Style Transfer error

#### Issue Description

Please describe your issue, along with:
- expected behavior
Run until execution finished.

- encountered behavior
Error stops execution.

Stack Trace:
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:66)
Caused by: java.lang.RuntimeException: NativeOps::execPairwiseTransform both operands must have same data type; Expected: [DOUBLE]; Actual: [FLOAT]
at org.nd4j.nativeblas.Nd4jCuda$NativeOps.execPairwiseTransform(Native Method)
at org.nd4j.linalg.jcublas.ops.executioner.CudaExecutioner.invoke(CudaExecutioner.java:1420)
at org.nd4j.linalg.jcublas.ops.executioner.CudaExecutioner.exec(CudaExecutioner.java:635)
at org.nd4j.linalg.api.ndarray.BaseNDArray.addi(BaseNDArray.java:3818)
at org.nd4j.linalg.api.ndarray.BaseNDArray.addi(BaseNDArray.java:3788)
at org.deeplearning4j.examples.styletransfer.NeuralStyleTransfer.createCombinationImage(NeuralStyleTransfer.java:192)
at org.deeplearning4j.examples.styletransfer.NeuralStyleTransfer.transferStyle(NeuralStyleTransfer.java:132)
at org.deeplearning4j.examples.styletransfer.NeuralStyleTransfer.main(NeuralStyleTransfer.java:124)
... 5 more

#### Version Information

Please indicate relevant versions, including, if relevant:

* Deeplearning4j version
1.0.0beta4
* platform information (OS, etc)
Windows 10
* CUDA version, if used
10.1
* NVIDIA driver version, if in use
430.86

#### Contributing

If you'd like to help us fix the issue by contributing some code, but would
like guidance or help in doing so, please mention it!