[jira] [Commented] (MAHOUT-1750) Mahout DSL for Flink: Implement ABt

[ASF GitHub Bot (JIRA)]

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https://issues.apache.org/jira/browse/MAHOUT-1750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234224#comment-15234224
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ASF GitHub Bot commented on MAHOUT-1750:
----------------------------------------

Github user rmetzger commented on the pull request:

    https://github.com/apache/mahout/pull/215#issuecomment-208029189
  
    I think the problem is the `TransposedMatrixView` class.
    
    See :
    
![recursive-mahout](https://cloud.githubusercontent.com/assets/89049/14411877/13266a16-ff55-11e5-82ae-becb2f4f53af.png)
    
    And this code example
    
    ```scala
    def main(args: Array[String]) {
    
        val ser = new 
KryoSerializer[TransposedMatrixView](classOf[TransposedMatrixView], new 
ExecutionConfig())
        val matrix = new SparseMatrix(15, 15)
        val inst = new TransposedMatrixView(matrix)
        ser.serialize(inst, new DataOutputSerializer(64))
      }
    ```
    
    which will reproduce the error.


> Mahout DSL for Flink: Implement ABt
> -----------------------------------
>
>                 Key: MAHOUT-1750
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1750
>             Project: Mahout
>          Issue Type: Task
>          Components: Math
>    Affects Versions: 0.10.2
>            Reporter: Alexey Grigorev
>            Assignee: Andrew Palumbo
>            Priority: Minor
>             Fix For: 0.12.0
>
>
> Now ABt is expressed through AtB, which is not optimal, and we need to have a 
> special implementation for ABt



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