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From "Xiangrui Meng (JIRA)" <>
Subject [jira] [Created] (SPARK-9540) Optimize PrefixSpan implementation
Date Sun, 02 Aug 2015 16:17:04 GMT
Xiangrui Meng created SPARK-9540:

             Summary: Optimize PrefixSpan implementation
                 Key: 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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