clospan mining closed sequential patterns in large datasets. Previous sequential pattern mining algorithms mine the full set of frequent subsequences satisfying a minsup threshold in a sequence database. However, since a frequent long sequence contains a combinatorial number of frequent subsequences, such mining will generate an explosive number of frequent subsequences for long patterns, which is prohibitively expensive in both time and space. In this paper, we propose an alternative but equally powerful solution: instead of mining the complete set of frequent subsequences
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PrefixSpan CommonPrefix CloSpan
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PrefixSpan CommonPrefix CloSpan
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100
1000
10000
minimum support threshold
PrefixSpan CommonPrefix CloSpan
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length of sequence
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PrefixSpan CommonPrefix CloSpan
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10
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10
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100
1000
10000
minimum support threshold
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