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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2014/11/24 21:25:12 UTC

[jira] [Closed] (SPARK-3820) Specialize columnSimilarity() without any threshold

     [ https://issues.apache.org/jira/browse/SPARK-3820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiangrui Meng closed SPARK-3820.
--------------------------------
    Resolution: Won't Fix

> Specialize columnSimilarity() without any threshold
> ---------------------------------------------------
>
>                 Key: SPARK-3820
>                 URL: https://issues.apache.org/jira/browse/SPARK-3820
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Xiangrui Meng
>            Assignee: Reza Zadeh
>
> `RowMatrix.columnSimilarities` calls `RowMatrix.columnSimilarity(0.0)` to compute the exact cosine similarities. It still requires sampling, which is unnecessary for this case. We should have a specialized version for it, in order to have a fair comparison with DIMSUM.



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