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https://issues.apache.org/jira/browse/SYSTEMML-649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15256721#comment-15256721
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Deron Eriksson commented on SYSTEMML-649:
-----------------------------------------
Do scalar inputs via JMLC currently work? If I have this DML:
{code}
inMatrix = read("./tmp/inMatrix", rows=-1, cols=-1);
print('inMatrix: ' + nrow(inMatrix) + 'x' + ncol(inMatrix));
inScalar = read("./tmp/inScalar", data_type="scalar", value_type="int");
print('inScalar: ' + inScalar);
outMatrix = matrix("1 2 3 0", rows=2, cols=2);
print('outMatrix: ' + nrow(outMatrix) + 'x' + ncol(outMatrix));
write(outMatrix, "./tmp", format="text");
{code}
and I do this:
{code}
Connection conn = new Connection();
String dml = conn.readScript("scalar-test.dml");
PreparedScript script = conn.prepareScript(dml, new String[] { "inMatrix",
"inScalar" }, new String[] { "outMatrix" }, false);
double[][] inMatrix = matrix(2, 2, new double[] { 1, 2, 3, 4 });
int inScalar = 5;
script.setMatrix("inMatrix", inMatrix);
script.setScalar("inScalar", inScalar);
ResultVariables results = script.executeScript();
double[][] result = results.getMatrix("outMatrix");
{code}
I get:
{code}
Exception in thread "main" org.apache.sysml.runtime.DMLRuntimeException:
org.apache.sysml.runtime.DMLRuntimeException: ERROR: Runtime error in program
block generated from statement block between lines 1 and 9 -- Error evaluating
instruction: CP°read°_Var4·SCALAR·INT·false°./tmp/inScalar·SCALAR·STRING·true
at
org.apache.sysml.runtime.controlprogram.Program.execute(Program.java:152)
at
org.apache.sysml.api.jmlc.PreparedScript.executeScript(PreparedScript.java:390)
at org.apache.sysml.JMLCExampleScalar.main(JMLCExampleScalar.java:26)
Caused by: org.apache.sysml.runtime.DMLRuntimeException: ERROR: Runtime error
in program block generated from statement block between lines 1 and 9 -- Error
evaluating instruction:
CP°read°_Var4·SCALAR·INT·false°./tmp/inScalar·SCALAR·STRING·true
at
org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:333)
at
org.apache.sysml.runtime.controlprogram.ProgramBlock.executeInstructions(ProgramBlock.java:222)
at
org.apache.sysml.runtime.controlprogram.ProgramBlock.execute(ProgramBlock.java:166)
at
org.apache.sysml.runtime.controlprogram.Program.execute(Program.java:145)
... 2 more
Caused by: org.apache.sysml.runtime.DMLRuntimeException:
java.io.FileNotFoundException: File tmp/inScalar does not exist
{code}
The matrix input and output work fine.
> JMLC/MLContext support for scalar output variables
> --------------------------------------------------
>
> Key: SYSTEMML-649
> URL: https://issues.apache.org/jira/browse/SYSTEMML-649
> Project: SystemML
> Issue Type: Task
> Components: APIs
> Reporter: Matthias Boehm
> Assignee: Deron Eriksson
>
> Right now neither JMLC nor MLContext supports scalar output variables. This
> task aims to extend both APIs with the required primitives.
> The workaround is to cast any output scalar on script-level with as.matrix to
> a 1-1 matrix and handle it in the calling application. However, especially
> with MLContext this puts an unnecessary burden on the user as he needs to
> deal with RDDs for a simple scalar too.
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