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https://issues.apache.org/jira/browse/SYSTEMML-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15623148#comment-15623148
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Mike Dusenberry commented on SYSTEMML-1076:
-------------------------------------------

cc [~niketanpansare]

> Sparse Max Pooling Unsupported
> ------------------------------
>
>                 Key: SYSTEMML-1076
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1076
>             Project: SystemML
>          Issue Type: Bug
>            Reporter: Mike Dusenberry
>
> Currently, our max pooling built-in operator does not support sparse 
> matrices.  However, sparse matrices are a common possibility in neural nets 
> that make use of ReLU and Dropout layers.  Therefore, we should accept sparse 
> matrices as input.
> {code}
> Caused by: org.apache.sysml.runtime.DMLRuntimeException: Sparse 
> maxpooling_backward is not supported
>       at 
> org.apache.sysml.runtime.matrix.data.LibMatrixDNN.maxpooling_backward(LibMatrixDNN.java:526)
>       at 
> org.apache.sysml.runtime.instructions.cp.ConvolutionCPInstruction.processInstruction(ConvolutionCPInstruction.java:205)
>       at 
> org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:305)
>       ... 26 more
> {code}



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