Research on Personalized Book Recommendation Based on Improved Similarity Calculation and Data Filling Collaborative Filtering Algorithm

Table 3

RMSE values of users with the same number of clusters and different neighbors before and after the improvement of the algorithm.

Number of clustered users	RMSE value of traditional collaborative filtering recommendation algorithm	RMSE value of improved collaborative filtering recommendation algorithm
100	5.801	5.082
100	5.878	5
100	6.02	5.378
100	6.282	5.846
100	6.483	5.841
100	6.426	5.568
100	6.474	6.414
100	6.466	5.898
100	6.252	5
100	6.119	4.966
Average	6.2201	5.4993