NeuralStyleTransfer failed

[sjsdfg]

when i run this example NeuralStyleTransfer
i get an NPE.

1:24:31,059 INFO  ~ iteration  0
Exception in thread "main" java.lang.NullPointerException
	at org.deeplearning4j.nn.layers.convolution.ConvolutionLayer.backpropGradient(ConvolutionLayer.java:134)
	at org.deeplearning4j.examples.styletransfer.NeuralStyleTransfer.backPropagate(NeuralStyleTransfer.java:284)
	at org.deeplearning4j.examples.styletransfer.NeuralStyleTransfer.backPropagateStyles(NeuralStyleTransfer.java:159)
	at org.deeplearning4j.examples.styletransfer.NeuralStyleTransfer.transferStyle(NeuralStyleTransfer.java:131)
	at org.deeplearning4j.examples.styletransfer.NeuralStyleTransfer.main(NeuralStyleTransfer.java:108)
	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.application.AppMain.main(AppMain.java:147)

the exception is caused by 134 line in ConvolutionLayer.java:134
the content is int miniBatch = this.input.size(0);

what causes this? that value should be 1.

[RobAltena]

I have reproduced this error on 1.0.0-alpha.

[liweigu]

int miniBatch = input.size(0);
The 'input' is null there.

[liweigu]

I found a way to run this example:

1. Comment out the line:
   Map<String, INDArray> activationsCombMap = vgg16FineTune.feedForward(combination, true);
2. Add these codes instead:
   INDArray[] input = new INDArray[] { combination };
   boolean train = true;
   boolean clearInputs = false;
   Map<String, INDArray> activationsCombMap = vgg16FineTune.feedForward(input, train, clearInputs);

[RobAltena]

@liweigu Thank you for fixing the issue. Appreciated.

[sjsdfg]

that is magic. when i debug this program. after line 131, the inputs is still in vgg16FineTune.
how can i insert a picture to show that?

[sjsdfg]

http://static.zybuluo.com/ZzzJoe/jaej72978fpr7sunqrky9zon/QQ%E5%9B%BE%E7%89%8720180410091824.png the debug picture