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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:13:57 UTC

[jira] [Resolved] (SPARK-10678) Specialize PrefixSpan for single-item patterns

     [ https://issues.apache.org/jira/browse/SPARK-10678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-10678.
----------------------------------
    Resolution: Incomplete

> Specialize PrefixSpan for single-item patterns
> ----------------------------------------------
>
>                 Key: SPARK-10678
>                 URL: https://issues.apache.org/jira/browse/SPARK-10678
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>    Affects Versions: 1.6.0
>            Reporter: Xiangrui Meng
>            Priority: Major
>              Labels: bulk-closed
>
> We assume the input itemsets are multi-item in PrefixSpan, e.g., (ab)(cd). In some use cases, all itemsets are single-item, e.g., abcd. In this case, our implementation has overhead remembering the boundaries between itemsets. We could detect it and put specialized implementation for this use case.



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