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From "Xiangrui Meng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-8999) Support non-temporal sequence in PrefixSpan
Date Sat, 01 Aug 2015 08:57:05 GMT

     [ https://issues.apache.org/jira/browse/SPARK-8999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiangrui Meng updated SPARK-8999:
---------------------------------
    Assignee: Zhang JiaJin

> Support non-temporal sequence in PrefixSpan
> -------------------------------------------
>
>                 Key: SPARK-8999
>                 URL: https://issues.apache.org/jira/browse/SPARK-8999
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>    Affects Versions: 1.5.0
>            Reporter: Xiangrui Meng
>            Assignee: Zhang JiaJin
>            Priority: Critical
>             Fix For: 1.5.0
>
>
> In SPARK-6487, we assume that all items are ordered. However, we should support non-temporal
sequences in PrefixSpan. This should be done before 1.5 because it changes PrefixSpan APIs.
> We can use `Array[Array[Int]]` or follow SPMF to use `Array[Int]` and use -1 to mark
itemset boundaries. The latter is more efficient for storage. If we support generic item type,
we can use null.



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