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https://issues.apache.org/jira/browse/SPARK-21104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16050172#comment-16050172
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Sean Owen commented on SPARK-21104:
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Doesn't the format dictate that it's sorted already?
> Support sort with index when parse LibSVM Record
> ------------------------------------------------
>
> Key: SPARK-21104
> URL: https://issues.apache.org/jira/browse/SPARK-21104
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 2.1.1
> Reporter: darion yaphet
> Priority: Minor
>
> When I'm loading LibSVM from HDFS , I found feature index should be in
> ascending order .
> We can sorted with *indices* when we parse the input line input a (index,
> value) tuple and avoid check if indices are in ascending order after that.
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