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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2015/08/02 18:17:04 UTC

[jira] [Created] (SPARK-9540) Optimize PrefixSpan implementation

Xiangrui Meng created SPARK-9540:
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             Summary: 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


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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