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https://issues.apache.org/jira/browse/SPARK-10678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951040#comment-15951040
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Cyril de Vogelaere commented on SPARK-10678:
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I hadn't seen this issue as I created mine.
I have finished an implementation which specialise Prefix-span for single-item
patterns, using a CP solver.
Here is the link the the issue I created, which proposes other improvement
along side this particular one.
https://issues.apache.org/jira/browse/SPARK-20179
Any advice you have for me would be welcome, since I'm a newbie at contributing
to Spark
> 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
>
> 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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