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Posted to issues@spark.apache.org by "Debasish Das (JIRA)" <ji...@apache.org> on 2016/10/17 06:20:58 UTC
[jira] [Commented] (SPARK-4823) rowSimilarities
[ https://issues.apache.org/jira/browse/SPARK-4823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15581359#comment-15581359 ]
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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