[ https://issues.apache.org/jira/browse/SPARK-8997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-8997: ----------------------------------- Assignee: Feynman Liang (was: Apache Spark) > Improve LocalPrefixSpan performance > ----------------------------------- > > Key: SPARK-8997 > URL: https://issues.apache.org/jira/browse/SPARK-8997 > Project: Spark > Issue Type: Improvement > Components: MLlib > Affects Versions: 1.5.0 > Reporter: Xiangrui Meng > Assignee: Feynman Liang > Original Estimate: 24h > Remaining Estimate: 24h > > We can improve the performance by: > 1. run should output Iterator instead of Array > 2. Local count shouldn't use groupBy, which creates too many arrays. We can > use PrimitiveKeyOpenHashMap > 3. We can use list to avoid materialize frequent sequences -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org