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https://issues.apache.org/jira/browse/SPARK-13355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15149685#comment-15149685
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Apache Spark commented on SPARK-13355:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/11226

> Replace GraphImpl.fromExistingRDDs by Graph
> -------------------------------------------
>
>                 Key: SPARK-13355
>                 URL: https://issues.apache.org/jira/browse/SPARK-13355
>             Project: Spark
>          Issue Type: Bug
>          Components: ML, MLlib
>    Affects Versions: 1.3.1, 1.4.1, 1.5.2, 1.6.0, 2.0.0
>            Reporter: Xiangrui Meng
>            Assignee: Xiangrui Meng
>
> `GraphImpl.fromExistingRDDs` expects preprocessed vertex RDD as input. We 
> call it in LDA without validating this requirement. So it might introduce 
> errors. Replacing it by `Gpaph.apply` would be safer and more proper because 
> it is a public API. 



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