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https://issues.apache.org/jira/browse/MAHOUT-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15200707#comment-15200707
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ASF GitHub Bot commented on MAHOUT-1799:
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Github user statguy commented on the pull request:
https://github.com/apache/mahout/pull/182#issuecomment-198145198
@pferrel you are asking why null rows should not give an error? For
example, when I find user-item recommendations, but not all users get
recommendations. I write the matrix to an intermediate file and read it back to
process it further to fill those null rows with some sort of average
recommendations. I could write a unit test for this too, but I would like get
an approval first.
> Read null row vectors from file in TextDelimeterReaderWriter driver
> -------------------------------------------------------------------
>
> Key: MAHOUT-1799
> URL: https://issues.apache.org/jira/browse/MAHOUT-1799
> Project: Mahout
> Issue Type: Improvement
> Components: spark
> Reporter: Jussi Jousimo
> Assignee: Pat Ferrel
> Priority: Minor
> Fix For: 1.0.0
>
>
> Since some row vectors in a sparse matrix can be null, Mahout writes them out
> to a file with the row label only. However, Mahout cannot read these files,
> but throws an exception when it encounters a label-only row.
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