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https://issues.apache.org/jira/browse/SPARK-4844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14246738#comment-14246738
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Guoqiang Li commented on SPARK-4844:
------------------------------------
The main reason is that {{RDD.sample}} is not efficient. {{RDD.sample}} loads
all data into memory.
See https://github.com/witgo/spark/compare/SPARK-4844
> SGD should support custom sampling.
> -----------------------------------
>
> Key: SPARK-4844
> URL: https://issues.apache.org/jira/browse/SPARK-4844
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Guoqiang Li
> Fix For: 1.3.0
>
>
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