RuntimeError: function KernelConv2DFunctionBackward,bug in KernelConv2D.py

[huicong zhang]

In class KernelConv2DFunction ,The number of return Variable arguments of backward() funtion is not equal to the number of input Variable arguments of forward() function.Maybe backward() funtion should change return grad_input, grad_kernel to return grad_input, grad_kernel,None.that's can fix it

[Shangchen Zhou]

You are right. I forgot to change backward() output when I transformed it into the static method. Thanks for your kind notice.