[
https://issues.apache.org/jira/browse/SYSTEMML-1762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Fei Hu updated SYSTEMML-1762:
-----------------------------
Description:
When running the [distributed MNIST LeNet example |
https://github.com/apache/systemml/blob/master/scripts/nn/examples/mnist_lenet_distrib_sgd.dml],
there is a
{code:java}
java.lang.NullPointerException
{code}
error when reshaping the sparse matrix. The involved function is
`org.apache.sysml.runtime.matrix.data.LibMatrixReorg#reshapeSparse(org.apache.sysml.runtime.matrix.data.MatrixBlock,
long, long,
java.util.HashMap<org.apache.sysml.runtime.matrix.data.MatrixIndexes,org.apache.sysml.runtime.matrix.data.MatrixBlock>,
long, long, long, long, int, int, boolean)` . The reason is that the output
matrixIndex computed by
`org.apache.sysml.runtime.matrix.data.LibMatrixReorg#computeResultBlockIndex`
does not exist in the `HashMap<MatrixIndexes,MatrixBlock> rix`.
To reproduce the error, the attached scala file `MNIST_Distrib_Sgd` could be
used to run the distributed MNIST example.
was:
When running the [distributed MNIST LeNet example |
https://github.com/apache/systemml/blob/master/scripts/nn/examples/mnist_lenet_distrib_sgd.dml],
there is a `java.lang.NullPointerException` error when reshaping the sparse
matrix. The involved function is
`org.apache.sysml.runtime.matrix.data.LibMatrixReorg#reshapeSparse(org.apache.sysml.runtime.matrix.data.MatrixBlock,
long, long,
java.util.HashMap<org.apache.sysml.runtime.matrix.data.MatrixIndexes,org.apache.sysml.runtime.matrix.data.MatrixBlock>,
long, long, long, long, int, int, boolean)` . The reason is that the output
matrixIndex computed by
`org.apache.sysml.runtime.matrix.data.LibMatrixReorg#computeResultBlockIndex`
does not exist in the `HashMap<MatrixIndexes,MatrixBlock> rix`.
To reproduce the error, the attached scala file `MNIST_Distrib_Sgd` could be
used to run the distributed MNIST example.
> Improve the robustness of sparse matrix reshape function for the Spark mode
> ---------------------------------------------------------------------------
>
> Key: SYSTEMML-1762
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1762
> Project: SystemML
> Issue Type: Bug
> Components: Algorithms, ParFor, Runtime
> Reporter: Fei Hu
> Attachments: MNIST_Distrib_Sgd.scala
>
>
> When running the [distributed MNIST LeNet example |
> https://github.com/apache/systemml/blob/master/scripts/nn/examples/mnist_lenet_distrib_sgd.dml],
> there is a
> {code:java}
> java.lang.NullPointerException
> {code}
> error when reshaping the sparse matrix. The involved function is
> `org.apache.sysml.runtime.matrix.data.LibMatrixReorg#reshapeSparse(org.apache.sysml.runtime.matrix.data.MatrixBlock,
> long, long,
> java.util.HashMap<org.apache.sysml.runtime.matrix.data.MatrixIndexes,org.apache.sysml.runtime.matrix.data.MatrixBlock>,
> long, long, long, long, int, int, boolean)` . The reason is that the output
> matrixIndex computed by
> `org.apache.sysml.runtime.matrix.data.LibMatrixReorg#computeResultBlockIndex`
> does not exist in the `HashMap<MatrixIndexes,MatrixBlock> rix`.
> To reproduce the error, the attached scala file `MNIST_Distrib_Sgd` could be
> used to run the distributed MNIST example.
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