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https://issues.apache.org/jira/browse/SYSTEMML-1077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Niketan Pansare resolved SYSTEMML-1077.
---------------------------------------
Resolution: Fixed
Fixed in the commit
https://github.com/apache/incubator-systemml/commit/e0e60a611190cd78f13cc9af83ebde1db2e9b8a1
> Max Pooling Null Pointer
> ------------------------
>
> Key: SYSTEMML-1077
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1077
> Project: SystemML
> Issue Type: Bug
> Affects Versions: SystemML 0.11
> Reporter: Mike Dusenberry
> Assignee: Niketan Pansare
> Priority: Blocker
> Fix For: SystemML 0.11
>
>
> Currently, if a matrix of all zeros is passed into `max_pool`, a null pointer
> exception will be raised. This is a possibility within the course of
> training a neural net that uses ReLU & Dropout layers.
> {code}
> script = """
> N = 2
> C = 3
> Hin = 10
> Win = 10
> f = 2
> stride = 2
> X = matrix(0, rows=N, cols=C*Hin*Win)
> out = max_pool(X, input_shape=[N,C,Hin,Win], pool_size=[f,f],
> stride=[stride,stride], padding=[0,0])
> """
> script = dml(script).output("out")
> out = ml.execute(script).get("out")
> out.toDF().collect()
> {code}
> {code}
> Caused by: org.apache.sysml.runtime.DMLRuntimeException: Error while
> executing multi-threaded MaxPooling_Forward
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixDNN.runParallelConvTask(LibMatrixDNN.java:889)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixDNN.runConvTask(LibMatrixDNN.java:849)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixDNN.maxpooling(LibMatrixDNN.java:733)
> at
> org.apache.sysml.runtime.instructions.cp.ConvolutionCPInstruction.processInstruction(ConvolutionCPInstruction.java:192)
> at
> org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:305)
> ... 17 more
> Caused by: java.util.concurrent.ExecutionException:
> java.lang.NullPointerException
> at java.util.concurrent.FutureTask.report(FutureTask.java:122)
> at java.util.concurrent.FutureTask.get(FutureTask.java:192)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixDNN.runParallelConvTask(LibMatrixDNN.java:883)
> ... 21 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixDNN.doPooling(LibMatrixDNN.java:756)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixDNN.access$000(LibMatrixDNN.java:41)
> at
> org.apache.sysml.runtime.matrix.data.LibMatrixDNN$ConvTask.call(LibMatrixDNN.java:912)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> ... 1 more
> {code}
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