ruiqiangfan created SPARK-21130:
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Summary: Fix batch gradient bug in SVDPlusPlus
Key: SPARK-21130
URL: https://issues.apache.org/jira/browse/SPARK-21130
Project: Spark
Issue Type: Bug
Components: GraphX
Affects Versions: 2.1.1
Reporter: ruiqiangfan
I think the mode of batch gradient in Graphx SVDPlusPlus is incorrect. The
changes of this pull request are as blow:
* Use the mean of batch gradient instead of the sum of batch gradient.
* When calculating the bias of each rating during iteration, the bias
shouldn't be limit in (minVal, maxVal).
* The method "calculateIterationRMSE" is added to show the iteration effect
clearly.
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