A Probabilistic Rating Prediction and Explanation Inference Model for Recommender Systems

摘要

Collaborative Filtering (CF) is a leading approach to build recommender systems which has gained considerable development and popularity.A predominant approach to CF is rating prediction recommender algorithm,aiming to predict a user's rating for those items which were not rated yet by the user.However,with the increasing number of items and users,thedata is sparse.It is difficult to detectlatent closely relation among the items or users for predicting the user behaviors.In this paper,we enhance the rating prediction approach leading to substantial improvement of prediction accuracy by categorizing according to the genres of movies.Then the probabilities that users are interested in the genres are computed to integrate the prediction of each genre cluster.A novel probabilistic approach based on the sentiment analysis of the user reviews is also proposed to give intuitional explanations of why an item is recommended.To test the novel recommendation approach,a new corpus of user reviews on movies obtained from the Internet Movies Database(IMDB) has been generated.Experimental results show that the proposed framework is effective and achieves a better prediction performance.