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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/05/17 02:44:02 UTC

[jira] [Assigned] (SPARK-4823) rowSimilarities

     [ https://issues.apache.org/jira/browse/SPARK-4823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-4823:
-----------------------------------

    Assignee: Apache Spark

> rowSimilarities
> ---------------
>
>                 Key: SPARK-4823
>                 URL: https://issues.apache.org/jira/browse/SPARK-4823
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Reza Zadeh
>            Assignee: Apache Spark
>
> RowMatrix has a columnSimilarities method to find cosine similarities between columns.
> A rowSimilarities method would be useful to find similarities between rows.
> This is JIRA is to investigate which algorithms are suitable for such a method, better than brute-forcing it. Note that when there are many rows (> 10^6), it is unlikely that brute-force will be feasible, since the output will be of order 10^12.



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