Collaborative Filtering Algorithm Based on User Characteristic and Time Weight

Abstract

This paper proposes a collaborative filtering recommendation algorithm based on user characteristics and time weight which focuses on the data sparseness and cold start problems of collaborative filtering algorithms. First, digitize user's characteristics in the dataset and calculate the similarity degree of the user's feature, then weight the similarity calculation formula with the integration time function to obtain the comprehensive similarity so that a more accurate prediction score is obtained. The comparison experiments showed that the algorithm can reduce the sparseness of the data set effectively when the data is extremely sparse, and to some extent, it alleviates the cold start problem and improves the prediction accuracy of the recommendation algorithm.