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From "Matthias Boehm (JIRA)" <>
Subject [jira] [Resolved] (SYSTEMML-1762) Improve the matrix reshape function for the Spark mode
Date Thu, 13 Jul 2017 08:12:00 GMT


Matthias Boehm resolved SYSTEMML-1762.
       Resolution: Fixed
    Fix Version/s: SystemML 1.0

> Improve the matrix reshape function for the Spark mode
> ------------------------------------------------------
>                 Key: SYSTEMML-1762
>                 URL:
>             Project: SystemML
>          Issue Type: Bug
>          Components: Algorithms, ParFor, Runtime
>            Reporter: Fei Hu
>            Assignee: Fei Hu
>             Fix For: SystemML 1.0
>         Attachments: MNIST_Distrib_Sgd.scala
> When running the [distributed MNIST LeNet example |],
it works well in the hybrid mode. But in the Spark mode, there are some errors about
> {{java.lang.NullPointerException}}  and {{java.lang.ArrayIndexOutOfBoundsException: 1000}}
when reshaping the matrix. The involved functions are {{}}
and {{}}. The reason is that
the output matrix index computed by {{}}
does not match the keys in the {{HashMap<MatrixIndexes,MatrixBlock> rix}}. 
> To reproduce the error, the attached scala file {{MNIST_Distrib_Sgd.scala}} could be
used to run the distributed MNIST example.  
> In addition, if adding some codes to ignore the null output matrix block from {{MatrixBlock
out = rix.get(ixtmp)}},  the distributed MNIST example could run in the Spark mode, but the
result may not be right. 

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