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https://issues.apache.org/jira/browse/SYSTEMML-1774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16090590#comment-16090590
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Mike Dusenberry edited comment on SYSTEMML-1774 at 7/17/17 10:14 PM:
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[~Tenma] Can you include a script with the updated parfor loop that could be
used to replicate this issue, as well as the memory settings? Additionally,
can you include the runtime plan ({{ml.setExplain(True)}} in MLContext) for
each setup (local machine, Spark cluster)?
[~mboehm7] Can you please assist in fixing this issue? I suspect that we have
two issues here: (1) the sizes aren't being propagated to the rand op thus
causing as conservative Spark op to start with, and (2) a lack of a guard
against compiling Spark ops within a REMOTE_SPARK parfor op.
EDIT: Part of the issue may actually be due to the SPARK vs HYBRID_SPARK modes.
was (Author: mwdus...@us.ibm.com):
[~Tenma] Can you include a script with the updated parfor loop that could be
used to replicate this issue, as well as the memory settings? Additionally,
can you include the runtime plan ({{ml.setExplain(True)}} in MLContext) for
each setup (local machine, Spark cluster)?
[~mboehm7] Can you please assist in fixing this issue? I suspect that we have
two issues here: (1) the sizes aren't being propagated to the rand op thus
causing as conservative Spark op to start with, and (2) a lack of a guard
against compiling Spark ops within a REMOTE_SPARK parfor op.
> Improve Parfor parallelism for deep learning
> --------------------------------------------
>
> Key: SYSTEMML-1774
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1774
> Project: SystemML
> Issue Type: Improvement
> Components: Algorithms, Compiler, ParFor
> Affects Versions: SystemML 1.0
> Reporter: Fei Hu
> Labels: deeplearning
> Attachments: mnist_lenet_distrib_sgd.dml
>
>
> When running the [distributed MNIST LeNet example |
> https://github.com/apache/systemml/blob/master/scripts/nn/examples/mnist_lenet_distrib_sgd.dml],
> each mini-batch could ideally run in parallel without interaction. We try to
> force {{parfor (j in 1:parallel_batches)}} at line 137 of
> {{nn/examples/mnist_lenet_distrib_sgd.dml}} to be {{parfor (j in
> 1:parallel_batches, mode=REMOTE_SPARK, opt=CONSTRAINED)}} use
> {{REMOTE_SPARK}} mode, but got some errors about
> {{org.apache.sysml.runtime.DMLRuntimeException: Not supported: Instructions
> of type other than CP instructions}} using the mode {{SPARK}}, and the error
> {{java.lang.NullPointerException}} using the mode {{HYBRID_SPARK}}. More log
> information can be found at the following comments.
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