Computer Science ›› 2020, Vol. 47 ›› Issue (2): 31-36.doi: 10.11896/jsjkx.190500130

• Database & Big Data & Data Science • Previous Articles     Next Articles

New Similarity Measure Based on Extremely Rating Behavior

FENG Chen-jiao1,2,LIANG Ji-ye1,SONG Peng3,WANG Zhi-qiang1   

  1. (Key Laboratory of Computation Intelligence & Chinese Information Processing (Shanxi University),Ministry of Education,Taiyuan 030006,China)1;
    (College of Applied Mathematics,Shanxi University of Finance and Economics,Taiyuan 030006,China)2;
    (School of Economics and Management,Shanxi University,Taiyuan 030006,China)3
  • Received:2019-05-23 Online:2020-02-15 Published:2020-03-18
  • About author:FENG Chen-jiao,born in 1977,doctorial student,lecturer,is member of China Computer Federation.Her main research interests include data mining,big data correlation analysis and recommender systems;LIANG Ji-ye,born in 1962,Ph.D,professor,Ph.D supervisor,is member of China Computer Federation.His main research interests include granular computing,data mining and machine learning.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (61876103), Projects of Key Research and Development Plan of Shanxi Province (201603D111014), Research Project Supported by Shanxi Scholarship Council of China (2017-005) and 1331 Engineering Project of Shanxi Province, China.

Abstract: With the rapid development of Internet technology,drastic Internet information explosion makes information overload as an increasingly serious problem.Faced with the massive Internet information,users consume a lot of time to search for information or products,but the search solution is constrained.The recommender systems is hence proposed to address the problem of information overload.The recommender systems use users’ historical behaviors to speculate their needs,interests,etc.,and recommend the information and products users may be interested in.As an important type of recommendation approach,the memory-based collaborative filtering methods establish the rating prediction function based on neighbor information of the user or pro-duct.The essence of the function is to precisely measure the similarity between users or products.The traditional similarity mea-sures such as Pearson,Cosin and Spearman rank correlation coefficients,only take into account the linear relationship between users,while the heuristic similarities,such as the PIP measurement based on three special factors and its improved version,only depict the non-liner relationship between users.Indeed,in the recommender systems,it is neither the linear relation nor the non-linear relation is good for measuring the similarity between users.In order to describe the similarity among users more finely,this paper proposed a similarity measure index of the correlation level considering the extreme rating behaviors based on anonli-near function.By integrating this index with the traditional linear correlation coefficients,this paper constructed a novel similarity measure.Comparative experiments were conducted to test the practicability and validity of the proposed approach on Ml (100k) and Ml-latest-small datasets.The results demonstrate that the proposed method performs better judged by indicators of MAE and RMSE.

Key words: Recommender systems, Collaborative filtering, Memory-based collaborative filtering, Extremely rating behavior, Similarity

CLC Number: 

  • TP182
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