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https://issues.apache.org/jira/browse/SPARK-23568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16383849#comment-16383849
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Apache Spark commented on SPARK-23568:
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User 'mgaido91' has created a pull request for this issue:
https://github.com/apache/spark/pull/20719
> Silhouette should get number of features from metadata if available
> -------------------------------------------------------------------
>
> Key: SPARK-23568
> URL: https://issues.apache.org/jira/browse/SPARK-23568
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 2.4.0
> Reporter: Marco Gaido
> Priority: Minor
>
> In Silhouette computation we need to know the number of features. This is
> done taking the first row and checking the size of the features vector.
> Despite it works fine, if the number of attributes is present in the metadata
> of the column, we can avoid the additional job which is generated by using
> `first`.
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