[jira] [Commented] (MAHOUT-1873) Use densityAnalysis() in all necessary operations

["Andrew Palumbo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-1873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15474144#comment-15474144 ] 

Andrew Palumbo commented on MAHOUT-1873:
----------------------------------------

Spark {{AtB}} is a candidate:

https://github.com/apache/mahout/blob/master/spark/src/main/scala/org/apache/mahout/sparkbindings/blas/ABt.scala#L296

Currently the accumulator in the combiner is a Default {{SparseRowMatrix}}.

> Use densityAnalysis() in all necessary operations
> -------------------------------------------------
>
>                 Key: MAHOUT-1873
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1873
>             Project: Mahout
>          Issue Type: Improvement
>    Affects Versions: 0.12.2
>            Reporter: Andrew Palumbo
>            Assignee: Andrew Palumbo
>             Fix For: 0.13.0
>
>
> Find all places in which {{densityAnalysis(...)}} can be used to determine ideal matrix structure and implement it.  Eg in {{ABt}}, {{AtB}}, and possibly Kryo serializers.  Ensure when doing this that it is not redundant; Ie. the call is not made by both the Kryo serializer and the distributed operation.



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