Improving Prediction Accuracy Using Entropy Weighting in Collaborative Filtering

In this paper, we evaluate performance of existing similarity measurement metric and propose a novel method using user´s preferences information entropy to reduce MAE in memory-based collaborative recommender systems. The proposed method applies a similarity of individual inclination to traditional similarity measurement methods. We experiment on various similarity metrics under different conditions,which include an amount of data and significance weighting from n/10 to n/60, to verify the proposed method. As a result, we confirm the proposed method is robust and efficient from the viewpoint of a sparse data set, applying existing various similarity measurement methods and significance weighting.