Debasish Das commented on SPARK-4823:

We use it in multiple usecases internally but did not get time to refactor the 
PR into 3 smaller PRs....I will update the PR to 2.0

> rowSimilarities
> ---------------
>                 Key: SPARK-4823
>                 URL: https://issues.apache.org/jira/browse/SPARK-4823
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Reza Zadeh
>         Attachments: MovieLensSimilarity Comparisons.pdf, 
> SparkMeetup2015-Experiments1.pdf, SparkMeetup2015-Experiments2.pdf
> 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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