overload problem of Information Retrieval by suggesting users with appropriate and relevant items. Today, several recommender systems have been developed for different domains however