Fei Hu created SYSTEMML-1762:
--------------------------------
Summary: 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 `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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
