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

["Cyril de Vogelaere (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-10678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951040#comment-15951040 ] 

Cyril de Vogelaere commented on SPARK-10678:
--------------------------------------------

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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