def symb_forward(self, symb_input):
        """ creates dummy forward conv and uses its gradient as backwards pass """
        """ This code is mostly taken from https://github.com/Newmu/dcgan_code/blob/master/lib/ops.py """
        img = gpu_contiguous(symb_input)
        kerns = gpu_contiguous(self.W.param)

        alloc_shape = (img.shape[0], kerns.shape[1]) + tuple(i*d for i,d in zip(img.shape[2:],self.stride))
        desc = dnn.GpuDnnConvDesc(border_mode=self.border, subsample=self.stride, conv_mode=self.mode)(gpu_alloc_empty(*alloc_shape).shape, kerns.shape)
        out = gpu_alloc_empty(*alloc_shape)
        grad = dnn.GpuDnnConv3dGradI if symb_input.ndim == 5 else dnn.GpuDnnConvGradI
        conv_output = grad()(kerns, img, out, desc)

        if self.b == None:
            d_shuffle = ('x', 0) + tuple('x') * (symb_input.ndim-2)
            conv_output += self.b.param.dimshuffle(*d_shuffle)

        return conv_output
dataset/ETHPy150Open lucasb-eyer/DeepFried2/DeepFried2/layers/BackwardsConvolutionCUDNN.py/BackwardsConvolutionCUDNN.symb_forward/operator `is not` -> `==`