针对在海量数据中频繁项集挖掘耗时问题,近年来提出的N-List结构可有效提高挖掘效率。基于N-List提出一种新的频繁项集挖掘算法HNSFI(Hash table and subsume frequent itemsets mining based on N-List)。该算法利用PPC-tree生成N-List...针对在海量数据中频繁项集挖掘耗时问题,近年来提出的N-List结构可有效提高挖掘效率。基于N-List提出一种新的频繁项集挖掘算法HNSFI(Hash table and subsume frequent itemsets mining based on N-List)。该算法利用PPC-tree生成N-List,引入哈希表存储N-List表示的项集,加快N-List相交操作运算时间;引入包含因子概念,利用其性质通过组合方法可以直接生成部分频繁项集,进一步提高算法时间性能。在三种不同的数据集上对该算法进行了测试和分析,实验结果表明在稠密数据集中该算法的时间性能是最优的。展开更多
Medical gamasid mite is a general designation of a kind of non-insect arthropod and it can transmit many diseases.Dermanyssoidea is an important part of medical gamasid mite,so 126 new species in 9 genera have been ad...Medical gamasid mite is a general designation of a kind of non-insect arthropod and it can transmit many diseases.Dermanyssoidea is an important part of medical gamasid mite,so 126 new species in 9 genera have been added on the basis of Economic insect fauna of China and through combining many researches on Fauna of Gamasid Mites in China,so the research has enriched and extended the content of dermanyssoidea.展开更多
文摘针对在海量数据中频繁项集挖掘耗时问题,近年来提出的N-List结构可有效提高挖掘效率。基于N-List提出一种新的频繁项集挖掘算法HNSFI(Hash table and subsume frequent itemsets mining based on N-List)。该算法利用PPC-tree生成N-List,引入哈希表存储N-List表示的项集,加快N-List相交操作运算时间;引入包含因子概念,利用其性质通过组合方法可以直接生成部分频繁项集,进一步提高算法时间性能。在三种不同的数据集上对该算法进行了测试和分析,实验结果表明在稠密数据集中该算法的时间性能是最优的。
基金Supported by the National Natural Science Foundation of China(30760226)~~
文摘Medical gamasid mite is a general designation of a kind of non-insect arthropod and it can transmit many diseases.Dermanyssoidea is an important part of medical gamasid mite,so 126 new species in 9 genera have been added on the basis of Economic insect fauna of China and through combining many researches on Fauna of Gamasid Mites in China,so the research has enriched and extended the content of dermanyssoidea.