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https://issues.apache.org/jira/browse/SPARK-1969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiangrui Meng resolved SPARK-1969.
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Resolution: Done
Fix Version/s: 1.1.0
PR: https://github.com/apache/spark/pull/955
> Public available online summarizer for mean, variance, min, and max
> -------------------------------------------------------------------
>
> Key: SPARK-1969
> URL: https://issues.apache.org/jira/browse/SPARK-1969
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: DB Tsai
> Assignee: DB Tsai
> Fix For: 1.1.0
>
>
> It basically moved the private ColumnStatisticsAggregator class from
> RowMatrix to public available DeveloperApi.
> Changes:
> 1) Moved the trait from
> org.apache.spark.mllib.stat.MultivariateStatisticalSummary to
> org.apache.spark.mllib.stats.Summarizer
> 2) Moved the private implementation from org.apache.spark.mllib.linalg.
> ColumnStatisticsAggregator to org.apache.spark.mllib.stats.OnlineSummarizer
> 3) When creating OnlineSummarizer object, the number of columns is not needed
> in the constructor. It's determined when users add the first sample.
> 4) Added the API documentation for OnlineSummarizer
> 5) Added the unittest for OnlineSummarizer
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