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https://issues.apache.org/jira/browse/SPARK-24666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16908267#comment-16908267
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holdenk commented on SPARK-24666:
---------------------------------

[~zhongyu09]specific code & data which leads to repro can help.

> Word2Vec generate infinity vectors when numIterations are large
> ---------------------------------------------------------------
>
>                 Key: SPARK-24666
>                 URL: https://issues.apache.org/jira/browse/SPARK-24666
>             Project: Spark
>          Issue Type: Bug
>          Components: ML, MLlib
>    Affects Versions: 2.3.1
>         Environment:  2.0.X, 2.1.X, 2.2.X, 2.3.X
>            Reporter: ZhongYu
>            Priority: Critical
>
> We found that Word2Vec generate large absolute value vectors when 
> numIterations are large, and if numIterations are large enough (>20), the 
> vector's value many be *infinity(or -**infinity)***, resulting in useless 
> vectors.
> In normal situations, vectors values are mainly around -1.0~1.0 when 
> numIterations = 1.
> The bug is shown on spark 2.0.X, 2.1.X, 2.2.X, 2.3.X.
> There are already issues report this bug: 
> https://issues.apache.org/jira/browse/SPARK-5261 , but the bug fix works 
> seems missing.
> Other people's reports:
> [https://stackoverflow.com/questions/49741956/infinity-vectors-in-spark-mllib-word2vec]
> [http://apache-spark-user-list.1001560.n3.nabble.com/word2vec-outputs-Infinity-Infinity-vectors-with-increasing-iterations-td29020.html]
>  
>  



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