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https://issues.apache.org/jira/browse/SPARK-9540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiangrui Meng resolved SPARK-9540.
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Resolution: Fixed
Fix Version/s: 1.5.0
Issue resolved by pull request 7937
[https://github.com/apache/spark/pull/7937]
> Optimize PrefixSpan implementation
> ----------------------------------
>
> Key: SPARK-9540
> URL: https://issues.apache.org/jira/browse/SPARK-9540
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 1.5.0
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
> Priority: Critical
> Fix For: 1.5.0
>
>
> Current `PrefixSpan` implementation contains some major issues:
> 1. We should expand the prefix by one item at a time instead of by one
> itemset.
> 2. Some set operations should be changed to array operations, which should be
> more efficient.
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