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https://issues.apache.org/jira/browse/MAHOUT-772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suneel Marthi resolved MAHOUT-772.
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Resolution: Won't Fix
> Refactor Matrix/Vector implementation with linear operators
> -----------------------------------------------------------
>
> Key: MAHOUT-772
> URL: https://issues.apache.org/jira/browse/MAHOUT-772
> Project: Mahout
> Issue Type: Improvement
> Components: Math
> Affects Versions: 0.5
> Reporter: Jonathan Traupman
> Fix For: Backlog
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> As part of the implementation of MAHOUT-672, we refactored the various linear
> algebra classes to include a new superclass for matrices, the LinearOperator,
> which is more or less a matrix that implements various arithmetic operations
> but does not allow per-element or per-row/col access. Linear operators
> allowed us to implement things like diagonal offsets (e.g. ridge regression)
> and the "timesSquared" operation efficiently and generally, removing some
> special-case code in various algorithms.
> Since in its current state, this refactor isn't ready for inclusion, and
> because it's fairly separate for other stuff in MAHOUT-672, I'm pulling it
> out into its own issue.
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