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Posted to issues@spark.apache.org by "Marco Gaido (JIRA)" <ji...@apache.org> on 2018/03/02 17:09:00 UTC

[jira] [Created] (SPARK-23568) Silhouette should get number of features from metadata if available

Marco Gaido created SPARK-23568:
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             Summary: 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


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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