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Firstly, from the perspective of similarity computed by TOPSIS, a general three-way decisions model for UIS based on decision risk is presented and its shortcomings are analyzed. Then, a concept of optimal density difference is defined to establish the DDS3WD model for UIS by updating attributes. Finally, the related experiments show that DDS3WD is feasible and effective for dealing with UIS under the condition of given accepted number of objects.<\/jats:p>","DOI":"10.3233\/jifs-201527","type":"journal-article","created":{"date-parts":[[2021,4,9]],"date-time":"2021-04-09T12:13:47Z","timestamp":1617970427000},"page":"10633-10644","source":"Crossref","is-referenced-by-count":2,"title":["Data-driven sequential three-way decisions for unlabeled information system"],"prefix":"10.1177","volume":"40","author":[{"given":"Jie","family":"Yang","sequence":"first","affiliation":[{"name":"School of Physics and Electronic Science, Zunyi Normal University, Zunyi, China"},{"name":"Chongqing Key Laboratory of Computational Intelligence, Chongqing University of Posts and Telecommunications, Chongqing, China"},{"name":"National Pilot School of Software, Yunnan University, Kunming, China"}]},{"given":"Tian","family":"Luo","sequence":"additional","affiliation":[{"name":"School of Physics and Electronic Science, Zunyi Normal University, Zunyi, China"}]},{"given":"Fan","family":"Zhao","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Computational Intelligence, Chongqing University of Posts and Telecommunications, Chongqing, China"}]},{"given":"Shuai","family":"Li","sequence":"additional","affiliation":[{"name":"Chongqing Key Laboratory of Computational Intelligence, Chongqing University of Posts and Telecommunications, Chongqing, China"}]},{"given":"Xin","family":"Jin","sequence":"additional","affiliation":[{"name":"National Pilot School of Software, Yunnan University, Kunming, China"}]}],"member":"179","reference":[{"key":"10.3233\/JIFS-201527_ref2","doi-asserted-by":"crossref","first-page":"4573","DOI":"10.1126\/science.7134969","article-title":"Topological structure in visual 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