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https://issues.apache.org/jira/browse/MAHOUT-1866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on MAHOUT-1866 started by Suneel Marthi.
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> Add matrix-to-tsv string function
> ---------------------------------
>
> Key: MAHOUT-1866
> URL: https://issues.apache.org/jira/browse/MAHOUT-1866
> Project: Mahout
> Issue Type: Sub-task
> Reporter: Trevor Grant
> Assignee: Suneel Marthi
> Fix For: 0.13.0
>
>
> Need a function to convert a matrix to a tsv string which can then be plotted
> by
> - Zeppelin %table visualization packages
> - Passed to R / Python via Zeppelin Resource Manager
> It has been noted that a matrix can be registered as an RDD and passed across
> contexts directly in Spark, however this breaks the 'backend agnoistic'
> philosophy. Until H20 and Flink also both support Python / R environments it
> is more reasonable to use tab-seperated-value strings.
> Further, matrices might be extremely large and unfit for being directly
> converted to tsvs. It may be wise to introduce some sort of safety valve for
> preventing excessively large matrices from being materialized into local
> memory (eg. supposing the user hasn't called their own sampling method on a
> matrix).
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