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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