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please consider the following code:

  #update
  W1 = W1 - learningRate * dJdW1
  W2 = W2 - learningRate * dJdW2

Where learningRate is double and dJdW1/dJdW1 2d matrices.

I'm getting this error:

ERROR: Runtime error in program block generated from statement block between lines 58 and 61 -- Error evaluating instruction: CP\xb0-*\xb0W2\xb7MATRIX\xb7DOUBLE\xb01.0E-5\xb7SCALAR\xb7DOUBLE\xb7true\xb0dJdW2\xb7MATRIX\xb7DOUBLE\xb0_mVar117\xb7MATRIX\xb7DOUBLE

EDIT 12.7.17:

plus this one...

ordinal not in range(128)'))

The whole DML can be found here

The complete Error can be found here

The whole jupyther notebook can be found here

Romeo Kienzler
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1 Answers1

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The cellwise scalar matrix operation is fine. Looking at your error, it says that your matrix/vector dimensions are not compatible:

 : Block sizes are not matched for binary cell operations: 3x1 vs 2x3
 org.apache.sysml.runtime.matrix.data.MatrixBlock.binaryOperations(MatrixBlock.java:2872)
 org.apache.sysml.runtime.instructions.cp.PlusMultCPInstruction.processInstruction(PlusMultCPInstruction.java:66)
 org.apache.sysml.runtime.controlprogram.ProgramBlock.executeSingleInstruction(ProgramBlock.java:290)

Looking at your Notebook, this comes from:

 W2 = W2 - learningRate * dJdW2

W2 is initialized W2 = rand(rows=hiddenLayerSize,cols=outputLayerSize) as a 3x1 matrix, while dJDW2 is a 2x3 matrix.

Berthold Reinwald
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  • had to change the return type from return (matrix[double] dJdW1,matrix[double] dJdW1) { to return (matrix[double] dJdW1,matrix[double] dJdW2) { – Romeo Kienzler Jul 13 '17 at 04:40