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From "Robin Anil (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1190) SequentialAccessSparseVector function assignment is very slow
Date Fri, 12 Apr 2013 17:00:18 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630317#comment-13630317
] 

Robin Anil commented on MAHOUT-1190:
------------------------------------

I dont see the edge of SeqSV against RandSV.
                
> SequentialAccessSparseVector function assignment is very slow
> -------------------------------------------------------------
>
>                 Key: MAHOUT-1190
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1190
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Dan Filimon
>
> Currently when calling .assign() on a SASV with another vector and a custom function,
it will iterate through it and assign every single entry while also referring it by index.
> This makes the process *hugely* expensive. (on a run of BallKMeans on the 20 newsgroups
data set, profiling reveals that 92% of the runtime was spent updating assigning the vectors).
> Here's a prototype patch:
> https://github.com/dfilimon/mahout/commit/63998d82bb750150a6ae09052dadf6c326c62d3d

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