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https://issues.apache.org/jira/browse/MAHOUT-456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895840#action_12895840
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Sebastian Schelter commented on MAHOUT-456:
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{quote}
Would it not be better to fix that inner loop of AbstractVector.assign(), to
zero out
the current values, followed by using iterateNonZero() on the argument?
-jake
{quote}
Added an optimized assign(Vector) method to SequentialAccessSparseVector
instead of changing the output of the RowSimilarityJob.
> RowSimilarityJob should not produce SequentialAccessSparseVectors
> -----------------------------------------------------------------
>
> Key: MAHOUT-456
> URL: https://issues.apache.org/jira/browse/MAHOUT-456
> Project: Mahout
> Issue Type: Improvement
> Components: Math
> Reporter: Sebastian Schelter
> Attachments: MAHOUT-456-2.patch, MAHOUT-456.patch
>
>
> RowSimilarityJob currently produces SequentialAccessSparseVectors with
> cardinality Integer.MAX_VALUE wrapped inside VectorWritables.
> It should better produce RandomAccessSparseVectors as some methods like
> assign(Vector) are very slow on such SequentialAccessSparseVectors.
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